El Niño期间移动性海温场与大气环流相互关系的复奇异值分解

COMPLEX SINGULAR VALUE DECOMPOSITION OF THE RELATIONSHIP BITWEEN TYAVELL-ING SEA SURFACE TEMPERATURE AND GENERAL CIRCULATION DURING THE ELNINO

中文关键词:  CSVD方法  El Niño  移动性SST场  大气环流  OLR场  TBB场

英文关键词:CSVD method  El Nñio  Traveling SST field  OLR  TBB

中文摘要:

      利用1982～1983年北太平洋海温场、OLR场、TBB场和500hPa高度场的月均资料及复奇异值分解方法(CSVD)初步研究了移动性海温场与大气环流的相互关系,结果表明:(1)在1982～1983年,海温变化有很大的空间尺度,但各海区海温振荡的变化方向及变化程度存在差异,赤道中太平洋有持续的增暖过程,并有东传趋势,赤道太平洋地区存在海温场传播的“源”和“汇”;(2)OLR场和TBB场在低纬地区与SST场有密切联系,对流的加强基本和海温增暖变化相一致,热带对流活动在海气相互作用中有重要影响,但OLR场和TBB场所表现的振荡特征、移动特征和“源”“汇”特征是有差异的;(3)500hPa高度场的振幅和位相空间场中,振幅分布和位相梯度的指向说明了副热带高压南北进退的重要影响;(4)由奇异值的大小揭示的海气相互关系中,高度场与海温场的关系比OLR场、TBB场与海温场的关系更紧密;(5)在研究两个移动场的相互关系中,CSVD分解方法具有很强的特征浓缩性,具有诊断提取要素场中强信号及优势信号的能力,这说明CSVD方法值得推广.

英文摘要:

      By means of complex singular value decomposition (CSVD) and according to the monthly mean dataset of sea surface temperature (SST) over the North Pacific,observation of long-wave radiation (OLR),temperature of black body radiation (TBB) and 500 hPa height in the year of 1982～1983,primary study of the relationship between traveling SST fields and general circulation is carried out.Results show:(1) In the year of 1982～1983,the change of SST has a large space scare,but there is still differed of the change of direction and degree between each ocean.Such as,continuous process of heating exists in equator Pacific,and it may be spread to the East.Resource and converge of SST field spreading exist in equator Pacific.(2) In low latitudes area,OLR,TBB field and SST field are closely related.Strengthen of convection is nearly consistent with the change of SST heating.Tropical convection plays an important role in the interaction between ocean and atmosphere.(3) In the amplitude and phase space field of 500 hPa height,both amplitude distribution and phase gradient direction showed the impact by the forward and backward of subtropical high.(4) According to the relationship between ocean and atmosphere showed by the singular value,the relationship between 500 hPa height and SST field is closer than OLR,TBB field and SST field.(5) Calculation shows CSVD was very representative in the study on the relationship between the two traveling field,it also has the ability to diagnose and extract the middle-strong dignal and preferred signal from element field.CSVD method is valued to be spread.