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| Titel |
First year of upper tropospheric integrated content of CO2 from IASI hyperspectral infrared observations |
| VerfasserIn |
C. Crevoisier, A. Chédin, H. Matsueda, T. Machida, R. Armante, N. A. Scott |
| 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 ; 9, no. 14 ; Nr. 9, no. 14 (2009-07-21), S.4797-4810 |
| Datensatznummer |
250007515
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| Publikation (Nr.) |
 copernicus.org/acp-9-4797-2009.pdf |
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| Zusammenfassung |
| Simultaneous observations from the Infrared Atmospheric Sounding
Interferometer (IASI) and from the Advanced Microwave Sounding Unit (AMSU),
launched together onboard the European MetOp platform in October 2006, are
used to retrieve an upper tropospheric content of carbon dioxide (CO2)
covering the range 11–15 km (100–300 hPa), in clear-sky conditions, in the
tropics, over sea, for the first year of operation of MetOp (January
2008–December 2008). With its very high spectral resolution, IASI provides
fourteen channels in the 15 μm band highly sensitive to CO2 with
reduced sensitivities to other atmospheric variables. IASI observations,
sensitive to both CO2 and temperature, are used in conjunction with AMSU
observations, only sensitive to temperature, to decorrelate both signals
through a non-linear inference scheme based on neural networks. A key point
of this approach is that no use is made of prior information in terms of
CO2 seasonality, trend, or geographical patterns. The precision of the
retrieval is estimated to be about 2.0 ppmv (~0.5%) for a
5°×5° spatial resolution on a monthly time scale.
Features of the retrieved CO2 space-time distribution include: (1) a
strong seasonal cycle of 4 ppmv in the northern tropics with a maximum in
June–July and a minimum in September–October. This cycle is characterized by
a backward two-months lag as compared to the surface, by a backward one-month
lag as compared to measurements performed at 11 km, and by a forward
one-month lag as compared to observations performed at the tropopause (16 km).
This is likely due to the time-lag of CO2 cycle while transported
from the surface to the upper troposphere; (2) a more complex seasonal cycle
in the southern tropics, in agreement with in-situ measurements; (3) a
latitudinal variation of CO2 shifting from a South-to-North increase of
3.5 ppmv in boreal spring to a South-to-North decrease of 1.5 ppmv in the
fall, in excellent agreement with tropospheric aircraft measurements; (4)
signatures of CO2 emissions transported to the upper troposphere. In
addition to bringing an improved view of CO2 distribution, these results
from IASI should provide an additional means to observe and understand
atmospheric transport pathways of CO2 from the surface to the upper
troposphere. |
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