摘要
利用1961-2012年CN05.2的日平均温度、日最低温度和日最高温度,将3种温度资料冬季相邻两天的降温情况分为弱降温、一般性降温和强降温3类,并分析了这3类降温的时空分布特征。结果表明:日平均温度和日最低温度的弱降温和一般性降温发生频次最大的地区位于大、小兴安岭地区和长白山山脉一带,而强降温发生频次最大的区域则为长白山山脉一带;这三类降温的高频发生时段均为20世纪60年代和70年代,随后开始减少,到21世纪初为发生频次最少时段。对日最高温度而言,弱降温和一般性降温高频发区为42°-45°N,呈带状分布,其北部和南部均为一般性降温发生频次的低发区,呈现"低-高-低"的频次分布特征,而强降温的高频发生区则位于长白山山脉一带;同日平均温度和日最低温度年代际变化特征一样,日最高温度3类降温均在20世纪60年代和70年代频次最大,其后发生频次开始减少。
Using the daily mean,maximum,and minimum surface air temperatures(abbreviated as Tmean,Tmax,and Tmin)data from CN05.2 for the period from 1961 to 2012,the temperature decline events(TDEs)were determined in the present study.These TDEs were classified into three categories according to the range of temperature dropping,i.e.,the weak decrease in temperature(WDT),normal decrease in temperature(NDT),and a strong decrease in temperature(SDT).The temporal and spatial distribution characteristics of the occurrence frequency of TDEs were examined in this paper.Results show that,for Tmean and Tmin,the highest frequency of the occurrence of WDT and NDT appears in the Daxing'anling Mountain,Xiaoxing'anling Mountain and Changbai Mountain,but the highest frequency of the occurrence of SDT appears only in Changbai Mountain.In addition,the three TDE category events happen frequently in 1960s and 1970s,but less in 2000s.For Tmax,the highest frequency of occurrence of the WDT and NDT appears in a belt area among 42°-45°N,but less in north and south of this belt,showing a frequency distribution pattern of low-high-low.The highest frequency of the SDT events appears only in Changbai Mountain.The events of the WDT,NDT and SDT mostly happen in 1960s and 1970s,but very less in 2000s.
作者
李尚锋
高枞亭
杨旭
尹路婷
LI Shang-feng;GAO Zong-ting;YANG Xu;YIN Lu-ting(Jilin Provincial Key Laboratory of Changbai Mountain Meteorology&Climate Change,Laboratory of Research for Middle-High Latitude Circulation Systems and East Asian Monsoon,Institute of Meteorological Sciences of Jilin Province,Changchun 130062,China;Jilin Meteorological Observatory,Changchun 130062,China)
出处
《气象与环境学报》
2019年第6期77-84,共8页
Journal of Meteorology and Environment
基金
国家自然科学基金(41875119、41630424、41790471)
国家自然科学基金委员会国际(地区)合作与交流项目(1661144007)
中国气象局省级气象科研所科技创新发展项目(SSFZ201806)共同资助
关键词
东北冬季
降温
发生频次
年代际
Winter in Northeast China
Temperature decline
Occurrence frequency
Interdecadal
