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These different methods correspond to bulk parameterization schemes, which merge the signature of clouds on Meteosat second\u2010generation (MSG) data with information on atmosphere water content and near\u2010surface air temperature available from numerical weather prediction (NWP) fields. The new formulation consists of a generalization of a method first developed for clear sky cases and now fine\u2010tuned for a wider range of atmospheric conditions. The performance of this and three other parameterization schemes is compared with independent ground observations. Such a validation exercise is extended also to European Centre for Medium\u2010Range Weather Forecast (ECMWF) flux forecasts, since the ECMWF model is the main source of information on air temperature and water vapor content, and to surface fluxes obtained from the Clouds and the Earth's Radiant Energy System (CERES). It is shown that the new parameterization scheme performs well when compared to other methods, with root mean square errors within 20 Wm<jats:sup>\u22122<\/jats:sup>. The overall good matching between parameterized values and in situ data suggests a good performance of a relatively simple bulk scheme and also of the use of MSG\u2010based cloud identification.<\/jats:p>","DOI":"10.1029\/2010jd013888","type":"journal-article","created":{"date-parts":[[2010,12,28]],"date-time":"2010-12-28T21:01:09Z","timestamp":1293570069000},"source":"Crossref","is-referenced-by-count":26,"title":["Estimation of downward long\u2010wave radiation at the surface combining remotely sensed data and NWP data"],"prefix":"10.1029","volume":"115","author":[{"given":"Isabel F.","family":"Trigo","sequence":"first","affiliation":[{"name":"Instituto de Meteorologia  Lisbon Portugal"},{"name":"Instituto Dom Luiz University of Lisbon  Lisbon Portugal"}]},{"given":"Carla","family":"Barroso","sequence":"additional","affiliation":[{"name":"Instituto de Meteorologia  Lisbon Portugal"}]},{"given":"Pedro","family":"Viterbo","sequence":"additional","affiliation":[{"name":"Instituto de Meteorologia  Lisbon Portugal"},{"name":"Instituto Dom Luiz University of Lisbon  Lisbon Portugal"}]},{"given":"Sandra C.","family":"Freitas","sequence":"additional","affiliation":[{"name":"Instituto de Meteorologia  Lisbon Portugal"}]},{"given":"Isabel T.","family":"Monteiro","sequence":"additional","affiliation":[{"name":"Instituto de Meteorologia  Lisbon Portugal"}]}],"member":"13","published-online":{"date-parts":[[2010,12,29]]},"reference":[{"volume-title":"MODTRAN4 Version 2 User's Manual Air Force Res. 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