Systematic conversion of satellite AOD into near-surface mass concentrations
(1) DLR, Oberpfaffenhofen, 82234 Wessling, Germany
Thomas Holzer-Popp, 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 (AOD) at 550 nm
- aerosol speciation from a choice of pre-defined aerosol types
These two features of the aerosol properties can be used to calculate a systematic conversion of AOD values into aerosol mass concentrations (PM10, PM2.5, PM0.5) and their speciation. However, the vertical profile structure is an essential additional input for deriving accurate PM values under all cirumstances. This can be derived from operational chemistry transport models, e.g. the EURAD/MADE model. Using this singular auxiliary information and the SYNAER output provides a systematic conversion of AOD into PM values. This approach holds the potential to enable a global all-year application in comparison to experimental statistical correlations which have been demonstrated for several sensors but generally are restricted to a certain region or season.
It is the goal of this paper to summarize the results of this AOD-to-PM conversion approach including case study validation efforts.
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,