摘要
利用辽宁省1981—2009年主要河流冻结和解冻日期观测资料,分析河流冻结日期、解冻日期、封冻期的变化特征及其对气候变暖的响应。结果表明,辽宁省各流域河流平均冻结日期最早出现在11月3日,最晚在11月15日;河流平均解冻日期最早出现在3月15日,最晚在3月30日;平均封冻期为120～146 d。1981—2009年河流冻结和解冻日期分别呈显著的推迟和提前趋势,封冻期呈显著减少趋势;冻结日期的早晚受11月最低气温的影响较大,同年3月地面温度的升高对解冻日期的提前影响最大,封冻期的长短对11月至次年3月平均气温的变化最为敏感。
Characters of the freeze/thaw date of river ice in the Liaohe,Yalu,and Linghe River basins and their responses to regional warming are investigated in the period 1981-2009.The results show that the freeze dates ranged from 3 to 15 November,the thaw dates appeared within15-30 March,and the average frozen durations of the three basins ranged from 120 to 146 days.In the past 29 years,the freeze（thaw） date has shown a postponing（bring-forward） trend,thereby the frozen duration has shortened significantly.The river＇s freeze date was mainly influenced by November＇s minimum surface air temperature,while the river＇s thaw date was mostly sensitive to the increasing of ground surface temperature in March,and the frozen duration was most sensitive to the average surface air temperature of November to next March.
出处
《气候变化研究进展》
CSCD
2011年第6期418-422,共5页
Climate Change Research
基金
中国气象局气象关键技术集成与应用项目(CMAGJ2011M14)
关键词
河冰
封冻期
气候变暖
响应
river ice
frozen duration
regional warming
response
