干旱区生态环境知识资源中心(Arid): Causes and effects of spatial and temporal variations of cold period in Chinese oases between 1960 and 2014

Arid

	Causes and effects of spatial and temporal variations of cold period in Chinese oases between 1960 and 2014
	Chai Zhonghua; Liu Puxing
来源期刊	Journal of Geographical Sciences
ISSN	1009-637X
出版年	2016
卷号	26 期号:12 页码:1647-1660
英文摘要	Based on daily average temperatures and observation data from 74 meteorological stations in Chinese oases, we calculate five-day (pentad) average temperature ≤0℃ for the start and end pentad as well as pentads of cold period using linear regression analysis, nonparametric Mann-Kendall tests, the Morlet wavelet power spectrum, and correlation analysis. We also analyze spatial and temporal variations and their effects on the start and end pentad as well as pentads of cold period in Chinese oases. Results show that over the last 55 years, the start pentad of cold period has been postponed while the end pentad has been advanced. Overall, the pentads have gradually shortened over time at trend rates that are 0.3 p/10a, -0.27 p/10a, and -0.58 p/10a, respectively. Spatial differences are significant, especially for the Qaidam Basin oasis where the start pentad is the earliest, the end pentad is the latest, and the trend of change is most obvious. Mutation points for the start and end pentad as well as pentads of cold period were observed in 1990, 1998, and 1994, respectively. Of these, the start pentad and pentads of cold period show a periodic cycle, related to atmospheric circulation and El Nino events, while the end pentad exhibits a periodic cycle, related to solar activity. The Tibetan Plateau index (TPI), the Asian polar vortex area index (APVAI), and carbon dioxide emissions (CDE) are the main factors affecting cold period in the study area, whereas the South Asian summer monsoon (SASM) index exerts the greatest effect on the Qaidam Basin oasis. The start and end pentad as well as pentads of cold period increase in concert with latitude, longitude, and altitude; in response to these changes, the start pentad is advanced, the end pentad is postponed, and pentads of cold period are gradually extended. Results show that change in latitude is most significant. Overall, the start and end pentad as well as pentads of cold period show clear responses to regional warming, but there are different effects on each.
英文关键词	Chinese oases pentad average temperature influencing factor regional warming
类型	Article
语种	英语
开放获取类型	Bronze
收录类别	CSCD
WOS研究方向	Meteorology & Atmospheric Sciences
CSCD记录号	CSCD:5842133
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335727
作者单位	Chai Zhonghua, College of Geography and Environmental Science, Northwest Normal University, Lanzhou, Gansu 730070, China.; Liu Puxing, College of Geography and Environmental Science, Northwest Normal University, Lanzhou, Gansu 730070, China.
推荐引用方式 GB/T 7714	Chai Zhonghua,Liu Puxing. Causes and effects of spatial and temporal variations of cold period in Chinese oases between 1960 and 2014[J],2016,26(12):1647-1660.
APA	Chai Zhonghua,&Liu Puxing.(2016).Causes and effects of spatial and temporal variations of cold period in Chinese oases between 1960 and 2014.Journal of Geographical Sciences,26(12),1647-1660.
MLA	Chai Zhonghua,et al."Causes and effects of spatial and temporal variations of cold period in Chinese oases between 1960 and 2014".Journal of Geographical Sciences 26.12(2016):1647-1660.