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

G. E. Thomas; C. A. Poulsen; R. Siddans; A. M. Sayer; E. Carboni; S. H. Marsh; S. M. Dean; R. G. Grainger; B. N. Lawrence

doi:10.5194/acp-10-4849-2010

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

G. E. Thomas, C. A. Poulsen, R. Siddans, A. M. Sayer, E. Carboni, S. H. Marsh, S. M. Dean, R. G. Grainger, B. N. Lawrence

Research output: Contribution to journal › Article › Research › peer-review

24 Citations (Scopus)

Abstract

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) over the ocean 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 Pearson's correlation coefficient 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.

Original language	English
Pages (from-to)	4849-4866
Number of pages	18
Journal	Atmospheric Chemistry and Physics
Volume	10
Issue number	10
DOIs	https://doi.org/10.5194/acp-10-4849-2010
Publication status	Published - 7 Jun 2010
Externally published	Yes

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@article{850d251c299b4ffcb72fe91bb0f0dc93,

title = "Validation of the GRAPE single view aerosol retrieval for ATSR-2 and insights into the long term global AOD trend over the ocean",

abstract = "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) over the ocean 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 Pearson's correlation coefficient 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.",

author = "Thomas, \{G. E.\} and Poulsen, \{C. A.\} and R. Siddans and Sayer, \{A. M.\} and E. Carboni and Marsh, \{S. H.\} and Dean, \{S. M.\} and Grainger, \{R. G.\} and Lawrence, \{B. N.\}",

year = "2010",

month = jun,

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doi = "10.5194/acp-10-4849-2010",

language = "English",

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journal = "Atmospheric Chemistry and Physics",

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T1 - Validation of the GRAPE single view aerosol retrieval for ATSR-2 and insights into the long term global AOD trend over the ocean

AU - Thomas, G. E.

AU - Poulsen, C. A.

AU - Siddans, R.

AU - Sayer, A. M.

AU - Carboni, E.

AU - Marsh, S. H.

AU - Dean, S. M.

AU - Grainger, R. G.

AU - Lawrence, B. N.

PY - 2010/6/7

Y1 - 2010/6/7

N2 - 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) over the ocean 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 Pearson's correlation coefficient 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.

AB - 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) over the ocean 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 Pearson's correlation coefficient 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.

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JO - Atmospheric Chemistry and Physics

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ER -

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

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