Homogeneity Analysis of Historical Meteorological Data at Wutaishan
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Abstract:
According to the metadata of in situ observation at Wutaishan (53588) of Shanxi Province, including information about station relocation, instrumentation change, and observing and data processing procedure changes, etc., the homogeneities of annual and seasonal mean, maximum and minimum temperatures, relative humidity, and precipitation time series are analyzed from January 1957 to 2005. The reference series for different meteorological variables are constructed by combining the corresponding observed data at five nearby stations with the largest correlation in candidate stations, and then based on the Standard Normal Homogeneity Test (SNHT) technique, each meteorological variable is statistically tested, respectively. The discontinuous points obtained from SNHT are analyzed and compared. Results indicate that the influence of station relocation on 1 January 1998 on the homogeneities of different meteorological variables mentioned above is very obvious, and that on the maximum temperature time series is the most significant, being 5.5 ℃. Further analysis shows that this station relocation has different effects on the other meteorological variables time series; for example, the influence on the homogeneities of annual and spring relative humidity time series are also obvious, but not on precipitation. The tests and adjustment of the in situ climatic data series used frequently are important to local climate change researches. The effects of various “nonclimate” factors on different meteorological variables vary, so more careful distinction and further research are needed.
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Clc Number:
TP273.5 TN959.4
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.