马贤梅, 张云瑾. 沃克环流受阻对厄尔尼诺现象有正反馈作用[J]. 云南大学学报(自然科学版), 2014, 36(S1): 103-111. doi: 10.7540/j.ynu.20140140
引用本文: 马贤梅, 张云瑾. 沃克环流受阻对厄尔尼诺现象有正反馈作用[J]. 云南大学学报(自然科学版), 2014, 36(S1): 103-111. doi: 10.7540/j.ynu.20140140
Walker circulation has positive feedback effectto to El Nnino[J]. Journal of Yunnan University: Natural Sciences Edition, 2014, 36(S1): 103-111. DOI: 10.7540/j.ynu.20140140
Citation: Walker circulation has positive feedback effectto to El Nnino[J]. Journal of Yunnan University: Natural Sciences Edition, 2014, 36(S1): 103-111. DOI: 10.7540/j.ynu.20140140

沃克环流受阻对厄尔尼诺现象有正反馈作用

Walker circulation has positive feedback effectto to El Nnino

  • 摘要: 以1982年的厄尔尼诺现象为研究对象,以正常年份1980年为比较标准,绘出两年间太平洋地区的200hPa和500hPa高空西风带,低层850hPa东风,得出垂直速度环流,并逐步比较分析垂直环流各个阶段在发生时间上的先后关系和相关连性.可以看出,在西风作用下,沃克环流东移后部分翻越安第斯山,安第斯山阻挡了沃克环流的低层回退,促使太平洋上东风减弱,西部堆积的热水东扩,引起海平面升温.海平面升温又加剧气流上升,更多气流成为西风越过安第斯山,低层东风继续减小,海平面增温异常加强,厄尔尼诺现象爆发.安第斯山对回归的沃克环流的阻挡在厄尔尼诺现象发生过程中起到促进作用.

     

    Abstract: This article take 1982,El Nino as the object of study,take normal year in 1980 as quite standard,utilized the GrADS cartography method,drew during for two years 200hPa and the 500hPa upper air westerlies,the underlying 850hPa east wind,as well as graphs and so on vertical velocity circulation and sea-level temperature,and gradually comparative analysis each event in had in the time successively relations and correlational.Obtains east the Walker circulation the lag,the part surmounted the Andes under the westerly wind function,the Andes prevents the Walker circulation to return to draws back,urges on the Pacific Ocean the east wind to weaken,west piled up the hot water eastward expansion,caused the sea level elevation of temperature.The sea level elevates temperature intensifies the rise,the more air current overstepping summit,the east wind continues to reduce,warming exceptionally strengthens,El Nino eruption.The Andes mountain range has in the process to the return Walker circulation impediment in the El Nino,plays the regeneration role.

     

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