Abstract
Global climate change is significant, and the spatiotemporal variations of precipitation associated with it are pronounced. Based on the daily precipitation data from 10 weather stations located from southeast to northwest across China from 1961–2017, the Mann–Kendall trend test was generally applied to analyze the spatiotemporal variations of precipitation. The factors influencing the precipitation changes were investigated. The results revealed that (1) the annual, summer, and winter rainfall amount (RA) exhibited increasing rates of 16.36, 12.31, and 2.49 mm/10 year, respectively. The change rates of annual rainfall days (RD) were 2.68 day/10 year in the northwest region and −1.88 day/10 year in the southeast. The annual and seasonal daily precipitation on rainy days (RP) exhibited an increasing trend. (2) All of the RA, RD, and RP values initially increased, then decreased, and then slightly increased from Southeast to Northwest China. These results proved that the RA increased with the increase of light rain in Northwest China and heavy rain in Southeast China. In addition, changes in the monsoon have altered the rate at which RA, RD, and RP vary with distance from the sea. These findings may help to provide suggestions for the rational spatial utilization of water resources in China.
Highlights
Global warming may accelerate the hydrological cycle [1,2,3,4]
Changes in the monsoon have altered the rate at which rainfall amount (RA), rainfall days (RD), and RP vary with distance from the sea
RA and RP increased from the FZ to NC stations and decreased sharply at QD (Figure 7)
Summary
Global warming may accelerate the hydrological cycle [1,2,3,4]. The accelerated hydrological cycle will affect the spatiotemporal patterns of precipitation, including the frequency of extreme precipitation events [5,6]. The frequent occurrence of extreme precipitation makes disasters, such as floods and droughts, more serious, which affects agricultural production and causes catastrophic destruction [7,8,9,10]. Many researchers have found that the intensity of precipitation events and the occurrence of extreme events have increased globally, the spatiotemporal changes of precipitation in different regions of the world have not been the same [11,12,13].
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