Upper tropospheric divergence in tropical convective systems from Meteosat-8

Upper tropospheric divergence in tropical convective systems from Meteosat-8

The upper level wind field divergence in tropical convective cloud systems is directly inferred from satellite tracked Atmospheric Motion Vectors (AMVs) using successive images at 15 minute intervals in the water vapor channel (6.2 μm) of Meteosat‐8. The use of radiances in the strongly absorbing 6....

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Veröffentlicht in:Geophysical research letters 2005-12, Vol.32 (24), p.L24804.1-n/a
Hauptverfasser: Schmetz, Johannes, Borde, Régis, Holmlund, Kenneth, König, Marianne
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Earth, ocean, space
Exact sciences and technology
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container_issue 24
container_start_page L24804.1
container_title Geophysical research letters
container_volume 32
creator Schmetz, Johannes
Borde, Régis
Holmlund, Kenneth
König, Marianne
description The upper level wind field divergence in tropical convective cloud systems is directly inferred from satellite tracked Atmospheric Motion Vectors (AMVs) using successive images at 15 minute intervals in the water vapor channel (6.2 μm) of Meteosat‐8. The use of radiances in the strongly absorbing 6.2 μm channel confines the feature tracking to the upper troposphere, enabling the derivation of consistent wind fields. A Lagrangian approach following the convective cloud systems throughout a day shows a pronounced diurnal cycle of the divergence with maximum values of 450 * 10−6 s−1. A comparison with the ECMWF forecast system shows that the forecast does not depict the observed spatial structure and does not reach the maximum values of observed divergence at the scale of tropical cloud systems. Divergence averages over the study area of about 1300 * 1400 km2 agree within a factor of two.
doi_str_mv 10.1029/2005GL024371
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source Wiley-Blackwell Journals; Wiley Online Library; Wiley-Blackwell AGU Digital Archive; EZB Electronic Journals Library
subjects Earth sciences
Earth, ocean, space
Exact sciences and technology
title Upper tropospheric divergence in tropical convective systems from Meteosat-8
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