地理科学

地理科学 ›› 2015, Vol. 35 ›› Issue (2): 251-258.doi: 10.13249/j.cnki.sgs.2015.02.251

• 论文 • 上一篇    

东北区夏季低温事件概率空间分布与亚洲阻塞流型域及其冷空气活动路径

苏丽欣1,2, 廉毅1,2, 李尚锋1,2, 沈柏竹1,2, 陈长胜1,3   

  1. 1. 中高纬度环流系统与东亚季风研究开放实验室, 吉林长春130062;
    2. 吉林省气象科学研究所, 吉林长春130062;
    3. 吉林省气象台, 吉林长春130062
  • 收稿日期:2014-01-05 修回日期:2014-05-08 出版日期:2015-02-20 发布日期:2015-02-20
  • 作者简介:苏丽欣(1980-),女,黑龙江齐齐哈尔人,工程师,主要研究方向天气气候研究,E-mail:sulixin_329@163.com
  • 基金资助:

    国家自然科学基金项目(41175083,41275096,41405094)和公益性行业科研专项(GYHY201106016,GYHY201006020,GYHY201106015)资助.

Distribution of Summer Cool Events over Northeast China and the Asian Blocking Regime and Cold Air Path

SU Li-xin1,2, LIAN Yi1,2, LI Shang-feng1,2, SHEN Bai-zhu1,2, CHEN Chang-sheng1,3   

  1. 1. Laboratory of Research for Middle-High Latitude Circulation System and East Asian Monsoon, Changchun, Jilin 130062, China;
    2. Jilin Meteorological Science Institute, Changchun, Jilin 130062, China;
    3. Jilin Meteorological Observatory, Changchun, Jilin 130062, China
  • Received:2014-01-05 Revised:2014-05-08 Online:2015-02-20 Published:2015-02-20

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摘要：

采用国家气候中心的全国160个和东北88个测站1960~2010年的逐月观测资料、美国NCEP/NCAR的再分析资料,对东北区夏季低温事件概率的空间分布与冷空气活动路径及其环流特征进行了分析,结果表明:东北区测站严重冷夏A事件≥20%概率区主要分布在黑龙江省的大部和吉林省的中东部,概率大值轴呈东北-西南向分布;东北区测站冷夏B事件≥20%概率区主要分布在东北区的中西部和长白山东部区,概率大值轴呈西北-东南向分布;5 个A事件典型年的500 hPa 亚洲地区呈现乌拉尔山与鄂霍次克海阻高,与东北区均为负距平区构成双阻塞偶极子流型,偏东和偏北区域为温度场负距平极值中心;5 个B事件典型年则巴尔喀什湖和贝加尔湖为正异常区,东北亚至北太平洋阿留申群岛附近上空为负距平区,构成亚洲地区东西向偶极子阻塞流型,温度场负距平分布为偏西北-东南走向;选择850 hPa 的假相当位温θse 的316 K候平均等值线的变化,反映来源于极地或超极地的冷空气活动路径的时空范围,其A和B事件典型年冷空气活动路径均分别与与东北区A、B事件大概率区的主要轴向分布是吻合的.

关键词: 东北区, 夏季低温, 路径, 假相当位温, 冷空气

Abstract:

Using National Climate Center monthly observations data at 160 stations in the national and 88 stations in Northeast China from 1960 to 2010 and the NCEP/NCAR monthly reanalysis data, the spatial distribution of summer cool events over Northeast China and Asian blocking regime and cold air path have been analyzed. The results show that more than 20% probability of the serious cold summer ("A" events) in Northeast China stations are mainly distributed in most area of Heilongjiang province and the Middle East northeast area of Jilin Province. The probability value axis is in a northeast southwest direction. More than 20% probability of cold summer ("B" events) in Northeast China stations are mainly distributed in the northeast area of the Midwest and Eastern Changbai Mountain region. The probability value axis is in Northwest - southeast distribution. At 500 hpa, the five of "A" events typical years show Ural mountain and the Okhotsk blocking High, and northeast regions are all negative anomaly zone consisting of double block dipole pattern, with negative anomaly center of maximal temperature field over eastern and northern area. The five of "B" events typical years show that Lake Baikal and Lake Balkhash are positive anomaly area, while the negative anomaly zone extends from the Northeast Asia to the Aleutian islands. It constitutes East-West dipole blocking flow pattern, with negative anomaly of temperature field distribution is in Northwest-Southeast direction. The 850 hPa,316 K pentad mean contours are selected to scope the activities of the cold air from the polar route reflection or super polar. The cold air path of "A" and "B" events typical years is consistent with the probability of the axial distribution of "A" and "B" event in Northeast China respectively.

Key words: Northeast China, cold air, path, summer cool, potential pseudo-equivalent temperature

中图分类号: 

  • P49