Anomalous Moisture and Temperature Characteristics in Precipitation Process During January 2008 Heavy Snowstorm in China

Chen Hongxing; Chen Yun; Lu Er; Li Hui

doi:10.11898/1001-7313.20150502

Vol.26, NO.5, 2015

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Article Navigation > Journal of Applied Meteorological Science > 2015 > 26(5): 525-535

Chen Hongxing, Chen Yun, Lu Er, et al. Anomalous moisture and temperature characteristics in precipitation process during January 2008 heavy snowstorm in China. J Appl Meteor Sci, 2015, 26(5): 525-535. DOI: 10.11898/1001-7313.20150502.

Citation:

Chen Hongxing, Chen Yun, Lu Er, et al. Anomalous moisture and temperature characteristics in precipitation process during January 2008 heavy snowstorm in China. J Appl Meteor Sci, 2015, 26(5): 525-535. DOI: 10.11898/1001-7313.20150502.

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Anomalous Moisture and Temperature Characteristics in Precipitation Process During January 2008 Heavy Snowstorm in China

DOI: 10.11898/1001-7313.20150502

Chen Hongxing^1,2,
Chen Yun^1,3,
Lu Er^{2
,
,},
Li Hui²

1.
Chengdu University of Information Technology, Chengdu 610225
2.
Nanjing University of Information Science & Technology, Nanjing 210044
3.
National Meteorological Center, Beijing 100081

Received Date: 2015-02-13
Rev Recd Date: 2015-05-04
Publish Date: 2015-09-30

Abstract

Abstract

The severe cryogenic freezing rain and snow disastrous weather occurrs in central-southern China from 10 Jan to 2 Feb in 2008, which lasts for nearly a month, causes huge social and economic impacts. The water vapor supply and the cold air surges of this disaster are investigated, and their effects on the formation of the heavy snowstorm are performed. The abnormality of the atmospheric circulation is that the blocking high remains stable in high latitudes of the Northern Hemisphere, the western Pacific subtropical high is more north than normal and the south branch trough is active. In this process, cold air continuously transports from north to central-southern China, forming a high isentropic potential vorticity center. At the same time, there is also strong water vapor continuously transports to north, the integrated water vapor is more than normal in the central-southern China, but at 850 hPa and levels below, the moisture is less. At different levels, anomalous temperature and moisture are different. From low layer to high layer, the air temperature change from abnormally low to abnormally high. The moisture increases and turns into more than normal at 700 hPa. Some methods are defined to examine whether moisture and temperature both play positive roles in this event. Results indicate that at 850 hPa and levels below, although warm and moist air transport from the south, dry and cold air transport from the north is very strong, so the abnormally low air temperature caused by the cold air surges dominates the abnormally high relative humility, and the precipitation is more than normal, resulting in less moisture is less than normal, but this negative effect is weaker than the positive effect of abnormally lower air temperature. On the contrary, at 600 hPa and levels above, although the dry cold air transport from north, the warm and wet air from south is very strong, the abnormally more water vapor dominates the heavy precipitation, the air temperature is warmer than normal, and it has a negative effect at 700 hPa, the result of the blend of the warm and moist air from the south with the dry and cold air from the north is that the air over the central-southern China is moister while colder than normal. They both have positive contributions to the heavy snowstorm. It shows from calculation that at this level, the moistness of the air contributes more than the coldness of the air.
- low temperature freezing rain and heavy snowfall;
- cold air surge;
- moisture supply

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References(32)

Figures and Tables

图 1 2008年1月10日—2月2日降水量 (a) 和降水量距平 (b) 分布

(相对于1979—2008年平均)

Fig. 1 The distribution of precipitation (a) and precipitation anomaly (b) from 10 Jan to 2 Feb in 2008

(relative to the average of the period of 1979-2008)

DownLoad: Full-Size Img PowerPoint

图 2 2008年1月10日—2月2日降水日数距平

(单位：d, 方框区域为25°~37°N，105°~121°E)

Fig. 2 The anomaly of the number of rainy days from 10 Jan to 2 Feb in 2008

(unit:d, 25°-37°N, 105°-121°E is used for regional mean)

DownLoad: Full-Size Img PowerPoint

图 3 2008年1月10日—2月2日低温日数距平 (a) 和平均温度距平 (b)

Fig. 3 The anomaly of the number of cold days (a) and the anomaly of air temperature (b) from 10 Jan to 2 Feb in 2008

DownLoad: Full-Size Img PowerPoint

图 4 2008年1月10日—2月2日500 hPa位势高度场 (阴影)(等值线为气候平均场, 单位：dagpm)

Fig. 4 500 hPa geopotential height (the shaded) and the climatic mean (the contour, unit:dagpm) from 10 Jan to 2 Feb in 2008

DownLoad: Full-Size Img PowerPoint

图 5 2008年1月10日—2月2日不同高度层等熵位涡

(单位：10^-8K·m²·s^-1·kg^-1)

Fig. 5 The entropic potential vorticity at different levels from 10 Jan to 2 Feb in 2008

(unit:10^-8K·m²·s^-1·kg^-1)

DownLoad: Full-Size Img PowerPoint

图 6 整层水汽通量输送场

(均为1月10日—2月2日，单位：kg·m^-1·s^-1) (a)2008年，(b) 气候平均，(c) 距平

Fig. 6 The column-integrated water vapor flux

(from 10 Jan to 2 Feb, unit:kg·m^-1·s^-1) (a) in 2008, (b) the climatic mean, (c) the anomaly

DownLoad: Full-Size Img PowerPoint

图 7 2008年1月10日—2月2日850 hPa的距平场 (a) 比湿，(b) 温度，(c) 相对湿度

Fig. 7 850 hPa anomalies of the specific humidity (a), temperature (b), and relative humidity (c) from 10 Jan to 2 Feb in 2008

DownLoad: Full-Size Img PowerPoint

图 8 2008年1月10日—2月2日850 hPa, 700 hPa和600 hPa平均的I_q, I_T, I_q+ I_T

Fig. 8 Distributions of the averaged I_q, I_T and I_q+I_T at 850 hPa, 700 hPa and 600 hPa from 10 Jan to 2 Feb in 2008

DownLoad: Full-Size Img PowerPoint

图 9 2008年1月10日—2月2日我国中南部地区 (25°~37°N，105°~121°E) 平均的I_q, I_T和I_q+I_T的垂直廓线

Fig. 9 Vertical profiles of I_q, I_T and I_q+I_T averaged over the disaster area (25°-37°N, 105°-121°E) from 10 Jan to 2 Feb in 2008

DownLoad: Full-Size Img PowerPoint

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