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Storm Peak Lab


SPL Research



SPL Education and Outreach



Gannet Hallar, Ph.D.
Lab Director



P.O. Box 882530
Steamboat Springs, CO 80488


Publications by Year


Svenhag, C., Sporre, M.K., Olenius, T., Yazgi, D., Blichner, S.M., Nieradzik, L.P. and Roldin, P., 2024.
Implementing detailed nucleation predictions in the Earth system model EC-Earth3. 3.4:
sulfuric acid-ammonia nucleation. EGUsphere2024, pp.1-28.
DeMott, Paul J. Jessica A. Mirrielees, Sarah Suda Petters, Daniel J. Cziczo, Markus D. Petters,
Heinz G. Bingemer, Thomas C. J.  Hill, Karl Froyd, Sarvesh Garimella, A. Gannet Hallar, Ezra J.T. Levin,
Ian B. McCubbin, Anne  E. Perring, Jann Schrod, Thea Schiebel, Kaitlyn J. Suski, Daniel Weber,
Martin J. Wolfe, Maria Zawadowicz, Jake Zenker, Ottmar Möhler and Sarah D. Brooks; The Fifth
International Workshop on Ice Nucleation Phase 3 (FIN-03): Field Intercomparison of Ice Nucleation
Measurements, Atmospheric Measurement Techniques, submitted 2024.
Elgiar, Tyler R., Seth N. Lyman, Trevor O’Neil, Lynne Gratz, Sreekanth Vijayakumaran Nair, Igor Živković,
Milena Horvat, Teodor D. Andron, A. Gannet Hallar, NIST-Traceable Calibration of Atmospheric Oxidized
Mercury Measurements; ES&T, submitted 2024. 
Lee, C. F., Eligar, T., David, L. M., Wilmot, T. Y., Reza, M., Hirshorn, N., ... & Volkamer, R. (2024). Elevated
Tropospheric Iodine over the Central Continental United States: Is Iodine a Major Oxidant of
Atmospheric Mercury?. Authorea Preprints.


Hirshorn, N. S., Zuromski, L. M., Rapp, C., McCubbin, I., Yu, F., and Hallar, A. G.: Seasonal
Significance of New Particle Formation Impacts on Cloud Condensation Nuclei at a
Mountaintop Location, Atmos. Chem. Phys.,, 2022.
Hodshire, A. L.,  E. J. T. Levin, A. G. Hallar, C. N. Rapp, D. R. Gilchrist, I. McCubbin, and G. R. McMeeking,
Atmos. Chem. Phys. Discuss.,
Koolik, L., Roesch, M., Deloya, L. J. F., Shen, C., Hallar, A. G., McCubbin, I. B., and Cziczo, D. J.: A Phase
Separation Inlet for Droplets, Ice Residuals, and Interstitial Aerosols, Atmos. Meas. Tech. Discuss.,


Rose, C., Collaud Coen, M., Andrews, E., Lin, Y., Bossert, I., Lund Myhre, C., Tuch, T., Wiedensohler, A.,
Fiebig, M., Aalto, P., Alastuey, A., Alonso-Blanco, E., Andrade, M., Artíñano, B., Arsov, T., Baltensperger,
U., Bastian, S., Bath, O., Beukes, J. P., Brem, B. T., Bukowiecki, N., Casquero-Vera, J. A., Conil, S.,
Eleftheriadis, K., Favez, O., Flentje, H., Gini, M. I., Gómez-Moreno, F. J., Gysel-Beer, M., Hallar, A. G., ….and
Laj, P.: Seasonality of the particle number concentration and size distribution: a global analysis retrieved
from the network of Global Atmosphere Watch (GAW) near-surface observatories, Atmos. Chem. Phys., 21,
17185–17223, 2021.
Grasmick Coltin, Bart Geerts, Xia Chu, Jeffrey R. French, and Robert M. Rauber. "Detailed Dual-Doppler
Structure of Kelvin–Helmholtz Waves from an Airborne Profiling Radar over Complex Terrain.
Part II: Evidence for Precipitation Enhancement from Observations and Modeling.
"Journal of the Atmospheric Sciences 78, no. 11 (2021): 3455-3472.
Pan, J., Durand, M.T., Courville, Z., Vander Jagt, B.J., Molotch, N.P., Margulis, S.A., Kim,
E.J., Schneebeli, M. and Mätzler, C., 2021. Evaluation of stereology for snow microstructure
measurement and microwave emission modeling: a case study. International Journal of
Digital Earth14(10), pp.1316-1336.
Pan, Jinmei, Michael T. Durand, Z. Courville, B. J. Vander Jagt, Noah P. Molotch, Steven A. Margulis,
Edward J. Kim, Martin Schneebeli, and Christian Mätzler. "Evaluation of stereology for snow
microstructure measurement and microwave emission modeling: A case study.
"International Journal of Digital Earth" 14, no. 10 (2021): 1316-1336.


Kassianov, E. M. Pekour, L. Berg, G. Chirokova, C. Flynn, A. G. Hallar, A. Setyan, D. Zhang, J. Uin,
J. Fast: Aerosol Total Volume Estimation from Wavelength- and Size-resolved Scattering Coefficient
Data: A New Method, Earth and Space Science, Paper, 7.9 (2020): e2019EA000863.


Laj, P., A. Bigi, C. Rose, E. Andrews, C. L. Myhre, M. Collaud Coen, A. Wiedensohler, M. Schultz, J. A. Ogren,
J. Gliss, A. Mortier, M. Pandolfi, T. Petäjä, M. Kulmala, S-W Kim, W. Aas, J-P Putaud, M. Fiebig, O. Mayol
 Bracero, N. Prats, K. sellegri, J-M Pichon, J-M Metzger, P. Tulet, P. Villani, S. Conil, A. Alastuey, A. G. Hallar,
...A Global Analysis of Climate-Relevant Aerosol properties retrieved from the network of GAW near-surface
observatories, Atmospheric Measurement Techniques, 2020.
Grasmick, C. and Geerts, B., 2020. Detailed dual-Doppler structure of Kelvin–Helmholtz waves from an
airborne profiling radar over complex terrain. Part I: Dynamic structure. Journal of the Atmospheric
Sciences, 77(5), pp.1761-1782.


