Dr. Gannet Hallar

Research Professor Atmospheric Science
47616e6e65742e48616c6c6172406472692e656475
970-819-0968
high elevation atmospheric science, cloud microphysics, Aerosols

Professional Interests

In 2003, Dr. Hallar completed her Ph.D. in the Department of Atmospheric and Oceanic Sciences at the University of Colorado at Boulder. Supported by a National Research Council Postdoctoral Fellowship, she worked at NASA Ames Research Center from 2004 – 2006. In 2006, Dr. Hallar also worked as an adjunct faculty at Santa Clara State University. Most recently as an Assistant Research Professor with the Desert Research Institute, she directs Storm Peak Laboratory, a high elevation atmospheric science facility in Steamboat Springs, Colorado. This laboratory has undergone major changes under her leadership including new instrumentation, new research foci, new field courses, and a significant building expansion. Currently, at Storm Peak Laboratory, Dr. Hallar also work as adjunct faculty for the University of Nevada, Reno and teaches a graduate level field course in Mountain Meteorology. 

The overarching theme of Dr. Hallar’s research is using high quality measurements of trace gases, aerosol physical and chemical properties, and cloud microphysics to understand connections between the biosphere, atmosphere, and climate, along with the impact of anthropogenic emissions on these connections. More specifically, currently her research uses high elevation sites, combined with airborne measurements, to study the formation processes of Cloud Condensation Nuclei (CCN) and Ice Nuclei (IN) and how differing formation processes impact mixed-phase cloud microphysics. This research topic is stemmed in many potential formation mechanisms of aerosols, including nucleation, secondary organic aerosols, and primary biological aerosol particles (PBAP’s). 

In addition to her research, Dr. Hallar leads two large National Science Foundation programs to support diversity in the atmospheric sciences. Geoscience Research at Storm Peak (GRASP) is a program providing mentoring and field research experiences for a diverse group of undergraduate students. Atmospheric Science Collaborations and Enriching NeTworks (ASCENT) is a program focusing on women in atmospheric science/meteorology to initiate positive professional relationships among female faculty of different ranks and postdoctoral researchers.

Research Areas

  • Cloud Microphysics
  • In Situ Trace Gas Measurements
  • Aerosol Optical Properties

Research Web Site

 

Education

DegreeInstitutionArea
Ph.D. University of Colorado at Boulder Atmospheric and Oceanic Sciences
M.S. University of Colorado at Boulder Atmospheric and Oceanic Sciences
B.S. Truman State University Physics

Professional Memberships

  • 2000-2013 Member, American Geophysical Union
  • 2001-2013 Member, American Meteorological Society

Publications & Presentations

2015

David, R. O., Lowenthal, D. H., Hallar, A., McCubbin, I. B., Avvallone, L., Mace, G., Wang, Z. (2015). Ice Formation and Growth in Orographically-Enhanced Mixed-Phase Clouds, Abstract EGU2015-7776, European Geosciences Union General Assembly 2015: Vienna, Austrai, April 17, 2015
Goliff, W. S., Luria, M., Blake, D. R., Zielinska, B. K., Hallar, A., Valente, R. J., Stockwell, W. R. (2015). Nighttime air quality under desert conditions, Atmos. Environ., 114, 102-111, doi: 10.1016/j.atmosenv.2015.05.041
Hallar, A., Petersen, R. C., McCubbin, I. B., Lowenthal, D. H., Lee, S., Andrews, E., Yu, F. (2015). Climatology of NewParticle Formation and Corresponding Precursors at Storm Peak Laboratory, AAQR, Accepted
Kristensen, T. B., Du, L., Nguyen, Q. T., Nojgaard, J. K., Bender Koch, C., Faurskov Nielsen, O., Hallar, A., Lowenthal, D. H., Nekat, B., van Pinxteren, D., Herrmann, H., Glasius, M., Kjaergaard, H. G., Bilde, M. (2015). Chemical Properties of HULIS from Different Environments, J. Atmos. Chem., 72, (1), 65-80

