南京冬季雾多发期边界层结构观测分析
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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


Observational research on boundary layer structure during high incidence period of winter fog in Nanjing
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1.Key Laboratory of Atmospheric Physics & Environment,China Meteorological Administration,NUIST,Nanjing 210044,China;2.Key Laboratory of Arid Climatic Changing and Reducing Disaster of Gansu Province,China Meteorological Administration,Lanzhou 730020,China;3.Opening Key Laboratory of Arid Climatic Changing and Reducing Disaster, Lanzhou 730020, China;4.Lanzhou Institute of Arid Meteorology,China Meteorological Administration,Lanzhou 730020,China;5.Center of Weather Modification of Shaanxi Province,Xi’an 710014,China

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    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。

    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.

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  • 收稿日期:2010-06-12
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