Dommergue, A., Amato, P., Tignat-Perrier, R., Magand, O., Thollot, A., Joly, M., Bouvier, L.,
Sellegri, K., Vogel, T., Sonke, J.E. and Jaffrezo, J.L., 2019. Methods to investigate the global
atmospheric microbiome. Frontiers in Microbiology, 10, p.243.
Kurz, A.Y., Blum, J.D., Washburn, S.J. and Baskaran, M., 2019. Changes in the mercury
isotopic composition of sediments from a remote alpine lake in Wyoming, USA. Science of The
Total Environment, 669, pp.973-982.
Petersen, R.C., A. G. Hallar, I. B. McCubbin, J. A. Ogren, E. Andrews, D. Lowenthal, R.
Gorder, R. Purcell, D. Sleeth & I. Novosselov (2019) Numerical, wind-tunnel, and atmospheric
evaluation of a turbulent ground based inlet sampling system, Aerosol Science and
Technology, DOI: 10.1080/02786826.2019.1602718


Clegg, S.L., Mazzoleni, L.R., Samburova, V., Taylor, N.F., Collins, D.R., Schum, S.K. and
Hallar, A.G., 2019. Modelling the hygroscopic growth factors of aerosol material containing a
large water-soluble organic fraction, collected at the Storm Peak Laboratory. Atmospheric
Environment. DOI: 10.1016/j.atmosenv.2019.05.068


Japngie-Green, C.M., Andrews, E., McCubbin, I.B., Ogren, J.A. and Hallar, A.G., 2019.
Climatology of Aerosol Optical Properties at Storm Peak Laboratory. Aerosol and Air Quality
Research, 19(6), pp.1205-1213.
Lowenthal, D. H., Hallar, A. G., David, R. O., McCubbin, I. B., Borys, R. D., and Mace, G. G.:
Mixed-phase orographic cloud microphysics during StormVEx and IFRACS, Atmos. Chem.
Phys., 19, 5387-5401,, 2019.



Hallar, A.G., N. Molotch, J. Hand, B. Livneh, I. McCubbin, R. Petersen, J. Michalsky, and D.
Lowenthal, 2018: Impacts of Increasing Aridity and Wildfires on Aerosol Loading in the
Intermountain Western U.S., Environ. Res. Lett. 12 014006.
Collaud Coen, M., Andrews, E., Aliaga, D., Andrade, M., Angelov, H., Bukowiecki, N., Ealo,M.,
Fialho, P., Flentje, H., Hallar, A. G., Hooda, R., Kalapov, I., Krejci, R., Lin, N.-H.,Marinoni, A.,
Ming, J., Nguyen, N. A., Pandolfi, M., Pont, V., Ries, L., Rodríguez, S., Schauer,G., Sellegri, K.,
Sharma, S., Sun, J., Tunved, P., Velasquez, P., and Ruffieux, D.: Identificationof topographic
features influencing aerosol observations at high altitude stations, Atmos. Chem.Phys., 18,
12289-12313,, 2018.


Andrews, E., Sheridan, P.J., Ogren, J.A., Hageman, D., Jefferson, A., Wendell, J., Alastuey, A.,
Alados-Arboledas, L., Bergin, M., Ealo, M. and Hallar, A.G., 2018. Overview of the
NOAA/ESRL federated aerosol network. Bulletin of the American Meteorological Society,
Hindman, E.E., Meyer, M.C., Gedzelman, S.D. and Bandosz, T.J., 2018. Acidic cloud episodes
in the northern Colorado Rockies: inadvertent weather modification? The Journal of Weather
Modification, 34(1), pp.18-30.
Bianco, A., Deguillaume, L., Vaïtilingom, M., Nicol, E., Baray, J.L., Chaumerliac, N. and
Bridoux, M., 2018. Molecular characterization of cloud water samples collected at the puy de
Dôme (France) by Fourier transform ion cyclotron resonance mass spectrometry. Environmental
science & technology, 52(18), pp.10275-10285.
DeMott, P.J., Möhler, O., Cziczo, D.J., Hiranuma, N., Petters, M.D., Petters, S.S., Belosi, F.,
Bingemer, H.G., Brooks, S.D., Budke, C. and Burkert-Kohn, M., 2018. The Fifth International
Workshop on Ice Nucleation phase 2 (FIN-02): laboratory intercomparison of ice nucleation
measurements. Atmospheric Measurement Techniques (Online), 11(PNNL-SA-141072).
Lacher, L., DeMott, P.J., Levin, E.J., Suski, K.J., Boose, Y., Zipori, A., Herrmann, E.,
Bukowiecki, N., Steinbacher, M., Gute, E. and Abbatt, J.P., 2018. Background Free-
Tropospheric Ice Nucleating Particle Concentrations at Mixed-Phase Cloud Conditions. Journal
of Geophysical Research: Atmospheres, 123(18), pp.10-506.
Taylor, N., D. Collins, D. Lowenthal, B. Zielinska, V. Samburova, N. Kumar, G. Hallar, L.
Mazzoleni, and I. McCubbin, 2017: Hygroscopic growth of water soluble organic carbon
isolated from atmospheric aerosol collected at U.S. national parks and Storm Peak Laboratory,
Atmospheric Chemistry and Physics, 17.4, 2555-2571.
Kassianov, E., M. Pekour, C. Flynn, L. K. Berg, J. Beranek, A. Zelenyuk, C. Zhao, L.R. Leung,
P.L. Ma, J. Barnard, A.G. Hallar, I.B. McCubbin, E.W. Eloranta, A. McComiskey, P.J. Rasch,
2017: Large Contribution of Coarse Mode to Aerosol Microphysical and Optical Properties:
Evidence from Ground-based Observations of a Trans-Pacific Asian Dust Outbreak at a High-
Elevation North American Site, Journal of Atmospheric Sciences, 74.5 (2017): 1431-1443.


