| 张倩,宋小全,刘金涛,戴光耀,吴松华.激光云高仪探测青藏高原夏季云底高度的研究[J].光电子激光,2016,27(4):406~412 |
| 激光云高仪探测青藏高原夏季云底高度的研究 |
| Observation of cloud base height with ceilometer in Tibetan Plateau during sum mer |
| 投稿时间：2015-11-11 |
| DOI： |
| 中文关键词: 青藏高原 CL31云高仪 云底高度 统计分析 |
| 英文关键词:Tibetan Plateau ceilometers cloud base height statistic analysis |
| 基金项目:国家自然科学基金(41375016,91337103,41576108)资助项目 (中国海洋大学 信息科学与工程学院海洋技术系,山东 青岛266100) |
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| 中文摘要: |
| 为研究青藏高原云底高度的特征,于2014 年7月7日 至2014年8月30日,在那曲地区(31.48°N,92.06°E),使用CL31云高 仪进行云底高度观测,共获取55days的有效探测数据。 初步统计分析表明,55days观测数据缺测率为0.4%,基本实现每天24h的全覆盖观测。 CL31激光云高仪最大观测高度为7.6km,对0～7.6km高度范围内全部观测数据进行每小时平 均。统计结果表明:那曲地区夏季有云存在的概率为78%,其余情况 为晴空即无云情况。 单层、两层和三层云的存在概率分别为65、12和1%,以单层云为主且 有明显的日 变化。夏季云主要分布在距地面2～6km高度,平均云底高度为2.58km。受云高仪探测高度的限制,没有考虑7.6km以上的云。 |
| 英文摘要: |
| In order to study the cloud base features of Tibetan Plateau,the in tensive observation of clouds and precipitations in Naqu area (31.48°N,92.06°E,4508.9m above mean sea level) was conducted from July 7to August 30,4with the support of the Chinese Third Ti betan Plateau Experiment of Atmospheric Sciences.A laser ceilometer CL31by Vaisala was used to observe cloud base heights and layers continuously for a total time of 55days.Prelimin ary statistical analysis results show that the data missing rate during all measured days is 0. 4%,and almost 24h full coverage observation is achieved.The maximum observation range of the ceilo meter CL31is 7.6km.All the observed data from 0to 7.6km above ground level are averaged pe r hour.The final statistical results show that the cloud appearance probability is 78% duri ng summer in Naqu, and the rest situation is cloudless case.The cloud appearance probabilities of s ingle-layer,double-layer and triple-layer clouds are 65%,12% and 1%,respectively.The single-layer clo ud is dominant and it has obvious diurnal variations.Clouds mainly distribute be tween 2km and 6km from ground height,and the average cloud base height is 2.582km.This conclusion doe sn′t include the clouds above 7.6km which can′t be detected by the CL31ceilo meter. |
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