Temporal and spatial evolution of rainfall concentration and its influencing factors in Northwest China

被引：0
|
作者：
Jia L. [1 ]
Yu K. [1 ]
Deng M. [1 ]
Li P. [1 ,2 ]
Li Z. [1 ]
Shi P. [1 ,2 ]
Xu G. [1 ,2 ]
机构：
[1] State Key Laboratory of Eco-Hydraulics in Northwest Arid Region of China, Xi'an University of Technology, Xi'an
[2] Key Laboratory of National Forestry and Grassland Administration on Ecological Hydrology and Disaster Prevention in Arid Regions, Xi'an University of Technology, Xi'an
来源：
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | 2021年 / 37卷 / 16期
关键词：
Climate change; Influencing factors; Northwest China; Rainfall; Rainfall concentration; Temporal and spatial changes;
D O I：
10.11975/j.issn.1002-6819.2021.16.011
中图分类号：
学科分类号：
摘要：
This study aims to explore the temporal and spatial evolution of rainfall concentration against the global climate change in the Northwest region of China. Mann-Kendall trend test and change-point detection were carried out on a series of monthly raster rainfall data in the Northwest region from 1960 to 2017. Morlet wavelet was also used to analyze the periodic change in rainfall concentration. Moreover, a hotspot analysis was made on the spatial distribution and aggregation characteristics of rainfall concentration. A cross-wavelet analysis was used to explore the relationship between atmospheric circulation factors and rainfall concentration, thereby determining the influence of landform distribution on rainfall concentration. The results showed that: 1) The average rainfall concentration presented a decreasing trend in the Northwest region and the three sub-regions (subarea 1 which is in the west of "Qice Line", subarea 2 which is between "Yangguan Line" and "Qice Line", and subarea 3 which is between "Hu Line" and "Yangguan Line") from 1960 to 2017, where there were significant change-points (P<0.05). Specifically, the average rainfall concentration in subarea 1 showed a significant downward trend (P<0.05). The significant change-points in rainfall concentration of the entire study area were mainly concentrated in the 1980s, 1990s, and 2010s (P<0.05). Furthermore, the maximum multi-year average rainfall concentration was distributed in subarea 2. There was also uneven rainfall distribution during the year, indicating obvious seasonal changes. Some areas were abnormally concentrated or continued to decrease, thereby flatting the distribution of rainfall over the year in the future. 2) The average rainfall concentration varied greatly in the entire study area. Specifically, the three sub-regions from 1960 to 2017 presented a main cycle of about 40 a, and a secondary cycle of about 24 a. The overall cycle changes of rainfall concentration in the entire study area and three sub-regions remained the same, indicating no obvious difference. 3) There were cold and hot spots in the spatial distribution of rainfall concentration from 1960 to 2017. The rainfall concentration in cold spots showed a significant decreasing trend (P<0.05), while continued to decrease in the future. The rainfall concentration in hotspots presented an insignificant decreasing trend (P>0.05). The interannual variation was higher than that in cold spots. 4) North Atlantic Oscillation (NAO) and Pacific Decade Oscillation Index (PDO) presented a strong influence on the changes in rainfall concentration, where different atmospheric circulation factors had different effects on rainfall concentration. At the same time, the distribution difference of landform in Northwest China has a certain impact on the change of rainfall concentration. The rainfall concentration in the high mountainous landforms is the highest, with an average of 28.55. Consequently, much more attention can be paid to the influence of abnormal factors of atmospheric circulation on rainfall concentration, especially the distribution of rainfall in arid and semi-arid regions over the year. The findings can provide scientific support to ecological and environmental protection, as well as the response to water resources in the Northwest region. © 2021, Editorial Department of the Transactions of the Chinese Society of Agricultural Engineering. All right reserved.
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页码：80 / 89
页数：9
相关论文
共 40 条
  • [1] Li Zhe, Ding Yongjian, Chen Aijiao, Et al., Characteristics of warming hiatus of the climate change in Northwest China from 1960 to 2019, Acta Geographica Sinica, 75, 9, pp. 1845-1859, (2020)
  • [2] Kong Feng, Fang Jiayi, Liu Fan, Et al., Variations in the spatiotemporal patterns of precipitation concentration degree and precipitation concentration period from 1951 to 2012 in China, Journal of Beijing Normal University: Natural Science, 51, pp. 404-411, (2015)
  • [3] Huang Xiaoyan, Zhang Mingjun, Jia Wenxiong, Et al., Variations of surface humidity and its influential factors in Northwest China, Advances in Water Science, 22, 2, pp. 151-159, (2011)
  • [4] Zhang Yong, Chen Fahu, Gou Xiaohua, Et al., The temporal and spatial distribution of seasonal dry-wet changes over the Northwestern China: Based on PDSI, Acta Geographica Sinica, 11, pp. 1142-1152, (2007)
  • [5] Song Xiaomeng, Zhang Jianyun, Kong Fanzhe, Et al., Spatio-temporal variation characteristics of precipitation extremes in Beijing, Advances in Water Science, 28, 2, pp. 161-173, (2017)
  • [6] Han W, Xiao C D, Dou T F, Et al., Changes in the proportion of precipitation occurring as rain in Northern Canada during spring-summer from 1979-2015, Advances in Atmospheric Sciences, 35, 9, pp. 1129-1136, (2018)
  • [7] (1995)
  • [8] Wang Jijun, Pei Tiefan, Gu Wanlong, Et al., Non-uniformity index of annual precipitation distribution, Chinese Journal of Ecology, 9, pp. 1364-1368, (2007)
  • [9] Fan Jingjing, Variation Analysis of Hydrological Elements in Changing Environment, (2016)
  • [10] Huang Shengzhi, Du Meng, Li Pei, Et al., Investigation of the abrupt changes in precipitation concentration and the driving forces under the changing environment, Advances in Water Science, 30, 4, pp. 496-506, (2019)
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