Variation trends in atmospheric visibility and influence factors in Sichuan basin over 1961—2010 period

doi:10.7523/j.issn.2095-6134.2014.03.018

Abstract

Abstract:

On the basis of the 50-year (1961-2010) data observed at 122 meteorological stations in Sichuan basin, we studied the monthly, seasonal, and annual distributions of visibility in the basin as well as the interannual variations. The relations of the interannual variations of visibility with the meteorological factors (wind and air temperature), energy consumption, and increasing population were analyzed to explore the factors causing the visibility changes. The results showed that 1)the annual average of dry visibility in Sichuan basin was 18.8 km with four centers of low visibility (about 11 km) in association with the climate, population, industry, and urbanization; 2)over the 50 years, 87 sites (about 71%) in the basin were found to have negative trends in dry visibility with the change rates of-4.5~-0.07 km/10a, while 35 sites (about 29%) in the basin mostly located in the northern edge had positive trends in visibility with the change rates of 3.3~0.08 km/10a; 3)the visibility had significant seasonal variations with the highest in summer and the lowest in winter; and 4)the reduction of atmospheric visibility in the basin is closely related to the declining wind, warming air, increasing energy consumption, and population.

Key words: atmospheric visibility, trends, influencing factors, Sichuan basin

CLC Number:

P413

GUO Xiaomei, ZHOU Chengxia, ZHAO Tianliang, CHEN Juan, ZHENG Xiaobo. Variation trends in atmospheric visibility and influence factors in Sichuan basin over 1961—2010 period[J]. , 2014, 31(3): 418-425.

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