DOI: 10.1002/jgrd.50790
论文题名: Cloud detection and analysis on the Tibetan Plateau using Meteosat and CloudSat
作者: Rüthrich F. ; Thies B. ; Reudenbach C. ; Bendix J.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 17 起始页码: 10082
结束页码: 10099
语种: 英语
英文关键词: climatology
; cloud retrieval
; CloudSat
; dynamic
; Meteosat
; Tibet
Scopus关键词: Climatology
; Clouds
; Dynamics
; Regression analysis
; Storms
; Cloud retrieval
; CloudSat
; International satellite cloud climatology projects
; Logistic regression models
; Mesoscale Convective System
; Meteosat
; Spatio-temporal resolution
; Tibet
; Weather satellites
; cloud cover
; CloudSat
; data set
; detection method
; diurnal variation
; Meteosat
; observational method
; resolution
; satellite data
; spatiotemporal analysis
; China
; Himalayas
; Qinghai-Xizang Plateau
英文摘要: Previous studies of clouds over the Tibetan Plateau (TiP) were subject to limitations. Surface observations are scarce, and satellite retrievals are not well adapted to the peculiar conditions of the TiP. For the most comprehensive existing cloud data set, provided by the International Satellite Cloud Climatology Project (ISCCP), issues were reported for the TiP. It also lacks sufficient spatiotemporal resolution for this topographically complex region. With the Indian Ocean Data Coverage service, European Organisation for the Exploitation of Meteorological Satellites provides a Meteosat data set between 1998 and 2008. The resolution of around 6 km at the study area is sufficient even for complex terrain. Based on this data set and on products of the active sensor onboard CloudSat, we develop a novel gross-cloud retrieval for the TiP using logistic regression models. The approach maintains the original Meteosat resolution. Validation against independent CloudSat data reveals good performance. The approach also outperforms the ISCCP pixel level (DX) data set. The resulting data set is the first for the TiP that provides cloud information with sufficient resolution for both day and night. Patterns of cloud frequencies during winter, premonsoon, and monsoon seasons are analyzed. Strong diurnal forcing is found for the plateau. Peaks of cloud frequencies above the slopes occur during afternoon, while they are delayed in the valleys, where high cloud frequencies persist throughout the nights. Above the lower parts of the southern foothills of the Himalayas cloud frequencies were for the first time found to increase until the early morning. Katabatic flows are suspected to be responsible for this pattern by initiating the formation of mesoscale convective systems. Key Points A novel cloud retrieval for Tibet combining passive and active satellitesLocal and diurnal cloud patterns are analyzed using the improved retrievalStrong cloud-topography interactions were found for both, day and night ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63340
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Laboratory for Climatology and Remote Sensing, Philipps Universität Marburg, Deutschhausstr. 10, 35032 Marburg, Germany; Philipps Universität Marburg, Marburg, Germany
Recommended Citation:
Rüthrich F.,Thies B.,Reudenbach C.,et al. Cloud detection and analysis on the Tibetan Plateau using Meteosat and CloudSat[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(17)