Tropical methane emissions: A revised view from SCIAMACHY onboard ENVISAT
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....
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| Veröffentlicht in: | Geophysical research letters 2008-08, Vol.35 (15), p.n/a |
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| container_issue | 15 |
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| container_title | Geophysical research letters |
| container_volume | 35 |
| creator | Frankenberg, Christian Bergamaschi, Peter Butz, André Houweling, Sander Meirink, Jan Fokke Notholt, Justus Petersen, Anna Katinka Schrijver, Hans Warneke, Thorsten Aben, Ilse |
| description | 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. |
| doi_str_mv | 10.1029/2008GL034300 |
| format | Article |
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Res. Lett</addtitle><date>2008-08</date><risdate>2008</risdate><volume>35</volume><issue>15</issue><epage>n/a</epage><issn>0094-8276</issn><eissn>1944-8007</eissn><coden>GPRLAJ</coden><abstract>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. 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| language | eng |
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| source | Wiley Journals; Wiley-Blackwell AGU Digital Library; EZB-FREE-00999 freely available EZB journals; Wiley Online Library (Open Access Collection) |
| subjects | Earth sciences Earth, ocean, space Exact sciences and technology methane remote sensing SCIAMACHY |
| title | Tropical methane emissions: A revised view from SCIAMACHY onboard ENVISAT |
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