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北大西洋涛动活动中心空间位移年际年代际变化
  • ISSN号：0023-074X
  • 期刊名称：《科学通报》
  • 时间：0
  • 分类：P732.6[天文地球—海洋科学]
  • 作者机构：[1]兰州大学西部环境教育部重点实验室,兰州730000, [2]Institute of Geosciences, University of Kiel, Kiel D-24118, Germany
  • 相关基金：国家重点基础研究发展计划（2010CB950204）;国家自然科学基金创新群体项N（40721061）和国家引智创新群体计划（B06026）资助
作者： 张肖剑[1], 靳立亚[1,2], 陈春珠[1], 管东升[1], 李明治[1]
关键词： 北大西洋涛动, 空间位移, 年际变化, 年代际变化, 纬向风
中文摘要：

利用Twentieth Century Reanalysis（V2）月平均再分析资料，通过对冬季平均海平面气压（SLP）距平场上北大西洋涛动（NAO）活动中心空间位置的直接确认，建立4个NAO空间位移指数反映NAO活动中心空间位移特征，发现NAO南北活动中心的经向位移趋势与纬向位移表现非常一致，表现为NAO活动中心往往沿着西南．东北方向移动．多窗谱分析显示，NAO空间位移指数的周期主要集中在2-6年，与NAO指数的高频变化存在共同的2～3年的振荡周期．在年代际变化上，NAO指数与NAO空间位移指数有显著的正相关关系．但在年际变化上，NAO指数与NAO北活动中心纬向位移的关系却并不显著．NAO指数与NAO活动中心年际变化的联系很可能是通过天气尺度的Rossby波破碎（RWB）产生作用的，在NAO正（负）位相阶段，伴随着反气旋性波破碎（气旋性波破碎）事件，NAO活动中心偏北（南），且NAO南活动中心偏东（西），而NAO北活动中心在纬向上没有发生明显偏移．虽然北大西洋地区平均纬向风强度与NAO空间位移指数存在显著的正相关关系，但这很可能只是NAO指数对NAO活动中心空间位移影响的外在表现．

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期刊信息
  • 《科学通报》
  • 北大核心期刊（2011版）
  • 主管单位:中国科学院
  • 主办单位:中国科学院
  • 主编：周光召
  • 地址：北京东黄城根北街16号
  • 邮编：100717
  • 邮箱：csb@scichina.org
  • 电话：010-64036120 64012686
  • 国际标准刊号：ISSN：0023-074X
  • 国内统一刊号：ISSN：11-1784/N
  • 邮发代号:80-213
  • 获奖情况:
  • 首届国家期刊奖,中国期刊方阵“双高”期刊,第三届中国出版政府奖
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  • 被引量:81792