2014

Andrews, E., Ogren, J. A., Bonasoni, P., Marinoni, A., Cuevas, E., Hallar, A., et al, -. (2014). Temporal variability of aerosol properties at high altitude sites – a lag-autocorrelation analysis, 2014 Symposium on Atmospheric Chemistry and Physics at Mountain Sites: Steamboat Springs, CO, August 11, 2014
David, R. O., Lowenthal, D. H., Hallar, A. (2014). The role of mesoscale dynamics on microphysics in orographic cloud during CAMPS, Poster #223, presented at the American Meteorological Society 14th Conference on Cloud Physics and Anthony Slingo Symposium: Boston, MA, July 7, 2014
David, R. O., Lowenthal, D. H., Hallar, A., McCubbin, I. B., Avallone, L. (2014). Mountaintop Cloud Microphysical Properties: A Comparison between Storm Peak Laboratory and the University of Wyoming King Air during CAMPS, Abstract SES-137_1 presented at the Global Fair and Workshop on Long-Term Observing Systems of Mountain Social-Ecological Systems: Reno, NV, July 16, 2014
David, R. O., Lowenthal, D. H., Hallar, A., McCubbin, I. B., Avallone, L., Mace, G., Wang, Z. (2014). A Comparison between Airborne and Mountaintop Cloud Microphysics, Abstract A24C-06, 2014 AGU Fall Meeting: San Francisco, CA, December 15, 2014
Glasius, M., Hansen, A., Kristensen, K., Kristensen, T., McCubbin, I. B., Hallar, A., Petaja, T., Surratt, J. D., Worton, D. R., Kulmala, M., Goldstein, A. H. (2014). Organosulfates and Carboxylic Acids in Secondary Organic Aerosols in Coniferous Forests in Rocky Mountains (USA), Sierra Nevada Mountains (USA) and Northern Europe (Finland and Denmark), Abstract A21J-3159, (Presentation), 2014 AGU Fall Meeting: San Francisco, CA, December 15, 2014
Hallar, A. (2014). Effects of Bark Beetle Infestation on Secondary Organic Aerosol Precursors, 2014 Biogenic Hydrocarbons & the Atmosphere Gordon Research Conference: Girona, Spain, July 1, 2014
Hallar, A., Lowenthal, D. H., Clegg, S. L., Samburova, V., Taylor, N., Mazzoleni, L. R., Zielinska, B. K., Kristensen, T. B., McCubbin, I. B. (2014). Chemical, Biological, and Hygroscopic Properties of Aerosols at Storm Peak Laboratory, 2014 Symposium on Atmospheric Chemistry and Physics at Mountain Site: Steamboat Springs, CO, August 11, 2014
Hallar, A., McCubbin, I. B., Huff-Hartz, K., Heald, C., Berg, A. (2014). Effects of Mountain Pine Beetle Infestation on SOA Precursors, 2014 Symposium on Atmospheric Chemistry and Physics at Mountain Sites: Steamboat Springs, CO, August 11, 2014
Hallar, A., McCubbin, I. B., Huff-Hartz, K., Heald, C., Berg, A. (2014). Effects of Mountain Pine Beetle Infestation on Secondary Organic Aerosol Precursors in Western North America, Abstract SES-200/275, Global Fair and Workshop on Long-Term Observing Systems of Mountain Social-Ecological Systems: Reno, NV, July 16, 2014
Lowenthal, D. H., David, R. O., Borys, R. D., Hallar, A., McCubbin, I. B. (2014). Snow growth studies at Storm Peak Laboratory, Abstract SES-137_2/180 presented at the Global Fair and Workshop on Long-Term Observing Systems of Mountain Social-Ecological Systems: Reno, NV, July 16, 2014
McCubbin, I. B., Hallar, A. (2014). Overview of Scientific Activities at Storm Peak Laboratory, 2014 Symposium on Atmospheric Chemistry and Physics at Mountain Sites: Steamboat Springs, CO, August 11, 2014
