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ADM-Aeolus ocean surface calibration and Level-2B processing

Kloe de, J. and Stoffelen, A. and Marseille, G. J. and Tan, D. and Isaksen, L. and Desportes, Ch. and Payan, Ch. and Dabas, A. and Huber, D. and Reitebuch, O. and Flamant, P. and Nett, H. and LeRille, O. and Straume, A.-G. (2009) ADM-Aeolus ocean surface calibration and Level-2B processing. In: Proceedings of the 8th International Symposium on Tropospheric Profiling, (S02 - ), pp. 1-4. International Symposium on Tropospheric Profiling, 18.-23. Okt. 2009, Delft, the Netherlands. ISBN 978-90-6960-233-2.

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Abstract

Preparations for the European Space Agency’s (ESA) Atmospheric Dynamics Mission (ADM-Aeolus), which is scheduled for launch in 2011, are in full progress. The direct detection high spectral resolution Doppler Wind Lidar (DWL) satellite instrument will be the first to measure wind profiles from space, from the surface up to 30 km altitude [1] and [2]. To achieve this, a laser at 355 nm pulsed at 100 Hz is pointed towards the atmosphere. Backscattered light, both from molecules and aerosols, is detected by two independent spectrometers. A dual channel Fabry-Perot spectrometer to measure both sides of the Rayleigh (molecule) spectral peak, and a high resolution Fizeau spectrometer to measure the location of the Mie (aerosol) peak. In preparation of this mission, besides the actual construction of the instrument and satellite, a number of supporting activities have been initiated by ESA, including instrument simulation and ground processing software development, ground and air-borne measurement campaigns, and studies dedicated to specific issues such as calibration and sampling strategies. An important part of the preparations is to study the possibilities of calibrating the wind results by means of surface reflections. To estimate the effect of water motion due to waves, a simple wave model has been combined with a reflectivity model of the water surface. This includes specular reflection on smooth water surfaces and Lambertian reflection on foam caused by wind streaks and breaking waves. The effect of subsurface reflection is still being investigated. Using this model, the average net water movement that will be observed by the DWL instrument is estimated. Another part of the preparations includes the development of Level 2B (i.e., wind) processing software (L2Bp). This software will accept as input measurement data files (Level 1B) and uses an estimate of the atmospheric temperature and pressure profiles (from a numerical weather prediction model) to retrieve the wind profile from the spectrometer data. This software will be made available by ESA as source code, free of charge, to all interested users in the meteorological/research community, and may be used as standalone software, or integrated as subroutine in a larger system for use in scientific or operational applications. The working of the L2Bp will be illustrated at the conference.

Document Type:Conference or Workshop Item (Poster)
Title:ADM-Aeolus ocean surface calibration and Level-2B processing
Authors:
AuthorsInstitution or Email of Authors
Kloe de, J.KNMI
Stoffelen, A.KNMI
Marseille, G. J.KNMI
Tan, D.ECMWF
Isaksen, L.ECMWF
Desportes, Ch.Meteo-France
Payan, Ch.Meteo-France
Dabas, A.Meteo-France
Huber, D.DorIT
Reitebuch, O.DLR
Flamant, P.IPSL
Nett, H.ESA
LeRille, O.ESA
Straume, A.-G.UNSPECIFIED
Date:October 2009
Journal or Publication Title:Proceedings of the 8th International Symposium on Tropospheric Profiling,
Refereed publication:Yes
In ISI Web of Science:No
Page Range:pp. 1-4
ISBN:978-90-6960-233-2
Status:Published
Keywords:ADM-Aeolus Doppler Wind Lidar
Event Title:International Symposium on Tropospheric Profiling
Event Location:Delft, the Netherlands
Event Type:international Conference
Event Dates:18.-23. Okt. 2009
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 ADM (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Lidar
Deposited By: Oliver Reitebuch
Deposited On:03 Dec 2009 17:41
Last Modified:12 Dec 2013 20:46

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