干旱区生态环境知识资源中心(Arid): Improving daily precipitation estimates for the Qinghai-Tibetan plateau based on environmental similarity

Arid

DOI	10.1002/joc.6523
	Improving daily precipitation estimates for the Qinghai-Tibetan plateau based on environmental similarity
	Wang, Yudan 1,2,3; Kong, Yunfeng 1,2; Chen, Hao 3; Zhao, Lin 4
通讯作者	Kong, Yunfeng
来源期刊	INTERNATIONAL JOURNAL OF CLIMATOLOGY
ISSN	0899-8418
EISSN	1097-0088
出版年	2020
卷号	40 期号:12 页码:5368-5388
英文摘要	Due to the scarcity of gauge observations and inaccuracy of satellite estimation, obtaining reliable daily precipitation estimates over the Qinghai-Tibetan Plateau (QTP) remains challenging. In this article, an integrated scheme is developed based on the assumption that in a specific climatic region, the similarity of environmental conditions related to precipitation (SEP) in two locations is positively correlated to the similarities of occurrence and magnitude of precipitation between them. First, the QTP was divided into the northwestern arid, middle semi-arid/semi-humid, and southeastern humid climatic sub-regions by grouping analysis. Second, based on modified weighted k-nearest neighbour model, daily precipitation of target locations in these climatic sub-regions were predicted by weighted regression of a group of gauge observations that have the largest SEP with the target locations. SEP was calculated by the following auxiliary environmental factors: longitude, latitude, elevation, Normalized Difference Vegetation Index, relative humidity, and CMORPH (Climate Prediction Center's morphing technique) daily precipitation estimates (original CMORPH). The validation results demonstrate the effectiveness of the proposed scheme. Compared with the original CMORPH and PDF-calibrated CMORPH (CMORPH calibrated by probability density function matching plus optimal interpolation method) at daily, monthly, and yearly scales, the scheme improves the rain/no rain detection capacity and the accuracy of daily precipitation estimates. In addition, the daily precipitation estimates obtained from this scheme can present significant discrimination over specific geographic units, particularly the Qaidam Basin, the great bend of the Brahmaputra River, and Hengduan Mountain.
英文关键词	daily precipitation estimates environmental conditions similarity the Qinghai-Tibetan plateau
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000515469800001
WOS关键词	LAND-SURFACE CHARACTERISTICS ; TRMM PRECIPITATION ; DOWNSCALING ALGORITHM ; PRODUCTS ; TMPA ; GAUGE ; REGION ; CMORPH ; CHINA ; IMERG
WOS类目	Meteorology & Atmospheric Sciences
WOS研究方向	Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/314749
作者单位	1.Henan Univ, Coll Environm & Planning, Kaifeng 475004, Peoples R China; 2.Henan Univ, Minist Educ, Key Lab Geospatial Technol Middle & Lower Yellow, Kaifeng, Peoples R China; 3.Baoji Univ Arts & Sci, Sch Geog & Environm, Baoji, Peoples R China; 4.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Lanzhou, Peoples R China
推荐引用方式 GB/T 7714	Wang, Yudan,Kong, Yunfeng,Chen, Hao,et al. Improving daily precipitation estimates for the Qinghai-Tibetan plateau based on environmental similarity[J],2020,40(12):5368-5388.
APA	Wang, Yudan,Kong, Yunfeng,Chen, Hao,&Zhao, Lin.(2020).Improving daily precipitation estimates for the Qinghai-Tibetan plateau based on environmental similarity.INTERNATIONAL JOURNAL OF CLIMATOLOGY,40(12),5368-5388.
MLA	Wang, Yudan,et al."Improving daily precipitation estimates for the Qinghai-Tibetan plateau based on environmental similarity".INTERNATIONAL JOURNAL OF CLIMATOLOGY 40.12(2020):5368-5388.