THE DIFFERENCES OF SYNOPTIC PHYSICAL CONDITION BETWEEN MCC AND MESO-β-SCALE CONVECTIVE CLOUD CLUSTER

Qin Danyu; Jiang Jixi; Fang Zongyi; Ma Lan

Vol.15, NO.5, 2004

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2004 > 15(5): 590-600

Qin Danyu, Jiang Jixi, Fang Zongyi, et al. The differences of synoptic physical condition between MCC and meso-β-scale convective cloud cluster. J Appl Meteor Sci, 2004, 15(5): 590-600.

Citation:

Qin Danyu, Jiang Jixi, Fang Zongyi, et al. The differences of synoptic physical condition between MCC and meso-β-scale convective cloud cluster. J Appl Meteor Sci, 2004, 15(5): 590-600.

Qin Danyu, Jiang Jixi, Fang Zongyi, et al. The differences of synoptic physical condition between MCC and meso-β-scale convective cloud cluster. J Appl Meteor Sci, 2004, 15(5): 590-600.

Citation:

Qin Danyu, Jiang Jixi, Fang Zongyi, et al. The differences of synoptic physical condition between MCC and meso-β-scale convective cloud cluster. J Appl Meteor Sci, 2004, 15(5): 590-600.

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THE DIFFERENCES OF SYNOPTIC PHYSICAL CONDITION BETWEEN MCC AND MESO-β-SCALE CONVECTIVE CLOUD CLUSTER

National Satellite Meteorological Center, Beijing 100081

Received Date: 2003-06-19
Rev Recd Date: 2003-09-10
Publish Date: 2004-10-31

Abstract

Abstract

The differences of synoptic physical condition between the mesoscale convective complex (MCC) on June 22—23, 2002 and the meso-β-scale convective cloud clusters (MβCCC) on July 23—24, 2002 are analyzed by using NCEP/NCAR 1°×1° reanalysis data as well as GMS infrared body temperature (TBB) data. Results demonstrate that the MCC develops in a weak baroclinic environment, a 850 hPa horizontal wind shear line with a vortex dominated in the low levels and an anticyclone in upper levels, without baroclinic wave trough accompanying in midlevels. In contrast to MCC, the MβCCCs tend to develop in the right entrance region of a mean 200 hPa jet stream. Although the low level conditions are quite similar for both MCC and MβCCC, the evolution of the MβCCC is more related to a midlevel short-wave trough (main forcing) more than MCC, which is driven by a low-level θ_se gradients. Evidence also supports that the MCC needs abundant higher energy supply than the MβCCCs with larger and deeper θ_se tongue and a broader convective instability area.
- Mesoscale convective complex (MCC);
- Convective clusters;
- MCS

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References(14)

Figures and Tables

图 1 2002年6月23曰00:00UTC (B) 和7月24日00:00UTC (b) 的24 h降雨量

(等值线标值丹别为l0, 25, 50, 100和150 mm)

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图 2 2002年6月22日16:00 UTC (a) 和7月23日O8:00 UTC (b) 的TBB图

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图 3 2002年6月22日12:00 UTC的200 hPa (B)、500 hPa (b)、850lap8(c) 和2002年7月24日00:00 UTC的200 hPa (d)、500 hPa (e)、850 hPa（f）天气形势

(图中TBB≤-32℃、-52℃、-62℃区域分别用不同阴影表示，粗虚钱是切变线.粗实线是糟线)

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图 4 2002年6月22日00：00 UTC (a) 和7月23日O0：00 UTC (b)850 hPa风场和θ_se场

(图中θ_se等值线间隔4 K，箭头为风矢量)

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图 5 2002年6月22日00：00 UTC (a) 和7月23日00：O0 UTC (b)850 hPa流场及低空急流

(虚线为≥8 m·s^-1等风速线，间隔2 m·s^-1，粗箭头为急流轴)

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图 6 2002年6月19~23日 (a) 和7月20~24日 (b)850 hPa沿114°E的水汽通量散度随时间变化

(等值线间隔1×10^-4g·s^-1·hPa^-1·cm^-1，花短直线为对流云团所在的位置，下同)

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图 7 2002年6月22日12：00 UTC沿114。E (a) 和7月23日12：00 UTC沿116°E (b) 的径向环流和θ_se垂直剖面

(细实线是θ_se等值线，间隔为5 K，粗虚线为上升和下沉气流分界线)

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图 8 6月22日12：00 UTC沿114。E (a) 和7月23日12：00 uTC (b) 沿116°E涡度垂直剖面

(实线为正，虚线为负，单位：10^-5s^-1)

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图 9 MCC (a) 和一般暴雨云团 (b) 发生发展的环境条件

(花弧线表示MCC或对流云区，深阴影区为中-β对流云团，浅阴影区为850 hPa θ_se≥34O K和θ_se500-θ_se850＜0的高能量不稳定区，粗实线箭头、粗虚线和点虚线分别为850 hPa急流轴、切变线和低涡，细箭头为500 hPa或200 hPa流线，粗实线为槽线，粗虚线箭头为高空急流轴)

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表 1a MCC个例

1b 一般暴雨云团个例

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