Tropical methane emissions: A revised view from SCIAMACHY onboard ENVISAT

被引：143

作者：

Frankenberg, Christian ^{[1
]}

Bergamaschi, Peter ^{[3
]}

Butz, Andre ^{[1
]}

Houweling, Sander ^{[1
,5
]}

Meirink, Jan Fokke ^{[2
]}

Notholt, Justus ^{[4
]}

Petersen, Anna Katinka ^{[4
]}

Schrijver, Hans ^{[1
]}

Warneke, Thorsten ^{[4
]}

Aben, Ilse ^{[1
]}

机构：

[1] SRON Netherlands Inst Space Res, NL-3584 CA Utrecht, Netherlands

[2] Royal Netherlands Meteorol Inst, NL-3730 AE De Bilt, Netherlands

[3] Commiss European Communities, Joint Res Ctr, Inst Environm & Sustainabil, I-21020 Ispra, Italy

[4] Inst Environm Phys, D-28359 Bremen, Germany

[5] Univ Utrecht, Inst Marine & Atmospher Res Utrecht, Utrecht, Netherlands

来源：

GEOPHYSICAL RESEARCH LETTERS | 2008年 / 35卷 / 15期

关键词：

D O I：

10.1029/2008GL034300

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Methane retrievals from near-infrared spectra recorded by the SCIAMACHY instrument onboard ENVISAT hitherto suggested unexpectedly large tropical emissions. Even though recent studies confirm substantial tropical emissions, there were indications for an unresolved error in the satellite retrievals. Here we identify a retrieval error related to inaccuracies in water vapor spectroscopic parameters, causing a substantial overestimation of methane correlated with high water vapor abundances. We report on the overall implications of an update in water spectroscopy on methane retrievals with special focus on the tropics where the impact is largest. The new retrievals are applied in a four-dimensional variational (4D-VAR) data assimilation system to derive a first estimate of the impact on tropical CH4 sources. Compared to inversions based on previous SCIAMACHY retrievals, annual tropical emission estimates are reduced from 260 to about 201 Tg CH4 but still remain higher than previously anticipated.

引用

页数：5

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