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Tropospheric Water Vapor Transport as Determined from Airborne Lidar Measurements

Schäfler, Andreas and Dörnbrack, Andreas and Kiemle, Christoph and Rahm, S. and Wirth, M. (2010) Tropospheric Water Vapor Transport as Determined from Airborne Lidar Measurements. Journal of Atmospheric and Oceanic Technology, 27, pp. 2017-2030. DOI: 10.1175/2010JTECHA1418.1.

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Official URL: http://journals.ametsoc.org/doi/abs/10.1175/2010JTECHA1418.1

Abstract

The first collocated measurements during THORPEX (The Observing System Research and Predictability Experiment) regional campaign in Europe in 2007 were performed by a novel four-wavelength differential absorption lidar and a scanning 2-mmDoppler wind lidar on board the research aircraft Falcon of the Deutsches Zentrum fuer Luft- und Raumfahrt (DLR). One mission that was characterized by exceptionally high data coverage (47% for the specific humidity q and 63% for the horizontal wind speed) was selected to calculate the advective transport of atmospheric moisture along a 1600-km section in the warm sector of an extratropical cyclone. The observations are compared with special 1-hourly model data calculated by the ECMWF integrated forecast system. Along the cross section, the model underestimates the wind speed on average by 2.8% (0.6 m/s) and overestimates the moisture at dry layers and in the boundary layer, which results in a wet bias of 17.1% (0.2 g/kg). Nevertheless, the ECMWF model reproduces quantitatively the horizontally averaged moisture transport in the warm sector. There, the superposition of high low-level humidity and the increasing wind velocities with height resulted in a deep tropospheric layer of enhanced water vapor transport. The observed moisture transport is variable and possesses a maximum of 130 g/kg m/s in the lower troposphere. The pathways of the moisture transport from southwest via several branches of different geographical origin are identified by Lagrangian trajectories and by high values of the vertically averaged tropospheric moisture transport.

Document Type:Article
Title:Tropospheric Water Vapor Transport as Determined from Airborne Lidar Measurements
Authors:
AuthorsInstitution or Email of Authors
Schäfler, Andreasandreas.schaefler@dlr.de
Dörnbrack, AndreasDLR IPA
Kiemle, ChristophDLR IPA
Rahm, S.DLR IPA
Wirth, M.DLR IPA
Date:December 2010
Journal or Publication Title:Journal of Atmospheric and Oceanic Technology
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:27
DOI:10.1175/2010JTECHA1418.1
Page Range:pp. 2017-2030
Status:Published
Keywords:airborne water vapour lidar, wind lidar, moisture transport
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben LIDAR-Forschung und -Entwicklung
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Lidar
Deposited By: Dr.rer.nat. Christoph Kiemle
Deposited On:11 Nov 2011 13:33
Last Modified:12 Dec 2013 21:24

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