Three years of ENVISAT synergetic aerosol retrieval
(1) DLR, Oberpfaffenhofen, 82234 Wessling, Germany
Thomas Holzer-Popp, Aida Diop, 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 SCIAMACHY, 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
In the meantime, 3 years of ENVISAT AATSR and SCIAMACHY level 1 nadir data have been acquired (2003-2005). This period includes the exceptional hot summer of 2003. Processing of these data over the MSG field of view (Europe, Africa, Atlantic) and parts of Asia has been started within the ESA GSE project PROMOTE, where SYNAER contributes to the air quality monitoring service. SYNAER products are provided daily in near-real time as input for data assimilation into chemistry transport models, and as long-term archive.
It is the goal of this paper to summarize the results of this monitoring effort. The presented results will range from individual daily datasets to monthly mean maps. Whereas the daily datasets exhibit large data gaps due to the san patterns of the synergetic sensor pair (SCIAMACHY nadir limb switching, AATSR swath width) and cloudiness, the monthly mean datasets provide reduces temporal resolution, which is not sufficient for near-real time purposes. The mid-term perspective for the SYNAER products promises a long-term dataset ranging from 1995 with ERS-2 (ATSR-2 and GOME) to 2020 with METOP (AVHRR and GOME-2), as the algorithm development was always focused on applicability to all these 3 platforms (thus not using special features as e.g. SCIAMCHY mid infrared channels or ATSR dual view).
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,