| 冬季北极涛动与极涡的变化分析 |
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| 引用本文： | 邓伟涛,孙照渤.冬季北极涛动与极涡的变化分析[J].南京气象学院学报,2006,29(5):613-619. |
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| 作者姓名： | 邓伟涛 孙照渤 |
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| 作者单位： | 南京信息工程大学,大气科学系,江苏,南京,210044 |
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| 摘 要： | 利用NCEP／NCAR资料计算出冬季极涡面积（PVA）指数和极涡强度（PVI）指数，对冬季北极涛动（AO）和北半球500hPa极涡指数进行周期分析，讨论了冬季AO与极涡的年际、年代际变化。结果表明：冬季AO指数与PVA指数呈反相关关系，与PVI指数呈正相关关系，且AO指数呈上升趋势，PVA指数呈下降趋势。冬季AO指数、PVA指数以及PVI指数均具有多重周期。强（弱）AO指数年，极地500hPa高度场降低（升高），PVI指数偏大（偏小），PVA指数偏小（偏大）。500hPa高度场上亚洲大槽、北美大槽均减弱（加强）。AO可激发出类似EU遥相关型的异常，从而影响到东亚地区的气候。冬季AO指数在1982年发生突变，且突变后北太平洋地区的正中心位置更靠东，强度更大。此外，AO突变前后极涡变化不是很显著。
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| 关 键 词： | 北极涛动 极涡 年际变化 年代际变化 |
| 文章编号： | 1000-2022（2006）05-0613-07 |
| 收稿时间： | 06 29 2004 12:00AM |
| 修稿时间： | 2004-06-292004-12-31 |
Variational Analysis of Arctic Oscillation and Polar Vortex in Winter |
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| DENG Wei-tao,SUN Zhao-bo.Variational Analysis of Arctic Oscillation and Polar Vortex in Winter[J].Journal of Nanjing Institute of Meteorology,2006,29(5):613-619. |
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| Authors: | DENG Wei-tao SUN Zhao-bo |
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| Institution: | Department of Atmospheric Sciences,NUIST,Nanjing 210044,China |
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| Abstract: | Using the NCEP/NCAR data,we can calculate wintertime polar vortex area(PVA) index and polar vortex intensity(PVI) index.And in terms of these indexes and Arctic oscillation(AO) index,we can get their periodic analysis and analyze the inter-annual and inter-decadal variations of the wintertime(DJFM) AO and North Hemisphere 500hPa polar vortex.The result shows that there is negative correlation between wintertime AO and PVA index,and positive correlation between wintertime AO and PVI index.The AO index has the ascending tendency while the PVA index is descending.And all these indexes have multi-periods.In the year of higher(lower) phase,500hPa height decreases(increases) in the north polar region,and PVI index is stronger(weaker) and PVA index is weaker(stronger).At the same time,both the Asian trough and the North American trough become weaker(stronger) at the 500hPa height field.The AO can make the anomaly like the EU teleconnection,so it can influence East Asia climate.We also find the AO index has an abrupt climate change in 1982,the AO mode's positive center in the North Pacific regions moves eastward and becomes stronger after the change.Furthermore,the influence of the AO's inter-decadal variation on the polar vortex is not more obvious than that of the AO's inter-annual variation. |
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| Keywords: | Arctic oscillation polar vortex inter-annual variation inter-decadal variation |
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