摘要
利用2007年以来西安郊区泾河观象台大气细颗粒物质量浓度资料和气象自动站资料以及探空资料,采用国标法、罗氏法和位温法三种不同方法计算边界层高度。结果表明,三种方法得到的结果有一定差异,但日变化分布一致,可以用于分析边界层高度变化特征。边界层高度季节变化明显,春、夏、秋和冬季边界层高度分别是1300,1200,820和800 m。边界层日变化与颗粒物浓度呈显著负相关关系,即冬季边界层顶高度低,三种粒径颗粒物质量浓度高,夏季则相反。PM2.5、PM1.0、PM1.0分别在PM10、PM2.5、PM10含量中有明显月变化,表明西安除了本地污染源之外,春季易受上游风沙天气影响。
Using sounding data,surface meteorological data and particle size concentration,the planetary boundary layer height( PBLH) was calculated and its change characteristic with particle size concentration were compared. Diurnal and seasonal PBLH variation characteristics are based on Nozaki method which is evaluated by Liu method,daily maximum and minimum PBLH are determined by Holzworth method. Results show that:Nozaki method is valuable for the diurnal and seasonal variation of PBLH though substantially overestimate stable boundary layer which can be compensate by Holzworth method. Daily maximum PBLH occurs during 11: 00( Beijing Time,hereafter the same) to 16:00,and seasonal maximum PBLH is during spring attributing to annual maximum wind speed. PM2. 5,PM1. 0and PM10 mass concentrations are negatively correlated with PBLH for interannual,annual,and seasonal time scale. Content of PM2. 5in PM10,PM1. 0in PM2. 5and PM1. 0in PM10 show notable monthly variations indicating Xi' an city also affects by upwind windy and dusty weather besides local pollution sources.
出处
《高原气象》
CSCD
北大核心
2014年第5期1383-1392,共10页
Plateau Meteorology
基金
国家自然科学基金项目(41375155)
中国气象局气候变化专项(CCSF201327)
973计划项目(2013CB955800)
关键词
边界层高度
大气层结
粒子浓度
特征分析
PBLH
Atmospheric stratification
Particle size concentration
Characteristic analysis
