Index Catalog // ScholarsArchive@OSU

Small, highly reflective ice crystals in low-latitude cirrus

Creator:: Garrett, T. J., Gerber, H., Baumgardner, D. G., Twohy, Cynthia, and Weinstock, E. M.
Abstract:: At low latitudes, cirrus are ubiquitous and can be in excess of 100°C colder than the surface, limiting the amount of sunlight absorbed by the earth’s atmosphere and surface, and reducing its loss of heat. Here we present aircraft measurements within cirrus over southern Florida indicating that ice crystals have...
Resource Type:: Article
Full Text:: -latitude cirrus T. J. Garrett,1 H. Gerber,2 D. G. Baumgardner,3 C. H. Twohy,4 and E. M. Weinstock5

Measurements of wave-cloud microphysical properties with two new aicraft probes

Creator:: Gerber, H., Twohy, Cynthia, Gandrud, Bruce W., Heymsfield, Andrew J., McFarquhar, Greg M., DeMott, Paul J., and Rogers, David C.
Abstract:: Measurements of ice water content (IWC) and mean ice-crystal size and concentration made by two in-situ probes, C, VI and PVM, were compared on the DC-8 aircraft during SUCCESS flights in orographic ice clouds. The comparison of 1WC in these wave clouds, that formed at temperatures of about -38 °C...
Resource Type:: Article
Full Text:: , 1998 Measurements of wave-cloud microphysical properties with two new aircraft probes H. Gerber

Evolution of a Florida Cirrus Anvil

Creator:: Garrett, T. J., Navarro, B. C., Twohy, Cynthia, Jensen, E. J., Baumgardner, D. G., Bui, P. T., Gerber, H., Herman, A. J., Heymsfield, P., Lawson, P., Minnis, P., Nguyen, L., Poellot, M., Pope, S. K., Valero, F. P. J., and Weinstock, E. M.
Abstract:: This paper presents a detailed study of a single thunderstorm anvil cirrus cloud measured on 21 July 2002 near southern Florida during the Cirrus Regional Study of Tropical Anvils and Cirrus Layers–Florida Area Cirrus Experiment (CRYSTAL-FACE). NASA WB-57F and University of North Dakota Citation aircraft tracked the microphysical and radiative...
Resource Type:: Article
Full Text:: ,a C. H. TWOHY,b E. J. JENSEN,c D. G. BAUMGARDNER,d P. T. BUI,c H. GERBER,e R. L. HERMAN,f A. J

In Situ Chemical Characterization of Aged Biomass-Burning Aerosols Impacting Cold Wave Clouds

Creator:: Pratt, Kerri A., Heymsfield, Andrew J., Twohy, Cynthia, Murphy, Shane M., DeMott, Paul J., Hudson, James G., Subramanian, R., Wang, Zhien, Seinfeld, John H., and Prather, Kimberly A.
Abstract:: During the Ice in Clouds Experiment–Layer Clouds (ICE-L), aged biomass-burning particles were identified within two orographic wave cloud regions over Wyoming using single-particle mass spectrometry and electron microscopy. Using a suite of instrumentation, particle chemistry was characterized in tandem with cloud microphysics. The aged biomass-burning particles comprised ~30%–40% by number...
Resource Type:: Article
Full Text:: Biomass-Burning Aerosols Impacting Cold Wave Clouds KERRI A. PRATT,a,b ANDREW J. HEYMSFIELD,c CYNTHIA H

Effective Radius of Ice Cloud Particle Populations Derived from Aircraft Probes

Creator:: Heymsfield, Andrew J., Schmitt, Carl, Bansemer, Aaron, van Zadelhoff, Gerd-Jan, McGill, Matthew J., Twohy, Cynthia, and Baumgardner, Darrel
Abstract:: The effective radius (r[subscript]e) is a crucial variable in representing the radiative properties of cloud layers in general circulation models. This parameter is proportional to the condensed water content (CWC) divided by the extinction (σ). For ice cloud layers, parameterizations for r[subscript]e have been developed from aircraft in situ measurements...
Resource Type:: Article
Full Text:: discrepancy, H. Gerber (2004, per- sonal communication) evaluated the calibration of the CIN using a

In Situ, Airborne Instrumentation: Addressing and Solving Measurement Problems in Ice Clouds

