Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published January 24, 2007 | Published + Supplemental Material
Journal Article Open

Satellite chartography of atmospheric methane from SCIAMACHY on board ENVISAT: 2. Evaluation based on inverse model simulations

Abstract

We extend the analysis of a global CH_4 data set retrieved from SCIAMACHY (Frankenberg et al., 2006) by making a detailed comparison with inverse TM5 model simulations for 2003 that are optimized versus high accuracy CH_4 surface measurements from the NOAA ESRL network. The comparison of column averaged mixing ratios over remote continental and oceanic regions shows that major features of the atmospheric CH_4 distribution are consistent between SCIAMACHY observations and model simulations. However, the analysis suggests that SCIAMACHY CH_4 retrievals may have some bias that depends on latitude and season (up to ∼30 ppb). Large enhancements of column averaged CH_4 mixing ratios (∼50–100 ppb) are observed and modeled over India, Southeast Asia, and the tropical regions of South America, and Africa. We present a detailed comparison of observed spatial patterns and their seasonal evolution with TM5 1° × 1° zoom simulations over these regions. Application of a new wetland inventory leads to a significant improvement in the agreement between SCIAMACHY retrievals and model simulations over the Amazon basin during the first half of the year. Furthermore, we present an initial coupled inversion that simultaneously uses the surface and satellite observations and that allows the inverse system to compensate for the potential systematic bias. The results suggest significantly greater tropical emissions compared to either the a priori estimates or the inversion based on the surface measurements only. Emissions from rice paddies in India and Southeast Asia are relatively well constrained by the SCIAMACHY data and are slightly reduced by the inversion.

Additional Information

© 2007 American Geophysical Union. Received 7 March 2006; revised 24 May 2006; accepted 18 August 2006; published 24 January 2007. This work has been supported by the European Commission RTD projects EVERGREEN ("EnVisat for Environmental Regulation of GREENhouse gases," contract EVG1-CT-2002-00079, 5th Framework Programme) and GEMS ("Global and regional Earth-system (Atmosphere) Monitoring using Satellite and in-situ data," contract SIP4-CT-2004-516099, 6th Framework Programme). We thank Giacomo Grassi and Adrian Leip for detailed discussions on CH_4 emissions from plants. We are grateful to A. Segers for his assistance in preprocessing the ECMWF meteorological data as TM5 input.

Attached Files

Published - Bergamaschi_et_al-2007-Journal_of_Geophysical_Research_D02304.pdf

Supplemental Material - jgrd13039-sup-0001-readme.txt

Supplemental Material - jgrd13039-sup-0002-txts01.txt

Supplemental Material - jgrd13039-sup-0003-fs01a.tiff

Supplemental Material - jgrd13039-sup-0004-fs01b.tiff

Supplemental Material - jgrd13039-sup-0005-fs01c.tiff

Supplemental Material - jgrd13039-sup-0006-fs01d.tiff

Supplemental Material - jgrd13039-sup-0007-fs01e.tiff

Supplemental Material - jgrd13039-sup-0008-fs01f.tiff

Supplemental Material - jgrd13039-sup-0009-fs02.tiff

Supplemental Material - jgrd13039-sup-0010-fs03a.tiff

Supplemental Material - jgrd13039-sup-0011-fs03b.tiff

Supplemental Material - jgrd13039-sup-0012-fs03c.tiff

Supplemental Material - jgrd13039-sup-0013-fs04.tiff

Supplemental Material - jgrd13039-sup-0014-fs05.tiff

Supplemental Material - jgrd13039-sup-0015-fs06.tiff

Supplemental Material - jgrd13039-sup-0016-fs07a.tiff

Supplemental Material - jgrd13039-sup-0017-fs07b.tiff

Supplemental Material - jgrd13039-sup-0018-fs07c.tiff

Supplemental Material - jgrd13039-sup-0019-fs07d.tiff

Supplemental Material - jgrd13039-sup-0020-fs08.tiff

Supplemental Material - jgrd13039-sup-0021-fs09.tiff

Supplemental Material - jgrd13039-sup-0022-t01.txt

Supplemental Material - jgrd13039-sup-0023-t02.txt

Supplemental Material - jgrd13039-sup-0024-t03.txt

Files

Bergamaschi_et_al-2007-Journal_of_Geophysical_Research_D02304.pdf
Files (14.1 MB)
Name Size Download all
md5:c5ffb2d76612ce58a8170456930a1023
2.1 MB Preview Download
md5:d1dfd5f590b4f59f703e750fef7bc757
1.1 MB Preview Download
md5:2f4c323ab13ac29b2c0e1bf5a53db9bf
6.8 kB Preview Download
md5:f2ecaba3c26af702e7535f240b42544a
483.4 kB Preview Download
md5:da91c93540cbf2b813719d79d112156a
466.6 kB Preview Download
md5:5f8c91e61304b0914e711d79c558395b
5.4 kB Preview Download
md5:ff5d4f81db59391aeb77baec5ecda290
271.2 kB Preview Download
md5:286dde5113a60bc764ba99e4a09d364e
5.4 kB Preview Download
md5:5b851ac73ae1418f3b85ee174e8c5005
1.1 MB Preview Download
md5:73a8a9e48ff4939387f92f4bcbdf505e
1.2 MB Preview Download
md5:88f2d798805b281941404354b8bd96a3
381.5 kB Preview Download
md5:a9f52c84997d8dcac50548e0d2dcd9a1
271.1 kB Preview Download
md5:454ce70555f23fa63954085c0756396b
1.1 MB Preview Download
md5:9e46b012f1ba876bbf22b3af60092f7c
436.5 kB Preview Download
md5:a8d659b0723b45d41f41ee9dbb1d45c6
948.9 kB Preview Download
md5:244ebef032bcc1e2ce51d4783daa42e2
581.6 kB Preview Download
md5:fe0265c8a93e2ec07e98f1b46d1be8f0
838.7 kB Preview Download
md5:1e44f0cf9f8f449e8a13a153c676f8e0
1.2 MB Preview Download
md5:2992135603dc734ef4045c69d9c8652f
359.5 kB Preview Download
md5:158b647e063fdd7ba2cf77976072f2e8
268.8 kB Preview Download
md5:69f24cbd2f72b8931d7c8342c9ff0ca0
126.0 kB Preview Download
md5:c4d810ebd1da473ff9a328318e95e10f
302.2 kB Preview Download
md5:97aa0dcfa58a6d52134576c9017580ba
516.9 kB Preview Download
md5:262ee7df1c325eff5f5e0bbb4b03760e
2.7 kB Preview Download
md5:b6aa9a0421c702acb1fe2059b4233746
827 Bytes Preview Download

Additional details

Created:
August 22, 2023
Modified:
October 23, 2023