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Validation of the Grape Single View Aerosol Retrieval for Atsr-2 and Insights Into the Long Term Global Aod Trend : Volume 9, Issue 5 (14/10/2009)

By Thomas, G. E.

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Book Id: WPLBN0003987339
Format Type: PDF Article :
File Size: Pages 38
Reproduction Date: 2015

Title: Validation of the Grape Single View Aerosol Retrieval for Atsr-2 and Insights Into the Long Term Global Aod Trend : Volume 9, Issue 5 (14/10/2009)  
Author: Thomas, G. E.
Volume: Vol. 9, Issue 5
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: copernicus


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Siddans, R., Sayer, A. M., Poulsen, C. A., Carboni, E., Marsh, S. H., Lawrence, B. N.,...Grainger, R. G. (2009). Validation of the Grape Single View Aerosol Retrieval for Atsr-2 and Insights Into the Long Term Global Aod Trend : Volume 9, Issue 5 (14/10/2009). Retrieved from

Description: Atmospheric, Oceanic and Planetary Physics, University of Oxford, Oxford, UK. The Global Retrieval of ATSR Cloud Parameters and Evaluation (GRAPE) project has produced a global data-set of cloud and aerosol properties from the Along Track Scanning Radiometer-2 (ATSR-2) instrument, covering the time period 1995–2001. This paper presents the validation of aerosol optical depths (AODs) from this product against AERONET sun-photometer measurements, as well as a comparison to the Advanced Very High Resolution Radiometer (AVHRR) optical depth product produced by the Global Aerosol Climatology Project (GACP).

The GRAPE AOD over ocean is found to be in good agreement with AERONET measurements, with a correlation of 0.79 and a best-fit slope of 1.0±0.1, but with a positive bias of 0.08±0.04. Although the GRAPE and GACP datasets show reasonable agreement, there are significant differences. These discrepancies are explored, and suggest that the downward trend in AOD reported by GACP may arise from changes in sampling due to the orbital drift of the AVHRR instruments.

Validation of the GRAPE single view aerosol retrieval for ATSR-2 and insights into the long term global AOD trend

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