McMeeking, G., Kok, G. L., Petters, M. D., Wright, T., Hader, J., McCubbin, I. B., Hallar, A., Twohy, D. W., Toohey, C. H., DeMott, P. J., McCluskey, C., Baumgardner, D. (2014). Recent florescence-based measurements of biological particles with WIBS-4A. Abstract 373, 94th AMS Meeting: Phoenix, AZ, January 4, 2014
Petzold, A., Bundke, U., Freedman, A., Onasch, T. B., Massoli, P., Andrews, E., Hallar, A. (2014). Optical closure study on light-absorbing aerosols, Geophysical Research Abstracts, 16, (EGU2014-16644), Presented at EGU General Assembly 2014, April 27, 2014-May 2, 2014
Samburova, V., Hallar, A., Lowenthal, D. H., Mazzoleni, L. R., Murray, A., Yang, X., Zielinska, B. K. (2014). Analysis of Atmospheric Biological and Organic Aerosols Collected at High Elevation Mountain Site (Storm Peak Laboratory), Abstract SES-138/216, (Presentation), Global Fair and Workshop on Long-Term Observing Systems of Mountain Social-Ecological Systems: Reno, NV, July 16, 2014
Samburova, V., Mazzoleni, L., Laskin, A., Hallar, A., Zielinska, B. K. (2014). Analysis of Water-Soluble Organic Compounds in Atmospheric Aerosols, Air and Waste Management Association 107th Annual Conference: Long Beach, CA, June 24, 2014
Samburova, V., Murray, A., Hallar, A., Yang, X., Zielinska, B. K., Siegel, B., Beres, N. D., Engelbrecht, J. P., Moosmuller, H. (2014). Analysis of Atmospheric Biological Particles with High Resolution Microscopy Techniques, Abstract 7BA.5 presented at the American Association for Aerosol Research (AAAR) 33st Annual Conference: Orlando, FL, October 20, 2014
Samburova, V., Murray, A., Yang, X., Hallar, A., Zielinska, B. K. (2014). Analysis of Organic Tracers in Atmospheric PM2.5, Air and Waste Management Association 107th Annual Conference: Long Beach, CA, June 24, 2014
Stephens, B., Watt, A. S., Burns, A., Desai, D., Bowling, J., Ehleringer, J., Lin, A., Andrews, A., Hallar, A., McCubbin, I. B. (2014). The Diurnal Cycle of Atmospheric CO2 at Mountain Locations, 2014 Symposium on Atmospheric Chemistry and Physics at Mountain Sites: Steamboat Springs, CO, August 11, 2014
Yu, F., Hallar, A. (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. Geophys. Res., 119, (21), 12246-12255, doi: 10.1002/2014JD022136
Yu, F., Hallar, A. (2014). Difference in Particle Formation at a Mountain top Location in Colorado during the Spring and Summer: Modeling and Comparison with Observations, Abstract 9NP.3, (Presentation), American Association for Aerosol Research (AAAR) 33st Annual Conference: Orlando, FL, October 20, 2014
Yu, F., Hallar, A. (2014). Implications for the role of sulfuric acid and organics in atmospheric nucleation, . Presented at the 2014 Symposium on Atmospheric Chemistry and Physics at Mountain Sites: Steamboat Springs, CO, August 11, 2014
Yu, H., Hallar, A., McCubbin, I. B., You, Y., Sedlacek, A., Springston, S., Kanawade, V. P., Lee, Y. N., Wang, J., Kuang, C., McGraw, R. L., Mikkila, J., Lee, S. H. (2014). Sub-3 nm Particles Observed at the Coastal and Continental Sites in the United States, J. Geophys. Res., 119, 860-879, doi:10.1002/2013JD02084
Zhao, Y., Hallar, A., Mazzoleni, L. R. (2014). Atmospheric organic matter in clouds: exact masses and molecular formula identification using ultrahigh resolution FT-ICR mass spectrometry, Atmos. Chem. Phys., 13, 20561-20610, doi:10.5194/acpd-13-20561-2013

