1997/1998El Nio事件的热力学诊断分析  

The thermodynamic analysis of El Nio event in 1997/1998

作　　者：岳彩军[1,2,3] 陆维松[4] 曾刚[3] 王咏青[3,4] 

机构地区：[1]中国气象局上海台风研究所,上海200030 [2]中国气象局台风预报技术重点开放实验室,上海200030 [3]南京信息工程大学江苏省气象灾害重点实验室,南京210044 [4]南京信息工程大学大气科学学院,南京210044

出　　处：《气象科学》2008年第5期473-479,共7页Journal of the Meteorological Sciences

基　　金：国家自然科学基金项目(40875025、40405009、40075009、40205008);江苏省气象灾害重点实验室(南京信息工程大学)开放课题(KJS0602);上海市自然科学基金项目(08ZR1422900)

摘　　要：本文基于以925hPaNCEP／NCAR再分析风应力距平为初始强迫场的Zebiak-Cane海气耦合模式对1997／1998E1Nino事件集合预报平均结果，对1997／1998E1Nino事件进行热力学诊断分析。结果表明：（1）在整个E1Nino事件过程中，在赤道太平洋从西到东的各个Nino区中，平流作用主要起促进作用，而热力阻尼项则基本为衰减或抑止作用。（2）从Nino4区到Nino1＋2区，纬向平流对SSTA上升的促进强度变化不大，而经向平流和垂直上升流对SSTA增加的促进作用在逐渐增强。同时，热力阻尼项对SSTA变化的抑制作用也呈依次增强。（3）平流项中，经向平流的贡献相对湿著。Abstract Using the ensemble mean prediction results from Zebiak-Cane coupled ocean-atmosphere model based on NCEP/NCAR 925 hPa reanalysis of wind stress anomaly serving as initialization wind to 1997/1998 E1 Nino event, the 1997/1998 E1 Nino event is diagnosed on the basis of the thermodynamics. The results are as follows： （ 1 ） Advection term primarily plays an improving role, while the thermody- namic damping term basically plays a decaying or suppressing role in each Nino area during the E1 Nino event. （2） From Nino 4 to Nino 1 ＋ 2, the contribution of the zonal advection to SSTA increase varies lightly in such a way that the counterparts of the meridional advection and vertical upwelling flow increase gradually, meanwhile, the suppressing role of the thermodynamic damping term in SSTA increase be- comes stronger. （3） Further analysis indicates that zonal, meridional adveetion and vertical upwelling flow all play important roles in the evolution of 1997/1998 E1 Nino event, relatively, the contribution of meridional advection is the most notable.

关 键 词：1997/1998 E1 NINO事件 海表温度倾向方程 热力学诊断分析 

分 类 号：P434.1[天文地球—大气科学及气象学]