六盘山区雾时空分布及微观特征

doi:10.3969/j.issn.1673-503X.2023.01.005

Abstract

Abstract:

Based on visibility information of the weather stations in Yuanzhouqu, Xiji, Liupan Mountain, Longde, and Jingyuan from 1989 to 2018 and in Pengyang from 1999 to 2018, as well as the data measured with fog droplet spectrometer at orographical cloud observation site and the conventional surface meteorological observation in Liupan Mountain from November 1, 2019 to October 31, 2020, the annual, seasonal, monthly and daily changes characteristics of fog and the droplet spectrum feature of typical fog in Liupan Mountain area were analyzed.The results showed that the fog has obviously temporal change characteristics and the number of fog days is an average of 118.5 d and the largest in autumn especially in September, and the largest frequency is at 08:00 in the daytime.Freezing fog mainly occurs from November 8 to April 22 of the next year and warm fog mainly occurs from May 5 to October 11.In addition, freezing fog and warm fog have a long maturity stage and short development and dissipating stage.During the maturity stage, the fog droplet spectrum is broadened, the average droplet number concentration is 4.58-107.57 per cm³, the average liquid water content is 0.001-0.049 g·m^-3, and the average droplet diameters is 3.75-12.22 μm.The values of the above-mentioned variables in Liupan Mountain all are smaller than those in Nanjing and Zhanjiang and Maoming.The droplet number concentration from the development to dissipation stage for freezing fog are larger than those for warm fog, the liquid water content and droplet diameters of freezing fog are larger from maturity to dissipation stage, but are smaller at the development stage than those of warm fog.The droplet size of freezing fog features single peak with a maximum at 6 μm where the maximum of dN/dD is 26.19 cm^-3·μm^-1, while the droplet size of warm fog features double peaks with the first and second peak values at 7 μm and 11 μm, respectively, which is the same as the situation of fog droplet spectrum in Lushan.However, the peak value of droplet diameters is larger than those in Nanjing and Zhanjiang.

Key words: Liupan Mountain area, Freezing fog, Warm fog, Microphysical structure

CLC Number:

P426.4⁺2

Zhang-li DANG,Jian-ren SANG,Xu ZHOU,Zhuo-lin CHANG,Yan-qiao SUN. Temporal and spatial distribution and characteristics of microphysical structure of fog in Liupan Mountain area[J]. Journal of Meteorology and Environment, 2023, 39(1): 37-43.

Figures/Tables 7

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站点	经度/°E	纬度/°N	海拔高度/m
原州区	106.26	36.00	1752
西吉	105.70	35.96	1921
六盘山	106.20	35.66	2842
隆德	106.11	35.61	2079
泾源	106.31	35.50	1949
彭阳	106.66	35.85	1479

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Temporal and spatial distribution and characteristics of microphysical structure of fog in Liupan Mountain area

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