摘要
利用多年的Reynolds月平均海表温度资料和NCEP/NCAR全球大气再分析资料,分析了热带印度洋秋季海表温度距平(SSTA)与后期东亚冬夏季风强度变化的关系。结果表明,热带印度洋秋季SSTA的主要模态是全区一致(USB)型和偶极子(IOD)型,USB型模态主要代表热带印度洋秋季SSTA的长期变化趋势,而IOD型模态主要反映热带印度洋秋季SSTA的年际变化。热带印度洋秋季海温气候变率中既存在着明显的ENSO信号,也有独立于ENSO的变率特征,独立于ENSO的热带印度洋秋季SSTA变化的主要模态仍是USB型和IOD型。前期秋季USB模态与东亚冬季风及东亚副热带夏季风之间为负相关关系;与前期正(负)IOD模态相对应,南海夏季风强度偏弱(强),而东亚副热带夏季风强度偏强(弱)。USB型和IOD型模态对后期东亚冬、夏季风强度变化的影响是独立于ENSO的,但ENSO起到了调节二者相关显著程度的作用。
The relationships between autumn sea surface temperature （SST） anomalies in the tropical Indian Ocean and the strength of the East Asian winter and summer monsoons are investigated by analyzing Reynolds monthly SST dataset and NCEP/NCAR atmospheric reanalysis data. The results show that there are two dominant modes of autumn SST anomalies in the tropical Indian Ocean, the unanimous signed basin-wide （USB） mode and the Indian Ocean dipole （IOD） mode, respectively. The USB mode mainly shows a long term warming tendency of the tropical Indian Ocean, while the IOD mode reveals the interannual variations. mainly appear to the strength of t removal of ENSO-dependent variability, the SST anomalies in the tropical Indian Ocean the USB and IOD modes. The USB mode exhibits significant negative correlations with East Asian winter monsoon and the East Asian subtropical summer monsoon. When the positive （negative） IOD exists in the tropical Indian Ocean during the preceding boreal fall season, the South China Sea summer monsoon is weakened （strengthened）, and the East Asian subtropical summer monsoon is strengthened （weakened）. The relations of the dominant modes to the strength of the East Asian winter and summer monsoons are ENSO-independent variable, but the significance of the correlation can be modulated by ENSO.
出处
《热带海洋学报》
CAS
CSCD
北大核心
2006年第4期6-13,共8页
Journal of Tropical Oceanography
基金
国家自然科学基金项目(40405010)
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开放课题
关键词
热带印度洋
海表温度距平
东亚季风
ENSO
tropical Indian Ocean
sea surface temperature anomaly
East Asian monsoon
ENSO
