Now showing items 1-10 of 22
Single-Column Model Ensemble Approach Applied to the TWP-ICE Experiment, A
Author(s):Davies, L.; Jakob, C.; Cheung, K.; Del Genio, A.; Hill, A.; Hume, T.; Keane, R. J.; Komori, T.; Larson, V. E.; Lin, Y.; Liu, Xiaohong; Nielsen, B. J.; Petch, J.; Plant, R. S.; Singh, M. S.; Shi, X.; Song, X.; Wang, W.; Whitall, M. A.; Wolf, A.; Xie, S.; Zhang, G.
Single-column models (SCM) are useful test beds for investigating the parameterization schemes of numerical weather prediction and climate models. The usefulness of SCM simulations are limited, however, by the accuracy of ...
In Situ Chemical Characterization of Aged Biomass-Burning Aerosols Impacting Cold Wave Closss
Author(s):Pratt, K. A.; Heymsfield, A. J.; Twohy, C. H.; Murphy, Shane; Demott, P. J.; Hudson, James G.; Subramanian, R.; Wang, Zhein; Seinfield, John H.; Prather, K. A.
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. ...
Ice Initiation by Aerosol Particles : Measured and Predicted Ice Nuclei Concentrations Versus Measured Ice Crystal Concentrations in an Orographic Wave Cloud
Author(s):Eidhammer, T.; DeMott, P. J.; Prenni, A. J.; Petters, M. D.; Twohy, C. H.; Rogers, D. C.; Stith, J.; Heymsfield, A.; Wang, Z.; Pratt, K. A.; Prather, K. A.; Murphy, Shane; Seinfeld, J. H.; Subramanian, R.; Kreidenweis, S. M.
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 ...
Improved Cirrus Simulations in a General Circulation Model Using CARMA Sectional Microphysics
Author(s):Bardeen, C. G.; Gettelman, A.; Jensen, E.J.; Heymsfield, A.; Conley, A. J.; Delanoë, J.; Deng, Min; Toon, O. B.
We have developed a new cirrus model incorporating sectional ice microphysics from the Community Aerosol and Radiation Model for Atmospheres (CARMA) in the latest version of NCAR's Community Atmosphere Model (CAM5). ...
Relationships Between Ice Water Content and Volume Extinction Coefficient from in Situ Observations for Temperatures from 0° to -86°C : Implications for Spaceborne Iidar Retrievals
Author(s):Heymsfield, A.; Winker, D.; Avery, M.; Vaughan, M.; Diskin, G.; Deng, Min; Mitev, V.; Matthey, R.
An examination of 2 yr of Cloud-Aerosol Lidar Infrared Pathfinder Satellite Observations (CALIPSO) lidar observations and CloudSat cloud radar observations shows that ice clouds at temperatures below about -45°C frequently ...
Climate Impacts of Ice Nucleation
Author(s):Gettelman, A.; Liu, Xiaohong; Barahona, D.; Lohmann, U.; Chen, C.
Several different ice nucleation parameterizations in two different General Circulation Models (GCMs) are used to understand the effects of ice nucleation on the mean climate state, and the Aerosol Indirect Effects (AIE) ...
Resurgence in Ice Nuclei Measurement Research
Author(s):De Mott, P. J.; Möhler, O.; Stetzer, O.; Vali, Gabor; Vali, G.; Levin, Z.; Petters, M. D.; Murakami, M.; Leisner, T.; Bundke, U.; Klein, H.; Kanji, Z. A.; Cotton, R.; Jones, Hazel; Benz, S.; Brinkmann, M.; Rzesanke, D.; Saathoff, H.; Nicolet, M.; Saito, A.; Nillius, B.; Bingemer, H.; Abbatt, J.; Ardon, K.; Ganor, E.; Georgakopoulos, D. G.; Saunders, C.
The accuracy and precision of current ice nuclei (IN) instruments is reported and progress made toward addressing apparent shortfalls in past ice nuclei measurements is studied. Most new IN instruments can measure at ...
Intercomparison of the Cloud Water Phase Among Global Climate Models
Author(s):Komurcu, M.; Storelvmo, T.; Tan, I.; Lohmann, U.; Yun, Y.; Penner, J. E.; Wang, Y.; Liu, Xiaohong; Takemura, T.
Mixed-phase clouds (clouds that consist of both cloud droplets and ice crystals) are frequently present in the Earth's atmosphere and influence the Earth's energy budget through their radiative properties, which are highly ...
Observation of Playa Salts as Nuclei in Orographic Wave Clouds
Author(s):Pratt, K. A.; Twohy, C. H.; Murphy, Shane; Moffet, R. C.; Heymsfield, A. J.; Gaston, C. J.; Demott, P. J.; Field, P. R.; Henn, T. R.; Rogers, D. C.; Gilles, M. K.; Seinfeld, J. H.; Prather, K. A.
During the Ice in Clouds Experiment-Layer Clouds (ICE-L), dry lakebed, or playa, salts from the Great Basin region of the United States were observed as cloud nuclei in orographic wave clouds over Wyoming. Using a counterflow ...
Representation of Arctic Mixed-Phase Clouds and the Wegener-Bergeron- Findeisen Process in Climate Models : Perspectives from a Cloud-Resolving Study
Author(s):Fan, J.; Ghan, S.; Ovchinnikov, M.; Liu, Xiaohong; Rasch, P. J.; Korolev, A.
Two types of Arctic mixed-phase clouds observed during the ISDAC and M-PACE field campaigns are simulated using a 3-dimensional cloud-resolving model (CRM) with size-resolved cloud microphysics. The modeled cloud properties ...