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WALES, the Airborne Demonstrator for a Water Vapor Differential Absorption LIDAR in Space

Wirth, Martin and Fix, Andreas and Groß, Silke and Kiemle, Christoph and Ehret, Gerhard (2014) WALES, the Airborne Demonstrator for a Water Vapor Differential Absorption LIDAR in Space. In: Eumetsat. EUMETSAT Climate Symposium, 13.-17.10.14, Darmstadt. ISSN 1474-7065

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Official URL: http://www.eumetsat.int

Abstract

One of the major challenges in contemporary climate research is to detect seasonal and inter-annual variabilities of water vapor for determining both the sign and the magnitude of its feedback to the Earth’s system on a global and regional scale. Here one important task is to understand and quantify the mechanisms that control moistening and dehydration of the upper troposphere / lower stratosphere from polar regions to the tropics. A key sub-task here is the investigation of the tropopause dynamics and the stratosphere-troposphere exchange processes. Further is necessary to improve our knowledge on the separation of water into gaseous and ice phases in cirrus clouds. On a more technical level it will be inevitable to provide a new, bias free reference for calibrating other remote sensing techniques, thereby unifying the global observational network for humidity in order to permit accurate regional trend analyses. All these tasks require globally available, essentially bias-free, vertically highly resolved and uncorrelated measurements of the water vapor profile. Current and possible near future space-borne passive observing systems fail to meet these requirements. The active differential absorption LIDAR (DIAL) method on the other hand has the potential to fulfill all these needs. A mission employing such an active system was proposed to ESAs Earth Explorer Program under the name WALES. As a contribution to this effort the German Aerospace Center (DLR) developed an airborne demonstrator which implements all essential features of a possible space-borne instrument, for example a multi-wavelength approach in the 935 nm absorption band of H2O and the usage of state-of-the art solid state laser technology. With this instrument a large data set has been gathered in various airborne campaigns devoted to different topics concerning the atmospheric part of the global water vapor cycle over the past years. We will present a selection of results from these campaigns and comparisons to other measurement techniques, both in-situ and remote which cover the whole troposphere up to the UTLS.

Item URL in elib:https://elib.dlr.de/91821/
Document Type:Conference or Workshop Item (Poster)
Title:WALES, the Airborne Demonstrator for a Water Vapor Differential Absorption LIDAR in Space
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Wirth, MartinDLR, IPAUNSPECIFIED
Fix, AndreasDLR, IPAUNSPECIFIED
Groß, SilkeDLR, IPAUNSPECIFIED
Kiemle, ChristophDLR, IPAUNSPECIFIED
Ehret, GerhardDLR, IPAUNSPECIFIED
Date:17 October 2014
Journal or Publication Title:Eumetsat
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
ISSN:1474-7065
Status:Published
Keywords:Water vapor Lidar, WALES mission
Event Title:EUMETSAT Climate Symposium
Event Location:Darmstadt
Event Type:international Conference
Event Dates:13.-17.10.14
Organizer:EUMETSAT
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: Kiemle, Dr.rer.nat. Christoph
Deposited On:12 Nov 2014 09:35
Last Modified:31 Jul 2019 19:49

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