西南地区不同类型风场与对流层臭氧分布变化的关系  

The Correlation between the Tropospheric Wind Fields and Ozone Distributions over Southwest China

作　　者：易香妤 郭世昌[1] 刘二影 田孟坤 窦艳[1] 

机构地区：[1]云南大学大气科学系,昆明650091

出　　处：《三峡生态环境监测》2017年第4期25-33,共9页Ecology and Environmental Monitoring of Three Gorges

基　　金：国家自然科学基金(41275072)

摘　　要：本文利用欧洲中期天气预报中心(ECMWF)1996-2015年间月平均风场、臭氧质量混合比分层资料,通过分类合成方法将中国西南地区夏、冬半年的风场分成三种不同类型,并研究了不同类型风场与对流层臭氧分布变化的关系。研究表明:(1)1996-2015年,我国西南地区700 hPa夏半年风场可分为S1西南风型与S2东南风型,冬半年主要为W强西风型;(2)从700 hPa臭氧质量混合比的分布来看,三种风型均在青藏高原东南侧的四川省西部出现臭氧低值区,S1型和S2型大致都是围绕该低值中心自西北向东南方向增加,但由于东南风的平流作用,S2型更偏向于经向分布,而W型则几乎是呈北低南高的纬向分布;(3)500 hPa上S1型和S2型同样能在四川省西部发现臭氧质量混合比低值区,而W型低值区却消失,呈现出十分平直的南高北低的纬向分布;(4)300 hPa臭氧质量混合比普遍高于中低层,三种风型的臭氧质量混合比几乎都是呈纬向分布,但分布情况变成了北高南低型;此外还发现,中低层冬半年的风型的臭氧混合比都低于夏半年。(5)本文为了更真实探究气块的运动路径,选取三种不同代表月份,运用HYSPLIT后向轨迹模式观察了重庆、昆明、贵阳三地上空700 hPa的气块运动路径并对其进行分析。In this paper, the European Center for Medium-Range Weather Forecasts （ ECMWF） stratified data of monthly mean wind and ozone mass mixing ratio （ MMR） from 1996-2015 were used to characterize the tropospheric wind and ozone fields in summer and winter over southwest China. Three different wind types were obtained by classification synthesis method, and the correlation between the wind types and ozone distributions was also analyzed. The results showed that： （1） The wind fields during 1996 and 2015 at 700 hPa isobaric surface could be divided into southwest （ S1） and southeast （ S2） types in the summer, and mainly strong west type （W） in the winter. （2） The ozone MMR distributions at 700 hPa were generally around a low-value center in the southeast Qinghai-Tibet Plateau （i. e. the western Sichuan Province） for all three wind types, and increased from the northwest to the southeast for both S1 and S2 types with an apparent east high-west low tendency for S2 type due to advection of the southeasterlies while exhibited a north low-south high pattern for W type. （3） At 500 hPa, the low ozone MMR area in the western Sichuan Province was also found to exist for S1 and S2 types, but disappeared for W type, suggesting a stronger degree of east high-west low zonal distribution at 500 hPa than at 700 hPa. （4） At300 hPa, the ozone MMR values were generally higher than those at 500 hPa and 700 hPa, and displayed almost purely zonal distribution with a north high-south low pattern for all three wind types. Also, the ozone MMR values at 700 hPa and 500 hPa were always lower for winter W wind type than for both summer oness. （ 6） In order to explore the movement path of air block more truly, three representative of different winds were also selected. the movement of the air block at 700 hPa over Chongqing, Kunming and Guiyang was observed and analysized by HYSPLIT back trajectories model.

关 键 词：中国西南地区 对流层臭氧 臭氧质量混合比 HYSPLIT后向轨迹模型 

分 类 号：X515[环境科学与工程—环境工程]