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Meridional Water Vapor Transport in Tropical and Sub-Tropical Regions

Flentje, Harald and Dörnbrack, Andreas and Ehret, Gerhard and Fix, Andreas and Schumann, Ulrich (2004) 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).

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Abstract

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:
AuthorsInstitution or Email of Authors
Flentje, HaraldUNSPECIFIED
Dörnbrack, AndreasUNSPECIFIED
Ehret, GerhardUNSPECIFIED
Fix, AndreasUNSPECIFIED
Schumann, UlrichUNSPECIFIED
Date:2004
Journal or Publication Title:HIBISCUS/TROCCINOX/TroCCiBras
Refereed publication:No
In ISI Web of Science:No
Page Range:pp. 1-4
Editors:
EditorsEmail
Held, GerhardUNSPECIFIED
Status:Published
Keywords:Water vapour, Lidar, TROCCINOX
Event Title:Workshop
Event Location:Bauru, (BRA)
Event Type:international Conference
Event Dates:2004-11-15 - 2004-11-19
Organizer:IPMet
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)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Lidar
Deposited By: Prof.Dr.habil. Ulrich Schumann
Deposited On:16 Jul 2007
Last Modified:12 Dec 2013 20:26

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