Index Catalog // ScholarsArchive@OSU

Ice nucleation processes in upper tropospheric wave-clouds observed during SUCCESS

Creator:: Jensen, E. J., Toon, O. B., Tabazadeh, A., Sachse, G. W., Andersen, B. E., Chan, K. R., Twohy, Cynthia, Gandrud, Bruce W., Aulenbach, S. M., Heymsfield, Andrew J., Hallett, J., and Gary, B.
Abstract:: We have compared in situ measurements near the leading-edges of wave-clouds observed during the SUCCESS experiment with numerical simulations. Observations of high supersaturations with respect to ice (> 50%) near the leading edge of a very cold wave cloud (T < -60°C) are approximately consistent with recent theoretical and laboratory...
Resource Type:: Article
Full Text:: . Gandrud 4, S. M. Aulenbach 4, A. Heymsfield 4, J. Hallett 5, and B. Gary 6 Abstract. We have compared

Refinements to Ice Particle Mass Dimensional and Terminal Velocity Relationships for Ice Clouds. Part I: Temperature Dependence

Creator:: Heymsfield, Andrew J., Bansemer, Aaron, and Twohy, Cynthia
Abstract:: This two-part study attempts to find appropriate mass dimension and terminal velocity relationships that, when considered together with particle size distributions (PSD), agree with coincident measurements of ice water content (IWC), and with variables related to higher moments such as the mean mass-weighted fall speed. Reliable relationships are required for...
Resource Type:: Article
Full Text:: Velocity Relationships for Ice Clouds. Part I: Temperature Dependence ANDREW J. HEYMSFIELD AND AARON

Examinations of ice formation processes in Florida cumuli using ice measurements of anvil ice crystal particle residues

Creator:: Prenni, Anthony J., DeMott, Paul J., Twohy, Cynthia, Poellot, Michael R., Kreidenweis, Sonia M., Rogers, David C., Brooks, Sarah D., Richardson, Matthew S., and Heymsfield, Andrew J.
Abstract:: A continuous flow diffusion chamber (CFDC) was used to measure ice formation by cloud particle residuals during the Cirrus Regional Study of Tropical Anvils and Cirrus Layers-Florida Area Cirrus Experiment. These measurements were directed toward determining the relative contributions of homogeneous nucleation, heterogeneous nucleation, and secondary ice formation processes to...
Resource Type:: Article
Full Text:: cumuli using ice nuclei measurements of anvil ice crystal particle residues Anthony J. Prenni,1 Paul J

Uptake of NOy on wave-cloud ice particles

Creator:: Weinheimer, A. J., Campos, T. L., Walega, J. G., Grahek, F. E., Ridley, B. A., Baumgardner, D., Twohy, Cynthia, Gandrud, Bruce W., and Jensen, E. J.
Abstract:: In flight through a wave cloud during SUCCESS on 2 May 1996, simultaneous forward- and aft- facing NOy inlets were used to infer the amount of condensed-phase NOy present on ice particles that were up to a few minutes old. Condensed-phased amounts were 25-75 pptv, or 10-20% of gas-phase NOy....
Resource Type:: Article
Full Text:: . Anderson, K.R. Chan, D. Barongardner, C. Twohy, B. Gandrud, A.J. Heymsfield, J. Hallett, and B. Gary, Ice

Measurement of Condensed Water Content in Liquid and Ice Clouds Using an Airborne Counterflow Virtual Impactor

Creator:: Twohy, Cynthia, Schanot, Allen J., and Cooper, William A.
Abstract:: Condensed water content (CWC) measured using a counterflow virtual impactor (CVI) with a Lyman-α hygrometer downstream is compared with that measured by other airborne instruments (a hot-wire probe, a PMS FSSP, and a PMS 2D-C). Results indicate that the CVI system provides a reliable measurement of CWC in both liquid-...
Resource Type:: Article
Full Text:: Engineering, Laramie, WY 82071.] Gardiner, B. A., and J. Hallett, 1985: Degradation of in-cloud forward

