Temporal and spatial characteristics of drought based on SPEI in northern China from 1981 to 2017
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DOI:10.7606/j.issn.1000-7601.2019.04.29
Key Words: northern China  temporal and spatial characteristics of drought  standardized precipitation evapotranspiration index(SPEI)  rotational empirical orthogonal matrix(REOF)
Author NameAffiliation
SHI Shang-yu Institute of Soil and Water Conservation, Chinese Academy of Science & Ministry of Water Resources, Yangling, Shaanxi 712100, China University of Chinese Academy of Science, Beijing 100049, China 
WANG Fei Institute of Soil and Water Conservation, Chinese Academy of Science & Ministry of Water Resources, Yangling, Shaanxi 712100, China University of Chinese Academy of Science, Beijing 100049, China College of Resources and Environment, Northwest A&F University, Yangling, Shannxi 712100, China 
JIN Kai College of Resources and Environment, Northwest A&F University, Yangling, Shannxi 712100, China 
DING Wen-bing College of Resources and Environment, Northwest A&F University, Yangling, Shannxi 712100, China 
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Abstract:
      Based on the measured daily precipitation and calculated the potential evapotranspiration,using Penman-Monteith formula, the standardized precipitation evapotranspiration index (SPEI) from 1981 to 2017 in northern China was established.The Mann-Kendall test (MK)and rotating empirical orthogonal matrix (REOF) method were used to explore the temporal and spatial characteristics ofdrought in this region over 37 years. The results showed that: (1) About 74% of the whole region had decreasing SPEI from 1981 to 2017, and about 43% of area of whole region had a significant decrease trend. The average SPEI trend rate was -0.015·a-1 (P<0.01). Moreover, the turning point of SPEI change occurred in1994; (2) The area that the frequency of slightly arid (-1.2
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