1956—2016年中国降水量时空分布规律及变化特征

Spatial-temporal distribution and variation characteristics of precipitation in China during 1956—2016

  • 摘要: 为应对气候变化背景下降水时空演变对经济社会发展和生态环境保护带来的挑战,本文基于第三次全国水资源调查评价1956—2016年逐月降水量观测数据,全面剖析了降水量在全国、水资源一级区、省级行政区的空间分布规律以及年际变化、年内分配等时间分布特征,探讨了降水时空分布的变化趋势。结果表明:中国南方地区多年平均年降水深为1215.1 mm,北方地区仅329.3 mm;各水资源一级区均出现连枯连丰现象,降水量越少的区域年际变化越显著;北方地区连续最大4个月降水量占多年平均年降水量的70%~80%,南方地区则占50%~65%;1956—2016年全国降水量呈现出丰枯交替的现象,整体变化趋势未发生明显变化。

     

    Abstract: The spatial and temporal distribution of precipitation in the context of climate change poses significant challenges to socioeconomic development and the protection of the eco-environment. This paper comprehensively analyzed the spatial distribution of precipitation in China based on observational monthly precipitation data from the third national water resources investigation and evaluation, covering the period from 1956 to 2016. It examined the distribution across various primary water resource districts and provincial administrative regions. Next, the temporal distribution characteristics, including interannual changes and annual distribution patterns, were examined. Finally, the variation of the spatial and temporal distribution of precipitation was explored. The results revealed that the average annual precipitation depth in Southern China was 1215.1 mm, while that in Northern China was only 329.3 mm. The phenomenon of consecutive wet and dry years occurred in all primary water resource districts, and the interannual change was more significant in regions with less precipitation. The maximum precipitation in four consecutive months accounted for 70%–80% of the average annual precipitation in the Northern region and 50%–65% in the Southern region. National precipitation exhibited an alternating wet and dry pattern, with no significant overall change trend from 1956 to 2016.

     

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