双月刊

ISSN 1006-9895

CN 11-1768/O4

冬季12月和2月热带太平洋海温与东亚水汽输送关系的年代际变化机制研究
作者:
作者单位:

1.清华大学地球系统科学系;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.中国气象局乌鲁木齐沙漠气象研究所

作者简介:

通讯作者:

基金项目:

国家自然科学基金


The Interdecadal Variations and Physical Mechanisms of the Relationship between Tropical Pacific Sea Surface Temperature and East Asian Water Vapor Transport in December and February
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.Institute of Desert Meteorology,China Meteorological Administration

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
    摘要:

    利用1950~2019年NCEP/NCAR大气再分析资料、NOAA海表面温度资料以及ERA5垂直积分水汽通量资料,分析了冬季12月和2月热带中东太平洋海温与东亚水汽输送关系的年代际变化。结果表明,12月东亚上空经向水汽输送与热带中东太平洋海温的相关性在1980年代中期之前较弱,1980年代中期之后二者呈显著正相关;2月二者关系在1950~70年和1990~2010年呈显著正相关。12月东亚经向水汽输送与热带中东太平洋海温在1980年代中期之后呈显著正相关。包括两个原因,一方面是1986~2019年期间,热带中东太平洋海温通过太平洋-东亚(PEA)遥相关机制对12月东亚经向水汽输送的影响增强;另一方面是1986~2019年期间,12月热带中东太平洋海温通过影响环北半球遥相关型影响东亚水汽输送,当热带中东太平洋海温偏暖(冷)时,影响环北半球遥相关波列,导致东亚自南向北的水汽输送增强(减弱),该机制可增强PEA机制对东亚水汽输送的影响。2月东亚经向水汽输送与热带中东太平洋海温在1950~70年和1990~2010年呈显著正相关关系,主要是由于1950~70和1990~2010期间二者关系主要受PEA遥相关机制影响;而在1971~1989期间,2月热带中东太平洋海温可通过影响环北半球遥相关型影响东亚水汽输送,该机制可以部分抵消PEA机制对东亚水汽输送的影响,导致二者关系在此期间不显著。

    Abstract:

    Based on the NCEP/NCAR reanalysis data, the ERA5 vertical integrated water vapor flux data and the NOAA monthly mean sea surface temperature (SST) data, the interdecadal variations of the relationship between the central and eastern tropical Pacific SSTs and the East Asian water vapor transport (WVT) in December and February during 1950–2019 are investigated. The results indicate that the correlation between the East Asian meridional WVT and the central and eastern tropical Pacific SSTs in December was weak before the mid-1980s and significantly positive after the mid-1980s. The correlation in February was significantly positive during 1950–70 and 1990–2010. The interdecadal variations of the relationship between the East Asian meridional WVT and the central and eastern tropical Pacific SSTs in December are partly due to the fact that the East Asian meridional WVT was mainly modulated by the Pacific–East Asian (PEA) teleconnection during 1986–2019. The circumglobal teleconnection in the Northern Hemisphere, which would induce an anomalous southerly WVT over East Asia corresponding to warm SST anomalies in the central and eastern tropical Pacific, is another mechanism to influence the interdecadal variations of the relationship between the two in December during 1986–2019. The above mechanism enhanced the effect of the PEA teleconnection. The interdecadal variations of the relationship between the two in February are due to the fact that the connection between PEA teleconnection and the East Asian meridional WVT was enhanced during 1950–70 and 1990–2010. Whereas, the East Asian WVT was modulated by the circumglobal teleconnection in the Northern Hemisphere in February during 1971–89,corresponding to the cold SST anomalies in the central and eastern tropical Pacific, which is another mechanism causing the relationship between the two to be insignificant during 1971–89. The above mechanism opposed the effect of the PEA teleconnection.

    参考文献
    相似文献
    引证文献
引用本文
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2021-07-21
  • 最后修改日期:2022-02-07
  • 录用日期:2022-03-10
  • 在线发布日期: 2022-03-22
  • 出版日期: