New Perspectives on Land-Atmosphere Feedbacks from the African Monsoon Multidisciplinary Analysis AMMAReport as inadecuate




New Perspectives on Land-Atmosphere Feedbacks from the African Monsoon Multidisciplinary Analysis AMMA - Download this document for free, or read online. Document in PDF available to download.

1 CEH - Centre for Ecology and Hydrology Wallingford 2 SEE - School of Earth and Environment Leeds 3 IMK - Institut für Meteorologie und Klimaforschung 4 Environmental Sciences Faculty 5 CRC - Centre de Recherches de Climatologie 6 SPACE - LATMOS LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales 7 CNRM-GAME - Groupe d-étude de l-atmosphère météorologique 8 ECMWF - European Centre for Medium-Range Weather Forecasts 9 Institute of Biometeorology 10 CRC - Centro di ricerca sul clima e i cambiamenti climatici 11 LTHE - Laboratoire d-étude des transferts en hydrologie et environnement 12 IRD, Centre Niamey, Niger 13 LMD - Laboratoire de Météorologie Dynamique

Abstract : Research into land-atmosphere coupling within AMMA has highlighted the atmospheric impact of soil moisture on space scales of 5 km upwards and time scales of several days. Observational and modelling studies have shown how antecedent rainfall patterns affect new storms in the Sahel. The land feedback operates through various mechanisms, including a direct link to afternoon storm initiation from surface-induced mesoscale circulations, and indirectly via large-scale moisture transport in the nocturnal monsoon. The results suggest potential for significant improvements in weather forecasting through assimilation of satellite data. Intriguing questions remain about the importance of vegetation memory on seasonal-interannual scales.

Keywords : Planetary Boundary Layer Soil moisture Convection





Author: Christopher M. Taylor - Douglas J. Parker - Norbert Kalthoff - Miguel Angel Gaertner - Nathalie Philippon - Sophie Bastin - Phil

Source: https://hal.archives-ouvertes.fr/



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