Creator:: Baumgardner, D., Avallone, L., Bansemer, A., Borrmann, S., Brown, P., Bundke, U., Chuang, P. Y., Cziczo, D., Field, P., Gallagher, M., Gayet, J.-F., Heymsfield, A., Korolev, A., Kraemer, M., McFarquhar, G., Mertes, S., Moehler, O., Lance, S., Lawson, P., Petters, M. D., Pratt, K., Roberts, G., Rogers, D., Stetzer, O., Stith, J., Strapp, W., Twohy, Cynthia, and Wendisch, M.
Abstract:: No abstract available.
Resource Type:: Article
Full Text:: , 451–459, doi:10.1007/s00585-997-0451. Gerber, H., Y. Takano, T. J. Garrett, and P. V. Hobbs, 2000

Comparison of in situ measurements of cirrus cloud ice water content

Creator:: Davis, Sean M., Avallone, Linnea M., Weinstock, Elliot M., Twohy, Cynthia, Smith, Jessica B., and Kok, Gregory L.
Abstract:: Aircraft-based in situ measurements of cirrus cloud ice water content (IWC) are important for cloud microphysical/radiative modeling and satellite validation studies, yet the measurements have proven challenging due, in part, to the large dynamic range of IWC values present in cirrus clouds. To date, three instruments designed for the measurement...
Resource Type:: Article
Full Text:: cloud ice water content Sean M. Davis,1 Linnea M. Avallone,1 Elliot M. Weinstock,2 Cynthia H. Twohy,3

The role of heterogeneous freezing nucleation in upper troposphereic clouds : inferences from SUCCESS

Creator:: DeMott, Paul J., Rogers, David C., Kreidenweis, Sonia M., Chen, Yalei, Twohy, Cynthia, Heymsfield, Andrew J., Chan, K. Roland, and Baumgardner, Darrel
Abstract:: A temperature spectrum if heterogeneous freezing nuclei concentrations in continental air in the upper troposphere was determined based on airborne measurements. Numerical model simulations incorporating ice formation by heterogeneous and homogeneous freezing of deliquesced soluble aerosol particles were performed to investigate the effect of the heterogeneous freezing nuclei were predicted...
Resource Type:: Article
Full Text:: ) gave excellent agreement with observations (H. Gerber, personal communication, 1997]. Two

Performance of a Counterflow Virtual Impactor in the NASA Icing Research Tunnel

Creator:: Twohy, Cynthia, Strapp, J. W., and Wendisch, M.
Abstract:: A counterflow virtual impactor (CVI) designed for aircraft use was evaluated at the NASA Icing Research Tunnel in Cleveland, Ohio. Tests were conducted for tunnel speeds of 67 and 100 m s⁻¹, for liquid water contents of 0.23–1.4 g m⁻³, and for a wide range of droplet median volume diameters...
Resource Type:: Article
Full Text:: - certainty Analysis for Engineers. John Wiley and Sons, 2d ed. 275 pp. Gerber, H., C. H. Twohy, B. Gandrud

Ice in Clouds Experiment—Layer Clouds. Part I: Ice Growth Rates Derived from Lenticular Wave Cloud Penetrations

Creator:: Heymsfield, Andrew J., Field, Paul R., Bailey, Matt, Rogers, Dave, Stith, Jeffrey, Twohy, Cynthia, Wang, Zhien, and Haimov, Samuel
Abstract:: Lenticular wave clouds are used as a natural laboratory to estimate the linear and mass growth rates of ice particles at temperatures from -20° to -32°C and to characterize the apparent rate of ice nucleation at water saturation at a nearly constant temperature. Data are acquired from 139 liquid cloud...
Resource Type:: Article
Full Text:: . O. Box 3000, Boulder, CO 80307. E-mail: heyms1@ucar.edu 2628 J O U R N A L O F T H E A T M O S P

ScholarsArchive@OSU

Small, highly reflective ice crystals in low-latitude cirrus

Measurements of wave-cloud microphysical properties with two new aicraft probes

Evolution of a Florida Cirrus Anvil

In Situ Chemical Characterization of Aged Biomass-Burning Aerosols Impacting Cold Wave Clouds

Effective Radius of Ice Cloud Particle Populations Derived from Aircraft Probes

In Situ, Airborne Instrumentation: Addressing and Solving Measurement Problems in Ice Clouds

Comparison of in situ measurements of cirrus cloud ice water content

The role of heterogeneous freezing nucleation in upper troposphereic clouds : inferences from SUCCESS

Performance of a Counterflow Virtual Impactor in the NASA Icing Research Tunnel

Ice in Clouds Experiment—Layer Clouds. Part I: Ice Growth Rates Derived from Lenticular Wave Cloud Penetrations

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