宜昌近 51 年气温变化分析

采用宜昌市1962-2012年气象观测资料，对宜昌市城区（以下简称宜昌）近51年气温值进行滑动平均分析和相关线性拟合，研究近51年宜昌气温变化特征。结果表明，宜昌近51年来年平均气温、夏季平均气温和冬季平均气温均呈波动上升趋势，冬季增温速率大于夏季；年极端最低气温呈现出明显的上升趋势，年极端最高气温呈下降趋势；年平均气温日较差呈明显下降趋势，夏季平均气温日较差变化显著下降，冬季平均气温日较差则相对平缓；气温年较差显著下降。总体而言，宜昌近51年气温变化趋势与我国气候变化的趋势相一致，但其增温速率明显低于全国水平和东部沿海地区的水平。

Analysis of Temperature Variation in Yichang in Recent 51 Years

Based on the meteorological data of Yichang from 1962 to 2012, the temperature variations were statistically analyzed with 5a moving average analysis and simple linear regression method. The variation characteristics of temperature in Yichang in recent 51 years were studied. The results showed that the annual mean temperature, the average temperature in summer and winter of Yichang appeared a volatile rising. The rising rate of the average temperature was higher in summer than in winter. The annual minimum temperature suggested increasing trend, but the annual maximum temperature was decreasing. The average annual temperature diurnal range appeared a deceasing trend, the summer mean temperature diumal range declined significantly, and winter mean temperature diurnal range changed slightly. The annual tem- perature range deceased. Overall, the temperature variation during 51 years in Yichang, was consistent with the trend of climate change in China, but its rate of warming was lower than the national level and the level of the eastern coastal areas obviously.