Hallar, A.G. E. Andrews, N. Bukowiecki, D. A. Jaffe, N-H Lin, 2016: Overview of the Special
Issue “Selected Papers from the 2nd Atmospheric Chemistry and Physics at Mountain Sites
Symposium” Aerosol and Air Quality Research, Volume 16, No. 3, March 2016, Pages 471-477,
doi: 10.4209/aaqr.2016.02.0077
Sullivan, R. C., Crippa, P., Hallar A. G., Clarisse, L., Leaitch, W. R., Aneja, V. P., and Pryor
S.C. (2016) Using Satellite-based Measurements to Explore Spatiotemporal Scales and
Variability of Drivers of New Particle Formation, J. of Geophysical Research, 121 (20).
Lowenthal, D., Hallar, A.G., McCubbin, I., David, R., Borys, R., Blossey, P., Muhlbauer, A.,
Kuang, Z., and Moore, M. (2016), Isotopic Fractionation in Wintertime Orographic Clouds,
Journal of Atmospheric and Oceanic Technology, 33(12), 2663-2678.
Yu, F., G. Luo, A. G. Hallar (2016), Vertical Profiles and Seasonal Variations of Key Parameters
Controlling Particle Formation and Growth at Storm Peak Laboratory, Aerosol and Air Quality
Research, 16(3), 900-908, doi:10.4209/aaqr.2015.05.0341
Hallar, A.G., R. Petersen, I. B. McCubbin, D. Lowenthal, S. Lee, E. Andrews, F. Yu (2016),
Climatology of New Particle Formation and Corresponding Precursors at Storm Peak
Laboratory, Aerosol and Air Quality Research, 16(3), 816-826, doi: 10.4209/aaqr.2015.05.0341.


Hallar, A.G., R. Petersen, E. Andrews, J. Michalsky, I. B. McCubbin, J. A. Ogren (2015),
Contributions of Dust and Biomass-burning to Aerosols at a Colorado Mountain-top Site, Atmos.
Chem. Phys. Discuss., 15, 21299-21334, doi:10.5194/acpd-15-21299-2015.
Matrosov, Sergey Y. (2015) Evaluations of the Spheroidal Particle Model for Describing Cloud
Radar Depolarization Ratios of Ice Hydrometeors, Journal of Atmospheric and Oceanic
Technology, 32.5, 865-879.
Geerts, Bart, Binod Pokharel, and David A.R. Kristovich (2015), Blowing Snow as a Natural
Glaciogenic Cloud Seeding Mechanism, Monthly Weather Review 2015.
Dorsi, S. W., et al. (2015), Phase-Specific Characteristics of Wintertime Clouds Across a
Midlatitude Mountain Range, Monthly Weather Review, 143.10, 4181-4197.
Hammonds, Kevin D., Gerald G. Mace, and Sergey Y. Matrosov (2014), Characterizing the
Radar Backscatter-Cross-Section Sensitivities of Ice-Phase Hydrometeor Size Distributions via a
Simple Scaling of the Clausius Mossotti Factor, Journal of Applied Meteorology and
Climatology, 53.12, 2761-2774.
Kingsmill, David E., et al. (2015), Mountain Waves and Orographic Precipitation in a Northern
Colorado Winter Storm, Quarterly Journal of the Royal Meteorological Society.
Hallar, A.G., R. Petersen, I. B. McCubbin, D. Lowenthal, S. Lee, E. Andrews, F. Yu (2015),
Climatology of New Particle Formation and Corresponding Precursors at Storm Peak
Laboratory, Aerosol and Air Quality Research, doi: 10.4209/aaqr.2015.05.0341 .
Weiss-Penzias, P., et al. (2015), Use of a Global Model to Understand Speciated Atmospheric
Mercury Observations at Five High-Elevation Sites, Atmos. Chemistry and Physics, 15.3, 1161-
Yu, F., G. Luo, S. C. Pryor, P. R. Pillai, S. H. Lee, J. Ortega, J. J. Schwab, A. G. Hallar, W. R.
Leaitch, V. P. Aneja, J. N. Smith, J. T. Walker, O. Hogrefe, and K. L. Demerjian (2015), Spring
and Summer Contrast in New Particle Formation Over Nine Forest Areas in North America,
Atmospheric Chemistry and Physics, acp-2015-453.
Yu, F., G. Luo, A. G. Hallar (2015), Vertical Profiles and Seasonal Variations of Key Parameters
Controlling Particle Formation and Growth at Storm Peak Laboratory, Aerosol and Air Quality
Research, doi:10.4209/aaqr.2015.05.0341
Kristensen, T.B., L. Du, Q. T. Nguyen, J. K. Nojgaard, C. Bender Koch, O. Faurskov Nielsen, A.
G. Hallar, D. H. Lowenthal, B. Nekat, D. van Pinxteren, H. Herrmann, M. Glasius, H. G.
Kjaergaard, M. Bilde (2015) Physico Chemical Properties of HULIS from Different
Environments, Journal of Atmospheric Chemistry, 72(1), 65-80.


Yu, F. and A. G. Hallar (2014), Difference in Particle Formation at a Mountain-top Location
During the Spring and Summer: Implications for the Role of Sulfuric Acid and Organics in
Nucleation, J. of Geophysical Research, 119, 21, 12,246 12,255.
Makkonen, R., et al. (2014), Evaluation of Aerosol Number Concentrations in NorESM with
Improved Nucleation Parameterization, Atmos. Chem. Phys., 14.10, 5127-5152.


Berisford, D.F., Molotch, N.P., Durand, M.T. and Painter, T.H. (2013), Portable Spectral Profiler
Probe for Rapid Snow Grain Size Stratigraphy.Cold Regions Science and Technology, 85, 183-190.
Samburova, V., A. G. Hallar, L. R. Mazzoleni, P. Saranjampour, D. Lowenthal, S. Kohl, and B.
Zielinska (2013), Composition of the Water-Soluble Organic Fraction in Atmospheric Remote
Aerosols, Environmental Chemistry,
Makkonen, R., Seland, Ø., Kirkevåg, A., Iversen, T., and Kristjánsson, J. E. (2013), Evaluation
of Aerosol Number Concentrations in NorESM with Improved Nucleation Parameterisation,
Atmos. Chem. Phys. Discuss., 13, 26389-26450, doi:10.5194/acpd-13-26389-2013.
Hallar, A.G., D. H. Lowenthal, S. L. Clegg, V. Samburova, N. Taylor, L. R Mazzoleni, B. K.
Zielinska, T. B Kristensen, G. Chirokova, I. B. McCubbin, C. Dodson, and D. Collins (2013),
Chemical and Hygroscopic Properties of Aerosol Organics at Storm Peak Laboratory, J. of
Geophysical Research, 118, 4767 - 4779, doi:10.1002/jgrd.50373.
Zhao, Y., A. G. Hallar, and L. R. Mazzoleni (2013), Atmospheric Organic Matter in Clouds:
Exact Masses and Molecular Formula Identification Using Ultrahigh Resolution FT-ICR Mass
Spectrometry, Atmos. Chem. Phys. Discuss., 13, 20561-20610, doi:10.5194/acpd-13-20561-2013
Friedman, B., A. Zelenyuk,, J. Beránek, G. Kulkarni, M. Pekour, A.G. Hallar, I.B. McCubbin, J.
A. Thornton, and D. J. Cziczo (2013), Aerosol Measurements at a High Elevation Site:
Composition, Size, and Cloud Condensation Nuclei Activity, Atmos. Chem. Phys. Discuss., 13,
18277-18306, doi:10.5194/acpd-13-18277-2013.
Asmi, A., Collaud Coen, M., Ogren, J. A., Andrews, E., Sheridan, P., Jefferson, A., Weingartner,

