Now showing items 1-10 of 124
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Droplet Nucleation : Physically-Based Parameterization and Validation
Contributor:Ghan, Steven J.; Abdul-Razzak, Hayder; Nenes, Athanasios; Ming, Yi; Liu, Xiaohong; Ovchinnikov, Mikhail; Shipway, Ben; Meskhidze, Nicholas; Xu, Jun; Shi, Xiangjun
One of the greatest sources of uncertainty in simulations of climate and climate change is the influence of aerosols on the optical properties of clouds. The root of this influence is the droplet nucleation process, which ...
Single-Column Model Ensemble Approach Applied to the TWP-ICE Experiment, A
Contributor: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
Contributor: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
Contributor: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 ...
Overshooting of Clean Tropospheric Air in the Tropical Lower Stratosphere as Seen by the CALIPSO LiDAR
Contributor:Vernier, J.-P.; Pommereau, J.-P.; Thomason, L. W.; Pelon, J.; Garnier, A.; Deshler, Terry; Jumelet, J.; Nielsen, J. K.
The evolution of aerosols in the tropical upper troposphere/lower stratosphere between June 2006 and October 2009 is examined using the observations of the space borne CALIOP lidar aboard the CALIPSO satellite. Superimposed ...
Global Extent of the Mid Stratospheric CN Layer : A Three-Dimensional Modeling Study, The
Contributor:Campbell, P.; Mills, M.; Deshler, Terry
For the first time the global extent of a mid-stratospheric new particle layer is addressed, using the National Center for Atmospheric Research Community Earth System Model, version 1 (CESM1), with the high-top atmosphere ...
Novel Approach for Determining Source-Receptor Relationships in Model Simulations : A Case Study of Black Carbon Transport in Northern Hemisphere Winter, A
Contributor:Ma, P.-L.; Gattiker, J. R.; Liu, Xiaohong; Rasch, P. J.
A Gaussian process emulator is applied to quantify the contributions of local and remote emissions of black carbon to its concentrations in different regions using a Latin hypercube sampling strategy for emission perturbations ...
Assessing the CAM5 Physics Suite in the WRF-Chem Model : Implementation, Evaluation, and Resolution Sensitivity
Contributor:Ma, P.-L.; Rasch, P. J.; Fast, J. D.; Easter, R. C.; Gustafson, W. I., Jr.; Liu, Xiaohong; Ghan, S. J.; Singh, B.
A suite of physical parameterizations (deep and shallow convection, turbulent boundary layer, aerosols, cloud microphysics, and cloud fraction) from the global climate model Community Atmosphere Model version 5.1 (CAM5) ...
Improved Cirrus Simulations in a General Circulation Model Using CARMA Sectional Microphysics
Contributor: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
Contributor: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 ...