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- Author or Editor: Bernard Pinty x
- Journal of Applied Meteorology and Climatology x
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Abstract
A method to estimate surface albedo in the African Sahel is proposed and discussed. This method, which uses METEOSAT imagery and routine surface global radiation measurement is shown to be relevant for climatological studies.
The accuracy in the estimated albedos is analysed with respect to the intervening physical parameters. It is shown that a main source of error lies in the estimate of 0.4–1.1 μm radiances from filtered METEOSAT radiances. This problem limits the expected attainable accuracy in albedo to about 10% for typical land surface albedos.
Abstract
A method to estimate surface albedo in the African Sahel is proposed and discussed. This method, which uses METEOSAT imagery and routine surface global radiation measurement is shown to be relevant for climatological studies.
The accuracy in the estimated albedos is analysed with respect to the intervening physical parameters. It is shown that a main source of error lies in the estimate of 0.4–1.1 μm radiances from filtered METEOSAT radiances. This problem limits the expected attainable accuracy in albedo to about 10% for typical land surface albedos.
Abstract
Cloud winds derived from the European geostationary satellite METEOSAT for the region of the west African monsoon are validated by DC-7 aircraft measurements for the low levels of the tropical atmosphere. Since the two sets of results are in agreement, it appears that lowest level cumuli as well as stratocumuli can be used as tracers of the actual wind field. The satellite wind fields show a large-scale circulation characterized by two opposite flows in the lower layers: the southwesterly monsoon flow near the sea surface and a northeasterly flow above, at approximately the 2000 m level.
Abstract
Cloud winds derived from the European geostationary satellite METEOSAT for the region of the west African monsoon are validated by DC-7 aircraft measurements for the low levels of the tropical atmosphere. Since the two sets of results are in agreement, it appears that lowest level cumuli as well as stratocumuli can be used as tracers of the actual wind field. The satellite wind fields show a large-scale circulation characterized by two opposite flows in the lower layers: the southwesterly monsoon flow near the sea surface and a northeasterly flow above, at approximately the 2000 m level.
