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Validation of the ENVISAT synergetic aerosol retrieval

Thomas Holzer-Popp(1)

(1) DLR, Oberpfaffenhofen, 82234 Wessling, Germany

Abstract

Thomas Holzer-Popp, Robert Höller, Aasmund Fahre Vik, Marion Schroedter-Homscheidt

At DLR-DFD a synergetic aerosol retrieval method SYNAER was developed, which exploits the complementary information content of the radiometer AATSR and the spectrometer SCIAMCHY, both onboard ENVISAT. This combination of two instruments allows to retrieve several parameters of the atmospheric aerosol loading: - aerosol optical depth at 550 nm - aerosol speciation from a choice of pre-defined aerosol types - near-surface aerosol mass concentration (PM10, PM2.5, PM0.5) assuming a fixed boundary layer height

Application of the SYNAER algorithm faces limitations, which need to be quantified: - the accuracy of the results decreases significantly for bright surfaces - the retrieved speciation is ambiguous for low aerosol optical depth - the accuracy of the results decreases for high cloud fraction - the accuracy of the PM values depends on the assumed vertical profile

Within the ESA GSE project PROMOTE, SYNAER contributes to the air quality monitoring service with daily near-real time aerosol products and an archive of aerosol observations over the MSG field of view (Europe, Africa, Atlantic) and parts of Asia. As in all GSE services quality control through thorough and continuous validation is a key requirement by the users. SYNAER provides accuracy and quality information for each pixel with retrieval results.

It is the goal of this paper to summarize the validation results by inter-comparison to ground-based observations (AERONET, EMEP) achieved by these two core users of the PROMOTE consortium: NILU and UBA Austria. The pixel-wise SYNAER quality information will be assessed using PM data from the national ground-based in situ monitoring networks of Norway and Austria. Based on these validation results, a contribution to the quantification of the SYNAER limitations will be extracte

 

Workshop poster

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry