ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Effect of Changing of Ground Weather Monitoring Specification in 1980 on Visibility Data Continuity
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Abstract:
Ground weather monitoring specification has been changed in 1980. To well understand the effect of the change to the visibility data continuity, the visibility data in Nanning and Guilin from 1951 to 2006 are analyzed using the accumulated percentage method, Ridit method and “very good day” method. The results show that high values of visibility in Nanning and Guilin rapidly decrease in 1980 in contrast to 1979, which results in rapidly descending of Ridit average value and “very good day” number. The reason for rapid decrease is the change of ground weather monitoring specification in 1980. Therefore it is unreliable to use visibility high value, Ridit average value and “very good day” number to analyze visibility data around 1980.But visibility middle value and low value in Nanning and Guilin are not affected by the change of ground weather monitoring specification in 1980, which means it is reliable to use visibility middle value and low value to analyze visibility data around 1980.
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