DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Performance of a Future Spaceborne Water Vapour Lidar

Kiemle, Christoph and Ehret, Gerhard and Wirth, Martin and Fix, Andreas (2014) Performance of a Future Spaceborne Water Vapour Lidar. In: Eumetsat. EUMETSAT Climate Symposium, 13.-17.10.14, Darmstadt. ISSN 1474-7065

[img] PDF

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


Water vapor arguably lies at the heart of most key atmospheric processes. Humidity is essential for the development of severe weather, it influences, directly and indirectly through cloud formation, the planetary radiative balance, and it influences atmospheric dynamics, surface fluxes and soil moisture. Water vapor is the only radiatively important atmospheric constituent that is short‐lived and abundant enough so as to be essentially under natural control. Yet this control endows it with a strong positive feedback on climate changes driven by other influences. The latent heat of water vapor also accounts for roughly half the pole-ward, and most of the upward, heat transport within the atmosphere. Finally, water vapor dominates the net radiative cooling of the troposphere which drives convection. Despite its central importance, research to date has not led to a universally accepted picture of the factors controlling water vapor amount, a solid understanding of the mechanisms by which it influences atmospheric processes, or even precise knowledge of its concentrations in many parts of the atmosphere (Sherwood et al., Rev. Geophys. 2010). Recent advances in laser technology will enable the implementation of differential absorption lidar onboard a satellite to globally observe water vapour. In contrast to passive sounders that typically suffer from coarse vertical resolution and unknown aerosol or cloud biases, active lidar remote sensing is calibration-free and its measurement uncertainties can be precisely quantified and traded-off by adapting the spatial resolution to the particular atmospheric context and to the user needs. Results from a performance study will be presented, showing that a four-wavelength lidar, in operation as an airborne demonstrator at DLR since 2007 (Wirth et al., Appl. Phys. B 2009), will, installed onboard a low-earth orbit platform (500 km), enable water vapour profiling up to a height of 16 km in tropical, mid-latitude and arctic climates, with 1 km vertical and 100 km horizontal resolution, and less than 10 % measurement uncertainty. Spin-off products would be observations of aerosol layers and thin clouds. The instrument will measure both through optically thin clouds and above thick clouds without significant reduction in data quality. It would represent a major step forward in global humidity profiling.

Item URL in elib:https://elib.dlr.de/91820/
Document Type:Conference or Workshop Item (Poster)
Title:Performance of a Future Spaceborne Water Vapour Lidar
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Date:17 October 2014
Journal or Publication Title:Eumetsat
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:Water vapor Lidar, WALES mission
Event Title:EUMETSAT Climate Symposium
Event Location:Darmstadt
Event Type:international Conference
Event Dates:13.-17.10.14
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 09:34
Last Modified:31 Jul 2019 19:49

Repository Staff Only: item control page

Help & Contact
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.