Characteristics of Ozone Variations in Lhasa in Recent Years

The variation characteristics of ozone in Lhasa in recent years were analyzed by using Brewer spectrometer observation data. The results showed that ozone was mainly distributed in 15-35 km in atmosphere in Lhasa; the peak value by inversion was in 21-25 km; by comparison of ozone vertical distribution in Lhasa, it can be concluded that ozone differs insignificantly in middle-to-high layers in stratosphere and the distribution is similar over 36 km. The difference can be observed from the fact that ozone concentration is higher in winter and spring compared with summer and autumn from ground to the height at 21 km. In recent 4 years, annual average of total ozone in Lhasa was of little variations and extreme values of ozone appeared in winter and spring. Monthly averages were lower in August and September, and the lower value of ozone kept longer in 2008 for 23 d.

拉萨市总云量对红斑权重UVB的影响

根据2008年拉萨站总云量资料以及臭氧光谱仪（BREWER）观测得到的红斑权重UVB资料,分析了总云量对红斑权重UVB的影响.结果表明,总云量为1～4成时,对红斑权重UVB平均增减幅度不大;总云量为6～ 10成时,对红斑权重UVB的平均影响表现为衰减,且平均衰减程度随云量等级变高而加剧,总云量等级越高,红斑权重UVB增强概率越小;各级总云量云层反射辐射对红斑权重UVB的平均增强幅度没有明显规律,平均增幅为19.2％;在被太阳直接照射的情况下,有云天气将承受比晴天更强的紫外线辐射,因此有云天气要更加注意紫外线辐射的防护.

近几年拉萨上空大气臭氧变化特征

利用Brewer分光光谱仪观测资料分析青藏高原拉萨站近几年大气臭氧的变化特征,结果表明,拉萨上空臭氧主要分布在15～35km,反演结果的峰值出现在21～25 km。对比拉萨四季臭氧垂直分布发现,它们在平流层中上层的差异不大,且在36 km以上的分布大致相同,差异主要表现在从地面到21 km,冬春季的臭氧数密度大于夏秋季,近4年来拉萨的年平均臭氧总量的变化不大,臭氧总量的极值出现在冬春季节,臭氧总量的月平均值在8和9月较低,2008年6～9月臭氧低值的持续时间是近几年中最长的,达23 d。

浅谈SL3-1型雨量传感器故障分析排除和维护

雨量传感器是地面气象观测自动站的重要观测项目之一的传感器，在公共气象服务中对降水量的应用也较多，特别在降水预报中是非常重要的，目前地面气象观测自动气象站都装有翻斗式和称重武两种降水传感器；雨量传感器的故障将造成降水测量产生误差或是缺测，本文针对SL3-1型翻斗式雨量传感器在日常使用工作中常见的故障进行分析和维护，对做好地面气象观测自动站SL3—1型翻斗式雨量传感器日常维护具有一定的参考价值。