中国云南地区地面紫外辐射观测

 在云南丽江(26°52′N,100°13′E)和勐腊(21°29′N,101°34′E)两地分别对以254nm和297nm为中心波长的太阳紫外辐射作了地面观测.观测时间为1999年7月～2000年5月.本文分析了两地紫外辐射的时空变化并初步讨论了与云量、臭氧总量的相关关系.研究结果表明:297nm波段的紫外辐射夏季强,冬季弱,具有明显的季节变化.丽江地区的紫外辐射在同一云量条件下高于勐腊地区,这可能是由海拔高度的差异引起.云量对两地的紫外辐射变化有强烈的影响,而当剔除云量、季节和随机变化等影响因素后,紫外辐射和臭氧总量呈现出了负的相关关系.

Ground-based measurements of ultraviolet radiation in Yunnan, China

Measurements of surface ultraviolet radiation in two narrow bands centered at 254 nm and 297 nm werecarried out from July 1999 to May 2000 at two sites, Lijiang (26°52'N, 100°13'E) and Mengla (21°29'N, 101°34'E), in Yunnan. In addition to the temporal and spatial variation of UV irradiance, preliminary effects of cloud coverand total ozone column on the surface ultraviolet radiation are analyzed. The study results show that the UV irradi-ances at 297 nm manifest a seasonal variation, which is high in summer and low in winter. The UV radiation is in-tenser at Lijiang than that at Mengla under the same sky condition, which may be caused by the effect of altitude. Thedoud cover has a strong impact on the UV radiation, and a negative correlation between the UV irradiance and the to-tal ozone column is exhibited after eliminating the influence of cloud cover, seasonal variation and random variation.