摘要
利用瓦里关1994年8月～2001年12月地面臭氧资料,分析了地面O3年季变化,以及不同天气条件下的日变化特征。结果表明,青藏高原洁净地区地面O3具有明显的季节变化且呈缓慢的上升趋势,春季浓度明显高于冬季,最高值出现在每年夏初,而最低值在12月左右。与低纬的Izana站相比,瓦里关地区地面O3浓度变化趋势与之比较相近,而且,亦呈逐年上升趋势。不同天气条件下,春、夏、秋、冬四个季节地面O3浓度变化不尽相同,晴天和多云天,春、夏、秋季的地面O3变化趋势基本一致,其中,春秋季,晴天O3值高于多云天和降雨天,而冬季和夏季则不明显,说明晴空天气虽然有利于O3浓度的增加,但并不是重要因子之一。各季节降雨、雪天O3浓度的变化情况来看,地面O3在春、秋、冬三个季节变化不大,而夏季与其它季节明显不同,变化幅度很大,日较差在四个季节中为最大,这与雨、雪的冲刷关系很大,并且可能存在雨、雪以及降雨强度的差异。
Based on the data of surface ozone in 1994.8～2001.12 over Waliguan, the seasonal variation and the characteristics of surface ozone under different sky condition are analyzed. The results show that the surface ozone over clean area in Qinghai-Xizang plateau has significant seasonal variation, and it also keeps increasing with low speed, the concentration of O_3 in spring is obviously higher than that in winter, the maximum is in the beginning of summer, the minimum is in January. Compared with Izana station in Spain, the annual variation of two stations is very close, and also keeps increasing slowly. Under different sky condition, the variation of O_3 in each season is also different;its variation in spring, summer and autumn is almost same. In spring and autumn, the O_3 value in clear day is higher than that in rainy or cloudy day while it is insignificant in winter and summer, it illustrates that the clear day is favorable to the increasing of O_3, but it is not so important. In rainy and snowy day, the variation of O_3 in spring, autumn and winter is not evident, but in summer, it is totally different from other seasons, its daily difference is the biggest among all seasons, this probably has some relationship with the washing of snow and rain, moreover the difference of snow and rain may be important to the elimination of O_3.
出处
《干旱气象》
2004年第1期1-7,共7页
Journal of Arid Meteorology
