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| Titel |
The GRAPE aerosol retrieval algorithm |
| VerfasserIn |
G. E. Thomas, C. A. Poulsen, A. M. Sayer, S. H. Marsh, S. M. Dean, E. Carboni, R. Siddans, R. G. Grainger, B. N. Lawrence |
| 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 ; 2, no. 2 ; Nr. 2, no. 2 (2009-11-06), S.679-701 |
| Datensatznummer |
250000576
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| Publikation (Nr.) |
 copernicus.org/amt-2-679-2009.pdf |
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| Zusammenfassung |
The aerosol component of the Oxford-Rutherford Aerosol and Cloud (ORAC)
combined cloud and aerosol retrieval scheme is described and the theoretical
performance of the algorithm is analysed. ORAC is an optimal estimation
retrieval scheme for deriving cloud and aerosol properties from measurements
made by imaging satellite radiometers and, when applied to cloud free
radiances, provides estimates of aerosol optical depth at a wavelength of
550 nm, aerosol effective radius and surface reflectance at 550 nm. The
aerosol retrieval component of ORAC has several incarnations – this paper
addresses the version which operates in conjunction with the cloud retrieval
component of ORAC (described by Watts et al., 1998), as applied in producing
the Global Retrieval of ATSR Cloud Parameters and Evaluation (GRAPE)
data-set.
The algorithm is described in detail and its performance examined. This
includes a discussion of errors resulting from the formulation of the forward
model, sensitivity of the retrieval to the measurements and a priori
constraints, and errors resulting from assumptions made about the
atmospheric/surface state. |
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