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2007/2008和2008/2009冬季平流层强、弱极涡事件对应的行星波活动的对比分析

邓淑梅 陈月娟 易明建

邓淑梅, 陈月娟, 易明建. 2007/2008和2008/2009冬季平流层强、弱极涡事件对应的行星波活动的对比分析[J]. 大气科学, 2015, 39(2): 433-444. doi: 10.3878/j.issn.1006-9895.1405.14124
引用本文: 邓淑梅, 陈月娟, 易明建. 2007/2008和2008/2009冬季平流层强、弱极涡事件对应的行星波活动的对比分析[J]. 大气科学, 2015, 39(2): 433-444. doi: 10.3878/j.issn.1006-9895.1405.14124
Deng Shumei, Chen Yuejuan, Yi Mingjian. A Comparative Analysis of Planetary Wave Activities for the 2007/2008 Strong Polar Vortex and the 2008/2009 Weak Polar Vortex[J]. Chinese Journal of Atmospheric Sciences, 2015, 39(2): 433-444. doi: 10.3878/j.issn.1006-9895.1405.14124
Citation: Deng Shumei, Chen Yuejuan, Yi Mingjian. A Comparative Analysis of Planetary Wave Activities for the 2007/2008 Strong Polar Vortex and the 2008/2009 Weak Polar Vortex[J]. Chinese Journal of Atmospheric Sciences, 2015, 39(2): 433-444. doi: 10.3878/j.issn.1006-9895.1405.14124

2007/2008和2008/2009冬季平流层强、弱极涡事件对应的行星波活动的对比分析

doi: 10.3878/j.issn.1006-9895.1405.14124
基金项目: 国家重点基础研究发展计划(973计划)项目2010CB428603, 国家自然科学基金项目41105031, 淮河流域气象开放研究基金项目HRM201103

A Comparative Analysis of Planetary Wave Activities for the 2007/2008 Strong Polar Vortex and the 2008/2009 Weak Polar Vortex

  • 摘要: 在对逐日气象资料进行纬向谐波分析的基础上, 对比和讨论了2007/2008年冬季强极涡期间和2008/2009冬季弱极涡期间平流层和对流层不同波数的行星波的变化特征, 特别关注强极涡或弱极涡发生之后, 500 hPa 沿60°N和30°N行星波1波和2波振幅和位相的差异, 以及相应的500 hPa位势场的差异, 进而讨论为什么不同的平流层极涡异常会对东亚有不同的影响, 特别讨论为什么同一种极涡异常, 对我国南北方近地面气温的影响会不同。结果表明:平流层极涡发生异常时, 平流层行星波活动有明显的异常。随着极涡异常的下传, 对流层行星波的振幅和位相也有明显的变化, 而且, 对于不同的纬度带, 其变化又有不同, 表现为:2008年1月强极涡发生之后, 500 hPa行星波1波和2波的扰动都向南伸, 而2009年1月的弱极涡(SSW)期间和之后, 1波和2波的扰动都偏北; 在对流层, 强极涡和弱极涡发生之后不但行星波1波和2波的振幅有所差异, 其位相也有明显的不同。特别是, 其位相的差异还随纬度而变化。就同一年(或者说对于同是强极涡或者同是弱极涡)而言, 无论是1波还是2波, 在60°N和30°N附近的扰动相比, 几乎反位相。这样就使得它们的500 hPa 位势场也有明显不同:在东半球, 主要表现为乌拉尔高压和东亚大槽的强度和位置不同。2008年1月强极涡发生之后, 乌拉尔高压和东亚大槽东移, 不利于冷空气向欧亚大陆北部(包括我国北方)的输送, 使这些地区的温度偏高;而2009年1月弱极涡之后, 东亚大槽西退, 利于冷空气向欧亚大陆北部输送, 导致这些地区较冷。对于同一种极涡异常(如2008强极涡或者2009弱极涡)由于南方和北方行星波扰动的位相不同, 对南方和北方冷暖空气的输送也就不一样。所以同一种极涡异常对(我国)南北地区的温度影响是不同的。
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出版历程
  • 收稿日期:  2014-02-10
  • 修回日期:  2014-05-26

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