| 基于地基宽带辐射观测资料的云检测算法改进 |
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| 引用本文： | 汤金平,王普才,夏祥鳌.基于地基宽带辐射观测资料的云检测算法改进[J].气候与环境研究,2011,16(5):609-619. |
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| 作者姓名： | 汤金平 王普才 夏祥鳌 |
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| 作者单位： | 中国科学院大气物理研究所中层大气和全球环境探测重点实验室,北京,100029 |
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| 基金项目： | 国家自然科学基金项目40875084、40775009，国家重点基础研究发展计划项目2006CB403702，中国科学院知识创新工程重要方向项目KZCX2-YW-QN201 |
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| 摘 要： | 利用地表太阳总辐射和散射辐射对Long and Ackerman (2000)的云检测算法进行了改进,提高了云判别的准确率.首先采用比值概率密度峰值法,初步选出晴天时刻.然后根据晴天时刻的地表太阳总辐射和太阳天顶角余弦值,拟合得到该日晴天总辐射近似表达式.在此基础上,计算各时刻实际观测值与用该拟合式估计的总辐射的比值,...
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| 关 键 词： | 辐射 云检测 概率密度峰值 云辐射强迫 |
Modification of Cloud-Screening Method Using Ground-Based Broadband Shortwave Irradiance Measurements |
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| TANG Jinping,WANG Pucai and XIA Xiang''ao.Modification of Cloud-Screening Method Using Ground-Based Broadband Shortwave Irradiance Measurements[J].Climatic and Environmental Research,2011,16(5):609-619. |
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| Authors: | TANG Jinping WANG Pucai and XIA Xiang'ao |
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| Institution: | TANG Jinping,WANG Pucai,and XIA Xiang'ao Key Laboratory for Middle Atmosphere and Global Environment Observation,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029 |
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| Abstract: | A modified automatic cloud-screening method is developed using 1-min measurement of surface downwelling shortwave global and diffuse irradiance.Clear skies are detected firstly by peak frequency density of ratio(PFDR) method.Then the detected clear-sky irradiance measurements are used to fit the expected clear-sky irradiance as the function of the cosine of the solar zenith angle by the least squares fitting method.Afterwards,the PFDR method is applied to the ratio of observed total shortwave irradiance to ... |
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| Keywords: | irradiance cloud detection peak frequency density cloud radiative forcing |
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