SeaWiFS Ocean Aerosol Retrieval (SOAR): Algorithm, validation, and comparison with other data sets

The Sea‐viewing Wide Field‐of‐view Sensor (SeaWiFS) provides a well‐calibrated 13‐year (1997–2010) record of top‐of‐atmosphere radiance, suitable for use in retrieval of atmospheric aerosol optical depth (AOD). This paper presents and validates a SeaWiFS Ocean Aerosol Retrieval (SOAR) algorithm, whi...

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Vydáno v:	Journal of Geophysical Research: Atmospheres Ročník 117; číslo D3
Hlavní autoři:	Sayer, A. M., Hsu, N. C., Bettenhausen, C., Ahmad, Z., Holben, B. N., Smirnov, A., Thomas, G. E., Zhang, J.
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	Washington, DC Blackwell Publishing Ltd 16.02.2012 American Geophysical Union
Témata:	AERONET aerosol Aerosols Algorithms Atmospheric aerosols Atmospheric sciences Climate change Earth Earth sciences Earth, ocean, space Exact sciences and technology Geobiology Geophysics ocean Optical analysis Quality control Remote sensing retrieval Scientific apparatus & instruments SeaWiFS Troposphere Canada, Maritime Prov atmosphere Validation algorithms aerosols quality controls Space remote sensing Regional scope fine-grained materials Satellite observation clouds loading quality correlation Shielding effect Optical thickness Measuring network data bases particles SeaStar satellite uncertainties seasonal variations Comparative study radiance
ISSN:	0148-0227, 2169-897X, 2156-2202, 2169-8996
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Popis
Shrnutí:	The Sea‐viewing Wide Field‐of‐view Sensor (SeaWiFS) provides a well‐calibrated 13‐year (1997–2010) record of top‐of‐atmosphere radiance, suitable for use in retrieval of atmospheric aerosol optical depth (AOD). This paper presents and validates a SeaWiFS Ocean Aerosol Retrieval (SOAR) algorithm, which retrieves the AOD at 550 nm and the partition of aerosol particle volume between fine and coarse modes. The algorithm has been applied over water to the whole SeaWiFS record. The data set includes quality flags to identify those retrievals suitable for quantitative use. SOAR has been validated against Aerosol Robotic Network (AERONET) and Maritime Aerosol Network (MAN) data and found to compare well (correlation 0.86 at 550 nm and 0.88 at 870 nm for AERONET, and 0.87 at 550 nm and 0.85 at 870 nm for MAN, using recommended quality control settings). These comparisons are used to identify the typical level of uncertainty on the AOD, estimated as 0.03 + 15% at 550 nm and 0.03 + 10% at 870 nm. The data set also includes the Ångström exponent, although as expected this is noisy for low aerosol loadings (correlation 0.50; 0.78 for points where the AOD at 550 nm is 0.3 or more). Retrieved AOD is compared with colocated observations from other satellite sensors; regional and seasonal patterns are found to be common between all data sets, and differences generally linked to factors such as cloud screening and retrieval assumptions. Key Points SeaWiFS provides a long, well‐calibrated time series for aerosol retrievals We describe, validate, and compare a new over‐ocean aerosol retrieval algorithm The new data set is freely available
Bibliografie:	Tab-delimited Table 1.Tab-delimited Table 2.Tab-delimited Table 3. ArticleID:2011JD016599 NASA Measures program - No. 547714.04.14.01.04 ark:/67375/WNG-WTN4RFBV-S istex:197C6C32B5D3C54952454597E08F981F372B6B71 This is a companion to DOI 10.1029/2011JD016689 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 14 ObjectType-Article-1 ObjectType-Feature-2 content type line 23
ISSN:	0148-0227 2169-897X 2156-2202 2169-8996
DOI:	10.1029/2011JD016599