2013

Amin, H. S., Russo, R. S., Sive, B., Hoebeke, E. R., Dodson, C. D., McCubbin, I. B., Hallar, A., Huff Hartz, K. E. (2013). Monoterpene emissions from bark beetle infested Engelmann spruce trees, Atmos. Environ., 72, 130-133
Asmi, A., Collaud Coen, M., Ogren, J. A., Andrews, E., Sheridan, P., Jefferson, A., Weingartner, E., Baltensperger, U., Bukowiecki, N., Lihavainen, H., Kivekas, N., Asmi, E., Aalto, P. P., Kulmala, M., Wiedensohler, A., Birmili, W., Hamed, A., O'Dowd, C., Jennings, S. G., Weller, R., Flentje, H., Fjaeraa, A. M., Fiebig, M., Lund Myhre, C., Hallar, A., Swietlicki, E., Kristensso, A., Lai, P. (2013). Aerosol decadal trends ? Part 2: In-situ aerosol particle number concentrations at GAW and ACTRIS stations, Atmos. Chem. Phys., 13, 895-916
Avallone, L., Hallar, A., Thiry, H., Edwards, L. M. (2013). Supporting the Retention and Advancement of Women in the Atmospheric Sciences: What women are saying, 94, (1), doi:10.1175/BAMS-D-12-00078, published on-line
Berg, A. R., Heald, C. L., Huff Hartz, K. E., Hallar, A., Meddens, A. J., Hicke, J. A., Lamarque, J. -., 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
Friedman, B., Zelenyuk, A., Beránek, J., Kulkarni, G., Pekour, M., Hallar, A., McCubbin, I. B., Thornton, J. A., Cziczo, D. J. (2013). Aerosol measurements at a high elevation site: composition, size, and cloud condensation nuclei activity, Atmos. Chem. Phys., 13, 11839-11851, doi: 10.5194/acp-13-11839-2013
Hallar, A. (2013). Chemical, Biological, and Hygroscopic Properties of Aerosol Organics at Storm Peak Laboratory, Presented at the Department of Atmospheric Science, Colorado State University: Fort Collins, CO, May 9, 2013
Hallar, A. (2013). Chemical, Biological, and Hygroscopic Properties of Aerosol Organics at Storm Peak Laboratory, Presented at the Department of Atmospheric and Oceanic Science, University of Wisconsin: Madison, WI, November 18, 2013
Hallar, A., Avallone, L., Thiry, H., Edwards, L. (2013). ASCENT, A Discipline Specific Model to Support the Retention and Advancement of Women in Science, American Geophysical Union Book Series, Best Practices towards Gender Parity in the Academic Science Departments, Accepted
Hallar, A., Bowers, R., McCubbin, I. B., Wiedinmyer, C., Samburova, V. (2013). Recent Primary Biological Aerosol Measurements at Storm Peak Laboratory, Presented at Department of Earth, Atmospheric and Planetary Sciences Massachusetts Institute of Technology: Cambridge, MA, January 28, 2013
