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Assessment of Diverse Algorithms Applied on Modis Aqua and Terra Data Over Land Surfaces in Europe : Volume 5, Issue 2 (19/03/2012)

By Glantz, P.

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Book Id: WPLBN0003982122
Format Type: PDF Article :
File Size: Pages 31
Reproduction Date: 2015

Title: Assessment of Diverse Algorithms Applied on Modis Aqua and Terra Data Over Land Surfaces in Europe : Volume 5, Issue 2 (19/03/2012)  
Author: Glantz, P.
Volume: Vol. 5, Issue 2
Language: English
Subject: Science, Atmospheric, Measurement
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Description
Description: Department of Applied Environmental Science, Stockholm University, Stockholm, Sweden. The aim of the present study is to validate AOT (aerosol optical thickness) and Ångström exponent (α), obtained with the SAER (Satellite AErosol Retrieval) algorithm for MODIS (MODerate resolution Imaging Spectroradiometer) Aqua and Terra calibrated level 1 data (1 km horizontal resolution at ground) and MODIS Collection 5 (c005) standard product retrievals (10 km), against AERONET (AErosol RObotic NETwork) observations over land surfaces in Europe. The three time periods investigated in this study have been chosen to enable a validation of the algorithm for a maximal possible variation in sun elevations. For several of the cases analyzed here the Aqua and Terra satellites passed the investigation area twice during a day. Thus, beside a variation in the sun elevation the satellite retrievals have also on a daily basis been performed with a significant variation in the satellite-viewing geometry. An inter-comparison of the two algorithms has also been performed. The validation with AERONET shows that the MODIS c005 retrieved AOT is, for the wavelengths 0.469 and 0.500 nm, on the whole within the expected uncertainty for one standard deviation of the MODIS c005 retrievals over Europe (Δ AOT = ±0.05±0.15 AOT). The SAER estimated AOT for the wavelength 0.443 nm also agree reasonable well with AERONET. Thus, the majority of the SAER AOT values are within the MODIS expected uncertainty range, although somewhat larger root mean square deviation occurs compared to the results obtained with the MODIS c005 algorithm. The discrepancy between SAER and AERONET AOT is, however, substantially larger for the wavelength 488 nm, which means that the values are to a large extent outside of the expected MODIS uncertainty range. Both satellite retrieval algorithms are unable to estimate Α accurately, although the MODIS c005 algorithm performs better. Based on the inter-comparison of the SAER and MODIS c005 algorithms it was found that the SAER is able to obtain results within the expected uncertainty range of MODIS for Aqua and Terra observations during periods 1 and 3. The same was found for MODIS Aqua observations during period 2 but only for AOT below 0.5.

Summary
Assessment of diverse algorithms applied on MODIS Aqua and Terra data over land surfaces in Europe

Excerpt
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