利用国家气候中心提供的1951-2010年逐月环流指数资料， 分析了北半球极涡强度指数、 面积指数和中心强度指数的相关关系， 并通过极涡强度指数的变化讨论了冬季北半球极涡强度的时间变化特征。结果表明， 冬季极涡强度指数与面积指数和中心强度指数有较好的相关性， 能够更好地反映冬季极涡强度的变化特征； 冬季极涡存在准13年的年代际振荡周期， 准5年的年际振荡周期在20世纪90年代后期较为明显。结合气温、 降水观测资料和NCEP/NCAR月平均再分析资料， 探讨了极涡强\, 弱不同年份我国冬季气温、 降水和大气环流形势的变化。相对极涡弱值年而言， 极涡强值年我国北方地区、 东部地区特别是东北地区的气温偏高， 西南大部分地区的气温偏低， 长江流域和华南地区的气温变化不明显； 我国南方地区降水偏多， 长江中下游和华南地区的降水偏多最为明显， 北方地区的降水略有减少; 500 hPa 高度场上高纬度地区的位势高度降低， 中高纬度的位势高度升高， 冷空气向极地聚集， 东亚大槽减弱， 我国东北和东部地区的气温偏高； 同时东亚冬季风减弱， 湿空气向我国内陆输送， 长江流域和我国南方地区的降水偏多。
Abstract
Using the monthly circulation index data of National Climate Center from 1951 to 2010, the relationship among the intensity,area and central intensity indexes of the Northern Hemisphere polar vortex are analyzed. And the temporal variation features of the polar vortex intensity in winter werediscussed through the intensity index. The results show that the polar vortex intensity index has a good correction with the area index and the central intensity index, which can representthe change of the stratospheric polar vortex well in winter.The polar vortex mainly has a decadal oscillation period of 13 years and an interannual oscillation period of5 years after the 1990s. The changes of temperature, precipitation and the generalcirculation in winter are discussed by the observation data and monthly meanreanalysis data fromNCEP/NCAR. In relative strong years of polar vortex, the temperatures in North China and East China, especially in Northeast China are higher than thatof relative weak years of polar vortex. At the same time the temperature in most of Southwest China is lower, but ithas little change in the Yangtze River region and South China. And the precipitation is above normal in Southern China region especially in mid- and lower-reaches of the Yangtze River and South China, but belownormal in the North China.Besides, it can be found that the 500 hPa potential height is higher in the mid- and high-latitudes and lower in the high latitude, whilethe polar vortex is relative strong. The circulation implies that the East Asian winter monsoon and East Asian trough is weaker correspondingly. Under this situation, the cold air gathered around the polar and warm air flows to inland region, which causes the higher temperature in East China and Northeast China, and more precipitation in the southern China and the Yangtze River regions.
关键词
平流层 /
极涡 /
北极涛动 /
气温 /
降水
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Key words
Stratosphere /
Polar vortex /
Arctic Oscillation /
Temperature /
Precipitation
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参考文献
[1]Angell J K, Korshover J. Variation in size and location of the 300 mb North circumpolar vortex between 1963 and 1975[J]. Mon Wea Rev, 1977, 105(1): 19-25.
[2]Angell J K. Contraction of the 300-mb north circumpolar vortex during 1963-1997 and its movement into the Eastern Hemisphere[J]. J Geophys Res, 1998, 103(D20): 25887-25893.
[3]Thompson D W J, Wallace J M. The Arctic Oscillation signature in the wintertime geopotential height and temperature fields[J]. Geophys Res Lett, 1998, 25: 1297-1300.
[4]Baldwin M P, Dunkerton T J. Propagation of the Arctic Oscillation from the stratosphere to the troposphere[J]. J Geophys Res, 1999, 104: 30937-30946.
[5]Kodera K. On the origin and nature of the interannual variability of the winter stratospheric circulation in the Northern Hemisphere[J]. J Geophys Res, 1995, 100: 14077-14087.
