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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

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
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
Samburova, V., Hallar, A., Lowenthal, D. H., Mazzoleni, L. R., Murray, A. E., 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 presented at the Global Fair and Workshop on Long-Term Observing Systems of Mountain Social-Ecological Systems: Reno, NV, July 16, 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., Accepted
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, Published
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, Published

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, Published
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, Published
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), Published
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, Published
Friedman, B., Zelenyuk, A., Bernek, 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, Published
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., 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, Published
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, Published
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, Published
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, Published

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, Published
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), Published
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, Published
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, Published
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., Njgaard, 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), Published
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, Published
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, Published
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
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

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