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| Titel |
Analysis of global and regional CO burdens measured from space between 2000 and 2009 and validated by ground-based solar tracking spectrometers |
| VerfasserIn |
L. Yurganov, W. McMillan, E. Grechko, A. Dzhola |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 10, no. 8 ; Nr. 10, no. 8 (2010-04-16), S.3479-3494 |
| Datensatznummer |
250008352
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| Publikation (Nr.) |
 copernicus.org/acp-10-3479-2010.pdf |
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| Zusammenfassung |
| Interannual variations in AIRS and MOPITT retrieved CO burdens are
validated, corrected, and compared with CO emissions from wild fires from
the Global Fire Emission Dataset (GFED2) inventory. Validation of daily mean
CO total column (TC) retrievals from MOPITT version 3 and AIRS version 5 is
performed through comparisons with archived TC data from the Network for
Detection of Atmospheric Composition Change (NDACC) ground-based Fourier
Transform Spectrometers (FTS) between March 2000 and December 2007. MOPITT
V3 retrievals exhibit an increasing temporal bias with a rate of 1.4–1.8% per year; thus far, AIRS retrievals appear to be more stable. For the
lowest CO values in the Southern Hemisphere (SH), AIRS TC retrievals
overestimate FTS TC by 20%. MOPITT's bias and standard deviation do not
depend on CO TC absolute values. Empirical corrections are derived for AIRS
and MOPITT retrievals based on the observed annually averaged bias versus
the FTS TC. Recently published MOPITT V4 is found to be in a good agreement
with MOPITT V3 corrected by us (with exception of 2000–2001 period). With
these corrections, CO burdens from AIRS V5 and MOPITT V3 (as well as MOPITT
V4) come into good agreement in the mid-latitudes of the Northern Hemisphere
(NH) and in the tropical belt. In the SH, agreement between AIRS and MOPITT
CO burdens is better for the larger CO TC in austral winter and worse in
austral summer when CO TC are smaller. Before July 2008, all variations in
retrieved CO burden can be explained by changes in fire emissions. After
July 2008, global and tropical CO burdens decreased until October before
recovering by the beginning of 2009. The NH CO burden also decreased but
reached a minimum in January 2009 before starting to recover. The decrease
in tropical CO burdens is explained by lower than usual fire emissions in
South America and Indonesia. This decrease in tropical emissions also
accounts for most of the change in the global CO burden. However, no such
diminution of NH biomass burning is indicated by GFED2. Thus, the CO burden
decrease in the NH could result from a combination of lower fossil fuel
emissions during the global economic recession and transport of CO-poor air
from the tropics. More extensive modeling will be required to fully resolve
this issue. |
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