Hallar, A., Lowenthal, D. H., Clegg, S. L., Samburova, V., Taylor, N., Mazzoleni, L. R., Zielinska, B. K., Kristensen, T. B., Chirokova, G., McCubbin, I. B., Dodson, C. D., Collins, D. (2013). Chemical and hygroscopic properties of aerosol organics at Storm Peak Laboratory, . J. Geophys. Res.-Atmos., 118, 4767-4779, doi: 10.1002/jgrd.50373
Marchand, R., Mace, G., Hallar, A., McCubbin, I. B., Martrosov, S., Shupe, M. (2013). Enhanced Radar Backscattering due to Oriented Ice Particles at 95 GHz during StormVEx, J. Atmos. Oceanic Technol., 30, 2336-2351, doi: 10.1175/JTECH-D-13-00005.1
Mazzoleni, L. R., Habib, D., Zhao, Y., Dalbec, M., Samburova, V., Hallar, A., Zielinska, B. K., Lowenthal, D. H. (2013). Functional Groups and Structural Insights of Water-Soluble Organic Carbon using Ultrahigh Resolution FT-ICR Tandem Mass Spectrometry, Abstract A33I-04, presented at AGU Fall Meeting: San Francisco, CA, December 9, 2013
McMeeking, G., Kok, G. L., Petters, M. D., Wright, T., Hader, J., McCubbin, I. B., Hallar, A., Twohy, C. H., Toohey, D. W., DeMott, P. J., McCluskey, C., Baumgardner, D. (2013). Real-time Measurements of Biological Particles at Several Continental Sites using the WIBS-4A, A11B-0029, Presented at 2013 AGU Fall Meeting: San Francisco, CA, December 9, 2013
Samburova, V., Hallar, A., Mazzoleni, L. R., Saranjampour, P., Lowenthal, D. H., Kohl, S. D., Zielinska, B. K. (2013). Composition of water-soluble organic carbon in nonurban atmospheric aerosol collected at the Storm Peak Laboratory, Environ. Chem, 10, 370-380, doi: 10.1071/EN13079
Samburova, V., Mazzoleni, L., Laskin, A., Hallar, A., Zielinska, B. K. (2013). Analysis of Water-Soluble Organic Compounds in Atmospheric Aerosols, Air and Waste Management Association (AWMA conference): Chicago, IL, June 25, 2014
Samburova, V., Murray, A., Hallar, A., Zielinska, B. K. (2013). Characterization of Atmospheric Biological Particles Collected at the Storm Peak Laboratory, American Association for Aerosol Research (AAAR conference): Portland, OR, October 4, 2013
Zhao, Y., Hallar, A., Mazzoleni, L. R. (2013). Atmospheric organic matter in clouds: exact masses and molecular formula identification using ultrahigh resolution FT-ICR mass spectrometry, Atmos. Chem. Phys, 13, 12343-12362
Zhao, Y., Mazzoleni, L. R., Samburova, V., Hallar, A., Zielinska, B. K., Lowenthal, D. H., Kohl, S. D. (2013). Multivariate Analysis of Water-Soluble Organic Carbon Molecular Formulas in Daily Samples, Abstract A31D-0122. Presented at AGU Fall Meeting: San Francisco, CA, December 9, 2013