E., Baltensperger, U., Bukowiecki, N., Lihavainen, H., Kivekäs, N., Asmi, E., Aalto, P. P.,

Kulmala, M., Wiedensohler, A., Birmili, W., Hamed, A., O'Dowd, C., G Jennings, S., Weller, R.,
Flentje, H., Fjaeraa, A. M., Fiebig, M., Myhre, C. L., Hallar, A. G., Swietlicki, E., Kristensson,
A., and Laj, P. (2013), Aerosol Decadal Trends – Part 2: In-situ Aerosol Particle Number
Concentrations at GAW and ACTRIS Stations, Atmos. Chem. Phys., 13, 895-916,
Amin, Hardik S, Rachel S. Russo, Barkley Sive, E. Richard Hoebeke, Craig Dodson, Ian B.
McCubbin, A. G. Hallar, Kara E. Huff Hartz, Monoterpene Emissions from Bark Beetle Infested
Engelmann Spruce Trees, Atmospheric Environment, 72, 130–133.
Berg, A. R., Heald, C. L., Huff Hartz, K. E., Hallar, A. G., Meddens, A. J. H., Hicke, J. A.,
Lamarque, J.-F., and Tilmes, S. (2013), The Impact of Bark Beetle Infestations on Monoterpene
Emissions and Secondary Organic Aerosol Formation in Western North America, Atmos. Chem.
Phys., 13, 3149-3161, doi:10.5194/acp-13-3149-2013.
Stephen M. Saleeby, William R. Cotton, Douglas Lowenthal, and Joe Messina (2013), Aerosol
Impacts on the Microphysical Growth Processes of Orographic Snowfall, Journal of Applied
Meteorology and Climatology, doi:


Hallar, A.G., A. Fridlind, J. A. Huffman, Biological Aerosol Effects on Clouds and Precipitation:
EOS, Meeting Summary, 93, 51, December 18, 2012.
Amin, H., P.T. Atkins, R. Russo, A. W. Brown, B. Sive, A. G. Hallar, K.E. Huff Hartz (2012),
Effect of Bark Beetle Infestation on Secondary Organic Aerosol Precursor Emissions,
Environmental Science & Technology, DOI: 10.1021/es204205m.
Matrosov, S.Y., G. G. Mace, R. Marchand, M. D. Shupe, A. G. Hallar, I. B. McCubbin (2012),
Influence of Ice Hydrometeor Habits on Scanning Polarimertic Cloud Radar Measurements, J. of
Atmospheric and Oceanic Technology, 29, 989-1008.
Kristensen, T., H. Wex, B. Nekat, J. K. Nøjgaard, D. van Pinxteren, D. H. Lowenthal, L. R.
Mazzoleni,K. Dieckmann, C.B. Koch, T. F. Mentel, H. Herrmann, A. G. Hallar, F. Stratmann,
and Merete Bilde (2012), Hygroscopic Growth and CCN Activity of HULIS from Different
Environments, J. of Geophysical Research, 117(D22).
Mazzoleni, L.R., P. Saranjampour, M. M. Dalbec, V. Samburova, A. G. Hallar, B. Zielinska, D.
Lowenthal, and Steve Kohl. (2012), Identification of Water-Soluble Organic Carbon in
Nonurban Aerosols Using Ultrahigh- Resolution FT-ICR Mass Spectrometry: Organic Anions,
Environmental Chemistry, DOI: 10.1071/EN11167.
Bowers, R.M. Bowers, McCubbin, I.B., Hallar, A.G., Fierer, N. (2012), Seasonal Variability in
Airborne Bacterial Communities at a High-Elevation Site in the Colorado Rocky Mountains,
Atmospheric Environment, 50, 41-49
Baustian, K. J., D. J. Cziczo, M. E. Wise, K. A. Pratt, G. Kulkarni, A. G. Hallar, and M. A.
Tolbert (2012), Importance of Aerosol Composition, Mixing State, and Morphology for
Heterogeneous Ice Nucleation: A Combined Field and Laboratory Approach, J. Geophys. Res.,
117, D06217, doi:10.1029/2011JD016784.


