ZHANG Jianxuan,FAN Guangzhou,HUA Wei.Influence of the Western Pole of Indian Ocean Dipole on the First Landing of South Asia High to The Plateau[J].Journal of Chengdu University of Information Technology,2026,41(01):89-95.[doi:10.16836/j.cnki.jcuit.2026.01.012]
印度洋偶极子中西极子对南亚高压初登高原时间的影响
- Title:
- Influence of the Western Pole of Indian Ocean Dipole on the First Landing of South Asia High to The Plateau
- 文章编号:
- 2096-1618(2026)01-0089-07
- 分类号:
- P425
- 文献标志码:
- A
- 摘要:
- 为分析印度洋偶极子中的中西极子(IOD_W)对南亚高压初登高原时间的影响及可能机理,基于1979-2021年NCEP/NCAR逐日再分析资料和月平均IOD模态指数资料,采用回归分析和合成分析等方法,分析IOD_W对南亚高压初登高原时间的影响及可能机理。结果表明:(1)5-6月IOD_W与南亚高压初登高原时间呈显著的正相关关系,IOD_W越强(弱),南亚高压初登高原时间越晚(早)。(2)IOD_W对青藏高原周边热源强度存在显著影响,IOD_W负异常年,高原南坡上空热源在第30候即达到最强,而IOD_W正异常年,高原南坡热源强度与孟加拉湾东部热源强度差异并不明显。IOD_W负(正)异常年,高原南坡、孟加拉湾东部以及阿拉伯海东部热源强度显著偏强(偏弱)。(3)IOD_W可通过影响西南季风强度,进而导致季风降水产生差异,IOD_W正异常年,西南季风偏弱,高原南坡、孟加拉湾东部以及阿拉伯海东部季风降水偏少,降水异常偏少区域与热源异常偏弱区域一致,反之亦然。负异常年高原南坡较早成为全球主要热源中心,并在对流层高层高原南坡西侧激发异常反气旋,有利于南亚高压提早登陆高原,反之亦然。
- Abstract:
- To analyze the effect and possible mechanism of the western pole(IOD_W)in the Indian Ocean Dipole(IOD)on the first landing of the South Asian High(SAH)to the plateau. Based on the daily reanalysis data of NCEP/NCAR and the monthly-averaged IOD modal index data from 1979 to 2021, the influence of the IOD_W on the first landing of the SAH to the plateau and the possible mechanisms are analyzed by using the methods of regression analysis and synthetic analysis. The results show that:(1)the May-June IOD_W index is significantly positively correlated with the first landing of the SAH to the plateau, the stronger(weaker)the IOD_W is, the later(earlier)the first landing of the SAH is.(2)IOD_W has a significant influence on the intensity of heat sources around the Tibetan Plateau, the heat source over the south slope of the plateau reaches its strongest at 30th, while the difference between the intensity of heat sources over the south slope of the plateau and that over the east of the Bay of Bengal in the year of positive IOD_W anomaly is not obvious. In addition, the intensity of heat sources over the southern slope of the plateau, the eastern Bay of Bengal, and the eastern Arabian Sea are significantly stronger(weaker)in the years with negative(positive)IOD_W anomalies.(3)IOD_W can affect the strength of the southwest monsoon, which leads to the difference in monsoon precipitation, in the year of positive IOD_W anomalies, the southwest monsoon is weak, and the monsoon precipitation on the south slope of the plateau, the east of the Bay of Bengal, and the east of the Arabian Sea is low, and the areas of low precipitation anomalies coincide with the areas of weak heat source anomalies, and vice versa. In negative anomaly years, the southern slope of the plateau becomes a major global heat source center earlier and stimulates an anomalous anticyclone on the western side of the southern slope of the plateau in the upper troposphere, which favors the early landing of the SAH to the plateau, and vice versa.
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备注/Memo
收稿日期:2024-03-30
基金项目:国家自然科学基金资助项目(42075019、42275022); 第二次青藏高原综合科学考察研究资助项目(2019QZKK010203)
通信作者:华维.E-mail:huawei@cuit.edu.cn