青藏高原东侧四川地区夜雨时空变化特征

胡迪; 李跃清

doi:10.3878/j.issn.1006-9895.1405.13307

青藏高原东侧四川地区夜雨时空变化特征

doi: 10.3878/j.issn.1006-9895.1405.13307

胡迪¹,
李跃清²

1.
成都信息工程学院, 成都610225;中国气象局成都高原气象研究所, 成都610072
2.
中国气象局成都高原气象研究所, 成都610072

基金项目: 国家重点基础研究发展计划(973计划)项目2012CB417202,国家自然科学基金项目41275051,公益性行业(气象)科研专项项目GYHY201106003、GYHY201206042

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出版历程
- 收稿日期: 2013-11-12
- 修回日期: 2014-05-27

Spatial and Temporal Variations of Nocturnal Precipitation in Sichuan over the Eastern Tibetan Plateau

HU Di¹,
LI Yueqing²

1.
Chengdu University of Information Technology, Chengdu 610225;Institute of Plateau Meteorology, China Meteorological Administration, Chengdu 610072
2.
Institute of Plateau Meteorology, China Meteorological Administration, Chengdu 610072

摘要

摘要: 本文利用四川地区1971～2012年29个气象站逐小时降水资料,计算四川地区雨季(5～9月)夜雨比例、夜雨强度和夜雨频次,并通过区域平均与趋势分析等统计方法,分析了其空间差异与时间变化特征,结果表明:(1)四川地区雨季夜雨占日降水量的比例较大,且具有显著的区域性差异,盆地西南部的夜雨占日降水量的比例最大,川西高原东北与川东北则为明显的两个低值区;(2)川东北地区雨季具有夜雨占日降水量的比例较小、夜雨发生概率也较低、但其夜雨强度却较大的特征,川西高原则与之相反,而盆地西南部的夜雨发生频次虽然不是很高,但夜雨强度和夜雨比例都较大;(3)42年平均四川地区雨季逐日变化,夜雨占日降水量的比例表现为先下降、后上升的特征,夜雨强度与夜雨比例相反,呈先上升、后下降的波动趋势,而夜雨频次的逐日变化呈现出明显的双峰特征;(4)四川地区夜雨比例、夜雨强度和夜雨频次的年变化具有一定差异。20世纪70、80年代,其夜雨频次和夜雨比例均较大,但呈减少趋势,而夜雨强度20世纪70年代较小,80年代较大,呈增大趋势。20世纪90年代,夜雨强度、频次和比例都处于较低状态;21世纪,夜雨强度和夜雨比例都开始明显增大,而夜雨频次增大相对滞后,其中,21世纪夜雨频次和夜雨比例波动明显。
- 夜雨 /
- 四川省 /
- 时空变化 /
- 气候特征
Abstract: Utilizing hourly precipitation data from the 29 weather stations in Sichuan Province from 1971 to 2012, preliminary regional average and trend analyses are conducted on the spatial and temporal variation characteristics of the nocturnal precipitation rate, intensity, and frequency during Sichuan's rainy season (from May to September). The main results are as follows: (1) There are prominent regional and vertical differences in the nocturnal precipitation. Specifically, the nocturnal precipitation rate reaches its maximum in the southwestern basin, whereas the northeastern Sichuan Plateau and northeastern basin are two areas with low precipitation rates. (2) In northeastern Sichuan, the nocturnal precipitation rate and frequency are low, but its intensity is greater. However, the western Sichuan Plateau presents very differently. In the southwest of the basin, nocturnal rain occurs infrequently, but with greater intensity and proportion. (3) The average daily nocturnal precipitation rate over 42 years first declined, and then increased. In contrast, the intensity of nocturnal precipitation showed a declining trend after rising, and the daily variation of the nocturnal rain frequency is clearly bimodal. (4) The annual variability of the rate, intensity, and frequency of nocturnal precipitation in Sichuan show some differences. Nocturnal precipitation frequency and rate are both are at a high level, but show a reducing trend in the 1970s and 1980s. The nocturnal precipitation intensity, in contrast, is low in the 1970s and high in the 1980s, showing an increasing trend. In the 1990s, the nighttime rainfall intensity, frequency, and proportion are all lower in value. In the 21st century, the intensity and proportion of the nocturnal rainfall are significantly increased, with the frequency increases lagging behind. The frequency and proportion of the nocturnal precipitation fluctuate prominently during this period.
- Nocturnal precipitation /
- Sichuan Province /
- Spatial and temporal variations /
- Climate characteristics

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