摘要
为了解黄河源区极端气候变化规律,基于黄河源区及附近17个气象站1961~2013年逐日最高、最低气温和日降水量数据,利用极端气候指数并结合Mann-Kendall（M-K）趋势法分析了黄河源区极端气温和降水事件的变化趋势。结果表明,近50年来黄河源区极端冷指数（霜冻指数、冰封日数和冷夜指数）呈显著性减小趋势,线性减幅分别为-5.2、-4.35、-2.18d/10a,温度日较差以0.16℃/10a显著性减小,极端暖指数（暖昼日数）呈显著性上升趋势,线性增幅为1.4d/10a;最大连续干日天数有减小趋势,而平均雨日降水强度、中雨天数、1d和5d最大降水量及年总降水量有增加趋势。
Based on the daily meteorological data from 17 stations over the source regions of the Yellow River and adjacent regions during 1961-2013,including daily maximum temperature,minimum temperature and daily precipitation,the change trends of extreme temperature and precipitation were analyzed by using extreme meteorological indices and MannKendall（M-K）trend test.The results show that there have significant down trend for frost day,icing day and cool nights over the past 50 years,and the linear trends were decreased-5.2d/10 a,-4.35d/10aand-2.18d/10 a,respectively;the diurnal temperature range has decreased by 0.16 ℃/10a;for the warm days,the trend was increased 1.4d/10 awith significantly upward trend;for the six precipitation extreme indices,there is one index（CDD）have significant negative trend while five indices（SDII,R10,RX1 DAY,RX5DAY and PRCPTOT）have various positive trends.
出处
《水电能源科学》
北大核心
2015年第2期6-9,36,共5页
Water Resources and Power
基金
国家自然科学基金项目(41171051)
