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| 热带印度洋春季海表温度异常与南海夏季风强度变化的关系 | |
| 引用本文： | 李东辉,朱益民,谭言科,张瑰.热带印度洋春季海表温度异常与南海夏季风强度变化的关系[J].气候与环境研究,2006,11(4):514-524. |
| 作者姓名： | 李东辉 朱益民 谭言科 张瑰 |
| 作者单位： | 1. 中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室,北京,100029;南京军区气象水文中心,南京,210016 2. 解放军理工大学气象学院,南京,211101 3. 解放军理工大学理学院,南京,211101 |
| 基金项目： | 国家自然科学基金资助项目40405010、40233028，大气科学和地球流体力学数值模拟国家重点实验室开放课题 |
| 摘 要： | 利用50年的Reynolds月平均海表温度资料和NCEP/NCAR全球大气再分析资料,分析了热带印度洋春季海温异常对南海夏季风强度变化的影响。结果表明:1)热带印度洋春季海表温度距平(SSTA)的模态主要是全区一致型(USBM)和热带南印度洋偶极型(SIODM),USBM模态既有年际时间尺度的变化特征,又有年际以上时间尺度的变化特征,既包含有对冬季ENSO信号响应的变化特征,又有独立于ENSO的变化特征;SIODM模态主要表现为独立于ENSO的年际时间尺度变化。2)USBM模态与南海夏季风强度变化呈显著负相关关系,且二者都是对冬季ENSO信号的响应,USBM模态的年际变化不能独立于ENSO信号影响南海夏季风的强度变化。3)经(1~8年)带通滤波及去除ENSO信号的热带印度洋春季SSTA的SIODM型分布是影响南海夏季风强度变化的主要模态,表现为热带东南印度洋为负(正)、其他海区为正(负)时,南海夏季风强度增强(减弱),大气环流对热带东南印度洋SSTA热力作用的响应是造成这一关系的直接原因,SIODM型的SSTA分布与南海夏季风年际异常关系在热带印度洋长期变化趋势的暖位相期显著,在长期变化趋势的冷位相期不显著。 |
| 关 键 词： | 热带印度洋 春季 海表温度 南海夏季风 |
| 文章编号： | 1006-9585（2006）04-0514-11 |
| 收稿时间： | 2005-01-25 |
| 修稿时间： | 2005-01-252006-03-07 |
Relationships between Spring Ocean Sea Surface Temperature Anomalies in the Tropical Indian Ocean and the Strength of South China Sea Summer Monsoon |
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| LI Dong-Hui,ZHU Yi-Min,TAN Yan-Ke and ZHANG Gui.Relationships between Spring Ocean Sea Surface Temperature Anomalies in the Tropical Indian Ocean and the Strength of South China Sea Summer Monsoon[J].Climatic and Environmental Research,2006,11(4):514-524. | |
| Authors: | LI Dong-Hui ZHU Yi-Min TAN Yan-Ke and ZHANG Gui |
| Institution: | 1. State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029; 2. Meteorological and Hydrological Center of Military Area Command of Nanjing, Nanjing 210016; 3. Institute of Meteorology, PLA University of Science and Technology, Nanjing 211101; 4. Institute of Science, PLA University of Science and Technology, Nanjing 211101 |
| Abstract: | The impacts of spring tropical Indian Ocean Sea Surface Temperature(SST) anomalies on the strength of South China Sea summer monsoon(SCSSM) are investigated by analyzing 50 a Reynolds monthly mean SST data and NCEP/NCAR atmospheric reanalysis data.The main conclusions are as follows.1) There are two dominant modes of spring SST anomalies in the tropical Indian Ocean,the Uniformly Signed Basin-wide Mode(USBM) and the tropical South Indian Ocean Dipole Mode(IODM),respectively.The SST anomalies associated with USBM vary at both interannual and interdecadal time scales,involving ENSO-dependent as well as ENSO-independent variability,while the SST anomalies associated with SIODM mainly vary on interannual time scale,characterizing by ENSO-independent variability.2) The USBM exhibits significant negative correlation with the strength of SCSSM,both appears to be the response to winter ENSO events.3) The SIODM with variations below 1-8 year band-filtered and ENSO signal removed is the dominant mode that exerts impact on the variation of intensity of SCSSM.Accompanied with the negative(positive) SST anomalies in tropical South-eastern Indian Ocean and positive(negative) elsewhere,the SCSSM is strengthened(weakened).The mechanism responsible for this could be attributed to the direct response of atmospheric circulation to thermal forcing of SST anomalies in the tropical South-eastern Indian Ocean.In addition,the relationship between the interannual variability of SIODM and that of SCSSM is significant during the warm phase of secular trend but insignificant during the cool phase. |
| Keywords: | tropical Indian Ocean spring sea surface temperature South China Sea summer monsoon |
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