Hallar, A.G., G. Chirokova, I.B. McCubbin, T.H. Painter, C. Wiedinmyer, C. Dodson (2011),
Atmospheric Bioaerosols Transported Via Dust Storms in Western United States, Geophysical
Res. Letters, 38, L17801, doi:10.1029/2011GL048166.
Hallar, A.G., D. H. Lowenthal, G. Chirokova. C. Wiedinmyer, R.D. Borys (2011), Persistent
Daily New Particle Formation at a Mountain-Top Location, Atmospheric Environment,
Hallar, A.G., I. B. McCubbin, J. M. Wright (2011), CHANGE: A Place-Based Curriculum for
Understanding Climate Change at Storm Peak Laboratory, Colorado, Bulletin of the American
Meteorological Society, doi: 10.1175/2011BAMS3026.1.
Zhang, Q., J.L. Jimenez, M.R. Canagaratna, I.M. Ulbrich, S.N. Ng, D.R. Worsnop, and Y. Sun
(2011), Understanding Atmospheric Organic Aerosols via Factor Analysis of Aerosol Mass
Spectrometry: a Review. Analytical and Bioanalytical Chemistry, DOI:10.1007/s00216-011-
Samy, S., L. R. Mazzoleni, S. Mishra, B. Zielinska, A. G. Hallar (2010), Water-Soluble Organic
Compounds at a Mountain-Top Site in Colorado, USA, Atmospheric Environment, 44, 1663-
Hallar, A.G., I.B. McCubbin, B. Hallar, R. Levine, W. Stockwell, J. Lopez, J. Wright (2010),
Science in the Mountains: A Unique Research Experience to Enhance Diversity in the
Geosciences. J. GeoScience Education, 58(2), 213-220.
DeMott, P. J., A. J. Prenni, X. Liu, S. M. Kreidenweis, M. D. Petters, C. H. Twohy, M. S.
Richardson, T. Eidhammer, and D. C. Rogers (2010), Predicting Global Atmospheric Ice Nuclei
Distributions and Their Impacts on Climate, Proceedings of the National Academy of Sciences of
the United States of America, 107(25), 11217-11222.


de Wekker, S.F.J., A. Ameen, G. Song, B.B. Stephens, A.G. Hallar, and I.B. McCubbin (2009),
A Preliminary Investigation of Boundary Layer Effects on Daytime Atmospheric CO2
Concentrations at a Mountaintop Location in the Rocky Mountains. Acta Geophysica,57(4), 904-
922, doi:10.2478/s11600-009-0033-6.
Saleeby, S.M., W.R. Cotton, D. Lowenthal, R.D. Borys, and M.A. Wetzel (2009), Influence of
Cloud Condensation Nuclei on Orographic Snowfall. J. Appl. Meteor. Climatol.,48, 903-922.
Wiedinmyer, C., R.M. Bowers, N. Fierer, E. Horanyi, M. Hannigan, A.G. Hallar, I. McCubbin,
K. Baustian (2009), The Contribution of Biological Particles to Observed Particulate Organic
Carbon at a Remote High Altitude Site. Atmos. Environ., 43, 4278-4282.
Faïn, X., Obrist, D., Hallar, A. G., McCubbin, I., and Rahn, T. (2009), High Levels of Reactive
Gaseous Mercury Observed at a High Elevation Research Laboratory in the Rocky Mountains,
Atmos. Chem. Phys. Discuss., 9, 15641-15671.
Bowers, R.M., C.L. Lauber, C. Wiedinmyer, M. Hamady, A.G. Hallar, R. Fall, R. Knight, and N.
Fierer (2009), Characterization of Airborne Microbial Communities at a High-Elevation Site and
their Potential to Act as Atmospheric Ice Nuclei, Applied and Environmental Microbiology,
75(15), 1–2, doi:10.1128/AEM.00447-09.
Hindman, E.E. (2009), An ‘Aerosol Effect’ Detected in Winter Orographic Clouds but an Effect
on Precipitation Could Not be Determined. J. Weather Modification.
Cziczo, D.J., O. Stetzer, A. Worringen, M. Ebert, S. Weinbruch, M.Kamphus, S.J. Gallavardin,
J. Curtius, S. Borrmann, K.D. Froyd, S. Mertes, O. Möhler and U. Lohmann (2009), Inadvertent
Climate Modification Due to Anthropogenic Lead, Nature Geoscience, doi: 10.1038/NGEO499.
Jimenez, J.L., M.R. Canagaratna, N.M. Donahue, A.S.H. Prevot, Q. Zhang, J.H. Kroll, P.F.
DeCarlo, J.D. Allan, H. Coe, N.L. Ng, A.C. Aiken, K.D. Docherty, I.M. Ulbrich, A.P. Grieshop,
A.L. Robinson, J. Duplissy, J. D. Smith, K.R. Wilson, V.A. Lanz, C. Hueglin, Y.L. Sun, J. Tian,
A. Laaksonen, T. Raatikainen, J. Rautiainen, P. Vaattovaara, M. Ehn, M. Kulmala, J.M.
Tomlinson, D.R. Collins, M.J. Cubison , E.J. Dunlea, J.A. Huffman, T.B. Onasch, M.R. Alfarra,
P.I. Williams, K. Bower, Y. Kondo, J. Schneider, F. Drewnick, S. Borrmann, S. Weimer, K.
Demerjian, D. Salcedo, L. Cottrell, R. Griffin, A. Takami, T. Miyoshi, S. Hatakeyama, A.
Shimono, J.Y Sun, Y.M. Zhang, K. Dzepina, J.R. Kimmel, D. Sueper, J.T. Jayne, S.C. Herndon,
A.M. Trimborn, L.R. Williams, E.C. Wood, C.E. Kolb, A.M. Middlebrook, U. Baltensperger,
and D.R. Worsnop (2009), Evolution of Organic Aerosols in the Atmosphere. Science, 326,
1525-1529, doi: 10.1126/science.1180353.


Phillips, V.T.J., P.J. DeMott, C. Andronache (2008), An Empirical Parameterization of
Heteorogeneous Ice Nucleation for Multiple Chemical Species of Aerosol. J. Atmos Sci.,65,
2757-2783, doi: 10.1175/2007JAS2546.1
Obrist D., A.G. Hallar, I. McCubbin, B.B. Stephens, and T. Rahn (2008), Measurements of
Atmospheric Mercury at Storm Peak Laboratory in the Rocky Mountains: Evidence for LongRange
Transport from Asia, Boundary Layer Contributions, and Plant Mercury Uptake. Atmos.
Environ., doi:10.1016/j.atmosenv.2008.06.051.


