Archive > Volume 33 Issue 2 > 2005,33(2):124-127 Prev Next

Difference of Two 30-Year Averages and Its Influence on Operational Climatic Analysis

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    Abstract:
    A comparison was made between the two 30-year climatic averages of meteorological elements from 1971 to 2000 and 1961 to 1990 from 39 meteorological stations used in Shaanxi climate prediction. The results show that the climate in the 1990s is drier and wormer than that in the 1960s in most areas, and some elements are especially obvious. Compared it with the 1961-1990 average, the 1971-2000 annual mean temperature and the days of sunny day increase, while the annual mean precipitation and the rainy days, overcast days, etc, decrease. The annual sunshine duration and the days of strong wind, sandstorm, and thunderstorm, etc, also decrease. For various long-range data series, the difference between the two averages is most obvious for the latest several (five to six) 30-year averages during the period from the 1920s to the 1990s. The difference of the two averages has certain impacts on the operation of climatic analysis and climatic prediction.

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    Project Supported:
    Clc Number:
    P468.02 P456.1

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