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

Ehret, G. und Kiemle, C. und Wirth, M. und Amediek, A. und Fix, A. und 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, Seiten 593-608. DOI: 10.1007/s00340-007-2892-3.

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

Kurzfassung

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.

Dokumentart:Zeitschriftenbeitrag
Titel:Space-borne remote sensing of CO2, CH4, and N2O by integrated path differential absorption lidar: a sensitivity analysis
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Ehret, G.NICHT SPEZIFIZIERT
Kiemle, C.NICHT SPEZIFIZIERT
Wirth, M.NICHT SPEZIFIZIERT
Amediek, A.NICHT SPEZIFIZIERT
Fix, A.NICHT SPEZIFIZIERT
Houwrling, S.SRON, Utrecht, NL
Datum:2008
Erschienen in:Applied Physics B
Referierte Publikation:Ja
In Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:90
DOI :10.1007/s00340-007-2892-3
Seitenbereich:Seiten 593-608
Status:veröffentlicht
Stichwörter:simulation, satellite, differential absorption lidar, space lidar
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EO - Erdbeobachtung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben LIDAR-Forschung und -Entwicklung (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Lidar
Hinterlegt von: Jana Freund
Hinterlegt am:02 Jun 2008
Letzte Änderung:20 Okt 2014 14:32

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