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| Titel |
Aerosol information content analysis of multi-angle high spectral resolution measurements and its benefit for high accuracy greenhouse gas retrievals |
| VerfasserIn |
C. Frankenberg, O. Hasekamp, C. O'Dell, S. Sanghavi, A. Butz, J. Worden |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 5, no. 7 ; Nr. 5, no. 7 (2012-07-27), S.1809-1821 |
| Datensatznummer |
250003017
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| Publikation (Nr.) |
 copernicus.org/amt-5-1809-2012.pdf |
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| Zusammenfassung |
| New generations of space-borne spectrometers for the retrieval of atmospheric
abundances of greenhouse gases require unprecedented accuracies as
atmospheric variability of long-lived gases is very low. These instruments,
such as GOSAT and OCO-2, typically use a high spectral resolution oxygen
channel (O2 A-band) in addition to CO2 and CH4 channels to
discriminate changes in the photon path-length distribution from actual trace
gas amount changes. Inaccurate knowledge of the photon path-length
distribution, determined by scatterers in the atmosphere, is the prime source
of systematic biases in the retrieval. In this paper, we investigate the
combined aerosol and greenhouse gas retrieval using multiple satellite
viewing angles simultaneously. We find that this method, hitherto only
applied in multi-angle imagery such as from POLDER or MISR, greatly enhances
the ability to retrieve aerosol properties by 2–3 degrees of freedom. We find
that the improved capability to retrieve aerosol parameters significantly
reduces interference errors introduced into retrieved CO2 and CH4
total column averages. Instead of focussing solely on improvements in
spectral and spatial resolution, signal-to-noise ratios or sampling
frequency, multiple angles reduce uncertainty in space based greenhouse gas
retrievals more effectively and provide a new potential for dedicated
aerosols retrievals. |
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