| 利用全天空数字图像对北京上空云况分布特征的试验分析 |
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| 引用本文： | 霍娟,吕达仁.利用全天空数字图像对北京上空云况分布特征的试验分析[J].气象科学,2005,25(3):238-243. |
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| 作者姓名： | 霍娟 吕达仁 |
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| 作者单位： | 中国科学院大气物理研究所LAGEO,北京,100029 |
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| 基金项目： | 国家自然科学基金委科学仪器专项基金(编号:40027002)，科技部重大基础前期专项基金(编号:No.2001CCAA02200)共同资助 |
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| 摘 要： | 利用最新获取的近两年北京上空全天空数字图像资料对云况分布做统计分析,以获得云的分布特征。工作中将图像分为9个扇区和16个环区分别进行分析,从结果看,无云(云量<1)与全天空有云天气(云量>9)情况明显占优,平均各占总量的36%,46%。除去系统误差及计算所带来的误差发现,两年中北京上空多以晴好天气(包含薄卷云)和阴天为主。上空西北部云的分布略显偏多,头顶上空云的出现概率较其他位置低,并有随天顶角增大概率增大的趋势。
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| 关 键 词： | 全天空 数字图像 云分布 |
| 收稿时间： | 2003/3/25 0:00:00 |
| 修稿时间： | 2003年3月25日 |
ANALYSIS OF CLOUD'S DISTRIBUTION IN BEIJING WITH ALL-SKY IMAGES |
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| Huo Juan and Lu Daren.ANALYSIS OF CLOUD''S DISTRIBUTION IN BEIJING WITH ALL-SKY IMAGES[J].Scientia Meteorologica Sinica,2005,25(3):238-243. |
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| Authors: | Huo Juan and Lu Daren |
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| Institution: | LAGEO, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029;LAGEO, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 |
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| Abstract: | Based on all-sky images over Beijing taken by a digital camera with fish-eye lens in 2001~2003,statistical analysis is made for cloud distribution in different sky zones. Two kinds of sky zone classification are used. One is dividing the whole sky as 9 fans and the other is 16 circular zones. Results show that the cases of the clear-sky (or cloud cover less than 1) and overcast (cloud cover lager than 9) account for the most part of the data images, and each case accounts for about 36%, 46%. The cloud cover of the northwest side is statistically larger than other directions, which resulted from the effect of western mountains. With the increase of the zenith angle, the frequency of cloud appearance becomes lager, which is the effect of vertical extent of clouds. |
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