中上新世是否存在“永久厄尔尼诺”状态——一个耦合模式结果  

PERMANENT El Nino-LIKE CONDITIONS DURING THE MIDDLE PLIOCENE?——A COUPLED MODEL RESULTS

作　　者：张冉[1] 姜大膀[1,2] 田芝平[2] 

机构地区：[1]中国科学院气候变化研究中心,北京100029 [2]中国科学院大气物理研究所竺可桢-南森国际研究中心,北京100029

出　　处：《第四纪研究》2013年第6期1130-1137,共8页Quaternary Sciences

基　　金：中国科学院战略性先导科技专项项目(批准号:XDB03020602);中国科学院知识创新工程重要方向项目(批准号:KZCX2-EW-QN202);国家自然科学基金项目(批准号:41175072和41222034)共同资助

摘　　要：根据中上新世模拟比较计划(PlioMIP)试验设计方案,利用通用气候系统模式(CCSM4)低分辨率版本就该时期是否存在"永久厄尔尼诺"状态给予了数值模拟研究。结果表明,相对于工业革命前期,中上新世海洋表面温度(SST)在赤道太平洋地区东部比西部增温显著,导致赤道太平洋地区东西方向上的SST梯度减弱;然而,模拟的中上新世热带太平洋SST仍然以厄尔尼诺/南方涛动(ENSO)循环为主,且ENSO循环并未减弱,换言之,试验结果不支持中上新世存在"永久厄尔尼诺"状态。There are still uncertainties for permanent E1 Nifio existing in Middle Pliocene. Based on the Pliocene Model Intercomparison Project, the scientific topic of whether or not permanent E1 Nifio exists in the mid-Pliocene is investigated using the Community Climate System Model version 4 （CCSM4）, a coupled ocean-atmosphere general circulation model. Model results show that the sea surface temperature （SST）warming is stronger in the eastern equatorial Pacific than that in the western equatorial Pacific,resulting in a reduced west to east SST gradient in the equatorial Pacific during the mid-Pliocene. Because of limited reduced SST gradient, the pattern with high SST in the western equatorial Pacific and low SST in the eastern equatorial Pacific does not change. Moreover,the regional change of other climate variables is also closely related with the changed west to east SST gradient in equatorial Pacific. Besides, the equatorial Pacific SSTs are also characterized by an E1 Nino-Southern Oscillation（ENSO） mode in the mid-Pliocene simulation and the ENSO in the mid-Pliocene is not weaker relative to the pre-industrial. In both mid-Pliocene and pre-industrial simulations, the period of ENSO is also similar to each other. In summary, model results show that permanent E1 Nino conditions do not exist in the mid-Pliocene.

关 键 词：中上新世 永久厄尔尼诺 CCSM4 数值模拟 

分 类 号：P467[天文地球—大气科学及气象学] P534.622