Zhang, Q., J.L. Jimenez, M.R. Canagaratna, J.D. Allan, H. Coe, I. Ulbrich, M.R. Alfarra, A.
Takami, A.M. Middlebrook, Y.L. Sun, K. Dzepina, E. Dunlea, K. Docherty, P.F. DeCarlo, D.
Salcedo, T. Onasch, J.T. Jayne, T. Miyoshi, A. Shimono, S. Hatakeyama, N. Takegawa, Y.
Kondo, J. Schneider, F. Drewnick, S. Weimer, K. Demerjian, P. Williams, K. Bower, R.
Bahreini, L. Cottrell, R.J. Griffin, J. Rautiainen, and D.R. Worsnop (2007), Ubiquity and
Dominance of Oxygenated Species in Organic Aerosols in Anthropogenically—Influenced
Northern Hemisphere Mid-latitudes, Geophysical Research Letters, 34, L13801,
Kim, D.C., C. Loughner, M.A. Wetzel and W.R, Stockwell (2007), A comparison of Photolysis
Rate Parameters Estimated from Measured and Simulated Actinic Flux for Wintertime
Conditions at Storm Peak Laboratory, Colorado. J. Atmos. Chem., doi:10.1007/210874-007-
Vellore, R., D. Koracin, M. Wetzel, S, Chai, and Q. Wang (2007), Challenges in Mesoscale
Prediction of the Nocturnal Stratocumulus-Topped Marine Boundary Layer and Implications for
Operational Forecasting. Weather and Forecasting,22(5), 1101-1122.


Richardson, M.S., P.J. DeMott, S.M. Kreidenweis, D. Cziczo, E.J. Dunlea, J.L. Jimenez, D.
Thomson, L. Ashbaugh, R.D. Borys, D. Westphal, G. Casuccio, T. Lersch (2006), Measurements
of Heterogeneous Ice Nuclei in the Western US in Springtime and Their Relation to Aerosol
Characteristics. Geophys. Res.,112, D02209, doi:10.1029/2006JD007500.


Billings, B.J., V. Grubišić, and R.D. Borys (2005), Maintenance of a Mountain Valley Cold
Pool: A Numerical Study, Monthly Weather Review, Mon. Wea. Rev., 134, 2266-2274.
Cziczo, D., P. DeMott, D. Thomson, D. Murphy, S. Brooks, M. Richardson, S. Kreidenweis, E.
Dunlea, and J. Jimenez (2005), Single Particle Studies of Aerosol/Ice Cloud Interactions,
Geophys. Res. Abs., 7, 03592, Sref-ID: 1607-7962/gra/EGU05-A-03592.
Hindman, E.E., R.D. Borys, D.H. Lowenthal, and N. Phillip (2005), Long Term, Wintertime
Aerosol, Cloud and Precipitation Measurements in the Northern Colorado Rocky Mountains.
Atmos. Res., 82, 194-202.
Twohy, C.H., M.D. Petters, J.R. Snider, B. Stevens, W. Tahnk, M. Wetzel, L. Russell, and J. L.
Brenguier (2005), Measurements of the Indirect Effect of Aerosol Particles on Marine Stratiform
Clouds: Microphysics, J. Geophys. Res.,110, D08203, doi:10.1029/2004JD005116.
Wetzel, M.A., and J.R. Slusser (2005), Mesoscale Distributions of Ultraviolet Spectral
Irradiance, Actinic Flux, and Photolysis Rates Derived from Multispectral Satellite Data and
Radiative Transfer Models, Optical Engineering, 44(4), doi:10.1117/1.1889467.
Cziczo, D.J., P.J. DeMott, S.D. Brooks, A.J. Prenni, D.S. Thomson, D. Baumgardner, J.C.
Wilson, S.M. Kreidenweis, and D.M. Murphy (2004), Observations of Organic Species and
Atmospheric Ice Formation, Geophys. Res. Lett.,31, 12116, doi:10.1029/2004GL019822.
Lowenthal, D.H., R.D. Borys, T.W. Choularton, K.N. Bower, M.J. Flynn, and M.W. Gallagher
(2004), Parameterization of the cloud droplet - sulfate relationship. Atmos. Environ., 38, 287-
Wetzel, M., M. Meyers, R. Borys, R. McAnelly, W. Cotton, A. Rossi, P. Frisbie, D. Nadler, D.
Lowenthal, S. Cohn, and W. Brown (2004), Mesoscale Snowfall Prediction and Verification in
Mountainous Terrain, Weather and Forecasting, 19, 806-828.


Borys, R.D., D.H. Lowenthal, S.A. Cohn, and W.O.J. Brown (2003), Mountaintop and Radar
Measurements of Anthropogenic Aerosol Effects on Snow Growth and Snowfall Rate, J. Geo.
Phys. Res. Let., 30(10), 1538, doi:10.1029/2002GL016855.
Cziczo, D.J., P.J. DeMott, A.J. Prenni, B. Jesse, S. Kreidenweis, P.K. Hudson, J. Schreiner, D.S.
Thompson, C.S. Brock, and D.M. Murphy (2003), A Method for Single Particle Mass
Spectrometry of Ice Nuclei, Aero. Sci. Tech., 37, 460-470.
DeMott, P.J., D.J. Cziczo, A.J. Prenni, D.M. Murphy, S.M. Kreidenweis, D.S. Thomson, R.
Borys, and D.C. Rogers (2003), Measurements of the Concentration and Composition of Nuclei
for Cirrus Formation. Proc. Natnl. Acad. Sci.,100(25), 14655-14660.
Evans, K.F., R.P. Lawson, P. Zmarzly, D. O'Connor, and W.J. Wiscombe (2003), In Situ Cloud
Sensing with Multiple Scattering Lidar: Simulations and Demonstration, J. Atmos. Ocean Tech.,
20, 1505-1522.
Lowenthal, D.H., and R.D. Borys (2003), Parameterization of the Cloud Droplet – Sulfate
Relationship, Atmos. Environ., 38, 287-292.
Meyers, M.P., J.S. Snook, D.A. Wesley, and G.S. Poulos (2003), A Rocky Mountain Storm, Part
II: The Forest Blowdown Over the West Slope of the Northern Colorado Mountains -
Observations, Analysis, and Modeling, Weather and Forecasting, 18, 662-674.
Stevens, B., D. H. Lenschow, G. Vali, H. Gerber, A. Bandy, B. Blomquist, J.-L. Brenguier, C. S.
Bretherton, F. Burnet, T. Campos, S. Chai, I. Faloona, D. Friesen, S. Haimov, K. Laursen, D. K.
Lilly, S. M. Loehrer, S. P. Malinowski, B. Morely, M. D. Petters, D. C. Rogers, L. Russell, V.
Savcic-Jovcic, J. R. Snider, D. Straub, M. J. Szumowski, H. Takagi, D. C. Thorton, M. Tschudi,
C. Twohy, M. Wetzel, and M. C. van Zanten (2003), Dynamics and Chemistry of Marine
Stratocumulus – DYCOMS II, Bull. Amer. Met. Soc., 84, 579-593.
Wetzel, M.A., G.E. Shaw, J. Slusser, R.D. Borys and C. Cahill (2003), Physical, Chemical and
Ultraviolet Radiative Signatures of Aerosol in Central Alaska, J. Geophys. Res., 108(D14), 4418,
Yuter, S. (2003), Observations of Precipitation Characteristics Near and Within the Melting
Layer, Submitted, J. Atmos. Sci.


