Meridional Water Vapor Transport in Tropical and Sub-Tropical Regions
Flentje, Harald and Dörnbrack, Andreas and Ehret, Gerhard and Fix, Andreas and Schumann, Ulrich
Meridional Water Vapor Transport in Tropical and Sub-Tropical Regions.
In: HIBISCUS/TROCCINOX/TroCCiBras, pp. 1-4.
Workshop, 2004-11-15 - 2004-11-19, Bauru, (BRA).
Airborne differential absorption lidar (DIAL) measurements of tropospheric water vapor and aerosol from south Europe to Brazil in mid-March 2004 are presented and compared to operational analyses of the Euro-pean Center for Medium Range Weather Forecast (ECMWF). The two 2-D sections across the tropical and sub-tropical Atlantic (5°S–37°N) reveal two different meteorological regimes. South of 20°N the Hadley circulation is evident as a humid fountain near the equator with synoptic scale inflow below 4 km (16°N) to 8 km (0°N), upper tropospheric (UT) outflow till 15°N and a dry sub-tropical subsidence layer in between. The 2nd section along the north-west African coast is controlled by mid-latitude dynamics. A deep strato-spheric intrusion is associated with the cyclonic shear along a trough from the Canary Islands towards Gi-braltar. In the sub-tropical layer and the intrusion, H2O mixing ratios q 0.01-0.1 g/kg are measured while q > 0.5 g/kg is found in the lower tropospheric air having been lifted to UT levels. The dynamical features and the water vapor mixing ratios are quite accurately analysed by the ECMWF at T511/L60 operational resolution. Largest deviations arise from shifts of structures/gradients and occasionally from assimilation inaccuracies. The averaged q-bias between both data fields is below 10%. While at mid-latitudes low water vapor regions are associated with filaments of enhanced particle backscatter, the H2O signature of the tropi-cal circulation is not correlated with the aerosol.
|Document Type:||Conference or Workshop Item (Speech)|
|Title:||Meridional Water Vapor Transport in Tropical and Sub-Tropical Regions|
|Authors||Institution or Email of Authors|
|Journal or Publication Title:||HIBISCUS/TROCCINOX/TroCCiBras|
|In ISI Web of Science:||No|
|Page Range:||pp. 1-4|
|Keywords:||Water vapour, Lidar, TROCCINOX|
|Event Location:||Bauru, (BRA)|
|Event Type:||international Conference|
|Event Dates:||2004-11-15 - 2004-11-19|
|HGF - Research field:||Aeronautics, Space and Transport (old)|
|HGF - Program:||Space (old)|
|HGF - Program Themes:||W EO - Erdbeobachtung|
|DLR - Research area:||Space|
|DLR - Program:||W EO - Erdbeobachtung|
|DLR - Research theme (Project):||W - Vorhaben LIDAR-Forschung und -Entwicklung (old)|
|Institutes and Institutions:||Institute of Atmospheric Physics > Lidar|
Prof.Dr.habil. Ulrich Schumann
|Deposited On:||16 Jul 2007|
|Last Modified:||12 Dec 2013 20:26|
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