[6]Thompson D W J, Lee S, Baldwin M P. Atmospheric Processes Governing the Northern Hemisphere Annular Mode / North Atlantic Oscillation[C]∥Hurrell J W, Kushnir Y, Visbeck M, et al. ed. The AGU Monograph on the NAO. 2002.
[7]Wallace J M, Thompson D W J. Annular modes and climate prediction[J]. Physics Today, 2002, 55: 29-33.
[8]Baldwin M P, Dunkerton T J. Stratospheric harbingers of anomalous weather regimes[J]. Science, 2001, 294: 581-584.
[9]Thompson D W J, Baldwin M P, Wallace J M. Stratospheric connection to Northern Hemisphere wintertime weather: Implications for prediction[J]. J Climate, 2002, 15: 1421-1428.
[10]Baldwin M P, Stephenson D B, Thompson D W J, et al.Stratospheric memory and skill of extended-range weather forecasts[J]. Science, 2003, 301: 636-640.
[11]Baldwin M P, Thompson D W J, Shuckburgh E F, et al. Weather from the stratosphere[J]. Science, 2003, 301: 317-318.
[12]张恒德, 高守亭, 刘毅. 极涡研究进展[J]. 高原气象, 2008, 27(2): 452-461.
[13]Chen W, Graf H F, Takahashi M. Observed interannual oscillations of planetary wave forcing in the Northern Hemisphere winter[J]. Geophys Res Lett, 2002, 29: 2073-2076.
[14]Chen W, Takahashi M, Graf H F. Interannual variations of stationary planetary wave activity in the northern winter troposphere and stratosphere and their relations to NAM and SST[J]. J Geophys Res, 2003, 108(D24): 4797-4811.
[15]严华生, 董慧林, 程建刚, 等.近51年500 hPa上北极涛动的时空变化特征分析[J].高原气象, 2005, 24(2): 187-195.
[16]杨小怡, 郭品文, 胡跃文.北极涛动的纬向对称结构[J].高原气象, 2005, 24(3): 404-409.
[17]龚道溢. 北极涛动对东亚夏季降水的预测意义[J]. 气象, 2006, 29(6): 3-6.
[18]张静, 朱伟军, 李忠贤. 北太平洋涛动与淮河流域夏季降水异常的关系[J]. 南京气象学院学报, 2007, 30(4): 546-550.
[19]陈永仁, 李跃清. 夏季北半球极涡与南亚高压东西振荡的关系[J]. 高原气象, 2007, 26(5): 1067-1076.
[20]龚道溢, 朱锦红, 王绍武. 长江流域夏季降水与前期北极涛动的显著相关[J]. 科学通报, 2002, 4(1): 546-549.
[21]琚建华, 任菊章, 吕俊梅. 北极涛动年代际变化对东亚北部冬季气温增暖的影响[J]. 高原气象, 2004, 23(4): 429-434.
[22]琚建华, 吕俊梅, 任菊章.北极涛动年代际变化对华北地区干旱化的影响[J]. 高原气象, 2006, 25(1):74-81.
[23]李春, 方之芳.北极涛动与东北冬季温度的联系[J].高原气象, 2005, 24(6): 927-934.
[24]何春, 何金海. 冬季北极涛动和华北冬季气温变化关系研究[J]. 南京气象学院学报, 2003, 26(1): 1-7.
[25]白爱娟, 翟盘茂. 中国近百年气候变化的自然原因讨论[J]. 气象科学, 2007, 27(5): 584-590.
[26]宋连春, 俞亚勋, 孙旭映, 等.北极涛动与我国北方强沙尘暴的关系[J].高原气象, 2004, 23(6): 835-839.
[27]刘毅, 赵燕华, 管兆勇.平流层环流异常对2008年1月雪灾过程的影响[J]. 气候与环境研究, 2008, 13(4): 548-555.
[28]陈月娟, 周任君, 邓淑梅, 等. 2008年雪灾同平流层环流异常的关系[J]. 中国科学技术大学学报, 2009, 39(1): 15-22.
[29]易明建, 陈月娟, 周任君, 等. 2008年中国南方雪灾与平流层极涡异常的等熵位涡分析[J]. 高原气象, 2009, 28(4): 880-888.
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