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湿润指数是衡量一个地区气候干湿程度的指标,也是反映该地区综合气候特征的一种定量指标,在研究气候、气候变化以及环境评价中应用广泛。本文利用近50 a来德州市的气象资料,采用两种方法计算湿润指数,研究德州市气候干湿程度及其变化。研究表明:50 a来德州湿润指数有较明显的下降趋势,气候进一步干旱化,这种变化与降水减少、气温升高有关;季节湿润指数差异很大,夏季较湿润,春季干燥;彭曼法得到的湿润指数比环评法的小,且降水量大,差值也大,并存在季节变化。
Moisture index is a measure of the extent of a region’s climate dry and wet, but also reflects the region’s comprehensive climate characteristics of a quantitative index, in research climate, climate change and environmental assessment is widely used. Based on the meteorological data of Dezhou in the past 50 years, two methods were used to calculate the wetness index and the degree of dry-wet climate in Dezhou. The results show that the wetness index of Texas has a clear downward trend in 50 years, and the climate is further aridified. The change is related to the decrease of precipitation and the increase of air temperature. The seasonal wetness index is quite different, wet in summer and dry in spring. Moisture index is smaller than the EIA method, and the precipitation is large, the difference is also large, and there are seasonal changes.