近几十年印度洋偶极子变化趋势及其对我国夏季降水的影响
Variation of Indian Ocean Dipole and Its Effect on Summer Precipitation of China during Recent Decades
DOI: 10.12677/OJNS.2019.73034, PDF,    科研立项经费支持
作者: 宋光勇：成都信息工程大学大气科学学院，四川 成都
关键词: 印度洋偶极子；夏季降水；大气环流；Indian Ocean Dipole； Summer Precipitation； Atmospheric Circulation
摘要: 利用1961~2016年月降水量资料以及NCEP/NCAR月平均再分析资料进行了夏季印度洋偶极子(Indian Ocean Dipole, IOD)变化趋势及其对与同期中国降水的影响。研究发现，1961~2017年夏季IOD指数具有显著年际变化特征，整体呈现波动趋势，IOD与我国华南沿海及西北东部地区夏季降水间有较好的正相关关系。对大气环流分析表明，500 hPa位势高度场上我国东北到日本海低压槽强度减弱，低压槽控制区域降水减少；而副热带高压异常造成我国长江流域降水减少；此外，IOD还可通过影响东亚地区低层大气造成我国夏季降水产生异常。
Abstract: In this paper, we use the monthly precipitation and reanalysis data to analyze the variation of In-dian Ocean Dipole (IOD) and its effect on summer precipitation of China. The results showed that the summer IOD index has obviously fluctuation during the summer during 1961-2017, and there is a significant positive correlation between IOD and summer precipitation over the eastern part of the northwestern China and South China Sea. The analysis on atmospheric circulation shows that the high 500 hPa geopotential height field, the intensity of the trough weakened, the precipitation in the south-northeast area controlled by the trough decreased, the subtropical high weakened which caused decreasing of precipitation over Yangtze River basin. Moreover, IOD can also cause abnormal summer precipitation in China by affecting the lower atmosphere over East Asia.
文章引用：宋光勇. 近几十年印度洋偶极子变化趋势及其对我国夏季降水的影响[J]. 自然科学, 2019, 7(3): 247-253. https://doi.org/10.12677/OJNS.2019.73034

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