Characteristics of Heavy Fog in Dalian

Liang Jun; Zhang Shengjun; Sui Hongqi; Zou Yaoren

Vol.20, NO.1, 2009

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2009 > 20(1): 28-35

Liang Jun, Zhang Shengjun, Sui Hongqi, et al. Characteristics of heavy fog in Dalian. J Appl Meteor Sci, 2009, 20(1): 28-35.

Citation:

Liang Jun, Zhang Shengjun, Sui Hongqi, et al. Characteristics of heavy fog in Dalian. J Appl Meteor Sci, 2009, 20(1): 28-35.

Liang Jun, Zhang Shengjun, Sui Hongqi, et al. Characteristics of heavy fog in Dalian. J Appl Meteor Sci, 2009, 20(1): 28-35.

Citation:

Liang Jun, Zhang Shengjun, Sui Hongqi, et al. Characteristics of heavy fog in Dalian. J Appl Meteor Sci, 2009, 20(1): 28-35.

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Characteristics of Heavy Fog in Dalian

1.
Dalian Meteorological Observatory, Dalian 116001
2.
State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081

Received Date: 2008-06-10
Rev Recd Date: 2008-11-24
Publish Date: 2009-02-28

Abstract

Abstract

Two heavy-fog processes occurred in February and April, 2007 of Dalian and its coastal area are analyzed using the sounding data from GTS1 digital radiosonde, conventional observation data, and NCEP/NCAR global 1°×1°reanalysis data. The diagnostic analysis of environment and its dynamic and thermodynamic effects on the heavy fog indicates that high-level zonal warm and dry airflow at high latitude and southwest warm and moist airflow in mid-lower troposphere supply water vapor and wind for the formation of fog. The existence of air steady layer at lower-layer and the superposition between fog layer and the warm, dry air are of benefit to the maintenance of heavy fog.Furthermore, sea surface temperature on Yellow Sea and Bohai Sea induces the further warming and transformation of surface cold high in winter, which is favorable to the formation and development of radiation fog. As a result, the warm air-mass cools and condenses in spring, which causes maintenance of the advection cooling fog. And the north wind followed by the southeast moving of cold convection is the dynamic factor to dissipate the persistent heavy fog.
- Dalian;
- heavy fog;
- inversion layer

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References(18)

Figures and Tables

图 1 2007年2月20-22日大连、长海(a) 和4月11-12日大连(b) 能见度演变

Fig. 1 Evolution of visibility from Feb 20 to 22(a) and from Apr 11 to 12(b) in 2007

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图 2 2007年2月20日08:00(a) 和4月11日08:00(b)850hPa温度场(单位:℃) 和1000hPa风矢量场(单位:m/s)

Fig. 2 Temperature at 850hPa (unit:℃) and wind field at 1000hPa (unit:m/s) at 08:00 on Feb 20, 2007(a) and 08:00 on Apr 11, 2007(b)

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图 3 小长山4月旬平均气温与平均海表温度的差值

Fig. 3 The difference of ten-day average temperature and sea-surface temperature in Apr of Xiaochangshan

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图 4 2007年2月19日08:00-23日08:00大雾期间大连的风场(a)、相对湿度(单位:%) (b)、大雾区域平均温度平流(单位:10^-5K·s^-1) (c) 和垂直速度(单位:10^-1Pa·s^-1)(d) 时间剖面图

Fig. 4 The wind (a) and relative humidity (unit:%) (b) from sounding of Dalian, the time cross-section of mean temperature advection (unit:10^-5K·s^-1)(c) and vertical velocity (unit:10^-1Pa·s^-1)(d) from 08:00 19 Feb to 08:00 23 Feb 2007 in fog region

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图 5 2007年4月10日08:00-14日08:00大雾期间大连的风场(a)、相对湿度(单位:%)(b)、大雾区域平均温度平流(单位:10^-5K·s^-1)(c) 和垂直速度(单位:10^-1Pa·s^-1)(d) 时间剖面图

Fig. 5 The wind (a) and relative humidity (unit:%)(b) from sounding of Dalian, the time cross-ssection of mean temperature advection (unit:10^-5K·s^-1)(c) and vertical velocity (unit:10^-1Pa·s^-1)(d) from 08:00 10 Apr to 08:00 14 Apr 2007 in fog region

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图 6 2007年2月21日08:00大连温度(a) 和相对湿度(b) 廓线

Fig. 6 The temperature (a) and relative humidity (b) from sounding of Dalian at 08:00 21 Feb 2007

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图 7 2007年4月11日08:00大连温度(a) 和相对湿度(b) 廓线

Fig. 7 The temperature (a) and relative humidity (b) from sounding of Dalian at 08:00 11 Apr 2007

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