南太平洋副热带偶极子对南太平洋辐合带的影响

发布时间：2018-03-18 01:29

本文选题：南太平洋副热带偶极子　切入点：南太平洋辐合带　出处：《海洋科学》2016年10期 　论文类型：期刊论文

【摘要】：为研究南太平洋副热带偶极子的局地气候效应,利用Hadley中心的海温数据集Had ISST以及NCEP-NCAR的大气再分析数据,分析了南太平洋副热带偶极子(South Pacific Subtropical Dipole,SPSD)对南太平洋辐合带(South Pacific Convergence Zone,SPCZ)的影响,并探讨了相应的物理过程。研究结果显示,南太平洋副热带偶极子事件线性独立于ENSO(El Ni?o-Southern Oscillation)事件,有明显的季节锁相,于12~2月达到峰值并显著影响SPCZ降水带的位置。其中,正偶极子事件(简称"正事件")期间偶极子东北极区域(暖海温)水汽辐合上升,降水增多;而在偶极子西南极区域(冷海温)水汽辐散下沉,降水减少,因此SPCZ降水带偏北。负偶极子事件(简称"负事件")则相反,东北极降水减少的同时西南极降水增多,从而SPCZ降水带偏南。本研究关于SPSD与SPCZ关系的分析,将有助于更好地理解南太平洋的年际气候变异和海气相互作用。
[Abstract]:In order to study the local climate effects of subtropical dipoles in the South Pacific, Had ISST and NCEP-NCAR atmospheric reanalysis data from Hadley center are used. The effects of South Pacific Subtropical dipole on the South Pacific Convergence zonezag SPCZs in the South Pacific convergence zone are analyzed and the corresponding physical processes are discussed. The results show that the South Pacific subtropical dipole events are linearly independent of ENSO(El Ni2? The o-Southern Oscillation event, with obvious seasonal phase locking, reached its peak from 12 to February and significantly affected the location of the SPCZ precipitation zone. During the positive dipole event (referred to as the positive event), the water vapor convergence in the northeast polar region of the dipole (warm sea surface temperature) increased. The precipitation increased, while in the west Antarctic region of dipole (cold sea surface temperature) water vapor divergence and precipitation decreased, so the SPCZ precipitation zone was northward. The negative dipole event (referred to as "negative event") was on the contrary, and the precipitation in the northeast pole decreased while the precipitation in the western Antarctic increased. The analysis of the relationship between SPSD and SPCZ will contribute to a better understanding of the interannual climate variability and the air-sea interaction in the South Pacific.
【作者单位】：中国科学院海洋研究所;中国科学院大学;中国科学院海洋研究所海洋环流与波动重点实验室;青岛海洋科学与技术国家实验室海洋动力过程与气候功能实验室;
【基金】：中国科学院战略性先导科技专项(XDA11010102) 国家自然科学基金项目(41176017,41421005,41606018) 国家自然科学基金委员会-山东省人民政府联合资助海洋科学研究中心项目(U1406401)~~
【分类号】：P732

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