Structures of Meiyu Fronts in 1998

Zhang Xiaoling; Tao Shiyan; Zhang Qingyun

Vol.13, NO.3, 2002

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Zhang Xiaoling, Tao Shiyan, Zhang Qingyun. Structures of Meiyu fronts in 1998. J Appl Meteor Sci, 2002, 13(3): 257-268.

Citation:

Zhang Xiaoling, Tao Shiyan, Zhang Qingyun. Structures of Meiyu fronts in 1998. J Appl Meteor Sci, 2002, 13(3): 257-268.

Zhang Xiaoling, Tao Shiyan, Zhang Qingyun. Structures of Meiyu fronts in 1998. J Appl Meteor Sci, 2002, 13(3): 257-268.

Citation:

Zhang Xiaoling, Tao Shiyan, Zhang Qingyun. Structures of Meiyu fronts in 1998. J Appl Meteor Sci, 2002, 13(3): 257-268.

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Structures of Meiyu Fronts in 1998

Institute of Atmospheric Physics , Chinese Academy of Sciences , Beijing 100029

Received Date: 2001-07-27
Rev Recd Date: 2001-09-14
Publish Date: 2002-06-30

Abstract

Abstract

A diagnostic study of the dynamic and thermodynamic structures of Meiyu fronts in 1—10 June, 12—28 June, and 20—30 July 1998 is presented. It is found that fronts affecting precipitation over South China in early summer have the same dynamic and thermodynamic structures as Meiyu fronts over the Yangtze River Basin. They have the same structural characteristics as tropical synoptic systems. The vertical dynamic and thermodynamic structure of Meiyu fronts has quasi-tropical characteristics, the transition between ITCZ and the extra-tropical front.
- Meiyu front;
- Dynamic and thermodynamic structure;
- Quasi-tropical system

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References(7)

Figures and Tables

图 1 1998年5～8月10天平均的季风涌和西太平洋副热带高压的活动 (矢量表示整层积分的qV(m·s^-1 ·hPa);实线是500 hPa等5880(gpm)高度线；阴影区为TBB大于-10℃ )

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图 2 时间平均的θ_e(K)(实线)和比湿q(g·kg^-1)(虚线)沿115)的垂直剖面(a、b、c)以及时间平均的纬向风U(m·s^-1)沿115)的垂直剖面(d、e、f) (a、d): 6月1～10日华南前汛期，（b、e)6月12～28日第一次梅雨期，(cf)：月20〜30日二度梅时期）

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图 3 时间平均的垂直速度ω(hPa·s ^-1 (a、b、c)和相对涡度ζ(×10^-5S^-2)(d、e、f)沿115°E的垂直剖面(其它说明同图 2)

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图 4 850 hPa水平风uv(a、b、c)和TBB(d、e、f)的标准差分布(其它说明同图 2)

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图 5 时间平均的850 hPa 水汽输送qV(m·s^-1)和水汽通量散度▽ •qV(×10^-5s^-2)分布

（a、b、c时间与图 2一致；d为▽ •qV的区域平均的垂直剖面）（图d中，曲线A表示6月1~10日，20°~25° N，110°~120°E范围内的时间区域平均；曲线B表示6月1228日，25°~30°N，110°~120°E范围内的时间区域平均；曲线C表示7月2030日，28°~32°N，110°~120°E范围内的时间区域平均）

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图 6 时间平均的视热源（Q₁)和视水汽汇（-Q₂)以及Q₁-Q₂ 的垂直分布

(6月1~10日为20°～25°N，110°~120°E的区域平均；6月12~28日为25°~30°N，110°~120°E的区域平均；7月20~30日为27°~32°N，110°~120°E的区域平均)

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图 7 时间平均的水平锋生(a、b、c)和垂直锋生(d、e、f)

（其它说明同图 2；阴影区表示锋生函数F≥1×10^-9K·m^-1·s^-1）

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References

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[3]	Ninomiya. Large-and meso-α-scale characteristics of Meiyu/Baiu Front associated with intense rainfalls in 1-10 July 1991. J. Meteor. Soc. Janpan, 2000, 78: 141～157.
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