{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,13]],"date-time":"2026-05-13T11:38:14Z","timestamp":1778672294282,"version":"3.51.4"},"reference-count":41,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2020,1,27]],"date-time":"2020-01-27T00:00:00Z","timestamp":1580083200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"the National Key Research and Development Program of China","award":["(2018YFC1506701)"],"award-info":[{"award-number":["(2018YFC1506701)"]}]},{"DOI":"10.13039\/501100001809","name":"the National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["41675102"],"award-info":[{"award-number":["41675102"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"name":"the Special Fund for Meteorological Scientific Research in Public Interest","award":["GYHY201506002"],"award-info":[{"award-number":["GYHY201506002"]}]},{"name":"the Special Fund for Meteorological Scientific Research in Public Interest","award":["GYHY201506022"],"award-info":[{"award-number":["GYHY201506022"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>To make better use of microwave radiance observations for data assimilation, removal of radiances contaminated by hydrometeor particles is one of the most important steps. Generally, all observations below the middle troposphere are eliminated before the analysis when precipitation is present. However, the altitude of the cloud top varies; when the weighting function peak height of a channel is higher than the altitude of the cloud top, observations are not affected by the absorption or scattering of cloud particles. Thus, the radiative transfer calculation can be performed under a clear sky scenario. In this paper, a dynamic channel selection (DCS) method was developed to determine the radiance observations unaffected by clouds under cloudy conditions in assimilation. First, the sensitivity of cloud liquid water (CLW) profiles to radiance from the microwave temperature sounding frequencies was analyzed. It was found that the impact of CLW on transmittance can be neglected where the cloud top height is below the weighting function peak height. Second, three lookup tables were devised through analysis of the impact of cloud fraction and cloud top height on radiance, which is the basis of the DCS method. The unified cloud top height of the Microwave Temperature Sounder (MWTS)-2 fields of view (FOVs) can be calculated by remapping the cloud mask and cloud top height data from the Medium Resolution Spectral Imager-2 (MERSI-2). Observations from various channels may be removed or retained based on real-time dynamic unified cloud top height data. Twelve-hour and long-term time-series brightness temperature simulation experiments both showed that an increase in the amount of observations used for data assimilation of more than 300% can be achieved by application of DCS, but this had no effect on the amount of error. Through DCS, areas of strong precipitation can be accurately identified and removed, and more observations above cloud top height can be included in the data assimilation. The application of DCS to data assimilation will greatly improve the data utilization rate, and therefore allow for more accurate characterization of upper atmospheric circulation.<\/jats:p>","DOI":"10.3390\/rs12030403","type":"journal-article","created":{"date-parts":[[2020,1,27]],"date-time":"2020-01-27T07:41:11Z","timestamp":1580110871000},"page":"403","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Dynamic Channel Selection of Microwave Temperature Sounding Channels under Cloudy Conditions"],"prefix":"10.3390","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8729-9356","authenticated-orcid":false,"given":"Luyao","family":"Qin","sequence":"first","affiliation":[{"name":"Key Laboratory of Meteorological Disaster of Ministry of Education (KLME)\/Joint International Research Laboratory of Climate and Environment Change (ILCEC)\/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Nanjing University of Information Science &amp; Technology, Nanjing 210044, China"},{"name":"Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites (LRCVES\/CMA), National Satellite Meteorological Center, China Meteorological Administration (NSMC\/CMA), Beijing 100081, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yaodeng","family":"Chen","sequence":"additional","affiliation":[{"name":"Key Laboratory of Meteorological Disaster of Ministry of Education (KLME)\/Joint International Research Laboratory of Climate and Environment Change (ILCEC)\/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Nanjing University of Information Science &amp; Technology, Nanjing 210044, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6962-2575","authenticated-orcid":false,"given":"Tianlei","family":"Yu","sequence":"additional","affiliation":[{"name":"Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites (LRCVES\/CMA), National Satellite Meteorological Center, China Meteorological Administration (NSMC\/CMA), Beijing 100081, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Gang","family":"Ma","sequence":"additional","affiliation":[{"name":"Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites (LRCVES\/CMA), National Satellite Meteorological Center, China Meteorological Administration (NSMC\/CMA), Beijing 100081, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yang","family":"Guo","sequence":"additional","affiliation":[{"name":"Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites (LRCVES\/CMA), National Satellite Meteorological Center, China Meteorological Administration (NSMC\/CMA), Beijing 100081, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7115-1389","authenticated-orcid":false,"given":"Peng","family":"Zhang","sequence":"additional","affiliation":[{"name":"Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites (LRCVES\/CMA), National Satellite Meteorological Center, China Meteorological Administration (NSMC\/CMA), Beijing 100081, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2020,1,27]]},"reference":[{"key":"ref_1","first-page":"627","article-title":"Use of cloud-cleared radiances in three\/four-dimensional variational data assimilation","volume":"120","author":"Andersson","year":"1994","journal-title":"Quart. 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