太平洋沃克环流近几十年来的加强

发布时间：2018-05-15 16:53

本文选题：太平洋沃克环流 + 年代际变化　；参考：《热带海洋学报》2016年02期

【摘要】：太平洋沃克环流的强度随全球变暖而减弱,但有研究表明近几十年太平洋沃克环流呈增强趋势,两者是否矛盾?文章用1979年至2014年的再分析数据资料分析了近几十年来太平洋沃克环流强度的变化特征,各要素场均表明太平洋沃克环流的强度在过去几十年呈显著的增强趋势,且太平洋沃克环流的强度在年际变化尺度上与ENSO相关性很强。之前有关太平洋沃克环流的研究多局限于太平洋海盆内部,文章通过印太三极模态理论对太平洋沃克环流的年代际变化进行解释。研究发现,印度洋沃克环流与太平洋沃克环流存在同样的增强趋势。印太暖池海温、印度洋?太平洋沃克环流及海洋性大陆区域上升运动组成了一个简单的反馈系统,暖池海温的升高使海洋性大陆区域大气辐聚上升运动增强,两沃克环流随之增强;底层纬向风的增强使暖池区域的暖水堆积增多,从而使暖池区海温进一步升高,两沃克环流也进一步增强。同时近几十年太平洋年代际振荡(PDO)由暖位相到冷位相的转换导致中东太平洋海温降低,暖池增暖及中东太平洋变冷使太平洋海温梯度增加,最终导致太平洋沃克环流过去几十年的增强。
[Abstract]:The intensity of Pacific Walker circulation weakens with global warming, but some studies show that the Pacific Walker circulation is increasing in recent decades. Are the two contradictory? Based on the reanalysis data from 1979 to 2014, the variation characteristics of Pacific Walker circulation intensity in recent decades are analyzed. Each element field shows that the Pacific Walker circulation intensity has increased significantly in the past few decades. Moreover, the intensity of the Pacific Walker circulation is strongly correlated with ENSO on an interannual scale. Previous studies on the Pacific Walker circulation are mostly confined to the interior of the Pacific basin. In this paper, the Interdecadal variation of the Pacific Walker circulation is explained by the Indo-Pacific Tripole Mode Theory. It is found that the Walker circulation in the Indian Ocean and the Pacific Ocean have the same trend of enhancement. Sea Surface temperature in Indian warm Pool, Indian Ocean? The Pacific Walker circulation and the rising motion of the oceanic continental region form a simple feedback system. The rise of the warm pool SST makes the atmospheric radiative rising motion of the oceanic continental region increase, and the two walkers circulation increases accordingly. The enhancement of the zonal wind at the bottom makes the warm water accumulation increase in the warm pool area, thus the SST in the warm pool area is further increased, and the circulation of the two walkers is also further strengthened. At the same time, the transition of the Pacific Interdecadal Oscillation (PDO) from the warm phase to the cold phase leads to the decrease of SST in the Middle East Pacific Ocean, and the warming of the warm pool and the cooling of the Mideast Pacific Ocean increase the SST gradient in the Pacific Ocean. Ultimately, the Pacific Walker circulation has increased over the past few decades.
【作者单位】：中国人民解放军理工大学气象海洋学院;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);
【基金】：国家重点基础研究发展计划项目(2013CB956201) 国家自然科学基金项目(41275113)~~
【分类号】：P731.27

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