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RISCan Anthropogenic Aerosols Decrease the Snowfall Rate?
Publisher: American Meteorological Society
Abstract: Observations by Borys, Lowenthal, Cohn, and Brown in midlatitude orographic clouds show that for a given supercooled liquid water content, both the riming and the snowfall rates are smaller if the supercooled cloud has ...
Sensitivity Studies of the Importance of Dust Ice Nuclei for the Indirect Aerosol Effect on Stratiform Mixed-Phase Clouds
Publisher: American Meteorological Society
Abstract: New parameterizations of contact freezing and immersion freezing in stratiform mixed-phase clouds (with temperatures between 0° and ?35°C) for black carbon and mineral dust assumed to be composed of either kaolinite ...
Different Approaches for Constraining Global Climate Models of the Anthropogenic Indirect Aerosol Effect
Publisher: American Meteorological Society
Abstract: Assessments of the influence of aerosol emissions from human activities on the radiation budget, in particular via the modification of cloud properties, have been a challenge. In light of the variability to both aerosol ...
Improvement and Implementation of a Parameterization for Shallow Cumulus in the Global Climate Model ECHAM5-HAM
Publisher: American Meteorological Society
Abstract: A transient shallow-convection scheme is implemented into the general circulation model ECHAM5 and the coupled aerosol model HAM, developed at the Max Planck Institute for Meteorology in Hamburg. The shallow-convection ...
Tropical Temperature and Precipitation Responses to Large Volcanic Eruptions: Observations and AMIP5 Simulations
Publisher: American Meteorological Society
Abstract: ropical land mean surface air temperature and precipitation responses to the eruptions of El Chichón in 1982 and Pinatubo in 1991, as simulated by the atmosphere-only GCMs (AMIP) in phase 5 of the Coupled Model Intercomparison ...
Cirrus Cloud Properties as Seen by the CALIPSO Satellite and ECHAM-HAM Global Climate Model
Publisher: American Meteorological Society
Abstract: AbstractCirrus clouds impact the planetary energy balance and upper-tropospheric water vapor transport and are therefore relevant for climate. In this study cirrus clouds at temperatures colder than ?40°C simulated by the ...
When does the Saharan Air Layer impede the intensification of tropical cyclones?
Publisher: American Meteorological Society
Abstract: We investigate the circumstances under which the Saharan Air Layer (SAL) has a negative impact on the intensification of tropical cyclones (TCs) over the North Atlantic. Using hurricane tracking, aerosol optical depth (AOD) ...
Mixed-Phase Clouds: Progress and Challenges
Publisher: American Meteorological Society
Abstract: AbstractMixed-phase clouds represent a three-phase colloidal system consisting of water vapor, ice particles, and coexisting supercooled liquid droplets. Mixed-phase clouds are ubiquitous in the troposphere, occurring at ...
Simulations of a Cold Front by Cloud-Resolving, Limited-Area, and Large-Scale Models, and a Model Evaluation Using In Situ and Satellite Observations
Publisher: American Meteorological Society
Abstract: The Global Energy and Water Cycle Experiment has identified the poor representation of clouds in atmospheric general circulation models as one of the major impediments for the use of these models in reliably predicting ...