Now showing items 11-20 of 141
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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) ...
Dust aerosol impact on North Africa climate : A GCM Investigation of Aerosol-Cloud-Radiation Interactions using A-Train Satellite Data
Author(s):Gu, Y.; Liou, K. N.; Jiang, J. H.; Su, H.; Liu, Xiaohong
The climatic effects of dust aerosols in North Africa have been investigated using the atmospheric general circulation model (AGCM) developed at the University of California, Los Angeles (UCLA). The model includes an ...
Soot Microphysical Effects on Liquid Clouds, a Multi-Model Investigation
Author(s):Koch, D.; Balkanski, Y.; Bauer, S. E.; Easter, R. C.; Ferrachat, S.; Ghan, S. J.; Hoose, C.; Iversen, T.; Kirkevåg, A.; Kristjansson, J. E.; Liu, Xiaohong; Lohmann, U.; Menon, S.; Quaas, J.; Schulz, M.; Seland, Ø.; Takemura, T.; Yan, N.
We use global models to explore the microphysical effects of carbonaceous aerosols on liquid clouds. Although absorption of solar radiation by soot warms the atmosphere, soot may cause climate cooling due to its contribution ...
Numerical study of the evolving convective boundary layer and orographic circulation around the Santa Catalina Mountains in Arizona, Part I. Circulation without deep convection, A
Author(s):Demko, J. C.; Geerts, Bart
The daytime evolution of the thermally forced boundary layer (BL) circulation over an isolated mountain, about 30 km in diameter and 2 km high, is examined by means of numerical simulations validated with data collected ...
Constraining Cloud Lifetime Effects of Aerosols using A-Train Satellite Observations
Author(s):Wang, M.; Ghan, S.; Liu, Xiaohong; L'Ecuyer, T. S.; Zhang, K.; Morrison, H.; Ovchinnikov, M.; Easter, R.; Marchand, R.; Chand, D.; Qian, Y.; Penner, J. E.
Aerosol indirect effects have remained the largest uncertainty in estimates of the radiative forcing of past and future climate change. Observational constraints on cloud lifetime effects are particularly challenging since ...
Three-Dimensional Structure of Transatlantic African Dust Transport : A New Perspective from CALIPSO LiDAR Measurements, The
Author(s):Liu, Dong; Wang, Yingjian; Wang, Zhien; Zhou, Jun
The lack of information on the vertical distribution of dust, in turn, results in large uncertainties when attempting to evaluate the impacts of dust on climate processes. We analyzed over two years of LIDAR measurements ...
Dispersion of Silver Iodide Particles from Ground-Based Generators Over Complex Terrain, Part II. WRF Large-Eddy Simulations Versus Observations, The
Author(s):Xue, Lulin; Chu, Xia; Rasmussen, Roy; Breed, Daniel; Boe, Bruce; Geerts, Bart
A numerical modeling study has been conducted to explore the ability of the Weather Research and Forecasting (WRF) model-based large-eddy simulation (LES) with 100-m grid spacing to reproduce silver iodide (AgI) particle ...
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 ...