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CLOUDS AND CLOUD AMOUNT AS BASIC DATA FOR THE THERMAL AND LUMINOUS ENVIRONMENT

作为热环境和光环境基本数据的云和云量

基本信息

批准号：
03452227
负责人：
NAKAMURA Hiroshi
金额：
$ 4.35万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-03452227/
关键词：
Cloud amount Automatic measurement of cloud amount Color of blue sky Color of cloud 青天空の色

项目摘要

The following results suggest possibility of developing automatic long-term continuous measurement instrument of cloud amount. (1)Measurement of cloud amount and color of the sky Sky luminance and chromaticity of light from the sky were measured using a color luminance photometer. Besides, photographs with a fisheye lens and sletches of the sky were made. Visual judgment of sky conditions at each measurement point and visual observation of cloud amount were also made. (2)Determination of sky conditions by color temperature Color temperature of blue sky is higher than 10000K.Color temperatures of blue sky and cloud are mixed in lower than 10000K.Color temperature of cloud ranges from about 3000K about 8500K, and occurs frequently in the range of 5500K.It seems possible to judge sky conditions by color temperature at a large angular distance from the sun. (3)Numerical formula of color temperature of blue sky Color temperature of blue sky was expressed numerically with solar altitude, an elevation of the sky element, angular distance between the sky element and the sun, and atmospheric transmittance. (4)Regression equations on color temperature for the boundary between blue sky and cloud It si difficult to judge sky conditions only by color temperature at the low elevation and in the vicinity of the sun. Regression equations were obtained on color temperature for the boundary between blue sky and cloud in relation to each of solar altitude, an elevation of the sky element and angular distance between the sky element and the sun. (5)Comparison between the abserved cloud amount and the estimated cloud amount Cloud amount was estimated with the data re-sorted into the groups of blue sky and cloud according to the boundary conditions in (4). Cloud amount was estimated in another way by integrating the zones visually-judged as cloud. Comparison between the observed cloud amount and two kinds of the estimated cloud amount resulted in about 75% agreement allowing the differe

结果表明，研制自动化长期连续测量云量的仪器是可行的。（1）天空的云量和颜色的测量使用彩色亮度光度计测量天空光的亮度和色度。此外，还用鱼眼透镜拍摄了天空的照片。还对各测点的天空情况进行了目视判断，对云量进行了目视观测。（2）用色温确定天空状况蓝天的色温高于10000K，蓝天和云的色温混合在10000K以下，云的色温在3000K左右8500K左右，在5500K的范围内频繁出现，似乎可以通过距太阳较大角距离处的色温来判断天空状况。（3）蓝天色温的数值计算公式蓝天色温与太阳高度、天空要素高度、天空要素与太阳的角距离、大气透过率等参数之间的关系用数值表示。（4）蓝天与云分界线的色温回归方程仅凭低海拔和太阳附近的色温很难判断天空状况。得到了蓝天云边界色温与太阳高度、天元高度和天元与太阳角距离的回归方程。（5）观测云量与估算云量的比较根据（4）中的边界条件将数据重新分类为蓝天和云两组来估算云量。通过整合视觉上判断为云的区域，以另一种方式估计云量。观测云量与两种估算云量的比较，一致率约为75%，