Subjects: Geosciences >> Atmospheric Sciences submitted time 2023-08-25 Cooperative journals: 《干旱区研究》
Abstract： This study has aimed to evaluate the characteristics of the atmospheric environmental capacity and itsinfluencing factors in Ningxia. The temporal and spatial distribution of the A value of the atmosphericenvironmental capacity and its main meteorological influencing factors were analyzed using daily fixed timehistorical observation data from meteorological stations between 1961 and 2018, based on the box modelprinciple. The atmospheric environmental capacity in 2018 was also evaluated and zoned. The results showed thatthe A value of the atmospheric environmental capacity showed a decreasing trend in all seasons, with a rate of-0.47 ×104~-0.24 ×104 km2 ·(10a) − 1. The annual average A value was largest in the summer, followed by thespring, and then autumn and winter. The monthly A value showed a single peak pattern, with a maximum inAugust and minimum in December. It was generally high in the south and low in the north in space, andinfluenced by the topography of Helan Mountain and Liupan Mountain, regional precipitation, and other climaticfactors. The low value center for A was located in Yinchuan and Shizuishan City, while the high value center waslocated in the south of Guyuan City. Wind speed and mixed layer height changes had a significant influence onthe interdecadal evolution trend of the atmospheric environmental capacity of A in the Ningxia Hui AutonomousRegion. There were obvious seasonal and regional differences on the impacts of precipitation and wind speed.For example, wind speed had a greater contribution to the A value in spring in the north, and precipitation had agreater contribution to the A value in summer and autumn in the south. This was affected by high energyconsuming industries such as metallurgy, thermal power, the chemical industry, and construction and vehicleemissions. Pingluo County and Litong District were the critical overload and overload areas for the SO2 and NOxatmospheric environments, and the counties south of Litong District were high bearing areas in Ningxia.
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