太平洋赤道不稳定波强度变化及其与ENSO的关系

发布时间：2017-12-28 12:11

本文关键词：太平洋赤道不稳定波强度变化及其与ENSO的关系　出处：《热带海洋学报》2016年03期 　论文类型：期刊论文

【摘要】：文章利用1991—2015年卫星海表温度(sea surface temperature,SST)研究了太平洋赤道不稳定波(tropical instability waves,TIWs)强度变化特征及其与厄尔尼诺?南方涛动现象(El Ni?o-Southern Oscillation,ENSO)的关系。首先采用带通滤波法将TIWs强度量化为赤道东太平洋SST的季节内(20~50d)波动振幅,发现强TIWs分布于尼诺3(Ni?o3)区域(150°W—90°W,5°S—5°N),平均强度达到0.2℃,赤道至3°N之间甚至超过0.35℃,在赤道南侧TIWS相对较弱,只在1998、2007、2010年3个拉尼娜(La Ni?a)年冬季达到0.2℃。文章不但证实La Ni?a年TIWs较强、厄尔尼诺(El Ni?o)年TIWs较弱的规律,而且发现TIWs强度与ENSO并非同相变化,TIWs强度变化超前ENSO 2~3个月,这是TIWs与Ni?o3区SST对ENSO相关赤道动力、热力过程反应时间差异所致,TIWs强度与赤道表层纬向流剪切强度以及冷舌锋面强度呈同期正相关,而Ni?o3指数滞后这2项指标2~3个月变化,三者都是ENSO循环的一部分。这意味着能够用卫星观测的TIWs活动(如SST)提前表征ENSO的位相和强度。
[Abstract]:Based on the sea surface temperature (SST) from 1991 to 2015, we studied the intensity variation characteristics of the Tropical Instability Waves (TIWs) in the Pacific Ocean and its relationship with the El Nino Southern oscillation phenomenon (El Ni o-Southern Oscillation). First, using band-pass filtering method for TIWs quantification of the equatorial eastern Pacific SST intraseasonal (20~50d) wave amplitude, strong TIWs distribution in Nino 3 (Ni? O3) region (150 - 90 degrees W degrees W, 5 degrees S and 5 degrees N), the average intensity reached 0.2 degrees, between the equator to 3 degrees N or even more than 0.35 degrees south of the equator, the TIWS is relatively weak, only in 1998, 2007, 2010 3 La Nina (La Ni? A) in winter to reach 0.2 degrees. This paper not only confirmed La Ni? A TIWs, El Nino years strong (El Ni? O) TIWs weak rules, and found that TIWs and ENSO did not change in strength, TIWs strength changes ahead of ENSO 2~3 months, this is TIWs and Ni? O3 SST ENSO related to the thermal and dynamic process of reaction time difference due to the TIWs intensity and the equatorial surface zonal flow shear strength and the strength is over the cold tongue front is related to the Ni? O3 index lag changes the 2 indexes of 2~3 months, three are part of the ENSO cycle. This means that TIWs activities (such as SST) can be used to characterize the phase and intensity of ENSO in advance.
【作者单位】：热带海洋环境国家重点实验室(中国科学院南海海洋研究所);中国科学院大学;中国海洋大学物理海洋学教育部重点实验室;
【基金】：国家自然科学基金项目(41376009、41521005、41525019) 中国科学院先导专项(XDA11010103)~~
【分类号】：P732
【正文快照】： 赤道不稳定波(TIWs)由赤道海洋内部不稳定性所引发,通常表现为卫星海表温度(SST)的锯齿状波动(Chelton et al,2000),在赤道东太平洋和赤道东大西洋最为明显。文中主要讨论赤道东太平洋的TIWs(图1)。春末夏初TIWs于赤道东太平洋90°W附近增强并向西传播,波长约为1000~2000km,周

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