南海夏季风爆发与冬春季南海上层海洋热含量关系的初探

王丽娟; 王辉; 金啟华; 殷占福

南海夏季风爆发与冬春季南海上层海洋热含量关系的初探

1.
中国气象局公共气象服务中心,北京 100081
2.
国家海洋环境预报中心,北京 100081
3.
中国气象科学研究院,北京 100081
4.
中国气象局行政管理局,北京 10008

基金项目: 国家自然科学基金项目(41076001;40531006)。

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出版历程
- 收稿日期: 2009-11-13

A preliminary analysis on the relationship between the South China Sea summer monsoon onset and the upper heat content during the previous period in this region

1.
CMA Public Weather Service Center, Beijing 100081, China
2.
National Marine Environmental Forecasting Center, Beijing 100081,China
3.
China Chinese Academy of Meteorology Science, Beijing 100081, China
4.
The administrative bureau of China Meteorological Administration, Beijing 100081, China

摘要

摘要: 利用1980年1月至2007年12月逐月的南海上层海洋热含量和逐层海温资料,分析了南海夏季风爆发早年和晚年前一年冬季和春季南海上层海洋热含量的时空分布特征及其与南海夏季风爆发的关系,并在此基础上,进一步探讨了热含量影响南海夏季风爆发早晚的可能原因。结果表明,南海上层海洋热含量的变化集中体现在中南部(8°~16°N,110°~120°E),而且热含量变化的信号在南海100~200 m之间最强。季风爆发早、晚年的冬春季,南海中南部热含量呈反位相变化。当南海夏季风早(晚)爆发,热含量为正(负)距平。南海夏季风爆发早晚与前期１~５月份南海中南部上层海洋热含量有显著负相关关系,尤其是3月份相关关系最好。当热含量为正(负)距平时,上层海洋异常得到(失去)热量,增大(减弱)了季风爆发前陆地冷海洋暖的海陆温差,有利于南海夏季风的早(晚)爆发。
- 南海 /
- 上层海洋热含量 /
- 南海夏季风
Abstract: Based on the monthly heat content and sea temperature datasets over the South China Sea (SCS) from January 1980 to December 2007, the temporal and spatial distribution characteristics of the heat content over SCS and its relationship with the onset of the summer monsoon(SCSM) was analyzed, after that, the possible contributions to the anomalous onset times of SCSM was further explored as well. It is showed that the main area of the upper layer heat content changes is located over the south central SCS (8°~16°N,110°~120°E), and the strongest signal of the heat content changes is kept in the subsurface (100~200 m) over the SCS. Compared with the early onset monsoon years, the features of the winter-spring heat content over the SCS holds the opposite polarity during the late onset years. The early (late) onset of the SCSM is accompanied by the positive (negative) heat content anomalies during the previous winter-spring except for December. Furthermore, it is also pointed out that the negative correlation coefficient peaks when the heat content anomalies lead the onset of the SCSM by 1~5 months, especially when the heat content anomaly is fixed in the previous March. Thus, the heat content in March over the south central SCS is a good premonitory signal for the onset of the SCSM. The positive (negative) heat content anomalies over the SCS as well as the positive (negative) upper ocean heat anomalies, which increase (decrease) the temperature gradient between ocean and land before the onset of the SCSM, are conducive to the early (late) onset of the SCSM eventually.
- South China Sea /
- the upper layer heat content /
- the South China Sea summer monsoon

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