近30年甘南州气候变化特征分析

Analysis of Climate Change in Gannan Prefecture,Gansu Province in the Past 30 Years

【目的】研究甘南州近30年间的气温、降水量的变化特征。【方法】以甘南州1992—2022年的气温、降水量等气象数据为依据,通过数学统计与一元线性分析的方法探究其变化。【结果】(1)甘南州的气温最热月份平均最高温度为17.6℃,平均最低温度为-10.9℃。春季、秋季温度基本上持平。近30年间甘南州温度年平均变化趋势的斜率为正,说明气温有缓缓上升的趋势。(2)甘南州的降水量主要集中在6、7、8月份,即夏季,夏季降水量占全年降水量的46.4%~58.4%,其他年份、季节降水量趋于平稳,并无明显变化。【结论】甘南州气候变化受到全球变暖的调控,且春季降水量有降低的趋势,其他季节变化不明显。

[Purposes]The variation characteristics of temperature and precipitation in Gannan Prefecture in recent 30 years were studied.[Methods]Based on the meteorological data such as temperature and precipitation in Gannan Prefecture from 1992 to 2022,the changes were explored by mathematical statis-tics and linear analysis.[Findings]The average highest temperature in the hottest month of Gannan Pre-fecture is 17.6℃,and the average lowest temperature is-10.9℃.The temperature in spring and autumn remains basically unchanged.The slope of the annual average temperature change trend over the past 30 years is positive,indicating a gradual upward trend in temperature;the precipitation in Gannan Prefec-ture is mainly concentrated in June,July,and August,namely summer.Summer precipitation accounts for 46.4%to 58.4%of the annual precipitation,while precipitation in other years and seasons tends to stabilize without significant changes.[Conclusions]The climate change in Gannan Prefecture is regu-lated by global warming,and the precipitation in spring has a decreasing trend,and the changes in other seasons are not obvious.