FDR4ATMOS: A Level 1 FDR Product Combining GOME, SCIAMACHY and GOME-2 Data

Kurzfassung

The Fundamental Data Record for ATMOSpheric Composition (FDR4ATMOS) project is part of the European Space Agency (ESA) Long Term Data Preservation (LTDP) programme. A Fundamental Data Record (FDR) is a long-term record of selected Earth observation Level 1 parameters (radiance, irradiance, reflectance), possibly multi-instrument, which provides improvements of performance beyond the individual mission data sets. Version 1 of the FDR provided harmonised Level 1 data (Earth reflectances and solar irradiances) from GOME and SCIAMACHY spanning a 17 year period offering spectrally highly resolved data essential for air quality applications, climate, ozone trend and UV radiation studies. In version 2 we will add GOME-2 data from 2007 to 2024 extending the data set to 29 years. The FDR provides for the first time a harmonised data set for highly resolving spectrometers. Moreover, we reviewed and re-calculated uncertainties based on strict metrological methods, and the impact of the harmonization on derived Level-2 product stability (Ozone and NO2) will be evaluated. The FDR4ATMOS project will provide products that - span the GOME, SCIAMACHY and GOME-2 missions from 1995 to 2024 - provides harmonised solar irradiances using the TSIS solar standard - Provides reflectances for retrieval windows of O3, SO2, NO2 and the NIR spectral range In addition to Earth spectra we also developed a lunar product, based on special SCIAMACHY and GOME-2 measurements, containing full disk equivalent lunar reflectance In this paper we will give and overview of the current status of the FDR4ATMOS project and present our work, the harmonisation of the solar irradiance and Earth reflectances, and on this new lunar data set