2012

Amin, H., Atkins, P. T., Russo, R., Brown, A. W., Sive, B., Hallar, A., Huff Hartz, K. E. (2012). Effect of Bark Beetle Infestation on Secondary Organic Aerosol Precursor Emissions, Environ. Sci. Technol., 46, (11), 5696-5703
Andrews, E., Massoli, P., Hallar, A., Sedlacek, A., Freedman, A., Ogren, J. A., Sheridan, P. (2012). Absorption closure, European Aerosol Conference: Granada, Spain, September 2, 2012
Baustian, K. J., Cziczo, D. J., Wise, M. E., Pratt, K. A., Kulkarni, G., Hallar, A., Tolbert, M. A. (2012). Importance of aerosol composition, mixing state, and morphology for heterogeneous ice nucleation: A combined field and laboratory approach, J. Geophys. Res., 117, (D6), doi:1029/2011JD016784
Bowers, R. M., McCubbin, I. B., Fierer, N., Hallar, A. (2012). Seasonal variability in airborne bacterial communities at a high-elevation site, Atmos. Environ., 50, 41-49
Bowers, R. M., McCubbin, I. B., Hallar, A., Fierer, N. (2012). Seasonal variability in airborne bacterial communities at a high elevation site and their relationship to other air studies and to potential sources, AGU 2012 Fall Meeting: San Francisco, CA, December 3, 2012
Chirokova, G., Hallar, A., Lowenthal, D. H., McCubbin, I. B., Avallonne, L., Mace, G. G., Shupe, M., Oolman, L. D. (2012). Vertical distribution of liquid water in mixed-phase clouds from in-situ ground and airborne measurements during simultaneous CAMPS and StormVEx field campaigns, American Meteorological Society: Steamboat Springs, CO, August 20, 2012
Edwards, L., Hallar, A., Avallone, L. M., Thiry, H. (2012). ASCENT: Mentorship, Networking and Resources for Women in Atmospheric Science, Presentation, 92nd AMS Annual Meeting: New Orleans, LA, January 22, 2012
Hallar, A., Fridlind, A., Huffman, J. A. (2012). Biological Aerosol Effects on Clouds and Precipitation, EOS, Meeting Summary, December 18, 2012., 93, (51), p. 539
Hallar, A., McCubbin, I. B., Lynds, S. E., Dodson, C. (2012). Demonstrate the Model and Evaluation of Geoscience Research At Storm Peak (GRASP), a Field Research Experience Designed to Enhance Diversity in the Geosciences, Abstract ED54A-06, Presentation at AGU 2012 Fall Meeting: San Francisco, CA, December 3, 2012
Hallar, A., McCubbin, I. B., Novosselov, I., Gorder, R. (2012). A High Elevation Aerosol Manifold Modeling Study and Inter-comparison, Abstract A51A-0016, Presentation at AGU 2012 Fall Meeting: San Francisco, CA, December 3, 2012
Hansen, C., Hallar, A., Nauslar, N. J., Kaplan, M. L. (2012). Graduate Field Courses at Storm Peak Laboratory, Presentation, 15th Conference on Mountain Meteorology, August 20, 2012
Kristensen, T., Wex, H., Nekat, B., Nøjgaard, J. K., van Pinxteren, D., Lowenthal, D. H., Mazzoleni, L. R., Dieckmann, K., Koch, C. B., Mentel, T. F., Herrmann, H., Hallar, A., Stratmann, F., Bilde, M. (2012). Hygroscopic growth and CCN activity of HULIS from different environments, J. Geo. Res.- Atmospheres, 117, (D22)
Matrosov, S. Y., Mace, G. G., Marchand, R., Shupe, M. D., Hallar, A., McCubbin, I. B. (2012). Observations of Ice Crystal Habits with a Scanning Polarimetric W-Band Radar at Slant Linear Depolarization Ratio Mode, J. Atmos. Oceanic Technol., 29, 989-1008
Mazzoleni, L. R., Saranjampour, P., Dalbec, M. M., Hallar, A., Zielinska, B. K., Lowenthal, D. H., Kohl, S. D. (2012). Identification of Water-Soluble Organic Carbon in Nonurban Aerosols using Ultrahigh-Resolution FT-ICR Mass Spectrometry: Organic Anions, Environ. Chem., 9, (3), 285-297
Mazzoleni, L. R., Saranjampour, P., Dalbec, M. M., Samburova, V., Hallar, A., Zielinska, B. K., Lowenthal, D. H. (2012). Molecular Composition of Water-Soluble Organic Carbon in Nonurban Aerosols, American Association for Aerosol Research (AAAR) 31st Annual Meeting: Minneapolis, MN, October 8, 2012
Ogren, J. A., Collaud Coen, M., Asmi, A., Andrews, E., Aalto, P. P., Asmi, E., Baltensperger, U., Birmili, W., Bukowiecki, N., Day, D., Fiebig, M., Fjaeraa, A. M., Flentje, H., Hallar, A., Hamed, A., Hyvarinen, A., Jefferson, A., Jennings, S. G., Kivekas, N., Kouvarakis, G., Kulmala, M., Lihavainen, H., Lund Myhre, C., Malm, W. C., Mihapopoulos, M., Molenar, J. V., O'Dowd, C., Schichtel, B. A., Sheridan, P., Virkkula, A., Weingartner, E., Weller, R., Wiedensohler, A., Laj, P. (2012). Aerosol decadal trends: In-situ measurements of number concentration and optical properties, Submitted for oral presentation at 11th AEROCOM Workshop: Seattle, WA, September 10, 2012
Pina, A., Hallar, A., Salazar, V., Chirokova, G. (2012). Comparison of Microphysical Cloud Properties from the FSSP and CDP during CAMPS Field Campaign, 92nd American Meteorological Society Annual Meeting: New Orleans, LA, January 24, 2012

Authors

Abstract