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Accurate mobile remote sensing of XCO₂ and XCH₄ latitudinal transects from aboard a research vessel

Klappenbach, F.; Bertleff, M.; Kostinek, J.; Hase, F.; Blumenstock, T.; Agusti-Panareda, A.; Razinger, M.; Butz, A.

Abstract:
A portable Fourier Transform Spectrometer (FTS), model EM27/SUN, is deployed onboard the research vessel Polarstern to measure the column-average dry air mole fractions of carbon dioxide (XCO2) and methane (XCH4) by means of direct sunlight absorption spectrometry. We report on technical developments as well as data calibration and reduction measures required to achieve the targeted accuracy of fractions of a percent in retrieved XCO2 and XCH4 while operating the instrument under field conditions onboard the moving platform during a six week cruise through the Atlantic from Cape Town (South Africa, 34° S, 18° E) to Bremerhaven (Germany, 54° N, 19° E). We demonstrate that our solar tracker typically achieves a tracking precision of better than 0.05° toward the center of the sun throughout the ship cruise which facilitates accurate XCO2 and XCH4 retrievals even under harsh ambient wind conditions. We define several quality filters that screen spectra e.g. when the field-of-view is partially obstructed by ship structures or when the lines-of-sight cross the ship exhaust plume. The measurements in clean oceanic air, can be used to characterize a spurious airmass dependency. ... mehr

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Volltext §
DOI: 10.5445/IR/1000049940
Originalveröffentlichung
DOI: 10.5194/amtd-8-7413-2015
Coverbild
Zugehörige Institution(en) am KIT Fakultät für Physik (PHYSIK)
Institut für Meteorologie und Klimaforschung - Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
Publikationstyp Zeitschriftenaufsatz
Jahr 2015
Sprache Englisch
Identifikator ISSN: 1867-8610
urn:nbn:de:swb:90-499406
KITopen-ID: 1000049940
HGF-Programm 12.03.01 (POF III, LK 01)
Erschienen in Atmospheric measurement techniques discussions
Band 8
Heft 7
Seiten 7413-7453
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
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