气候变化领域集成服务门户(CCPortal): Spatial and Temporal Variability in Positive Degree-Day in Western China under Climate Change

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DOI	10.3390/atmos12040443
	Spatial and Temporal Variability in Positive Degree-Day in Western China under Climate Change
	Liu, Guohua; Chen, Rensheng; Wang, Xiqiang
通讯作者	Chen, RS (通讯作者)，Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Ecohydrol Inland River Basin, Qilian Alpine Ecol & Hydrol Res Stn, Lanzhou 730000, Peoples R China. ; Chen, RS (通讯作者)，Northwest Univ, Coll Urban & Environm Sci, Xian 710000, Peoples R China.
发表日期	2021
EISSN	2073-4433
卷号	12 期号:4
英文摘要	Positive degree-day (PDD) indicates the accumulated positive temperature in a given time period; it directly relates to the melting of snow and ice, and it is a key parameter between global warming and cryosphere changes. In this study, we calculated the PDD based on the daily mean temperatures from 1960 to 2018 at meteorological stations, and we used measured and interpolated data to determine spatial and temporal distribution and changes in PDD in western China (WC). Results show that the mean annual, warm season, and cold season PDD values at 209 meteorological stations were 3652.2, 2832.9, and 819.3 degrees C, respectively. PDD spatial distribution in WC is similar to that of air temperature. In WC, PDD mainly ranged from 0 to 5000, 1000 to 4000, and 0 to 1000 degrees C year(-1), respectively for annual, warm season, and cold season. From 1960 to 2018, the observed mean initial day of PDD moved forward by 8.3 days, and the final day was delayed by 8.2 days, with the duration expanding to 16.6 days; the trend in PDD reversed in the 1980s and the change rate in PDD for annual, warm season and cold season was 6.6, 3.8, and 2.7 degrees C year(-1), respectively. Regionally, PDD increased in almost all areas; the high PDD advanced from south to north, east to west, desert to mountain, and low to high altitudes. The results also showed that the warming rate of PDD was lower in the cold season and in high-altitude areas, which was opposite to the observed temperature patterns, however, the non-linear relationship between PDD and mean temperature over a period of time is the main reason for this phenomenon. This study adds more details for the understanding of climate change in WC, and suggests that more attention should be paid to PDD in the study of cryosphere changes.
英文关键词	positive degree day; distribution; trend; change rate; western China
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS类目	Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000642732000001
来源期刊	ATMOSPHERE
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/253896
作者单位	[Liu, Guohua; Chen, Rensheng; Wang, Xiqiang] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Ecohydrol Inland River Basin, Qilian Alpine Ecol & Hydrol Res Stn, Lanzhou 730000, Peoples R China; [Liu, Guohua] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Chen, Rensheng] Northwest Univ, Coll Urban & Environm Sci, Xian 710000, Peoples R China
推荐引用方式 GB/T 7714	Liu, Guohua,Chen, Rensheng,Wang, Xiqiang. Spatial and Temporal Variability in Positive Degree-Day in Western China under Climate Change[J]. 中国科学院西北生态环境资源研究院,2021,12(4).
APA	Liu, Guohua,Chen, Rensheng,&Wang, Xiqiang.(2021).Spatial and Temporal Variability in Positive Degree-Day in Western China under Climate Change.ATMOSPHERE,12(4).
MLA	Liu, Guohua,et al."Spatial and Temporal Variability in Positive Degree-Day in Western China under Climate Change".ATMOSPHERE 12.4(2021).