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Space-borne remote sensing of CO2, CH4, and N2O by integrated path differential absorption lidar: a sensitivity analysis

Ehret, G. and Kiemle, C. and Wirth, M. and Amediek, A. and Fix, A. and Houwrling, S. (2008) Space-borne remote sensing of CO2, CH4, and N2O by integrated path differential absorption lidar: a sensitivity analysis. Applied Physics B, 90, pp. 593-608. DOI: 10.1007/s00340-007-2892-3.

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Official URL: http://www.springer.com/physics/optics/journal/340

Abstract

CO<sub>2</sub>, CH<sub>4</sub>, andN<sub>2</sub>O are recognised as the most important greenhouse gases, the concentrations of which increase rapidly through human activities. Space-borne integrated path differential absorption lidar allows global observations at day and night over land and water surfaces in all climates. In this study we investigate potential sources of measurement errors and compare them with the scientific requirements. Our simulations reveal thatmoderate-size instruments in terms of telescope aperture (0.5–1.5 m) and laser average power (0.4–4W) potentially have a low random error of the greenhouse gas column which is 0.2% for CO<sub>2</sub> and 0.4% for CH<sub>4</sub> for soundings at 1.6 μm, 0.4% for CO<sub>2</sub> at 2.1 μm, 0.6% for CH<sub>4</sub> at 2.3 μm, and 0.3% for N<sub>2</sub>O at 3.9 μm. Coherent detection instruments are generally limited by speckle noise, while direct detection instruments suffer from high detector noise using current technology. The wavelength selection in the vicinity of the absorption line is critical as it controls the height region of highest sensitivity, the temperature cross-sensitivity, and the demands on frequency stability. For CO<sub>2</sub>, an error budget of 0.08% is derived from our analysis of the sources of systematic errors. Among them, the frequency stability of ±0.3MHz for the laser transmitter and spectral purity of 99.9% in conjunction with a narrow-band spectral filter of 1 GHz (FWHM) are identified to be challenging instrument requirements for a direct detection CO<sub>2</sub> system operating at 1.6 μm.

Document Type:Article
Title:Space-borne remote sensing of CO2, CH4, and N2O by integrated path differential absorption lidar: a sensitivity analysis
Authors:
AuthorsInstitution or Email of Authors
Ehret, G.UNSPECIFIED
Kiemle, C.UNSPECIFIED
Wirth, M.UNSPECIFIED
Amediek, A.UNSPECIFIED
Fix, A.UNSPECIFIED
Houwrling, S.SRON, Utrecht, NL
Date:2008
Journal or Publication Title:Applied Physics B
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:90
DOI:10.1007/s00340-007-2892-3
Page Range:pp. 593-608
Status:Published
Keywords:simulation, satellite, differential absorption lidar, space lidar
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: Jana Freund
Deposited On:02 Jun 2008
Last Modified:20 Oct 2014 14:32

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