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DOI10.1155/2019/7692871
Variations of the Reference Evapotranspiration and Aridity Index Over Northeast China: Changing Properties and Possible Causes
Cao, Liguo; Zhou, Zhengchao
发表日期2019
ISSN1687-9309
EISSN1687-9317
英文摘要

Temporal and spatial variations in reference evapotranspiration (ET0) and aridity index (AI) can be used as important indexes for understanding climate change and its effects on ecosystem stability. Thus, in this work, we comprehensively investigated 71 meteorological stations in Northeast China from 1965 to 2017 to analyze the spatial-temporal variation and trend of ET0 and AI using the nonparametric Mann-Kendall test, the linear regression, and the Morlet wavelet methods. The results elucidated that ET0 for Northeast China as a whole exhibited a decrease at a rate of -1.97mm/yr, AI declined at a rate of -0.01/yr during 1965-2017, and approximately 94% stations showed a decrease trend. Spatially, the high values of AI and ET0 were primarily at the western part of the study area except for the Heilongjiang province, and the stations showing low values were mainly distributed in the central and eastern part. The decreasing trends for AI were more obvious in the eastern part compared with the western part over the study region. The abrupt changes in AI occurred in 2005 and 2007, whereas only one abrupt change for ET0 occurred in 1995. For annual ET0, there were periods of 3, 7, 11, and 15yr, and there existed periods of 1, 7, 11, and 13yr for annual AI. The correlation coefficients implied wind speed and precipitation were the dominant meteorological factors resulting in the ET0 and AI decrease, respectively. Additionally, the change of the Indian summer monsoon index (ISMI) may also contribute to the weakened AI in the study area. Nevertheless, further investigation is still required to clarify the mechanisms for AI and ET0 variations in the future.


WOS研究方向Meteorology & Atmospheric Sciences
来源期刊ADVANCES IN METEOROLOGY
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/91037
作者单位Shaanxi Normal Univ, Sch Geog & Tourism, Xian 710119, Shaanxi, Peoples R China
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GB/T 7714
Cao, Liguo,Zhou, Zhengchao. Variations of the Reference Evapotranspiration and Aridity Index Over Northeast China: Changing Properties and Possible Causes[J],2019.
APA Cao, Liguo,&Zhou, Zhengchao.(2019).Variations of the Reference Evapotranspiration and Aridity Index Over Northeast China: Changing Properties and Possible Causes.ADVANCES IN METEOROLOGY.
MLA Cao, Liguo,et al."Variations of the Reference Evapotranspiration and Aridity Index Over Northeast China: Changing Properties and Possible Causes".ADVANCES IN METEOROLOGY (2019).
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