Aerosol retrievals from METEOSAT-8 - CM SAF

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SAF on Climate Monitoring Visiting Scientists Report Doc. No: 1.0 Issue : 1.0 Date : 4 October 2006 cloud property algorithms do not take into account spatial variations in aerosol properties. Within the CM-SAF there is a need for aerosol optical thickness and type information derived from satellite. Firstly, to improve the cloud detection, cloud property and surface irradiance retrievals. Secondly, to provide climate researchers with aerosol optical thickness and type products. Through this Visiting Scientist study the CM-SAF is assessing the potential of MSG/SEVIRI to retrieve aerosol properties. Moreover, Steven Dewitte of RMIB has a PhD. student who works on aerosol retrieval algorithms from MSG over ocean using the thermal channels. More information about the CM-SAF can be found on http://www.cmsaf.dwd.de. 4.2.2 O3M SAF The Satellite Application Facility on Ozone Monitoring (O3M SAF) provides products and services related to global ozone and ground surface UV monitoring. In near-real time the O3M-SAF provides total ozone, ozone profiles and clear-sky UV fields, while off-line total columns of ozone, NO2, OClO, BrO, ozone profiles, aerosols, and surface UV are computed. The aerosol product consists of the Absorbing Aerosols Indicator (AAI) and Aerosol Optical Depth (AOD) and is based on GOME data. AAI is sensitive to absorbing aerosol (dust smoke). O3M-SAF users are interested in the chemical composition of the atmosphere in relation to climate and air quality studies. Aerosols are currently the most interesting constituents in these topics. There is considerable interest to combine aerosol information from GOME or METOP with MSG/SEVIRI derived aerosol information. Due to the spatial resolution of 40*320 km 2 and the repetition time of up to 3 days GOME based products cannot be used to monitor diurnal and regional changes in aerosol properties. The GOME AOD retrievals will be improved by combining them with MSG/SEVIRI retrievals. More information about the O3M-SAF can be found on http://o3saf.fmi.fi/. 4.2.3 LAND-SAF The Land-SAF provides MSG and EPS related products to support land, land-atmosphere interactions and biophysical research. Currently the LAND-SAF does not provide an aerosol optical thickness and aerosol type products. However, aerosols play an important role in the - 6 -
SAF on Climate Monitoring Visiting Scientists Report Doc. No: 1.0 Issue : 1.0 Date : 4 October 2006 retrievals of two LAND-SAF products i.e.: the surface albedo product and the Down Welling Shortwave Radiation Flux product. The Albedo and the Down Welling surface short-wave radiation flux (DSSF) product are generated each day at the full spatial resolution of the MSG/SEVIRI instrument. Both products are based on the three short-wave channels (VIS 0.6µm, NIR 0.8µm, SWIR 1.6µm). For cloud screening the cloud masks derived with the Nowcasting and Very Short Range Forecasting Satellite Application Facility (NWC SAF) software are used. Dynamic information on the atmospheric pressure and water vapour content comes from the ECMWF numerical weather prediction model, whereas climatologic values are used for ozone concentration and aerosol optical thickness. The largest uncertainties in the albedo and the DSSF flux product are non-detected clouds and systematic errors in the aerosol optical thickness values. Since the aerosol optical thicknesses are obtained from a climatologic database, the quality of both products can be improved by using a satellite derived aerosol product. More information on the Land-SAF can be found on https://landsaf.meteo.pt/. 4.2.4 O&SI SAF The Ocean & Sea Ice Satellite Application Facility (O&SI SAF) provides information for the ocean on surface temperatures, ice coverage, radiation fluxes and surface winds. This SAF needs information on aerosols for mapping of ocean surface reflectances and radiation fluxes. More information on the O&SI SAF can be found on http://www.osi-saf.org. 4.3 Cooperation with other SAFs The CM-SAF aims to continue developing retrieval algorithms for parameters that are considered important for climate monitoring. A new development could be an aerosol product from SEVIRI. Such a development could be a federate SAF activity. At the CM-SAF data user conference in Nurnberg, Germany, September 2005 the author of this report presented the preliminary results of the study on aerosol retrievals from METEOSAT-8. Based on the results of this presentation the plan came up to develop aerosol optical thickness and aerosol type products from MSG/SEVIRI and GOME in the framework of a federate SAF activity. - 7 -
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Aerosol retrievals from METEOSAT-8 - CM SAF

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