Improvements to an Empirical Parameterization of Heterogeneous Ice Nucleation and Its Comparison with Observations

Creator:: Phillips, Vaughan T. J., Demott, Paul J., Andronache, Constantin, Pratt, Kerri A., Prather, Kimberly A., Subramanian, R., and Twohy, Cynthia
Abstract:: A framework for an empirical parameterization (EP) of heterogeneous nucleation of ice crystals by multiple species of aerosol material in clouds was proposed in a 2008 paper by the authors. The present paper reports improvements to specification of a few of its empirical parameters. These include temperatures for onset of...
Resource Type:: Article
Full Text:: of Heterogeneous Ice Nucleation and Its Comparison with Observations VAUGHAN T. J. PHILLIPS,* PAUL J

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:: . Soc., 114, 145–164, 1988. Gardiner, B. A., and J. Hallett, Degradation of in-cloud forward scattering

Relationships of Biomass-Burning Aerosols to Ice in Orographic Wave Clouds

Creator:: Twohy, Cynthia, DeMott, Paul J., Pratt, Kerri A., Subramanian, R., Kok, Gregory L., Murphy, Shane M., Lersch, Traci, Heymsfield, Andrew J., Wang, Zhien, Prather, Kim A., and Seinfeld, John H.
Abstract:: Ice concentrations in orographic wave clouds at temperatures between −24° and −29°C were shown to be related to aerosol characteristics in nearby clear air during five research flights over the Rocky Mountains. When clouds with influence from colder temperatures were excluded from the dataset, mean ice nuclei and cloud ice...
Resource Type:: Article
Full Text:: Ice in Orographic Wave Clouds CYNTHIA H. TWOHY,* PAUL J. DEMOTT,1 KERRI A. PRATT,# R. SUBRAMANIAN

Ice Initiation by Aerosol Particles: Measured and Predicted Ice Nuclei Concentrations versus Measured Ice Crystal Concentrations in an Orographic Wave Cloud

Creator:: Eidhammer, T., DeMott, P. J., Prenni, A. J., Petters, M. D., Twohy, Cynthia, Rogers, D. C., Stith, J., Heymsfield, A., Wang, Z., Pratt, K. A., Prather, K. A., Murphy, S. M., Seinfeld, J. H., Subramanian, R., and Kreidenweis, S. M.
Abstract:: The initiation of ice in an isolated orographic wave cloud was compared with expectations based on ice nucleating aerosol concentrations and with predictions from new ice nucleation parameterizations applied in a cloud parcel model. Measurements of ice crystal number concentrations were found to be in good agreement both with measured...
Resource Type:: Article
Full Text:: Wave Cloud T. EIDHAMMER,a,b P. J. DEMOTT,b A. J. PRENNI,b M. D. PETTERS,b,c C. H. TWOHY,d D. C. ROGERS

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:: Evolution of a Florida Cirrus Anvil T. J. GARRETT,a B. C. NAVARRO

ScholarsArchive@OSU

Ice nucleation processes in upper tropospheric wave-clouds observed during SUCCESS

Refinements to Ice Particle Mass Dimensional and Terminal Velocity Relationships for Ice Clouds. Part I: Temperature Dependence

Examinations of ice formation processes in Florida cumuli using ice measurements of anvil ice crystal particle residues

Uptake of NOy on wave-cloud ice particles

Measurement of Condensed Water Content in Liquid and Ice Clouds Using an Airborne Counterflow Virtual Impactor

Improvements to an Empirical Parameterization of Heterogeneous Ice Nucleation and Its Comparison with Observations

Small, highly reflective ice crystals in low-latitude cirrus

Relationships of Biomass-Burning Aerosols to Ice in Orographic Wave Clouds

Ice Initiation by Aerosol Particles: Measured and Predicted Ice Nuclei Concentrations versus Measured Ice Crystal Concentrations in an Orographic Wave Cloud

Evolution of a Florida Cirrus Anvil

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