Collett, Jr., J.L., A. Bator, D.E. Sherman, K.F. Moore, K.J. Hoag, B.B. Demoz, X. Rao, and J.E.
Reilly (2002), The Chemical Composition of Fogs and Intercepted Clouds in the United States,
Atmos. Res. 64, 29-40.
Gonzalez, A., J.C. Perez, F. Herrera, F. Rosa, M.A. Wetzel, R.D. Borys, and D.H. Lowenthal
(2002), Stratocumulus Properties Retrieval Method From NOAA-AVHRR Data Based on the
Discretization of Cloud Parameters, Int. J. Remote Sensing, 23(4), 627-645.
Hindman, E.E., M.C. Meyer, S.D. Gedzelman, and T.J. Bandosz (2002), Acidic Cloud Episodes
in the Northern Colorado Rockies: Inadvertent Weather Modification? J. Weather Modif. (ISBN
0739-1781), 34, 18-30.
Lowenthal, D.H., R.D. Borys, and M.A. Wetzel (2002), Aerosol Distributions and Cloud
Interactions at a Mountaintop Laboratory, J. Geophys. Res.,107(D18), 4345,
Perez, J.C., F. Herrera, F. Rosa, A. Gonzalez, M.A. Wetzel, R.D. Borys, and D.H. Lowenthal
(2002), Retrieval of Marine Stratus Cloud Droplet Size from NOAA-AVHRR Nighttime
Imagery, Remote. Sens. Environ., 73, 31-45.


Hindman, E.E. (2001), The Cloud Catchers, Weatherwise, 54, 30-36.
Wetzel, M.A., G. Vali, W. Thompson, S. Chai, T. Haack, M. Szumowski and R. Kelly (2001),
Evaluation of COAMPS Forecasts Using Satellite Retrievals and Aircraft Measurements,
Weather and Forecasting, 16, 588-599.


Borys, R.D., D.H. Lowenthal, and D.L. Mitchell (2000), The Relationships Among Cloud
Microphysics, Chemistry and Precipitation Rate in Cold Mountain Clouds, Atmos. Environ., 34,
Lowenthal, D.H. and R.D. Borys (2000), Sources of Microphysical Variation in Marine
Statiform Clouds in the North Atlantic, Geophys. Res. Lett., 27(10), 1491-1494.
Perez, J.C., F. Herrera, F. Rosa, A. Gonzales, M. Wetzel, R. Borys, and D. Lowenthal (2000),
Retrieval of Marine Stratus Cloud Droplet Size From NOAA-AVHRR Night Imagery, Remote
Sensing of Environment, 73, 31-45.


Wetzel, M.A., and L.L. Stowe (1999), Satellite-Observed Patterns in Stratus Cloud
Microphysics, Aerosol Optical Thickness and Shortwave Radiative Forcing, J. Geophysical
Research,104, 31286-31299.
Xu, G., D.E. Sherman, E. Andrews, K. Moore, D. Straub, K. Hoag, and J. Collett, Jr. (1999), The
Influence of Chemical Heterogeneity Among Cloud Drop Populations on Processing of
Chemical Species in Winter Clouds, Atmos. Res. 51, 119-140.


Borys, R.D., D.H. Lowenthal, and M.A. Wetzel (1998), Chemical and Microphysical Properties
of Marine Stratiform Clouds in the North Atlantic, J. Geophys. Res., 103(D17), 22,073-22,085.
Hindman, E.E., and R.D. Borys (1998), Long-Term Cloud Droplet Measurements for Climate-
Change Studies, World Res. Rev., 10, 569-576.
Wetzel, M., D. Dempsey, S. Nilsson, M. Ramamurthy, S. Koch, J. Moody, D. Knight, C.
Murphy, D. Fulker, M. Marlino, M. Morgan, D. Yarger, D. Vietor, and G. Cox (1998), Faculty
Workshop on Using Instructional Technologies and Satellite Data for College-Level Education
in the Atmospheric and Earth Sciences, Bulletin, American Meteorological Society, 79, 2153-


Borys, R.D., and M.A. Wetzel (1997), Storm Peak Laboratory: A Research, Teaching and
Service Facility for the Atmospheric Sciences, Bull., Amer. Meteor. Soc., 78, 2115-2123.
Currie, I. (1996), Ben Nevis Observatory: A Vision for the Millennium, Weather, 51, 360.
Hallett, J. (1996), The Cleaner Feldberg Cloud Experiment 1990, Book Review, Bulletin,
Amer. Meteor. Soc., 77, 2737-2738.
Wetzel, M.A., R.D. Borys, and L. Xu (1996), Analysis Methods for Land-Based Fog Droplet
Size and Optical Depth Using Satellite Data, J. Applied Meteorology, 35, 810-829, 1995.
Borys, R.D., D.L. Lowenthal, and D.L. Mitchell (1996), CCN Regulation of Snowfall Rates,
Nucleation and Atmos. Aeros. ed. M. Kulmala and P.E. Wagner, Pergamon, 808-811.
Ramamurthy, M.K., C. Murphy, J. Moore, M. Wetzel, D. Knight, P. Ruscher, S. Mullen, R.
DeSouza, D.S. Hawk, and D. Fulker (1995), Teaching Mesoscale Meteorology in the Age of the
Modernized Weather Service, Bulletin, American Meteorological Society, 76, 2463-2473.
Wetzel, M.A., and G.T. Bates (1995), Comparison of Simulated Cloud Cover with Satellite
Observations Over the Western United States, J. Climate, 8, 296-314.
Wetzel, M., R. Borys, D. Lowenthal, and S. Brown (1995), Meteorological Support to the
Earthwinds Transglobal Balloon Project, Bull. Amer. Meteor. Soc., 76, 477-487.
Wetzel, M.A. (1995), Simulation of Radiances for Future AVHRR Platforms with the AVIRIS
Spectral Radiometer, Int. Jour. Remote Sensing, , 1167-1177. 16


