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
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共 40 条
  • [21] Xu G C, Zhang J X, Li P, Et al., Vegetation restoration projects and their influence on runoff and sediment in China, Ecological Indicators, 95, pp. 233-241, (2018)
  • [22] Fu C, Wang Q., The definition and detection of the abrupt climatic change, Chinese Journal of Atmospheric Sciences, 4, pp. 482-493, (1992)
  • [23] Zhang Huilan, Li Danxun, Jiang Xiaoming, Et al., Multiple-scale analysis of runoff-sediment tendency in Zhenjiangguan watershed based on stage characteristics, Journal of Hydroelectric Engineering, 32, 3, pp. 127-133, (2013)
  • [24] Pan Xiaodong, Li Pin, Feng Zhaozhong, Et al., Spatial and temporal variations in fertilizer use across prefecture-level cities in China from 2000 to 2015, Environmental Science, 40, 10, pp. 4733-4742, (2019)
  • [25] Shao Jun, Multi-scale correlation analysis of hydrological time series based on cross wavelet transform, Journal of Hydroelectric Engineering, 32, 2, pp. 22-26, (2013)
  • [26] Li Fuxing, Chen Dong, Tang Qiuhong, Variations of hydro-meteorological variables in the Yellow River basin and their relationships with the East Asian summer monsoon, Advances in Water Science, 26, 4, pp. 481-490, (2015)
  • [27] Cao Yongqiang, Liu Jiajia, Gao Lu, Relationship between sunspots and precipitation in Northwestern Liaoning in recent 54 years, Scientia Geographica Sinica, 35, 8, pp. 1027-1032, (2015)
  • [28] Dong Linyao, Zhang Pingcang, Liu Jigen, Et al., Combined influence of solar activity and ENSO on hydrological processes in Yoshino River basin, Japan, Advances in Water Science, 28, 5, pp. 671-680, (2017)
  • [29] Dai Meng, Huang Shengzhi, Huang Qiang, Et al., Dynamic assessments of drought multi-attribute risks and analysis of its driving force, Journal of Hydroelectric Engineering, 38, 8, pp. 15-26, (2019)
  • [30] Zhu Xiaojin, Zhang Qinghong, Orographic influence on precipitation of a Meso-Scale convective system over Taiwan on 7-8 June, 1998, Acta Scientiarum Naturalium Universitatis Pekinensis, 3, pp. 388-398, (2005)
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