双月刊

ISSN 1006-9895

CN 11-1768/O4

三江源地区冬季降水年代际变化特征及相关物理机制
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作者单位:

1.西藏昌都市气象局;2.南京信息工程大学气象灾害教育部重点实验室/气象灾害预报预警与评估协同创新中心;3.西藏自治区气象台

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基金项目:

省自然科学基金,国家自然科学基金


Interdecadal variations of winter precipitation over the Three River Source region in China and associated physical mechanisms
Author:
Affiliation:

1.Key Laboratory of Meteorological Disaster,Ministry of Education KLME/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters CIC-FEMD,Nanjing University of Information Science and Technology;2.Meteorological Observatory of Tibet Autonomous Region;3.Qamdo Meteorological Service,Meteorology Bureau of Tibet Autonomous Region

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    摘要:

    本文主要利用1961/1962~2006/2007年CN05.1资料和NCEP/NCAR再分析资料,研究三江源地区(以下简称三江源)冬季降水的年代际变化特征及相关物理机制。结果表明:三江源冬季降水在20世纪80年代末期经历了一次由少到多的年代际增多。三江源冬季降水的年代际变化受乌拉尔山上空异常低压和贝加尔湖―中国东北部上空异常高压影响,与中高纬北大西洋海气相互作用有关。从20世纪80年代末期开始,中高纬北大西洋海温异常增暖可以导致海表面上空上升运动异常,对流活动增强,激发向东传播的大气环流波列,引起乌拉尔山上空的异常低压和贝加尔湖―中国东北部上空的异常高压。在异常低压与异常高压的影响下,极锋急流南移加强,引起三江源高空辐散,对流活动增强,导致三江源冬季降水增多;另一方面,贝加尔湖―中国东北部上空异常高压还可以通过引起三江源上空异常东风,引起三江源水汽通量辐合异常,导致冬季降水增多。此外,印度洋海温异常增暖可能通过影响南支槽强度变化,进一步调制三江源冬季降水。

    Abstract:

    This study investigates the interdecadal variations of winter precipitation and associated physical mechanisms over the Three River Source (TRS) region based on gridded CN05.1 and NCEP/NCAR reanalysis datasets for the period of 1961/1962–2006/2007. Results indicate that the winter precipitation over the TRS region experienced an intensification in the late 1980s. The decadal changes are modulated by the anomalous low over the Ural Mountains and the anomalous high extending from Lake Baikal to Northeast China, which may be associated with the ocean–atmosphere interaction over the North Atlantic. Specifically, after the late 1980s, the warm SST anomalies over the mid-high latitudes of North Atlantic can contribute to the abnormal ascending motions, strengthening the convection over that region and triggering the eastward wave train, causing the anomalous low over the Ural Mountains and the anomalous high extending from Lake Baikal to Northeast China. On the one hand, the coincidence of anomalous low and high induced the enhancement and southward shift of the polar front jet, causing the upper-level divergence and development of convection over the TRS region. On the other hand, the anomalous easterly wind over the TRS caused by the anomalous high extending from Lake Baikal to Northeast China, influenced the decadal intensification of winter precipitation over the TRS via inducing the abnormal convergence of water vapor flux. In addition, the warm SST anomalies in the Indian Ocean may also have influence on the interdecadal variations of winter precipitation over the TRS region by affecting the south branch trough.

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历史
  • 收稿日期:2022-02-10
  • 最后修改日期:2022-04-06
  • 录用日期:2022-06-10
  • 在线发布日期: 2022-06-15
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