印度洋热含量在南海夏季风爆发中的作用
收稿日期: 2009-11-27
修回日期: 2010-07-07
网络出版日期: 2011-09-08
基金资助
中国极地科学战略研究基金项目(20080218)
The impact of springtime heat content in the Indian Ocean on the South China Sea summer monsoon onset
Received date: 2009-11-27
Revised date: 2010-07-07
Online published: 2011-09-08
利用 Scripps 海洋研究所 0—400m 上层海洋热含量资料和美国环境监测中心/国家大气研究中心(National
Centers for Environmental Prediction /National Center for Atmospheric Research, NCEP/NCAR)的再分析资料, 运用
经验正交分解(empirical orthogonal function, EOF)等统计方法, 研究在有 ENSO 影响和去除 ENSO 影响的情况下,
前期春季印度洋热含量如何影响南海夏季风爆发。结果表明, 在没有扣除 ENSO 信号的情况下, 热带印度洋热含
量 EOF 分解第一模态呈东西相反变化的空间分布。印度洋东部热含量为正(负)异常、西部为负(正)异常时, 南海
夏季风爆发较早(晚), 印度洋上层热含量主要通过影响热带印度洋上空大气的垂直运动和高低层辐散辐合, 进而
影响季风纬向环流的强弱, 来影响南海夏季风爆发的早晚。在扣除 ENSO 信号的情况下, 印度洋热含量 CEOF
(conditional EOF)第一模态的空间分布类似于 EOF 第一模态的空间分布; 第二模态表现为除小部分海区外, 热带
印度洋热含量呈一致变化的海盆模态。这两个模态对南海夏季风爆发的作用表现出不确定性。
于乐江 ,冯俊乔 , . 印度洋热含量在南海夏季风爆发中的作用[J]. 热带海洋学报, 2011 , 30(4) : 8 -15 . DOI: 10.11978/j.issn.1009-5470.2011.04.008
The impact of springtime heat content in the Indian Ocean on the South China Sea (SCS) summer monsoon onset is
investigated using Empirical Orthogonal Function (EOF). The author uses 0-400 m upper-ocean heat content data from the
Scripps Institution of Oceanography and meteorological data from the National Centers for Environmental Prediction/National
Center for Atmospheric Research (NCEP/NCAR). The results show that under the influence of El Niño-Southern Oscillation
(ENSO) EOF1 of the heat content has a pattern of sea-saw variation between the eastern and western Indian Ocean. When the
heat content is positively anomalous in the eastern Indian Ocean and negatively anomalous in the western Indian Ocean, the
SCS summer monsoon has an early onset; otherwise the onset is delayed. The mechanism is that the heat content pattern in the
Indian Ocean affects the vertical movement and divergence field of upper and lower atmosphere over the tropical Indian Ocean
as well as the strength of zonal wind, leading to early or late onset of the SCS summer monsoon. The spatial pattern of condi-
tional EOF1 (CEOF1) of the heat content is similar to that of EOF1, while the spatial pattern of CEOF2 displays a uniform
pattern except for a small region. The relative importance of the two modes gives uncertainty of their influence on the SCS
summer monsoon onset.
Key words: Indian Ocean; heat content; South China Sea summer monsoon
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