A CASE STUDY OF THE STRUCTURE OF THE HETAO HIGH WHICH CAUSED LONG-LASTING HOT WEATHER IN BEIJING

Qian Ting ting; Wang Yingchun; Zheng Zhifang; Zheng Yongguang

Vol.16, NO.2, 2005

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2005 > 16(2): 167-173

Qian Ting ting, Wang Yingchun, Zheng Zhifang, et al. A case study of the structure of the Hetao high which caused long-lasting hot weather in Beijing. J Appl Meteor Sci, 2005, 16(2): 167-173.

Citation:

Qian Ting ting, Wang Yingchun, Zheng Zhifang, et al. A case study of the structure of the Hetao high which caused long-lasting hot weather in Beijing. J Appl Meteor Sci, 2005, 16(2): 167-173.

Qian Ting ting, Wang Yingchun, Zheng Zhifang, et al. A case study of the structure of the Hetao high which caused long-lasting hot weather in Beijing. J Appl Meteor Sci, 2005, 16(2): 167-173.

Citation:

Qian Ting ting, Wang Yingchun, Zheng Zhifang, et al. A case study of the structure of the Hetao high which caused long-lasting hot weather in Beijing. J Appl Meteor Sci, 2005, 16(2): 167-173.

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A CASE STUDY OF THE STRUCTURE OF THE HETAO HIGH WHICH CAUSED LONG-LASTING HOT WEATHER IN BEIJING

1.
Department of Atmospheric Science, School of Physics, Peking University, Beijing 100871
2.
Institute of Urban Meteorology, CMA, Beijing 100089

Received Date: 2003-10-08
Rev Recd Date: 2004-03-03
Publish Date: 2005-04-30

Abstract

Abstract

Based on the severe hot weather case taken place on July 11—14, 2000 in Beijing, we analyzed the horizontal and vertical structure of the Hetao High on 700 hPa associated with the hot weather. The result shows that the High is a deep negative vorticity system and related with a large-scale, eastward moving warm air mass in western arid region. The Hetao High is a relatively small and locomotive system, so hot weather usually sustains only several days. As a warm high, the Hetao High reached the high level of troposphere in vertical direction. Located between the exit region of Polar-front jet and the entrance region of subtropical jet, the upper level convergence makes Hetao High under the control of downward current. Adiabatic warming because of sinking and radiation heating are in favor of hot weather. At last, the paper pointed out that the formation of the Hetao High might be associated with dynamically pressure increase.
- Hot weather;
- High;
- Structure;
- Diagnose

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References(11)

Figures and Tables

图 1 2000年7月14日14 :00地面高温区和热低压及其11~14日的动态

(实线为等压线, 其中加粗的是995和990 h Pa的等压线, 粗虚线为高于30 ℃的等温线, 高温中心和低压中心的路径分别用粗虚线箭头和粗实线箭头表示)

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图 2 2000年7月12日08 :00的高空环流形势图 (a)700 hPa等压面图

(虚线为等温线, 单位:℃; 实线为等高线, 单位:gpm; 阴影区为涡度≤-2 ×10 ^-5s ^-1的负涡度区, 双箭头表示河套高压的水平尺度), (b)300 hPa等压面图 (粗虚线为等温线, 单位:℃; 实线为等高线, 单位:gpm; 细虚线为等涡度线, 单位:10 ^-5s ^-1, 阴影区为≤-6 ×10 ^-5s^-1的负涡度区, 长划线为暖脊)。

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图 3 沿42°N的纬向垂直剖面 (a)7月11日08:00和 (b)14日08 :00

(实线为等温线, 单位:℃; 虚线为等涡度线, 单位:10^-5s ^-1; 正号和负号分别代表正负涡度, 阴影区和箭头表示下沉运动)

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图 4 7月12日08:00 200 hPa风场和等风速线 (a) 和沿110°E的经向垂直剖面图 (b)

(图 (a) 中粗实线为等风速线, 从20 m/ s开始, 间隔4 m/ s; 粗矢线为高空急流的轴线; 细虚线为等散度线, 间隔5 ×10 ^-6s ^-1, 阴影区为主要的辐合区。图 (b) 中粗实线为等风速线, 间隔10 m/ s; 细实线为等温线, 间隔5 ℃; 虚线和点线为散度等值线, 单位为10 ^-6s ^-1。图中CON和DIV分别代表辐合和辐散, J_mid和J_sub分别代表中纬度极锋急流中心和副热带急流中心)

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图 5 河套高压和北京持续高温天气的高低空环流系统配置综合图

(图中粗断线表示地面高温区和热低压, 细实线为700 hPa等压面的高度场和河套高压, 实粗矢线和断粗矢线分别为200 hPa高空副热带急流和极峰急流, J为急流中心位置, 两个短箭头表示这两条急流之间非地转风所引起的高空辐合, 粗实线为300 hPa高压脊的特征等高线)

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表 1 1951~2000年6、7、8月每10年月平均高温日数和极端最高气温

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