Now showing items 1-10 of 26
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 ...
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 ...
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 ...
Evaluating WRF-Chem Aerosol Indirect Effects in Southeast Pacific Marine Stratocumulus during VOCALS-REx
Author(s):Saide, P. E.; Spak, S. N.; Carmichael, G. R.; Mena-Carrasco, M. A.; Yang, Q.; Howell, S.; Leon, D. C.; Snider, Jefferson Robert; Bandy, A. R.; Collett, J. L.; Benedict, K. B.; de Szoeke, S. P.; Hawkins, L. N.; Allen, G.; Crawford, I.; Crosier, J.; Springston, S. R.
We evaluate a regional-scale simulation with the WRF-Chem model for the VAMOS (Variability of the American Monsoon Systems) Ocean-Cloud-Atmosphere-Land Study Regional Experiment (VOCALS-REx), which sampled the Southeast ...
Boundary layer turbulence and orographic precipitation growth in cold clouds : Evidence from profiling airborne radar data
Author(s):Geerts, Bart; Miao, Qun; Yang, Yang
Airborne vertically pointing Doppler radar data collected in 10 winter storms over the Medicine Bow Range in Wyoming are used to examine the importance of boundary layer (BL) turbulence for orographic precipitation growth. ...
Toward a Minimal Representation of Aerosols in Climate Models : Comparative Decomposition of Aerosol Direct, Semidirect, and Indirect Radiative Forcing
Author(s):Ghan, S. J.; Liu, Xiaohong; Easter, R. C.; Zaveri, R.; Rasch, P. J.; Yoon, J.-H.; Eaton, B.
The authors have decomposed the anthropogenic aerosol radiative forcing into direct contributions from each aerosol species to the planetary energy balance through absorption and scattering of solar radiation, indirect ...
Sensitivity Study of Radiative Fluxes at the Top of Atmosphere to Cloud-Microphysics and Aerosol Parameters in the Community Atmosphere Model CAM5, A
Author(s):Zhao, C.; Liu, Xiaohong; Qian, Y.; Yoon, J.; Hou, Z.; Lin, G.; McFarlane, S.; Wang, H.; Yang, B.; Ma, P.-L; Yan, H.; Bao, J.
In this study, we investigated the sensitivity of net radiative fluxes (FNET) at the top of atmosphere (TOA) to 16 selected uncertain parameters mainly related to the cloud microphysics and aerosol schemes in the Community ...