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Calculation of Probability of Cloud-Free Lines-of-Sight at Given Heights in Foshan, China


doi: 10.1007/BF02973089

  • Based on Lund and Shanklin's work (1972), methods of calculating Probability of Cloud-Free Lines-of-Sight (PCFLOS), Persistence Probability of Cloud-Free Lines-of-Sight (PPCFLOS) and Recur-rence Probability of Cloud-free Lines-or-Sight (RPCFLOS) at given heights are presented. PCFLOS, PPCFLOS and RPCFLOS are calculated in Foshan, China by conventional observation data from 1961 to 1990. The conclusions are: (1) The higher the elevations, the smaller the PCFLOS and the larger the view angles, the larger the PCFLOS. (2) PPCFLOS and RPCFLOS decrease with the increase of elevation and the delay of time. (3) RPCFLOS is always equal to or larger than PPCFLOS at lag times.
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Manuscript History

Manuscript received: 10 April 1999
Manuscript revised: 10 April 1999
通讯作者: 陈斌, bchen63@163.com
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Calculation of Probability of Cloud-Free Lines-of-Sight at Given Heights in Foshan, China

  • 1. Air Force Institute of Meteorology, Nanjing 211101,Air Force Institute of Meteorology, Nanjing 211101

Abstract: Based on Lund and Shanklin's work (1972), methods of calculating Probability of Cloud-Free Lines-of-Sight (PCFLOS), Persistence Probability of Cloud-Free Lines-of-Sight (PPCFLOS) and Recur-rence Probability of Cloud-free Lines-or-Sight (RPCFLOS) at given heights are presented. PCFLOS, PPCFLOS and RPCFLOS are calculated in Foshan, China by conventional observation data from 1961 to 1990. The conclusions are: (1) The higher the elevations, the smaller the PCFLOS and the larger the view angles, the larger the PCFLOS. (2) PPCFLOS and RPCFLOS decrease with the increase of elevation and the delay of time. (3) RPCFLOS is always equal to or larger than PPCFLOS at lag times.

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