中国地区近地面太阳紫外辐射的分布及其对大气臭氧层破坏的响应

Distribution of Solar Ultraviolet Radiation at the Ground and its Response to Atmospheric Ozone Depletion in China

本文在充分考虑太阳紫外辐射在大气中传输的物理过程的基础上,引入局地地面气压、臭氧和地表反照率的时空变化,利用Delta-Eddington近似法计算了中国地区冬季(1月)和夏季(7月)晴天时地面太阳紫外辐射(0.290—0.400μm)和紫外B辐射(0.290—0.325μm)的分布,并进一步计算出臭氧总量减少5％、15％时紫外B的变化.结果指出,由于臭氧总量的减少,中国北部地区紫外B的增加比南部地区显著.平均而言,臭氧总量减少1％时,冬季紫外B将增加1％左右,夏季紫外B将增加0.6％—0.7％.

In this paper, based on detailed physical processes of solar ultraviolet radiation travelling through the atmosphere, and taking into account of the spatial and temporal variation of local ground pressure, atmospheric ozone and ground albedo, the distribution of ground solar ultraviolet radiation UVB (0.290- 0.325μm) and UV (0.290- 0.400μm) radiation of clear sky in Jan. and July is claculated using the Delta-Eddington approximation method. Moreover, the variation of UVB (0.290- 0.325μm) due to ozone depletion of 5% and 15% is evaluated too. The results show that: The increase of UVB due to ozone depletion is greater in North China than that in South Chi -na. In average, the daily UVB radiance increases about 1% in Winter (Jan.) as ozone decreases 1%, while the corresponding value is 0.6- 0.7% in Summer (July).