2000 年以来长江中下游梅雨降水变化的新特征

IF 3.3 Q2 ENVIRONMENTAL SCIENCES
Li-Sheng Hao, Yi-Hui Ding, Yan-Ju Liu
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引用次数: 0

摘要

本研究从降水量、降水阈值、大气环流年代际变化等方面全面分析了长江中下游梅雨的长期变化。研究结果表明,2000 年以来梅雨降水呈现出明显的新特征。(1)梅雨降水量呈明显的线性增加趋势,平均每 10 年增加 73.5 毫米。其中暴雨的增加最为明显,占总降水量增加的 61%,且所占比例不断增加,而小雨、中雨和大雨占总降水量的比例则不断下降。(2)在年代际尺度上,梅雨降水与当地地表平均气温呈相反变化。平均气温每升高 1℃,梅雨降水量就减少约 150 毫米。这种反相关关系在 2000 年以前并不明显。(3)该地区饱和比湿度呈显著上升趋势,表明该地区降水是由较高的大气饱和度和凝结阈值引起的,这可能是高温年份梅雨降水偏少的一个原因。(4)与梅雨相关的东亚主要大气环流呈现明显的年代际变化,包括北太平洋西部副热带高压和南亚高压明显变强,并分别向西和向东延伸,从而有利于梅雨降水的发生和持续。与梅雨相关的大气环流模式,如西北太平洋副热带高压和南亚高压,对梅雨降水的影响更为显著。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
New characteristics of Meiyu precipitation changes in the middle and lower reaches of the Yangtze River since 2000
This study comprehensively analyzed the long-term changes of Meiyu in the middle and lower reaches of the Yangtze River with regard to precipitation, precipitation threshold, and interdecadal changes in atmospheric circulation. Results revealed obvious new features of Meiyu precipitation since 2000. (1) Meiyu precipitation shows a significant linear increase trend, with an average increment of 73.5 mm every 10 years. The increase in torrential rain is the most significant, accounting for 61% of the total precipitation increase, and its proportion has been increasing, while the proportions of light, moderate, and heavy rain in the total precipitation have been decreasing. (2) At the interdecadal scale, Meiyu precipitation and the local surface average temperature show opposite changes. Meiyu precipitation decreases by approximately 150 mm for every 1°C increase in the average temperature. This inverse correlation was not evident before 2000. (3) The saturated specific humidity in this area shows a significant increasing trend, indicating that precipitation in this area is caused by a higher threshold of atmospheric saturation and condensation, which may be a reason for the low Meiyu precipitation during high-temperature years. (4) The main atmospheric circulation in East Asia associated with Meiyu shows clear interdecadal changes, including the Western North Pacific Subtropical High and South Asian High having become significantly stronger and having extended westward and eastward, respectively, thereby facilitating the occurrence and persistence of Meiyu precipitation. The atmospheric circulation patterns associated with Meiyu, such as the Western North Pacific Subtropical High and South Asian High, have more significant impacts on Meiyu precipitation.
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来源期刊
Frontiers in Climate
Frontiers in Climate Environmental Science-Environmental Science (miscellaneous)
CiteScore
4.50
自引率
0.00%
发文量
233
审稿时长
15 weeks
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