{"ob_id":41447,"computationComponent":[{"ob_id":41446,"uuid":"793181872832428784ce64c01fc0f2da","title":"Derivation of the CH4_S5P_WFMD v1.8 product from the WFM-DOAS Retrieval algorithm","abstract":"The Weighting Function Modified Differential Optical Absorption Spectroscopy (WFM-DOAS) algorithm is a least-squares retrieval method based on scaling (or shifting) pre-selected atmospheric vertical profiles.   The column-averaged dry air mole fractions of  methane (denoted XCH4) are derived from the vertical column amounts of methane by normalising with the dry air column, which is obtained from the European Centre for Medium-Range Weather Forecasts (ECMWF) Reanalysis v5 (ERA5). The corresponding vertical columns of CH4 are retrieved from the measured sun-normalised radiance using spectral fitting windows in the SWIR spectral region (2311-2315.5 nm and 2320-2338 nm).\r\n\r\nFor further details see the documentation section.","keywords":"","inputDescription":null,"outputDescription":null,"softwareReference":null,"identifier_set":[]}],"acquisitionComponent":[{"ob_id":26443,"independentInstrument":[],"instrumentplatformpair_set":[{"ob_id":11891,"platform":"https://catalogue.ceda.ac.uk/api/v2/platforms/26439/?format=json","instrument":"https://catalogue.ceda.ac.uk/api/v2/instruments/26444/?format=json","relatedTo":{"ob_id":26443,"uuid":"929d929b043242e69de7b5373acfb611","short_code":"acq"}}]}],"identifier_set":[],"responsiblepartyinfo_set":["https://catalogue.ceda.ac.uk/api/v2/rpis/202053/?format=json"]}