| 亚洲阻塞高压分类及其与东北冷涡活动和东北夏季低温的联系 |
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| 引用本文： | 刘刚,沈柏竹,廉毅,李尚锋,曹玲,刘平.亚洲阻塞高压分类及其与东北冷涡活动和东北夏季低温的联系[J].地理科学,2012(10):1269-1274. |
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| 作者姓名： | 刘刚 沈柏竹 廉毅 李尚锋 曹玲 刘平 |
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| 作者单位： | 中高纬度环流系统与东亚季风研究开放实验室;吉林省气象服务中心;吉林省气象科学研究所;兰州大学 |
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| 基金项目： | 公益性行业(气象)科研专项(GYHY:201006020,201106016,201106015);国家自然科学基金面上项目(41175083);青年基金项目(40705036)资助 |
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| 摘 要： | 利用1948~2009年美国环境预报中心(NCEP)500 hPa高度场逐日再分析资料,按照通用的阻塞高压天气学定义,采用机器自动识别方法,检索和分析近62 a亚洲夏季阻高活动时空变化特征,结果表明:共统计到1 337个阻塞高压个例,以生命期3~7 d的过程居多,占80.1%,阻高活动累计个数和累计天数集中区可分为偏东类(鄂霍次克海)、偏西类(乌拉尔山)、中间类(贝加尔湖)和其他类4类,其中中间类阻塞高压活动累计个数最多,占总个数的30.4%,偏东类次之,占27.5%,其他类占23.8%,偏西类最弱,占18.3%;20世纪90年代以来,乌拉尔山地区阻高处于明显偏弱期,鄂霍次克海阻高处于偏强期;但是,21世纪初叶,乌拉尔山地区阻高活动开始呈上升趋势,而鄂霍次克海阻高却呈明显下降趋势,值得关注;夏季阻塞高压与东北冷涡活动天数呈显著同期正相关,与长春、哈尔滨同期平均气温呈显著负相关;亚洲夏季阻塞高压是影响东北夏季低温重要的环流系统;鄂霍次克海阻高6月活动异常年,850hPa风距平场在120°E~140°E,40°N~55oN存在很强的偏东气流,有利于来自鄂霍次克海偏东北路径的冷空气入侵东北亚及中国东北地区。
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| 关 键 词： | 亚洲阻塞高压 客观识别分类 时空分布特征 东北冷涡 东北夏季低温 |
The Sorts of 500 hPa Blocking High in Asia and It’s Relations to Cold Vortex and Aestival Low Temperature in Northeast of China |
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| LIU Gang,SHEN Bai-zhu,LIAN Yi,LI Shang-feng,CAO Ling,LIU Ping.The Sorts of 500 hPa Blocking High in Asia and It’s Relations to Cold Vortex and Aestival Low Temperature in Northeast of China[J].Scientia Geographica Sinica,2012(10):1269-1274. |
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| Authors: | LIU Gang SHEN Bai-zhu LIAN Yi LI Shang-feng CAO Ling LIU Ping |
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| Institution: | 1.Laboratory of Research for Middle-High Latitude Circulation System and East Asian Mons-oon,Changchun,Jilin 130062,China;2.Jilin Province Meteorological Service Center Changchun,Jilin 130062,China;3.Institute of Meteorological Science of Jilin Province,Changchun,Jilin 130062,China;4.Lanzhou University,Lanzhou,Gansu,730000,China) |
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| Abstract: | Based on the daily NECP /NCAR reanalysis data of 500 hPa height field from 1948 to 2009,an objective classification and widely-agreed method was applied to analyze the temporal and spatial distributions of atmospheric blockings high in Asia during summer,In addition,the location and numbers of blockings high was automatically determined.The results show that there are 1 337 blocking events during the last 62 summers.According to the active period of blocking events,a period of 3-7 days are dominant during all the events which account for 80.1%.Based on the accumulative numbers and days,the blockings are divided into eastward type(blocking high over the Okhotsk Sea),westward type(blocking high over Ural Mountain),central type(blocking high over Baikal Lake) and the others,totally four types,occupying at 27.5%,30.4%,18.3%,and 23.8 %,respectively.Since 1990s,blocking events in Ural region are in a weak period,otherwise in Okhotsk region are in a strong period,but blocking events in Ural region begin taking upward trend at the beginning of 21st century.Bblockings in Okhotsk region take a clear downward trend.There is a significant positive relationship between blocking events and cold vortex in Northeast China,but a negative correlation between blocking events and temperature of Changchun and Harbin in summer.Blocking high is one of important circulation system which causes the low temperature in Northeast of China in summer.During westward type blocking events strongly active years in June,a strong easterlies air flow in 850 hPa is found over the region of 20°E-140°E,40°N-55°N,It is advantageous for cold air come from the northeast path in Okhotsk region to invade Northeast Asia and the northeast area in China. |
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| Keywords: | blocking high in Asia objective classification methods spatial-temporal distribution cold vortex in Northeast China low temperature in Notheast of China in summer |
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