Analysis of Aerosol Extinction Coefficient Under Different Weather Condition Based on MPL Monitoring Data in the Semi － arid Region in Northwest China

doi:10． 11755/j． issn． 1006 －7639(2013) －04 －0672

Journal of Arid Meteorology

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Analysis of Aerosol Extinction Coefficient Under Different Weather Condition Based on MPL Monitoring Data in the Semi － arid Region in Northwest China

SONG Jiayao^1，2，ZHANG Wenyu²，ZHANG Yu²，TIAN Meng²

1． Weather Modification Office of Shaanxi Province，Xi’an 710014，China;
2． Key Laboratory for Semi － Arid Climate Change of the Ministry of Education，College of Atmospheric Sciences，Lanzhou University，Lanzhou 730000，China

Online:2013-12-14 Published:2013-12-14

基于微脉冲激光雷达观测资料的半干旱区沙尘天气消光效应分析

宋嘉尧^1，2，张文煜²，张宇²，田梦²

1．陕西省人工影响天气办公室，陕西西安 710014;
2．半干旱气候变化教育部重点实验室，兰州大学大气科学学院，甘肃兰州 730000

作者简介:宋嘉尧(1984 － )，女，汉族，硕士，工程师，主要从事气溶胶及人工影响天气研究． E － mail:song． song_1123@ hotmail． com
基金资助:
国家重大科学研究计划“973”项目(2012CB956200)资助

Abstract

Abstract:

Based on the daily observational data of the micro pulse laser radar (MPL) from April 30 to May 2 in the Semi － Arid Cli-
mate and Environment Observatory of Lanzhou University(SACOL)，the returned signals were measured and the aerosol extinction coef-
ficient was calculated to analyze the variation of vertical distribution of aerosol extinction coefficient under different weather conditions．
The results show when sky was clear，the aerosol accumulation area appeared in the range of 0 －2 km from 09:00 to 15:00 due to the
influence of human activity，and the mean value of aerosol extinction coefficient was less than 0． 20 km－1． Under the floating dust
weather condition，the aerosol concentrated in lower level ranged from 1 to 2 km and higher level ranged from 5 to 7 km，which influ-
enced by sand transport，and the mean value of aerosol extinction coefficient was 0． 38 km－1． Under the blowing sand weather condi-
tion，the aerosol concentrated in the level of 0 －1 km，and the aerosol concentration was so much higher than that under the floating
dust weather condition，and in higher level，the aerosol distributed less and evenly，the mean value of aerosol extinction coefficient was
more than 0． 50 km－1．

Key words: micro pulse laser radar(MPL), atmospheric aerosols, dust weather, vertical distribution

摘要：

利用兰州大学半干旱区气候与环境观测站(SOCAL)的微脉冲激光雷达(MPL)2008 年4 月30日至 5 月 2 日观测资料，对晴朗天气、浮沉天气及扬沙天气过程中气溶胶垂直分布的连续变化、物理机制进行了对比分析与探讨。结果表明 MPL 很好地反映出不同天气过程中大气气溶胶廓线的日变化特征:受人类活动影响，天气晴朗时，早晨 9 时开始在 0 ～ 2 km 范围出现气溶胶聚集区，持续至 15时，气溶胶平均消光系数＜0． 20 km－1;受沙尘输送影响，浮尘天气时，气溶胶聚集区高度范围为 1 ～2km，高层气溶胶富集区高度范围为 5 ～7 km，气溶胶平均消光系数 0． 38 km－1;扬沙天气时，气溶胶聚集区高度范围为 0 ～1 km，浓度远大于浮尘天气，但高层气溶胶浓度较小且分布较均匀，气溶胶平均消光系数＞0． 50 km－1。

关键词: MPL, 气溶胶, 沙尘天气, 垂直分布

CLC Number:

P412． 25

SONG Jiayao，ZHANG Wenyu，ZHANG Yu，TIAN Meng. Analysis of Aerosol Extinction Coefficient Under Different Weather Condition Based on MPL Monitoring Data in the Semi － arid Region in Northwest China[J]. Journal of Arid Meteorology, DOI: 10． 11755/j． issn． 1006 －7639(2013) －04 －0672.

宋嘉尧，张文煜，张宇，田梦. 基于微脉冲激光雷达观测资料的半干旱区沙尘天气消光效应分析[J]. 干旱气象, DOI: 10． 11755/j． issn． 1006 －7639(2013) －04 －0672.

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Analysis of Aerosol Extinction Coefficient Under Different Weather Condition Based on MPL Monitoring Data in the Semi － arid Region in Northwest China

基于微脉冲激光雷达观测资料的半干旱区沙尘天气消光效应分析

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