Borys, R.D., D. Del Vecchio, J.-L. Jaffrezo, J. Dibb and D.L. Mitchell (1994), Assessment of Ice
Particle Growth Processes at Dye-3 Greenland, Atmos. Environ., 17/18, 2815-2824.
Hindman, E.E., M.A. Campbell, and R.D. Borys (1994), A 10-Winter Record of Cloud-Droplet
Physical and Chemical Properties at a Mountaintop Site in Colorado, J. Appl. Meteor., 33,
Carter, E.J., and R.D. Borys (1993), Aerosol-Cloud Chemical Fractionation: Enrichment Factor
Analysis of Cloud Water, J. Atmos. Chem., 17, 277-292.
Frisbie, P.R. and J. Hudson (1993), Urban Cloud Condensation Nuclei Spectral Flux, J. Appl.
Meteor., 32, 666-676.
Hallett, J., M. Wetzel, and S. Rutledge (1993), Field Training in Radar Meteorology, Bulletin,
Amer. Meteor. Soc., 74, 17-22.
Hindman, E.E. (1993), An Undergraduate Field Course in Meteorology and Atmospheric
Chemistry, Bull., Amer. Meteor. Soc., 74, 661-667. 1992.
Hindman, E.E., E.J. Carter, and R.D. Borys (1992), Collecting Supercooled Droplets as a
Function of Droplet Size, J. Atmos. Ocean. Tech., 9, No. 4, 337-353.
Mitchell, D.L., and R.D. Borys (1992), A Field Instrument for Examining In-Cloud Scavenging
Mechanisms by Snow. 5th International Conference on Precipitation Scavenging and
Atmosphere-Surface Exchange Processes, 15-19 July, Richland, Washington. Precipitation
Scavenging Processes, 1, 239-253.
Wetzel, M.A., and T.H. Vonder Haar (1991), Theoretical Development and Sensitivity Tests of a
Stratus Cloud Droplet Size Retrieval Method for AVHRR-K/L/M, Remote Sensing of
Environment, 36, 105-119.1990
Hallett, J., J.G. Hudson, and A. Schanot (1990), Student Training in Facilities in Atmospheric
Sciences: A Teaching Experiment, Bulletin, Amer. Meteor. Soc., 71, 1637-1641. 1989.
Miller, D.F., R.D. Borys, and R. Graw (1989), Chemistry of Summer Cloud, Precipitation and
Air at a Rocky Mountain-Top Location, Effects of Air Pollution on Western Forests, Air and
Waste Management Assoc. Trans., R.K. Olson and A.S. Lefohn, eds., 105-116. 1988.
Borys, R.D., E.E. Hindman, and P.J. DeMott (1988), The Chemical Fractionation of
Atmospheric Aerosol as a Result of Snow Crystal Formation and Growth, J. Atmos. Chem., 7,
Franc, G.D., and P.J. DeMott (1988), Activity of Aerosolized Erwinia Carotovora Cells as Cloud
Condensation Nuclei, Phytopathology, 78, 1570.

 Uttal, T., R.M. Rauber, and L.O. Grant (1988), Distributions of Liquid, Vapor, and Ice in an
Orographic Cloud from Field Observations, J. Atmos. Sci., 45, 1110-1122. 1987
Hindman, E.E. (1987), A "Cloud-Gun" Primer, J. Atmos. Ocean. Tech., 4, 736-741. 1986
Borys, R.D., D.H. Lowenthal, and K.A. Rahn (1986), Contributions of Smelters and Other
Sources to Pollution Sulfate at a Mountaintop Site in Northwestern Colorado, Acid Deposition in
Colorado -- A Potential or Current Problem; Local versus Long-Distance Transport into the
State. R. Piekle, ed., Colorado State University, Fort Collins, 167-174.
Hindman, E.E. (1986), Characteristics of Supercooled Liquid Water in Clouds at Mountaintop
Sites in the Colorado Rockies, J. Clim. Appl. Meteor., 25, 1271-1279.
Hindman, E.E. (1986), An Atmospheric Water Balance Over a Mountain Barrier, J. Clim. Appl.
Meteor., 25, 180-183.
Rauber, R.M., L.O. Grant, F. Daxiong, and J.B. Snider (1986), The Characteristics and
Distribution of Cloud Water Over the Mountains of Northern Colorado During Wintertime
Storms, Part I: Temporal Variations, J. Clim. And Appl. Meteor., 25, 468-488.
Rauber, R.M., and L.O. Grant (1986), The Characteristics and Distribution of Cloud Water Over
the Mountains of Northern Colorado During Wintertime Storms, Part II: Spatial Distribution and
Microphysical Characteristics, J. Clim. And Appl. Meteor., 25, 489-504.


Hindman, E.E., R.D. Borys, and P.J. DeMott (1983), Hydrometeorological Significance of Rime
Ice Deposits in the Colorado Rockies, Water Res. Bull., 19, 619-624.
Borys, R.D., K. Tan, and W.R. Cotton (1983), Ultralight Sounder: An Airborne System for
Studying the Planetary Boundary Layer, Bull. Amer. Meteor. Soc., 645, 338-345.
Borys, R.D., P.J. DeMott, and E.E. Hindman (1983), The Significance of Snow Crystal and
Mountain Surface Riming to the Removal of Atmospheric Trace-Constituents from Cold Clouds,
Precipitation Scavenging, Dry Deposition and Resuspension, 1, Coord., H.R. Pruppacher, R.G.
Semonin and W.G.N. Slinn, Elsevier, New York, 181-189.


Borys, R.D. (1981), Modified Mee Industries Static Thermal Gradient Diffusion Cloud Chamber,
J. Rech. Atmos., 15, 267-269.
Borys, R.D. and K.A. Rahn (1981), Long-Range Transport of Cloud-Active Aerosol to Iceland,
Atmos. Environ., 15, 1491-1501.
Borys, R.D., and K.A. Rahn (1981), Coal-Fired Power Plant Emissions of Cloud
Last Updated: 4/27/24