南京冬季雾多发期边界层结构观测分析
投稿时间: 2010-06-12    点此下载全文
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作者单位
陆春松1,牛生杰1,岳平2,3,4,岳治国5,项磊1  
基金项目:1.南京信息工程大学 中国气象局大气物理与大气环境重点开放实验室,江苏 南京 210044;2.中国气象局 兰州干旱气象研究所,甘肃 兰州 730020;3.甘肃省干旱气候变化与减灾重点实验室,甘肃 兰州 730020;4.中国气象局 干旱气候变化与减灾重点开放实验室 甘肃 兰州 730020;5.陕西省人工影响天气中心,陕西 西安,710014
中文摘要:2006年冬季在南京北郊盘城利用系留气球探测系统、自动气象站等仪器对雾日和非雾日的边界层进行了监测,对比分析了两者的边界层结构。结果表明,非雾日主要为单层贴地逆温,并时常出现短时的双层结构,雾发展成熟时逆温则脱离地面。与非雾日相比,雾日平均雾顶之上温度日较差增大,雾顶之下则减小。平均风速的时间—高度分布在雾日和非雾日类似,在稳定性边界层中风速随高度出现一个或者两个极大值区。温度和比湿在非雾日没有显著的对应性,而在雾体内具有较好的对应关系,在雾顶升降过程中反相关。较强的逆温、较低的温度和较小的近地层风速是南京冬季成雾的背景条件。
中文关键词:  多发期  边界层  冬季  南京
 
Observational research on boundary layer structure during high incidence period of winter fog in Nanjing
Abstract:An observation was carried out in the winter in 2006 at Pancheng,northern suburb of Nanjing,using tethered balloon system,automatic weather station and other instruments.The boundary layer structures on fog and fog free days are analyzed and compared.Results show that on the fog free days the temperature inversions are mainly single layer ones,sometimes with short duration double layer structures,while the fog mature stage inversions are free from the ground.Compared with the fog free days,the temperature diurnal range above the average fog top on fog days is larger while the below one is smaller.The time height cross section of average wind speed on the fog days is similar to that on the fog free days.In the stable boundary layer,the wind speed profiles have one or two maximum values.The average wind speed profiles on fog days are similar to those on the fog free days.No remarkable relationship exists between the temperature and specific humidity profiles on the fog free days.Differently,these two parameters have a good correspondence between each other in the fog body whereas they vary oppositely during the ascent and descent of the fog top.The stronger temperature inversion,lower temperature and smaller near surface layer wind speed are background for the winter fog formation in Nanjing.
keywords:fog  high incidence period  boundary layer  winter  Nanjing
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