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RISOrganization of Tropical Convection in Low Vertical Wind Shears: The Role of Cold Pools
Publisher: American Meteorological Society
Abstract: An investigation is conducted to document the role convectively generated cold pools play in determining the spatial organization of tropical deep convection. Using a high-resolution cloud-resolving model, the evolution ...
A Prognostic Parameterization for the Subgrid-Scale Variability of Water Vapor and Clouds in Large-Scale Models and Its Use to Diagnose Cloud Cover
Publisher: American Meteorological Society
Abstract: A parameterization for the horizontal subgrid-scale variability of water vapor and cloud condensate is introduced, which is used to diagnose cloud fraction in the spirit of statistically based cloud cover parameterizations. ...
Organization of Tropical Convection in Low Vertical Wind Shears: The Role of Water Vapor
Publisher: American Meteorological Society
Abstract: A modeling study is conducted to gain insight into the factors that control the intensity and organization of tropical convection, and in particular to examine if organization occurs in the absence of factors such as ...
On the Relationship between Tropical Convection and Sea Surface Temperature
Publisher: American Meteorological Society
Abstract: Tropical observations show convective activity increasing sharply above sea surface temperatures (SSTs) of around 26°C and then decreasing as the SST exceeds 30°C, with maximum observed SSTs of around 32°C.Although some ...
Seasonal Ensemble Predictions of West African Monsoon Precipitation in the ECMWF System 3 with a Focus on the AMMA Special Observing Period in 2006
Publisher: American Meteorological Society
Abstract: The West Africa monsoon precipitation of the ECMWF operational Seasonal Forecast System (SYS3) is evaluated at a lead time of 2?4 months in a 49-yr hindcast dataset, with special attention paid to the African Monsoon ...
Potential Predictability of Malaria in Africa Using ECMWF Monthly and Seasonal Climate Forecasts
Publisher: American Meteorological Society
Abstract: dealized model experiments investigate the advance warning for malaria that may be presently possible using temperature and rainfall predictions from state-of-the-art operational monthly and seasonal weather-prediction ...
Generalizing Cloud Overlap Treatment to Include Solar Zenith Angle Effects on Cloud Geometry
Publisher: American Meteorological Society
Abstract: Shortwave radiative transfer depends on the cloud field geometry as viewed from the direction of the sun. To date, the radiation schemes of large-scale models only consider a zenith view of the cloud field, and the apparent ...
An Interpretation of Cloud Overlap Statistics
Publisher: American Meteorological Society
Abstract: bservational studies have shown that the vertical overlap of cloudy layers separated by clear sky can exceed that of the random overlap assumption, suggesting a tendency toward minimum overlap. In addition, the rate of ...
Generalizing Cloud Overlap Treatment to Include the Effect of Wind Shear
Publisher: American Meteorological Society
Abstract: ix months of CloudSat and CALIPSO observations have been divided into over 8 million cloud scenes and collocated with ECMWF wind analyses to identify an empirical relationship between cloud overlap and wind shear for use ...
Sensitivity of Tropical Convection to Sea Surface Temperature in the Absence of Large-Scale Flow
Publisher: American Meteorological Society
Abstract: The response of convection to changing sea surface temperature (SST) in the absence of large-scale flow is examined, using a three-dimensional cloud resolving model. The model includes a five-category bulk microphysical ...