基于百分位阈值法的洞庭湖流域高温热浪时空特征  

Spatiotemporal characteristics of high temperature and heat wave in Dongting Lake Basin based on percentile threshold method

作　　者：张秋锦 黄一民[1] 郝丽婷 李丽蓉 杨梓琪 ZHANG Qiujin;HUANG Yimin;HAO Liting;LI Lirong;YANG Ziqi(Hengyang Normal University,Hengyang 421002,China)

机构地区：[1]衡阳师范学院,湖南衡阳421002

出　　处：《气象与环境学报》2025年第1期66-73,共8页Journal of Meteorology and Environment

基　　金：湖南省教育厅重点项目(23A490);湖南省教育厅优秀青年项目(22B0716);湖南省环境教育研究中心开放基金项目(HJ18K01)资助。

摘　　要：基于洞庭湖流域110个地面气象站点1961—2022年逐日最高气温和最低气温观测资料,采用百分位阈值确定了流域内各个站点暖日阈值和暖夜阈值,分析了洞庭湖流域暖日日数、暖夜日数、复合高温及高温热浪(频次、日数、强度)的时空变化特征。结果表明:洞庭湖流域暖日阈值和暖夜阈值均呈现出自西南向东北逐渐增加,这显然受流域西南高东北低的地形影响。流域年均暖日和暖夜日数均呈显著增加趋势,前者气候倾向率为1.6 d/10 a,后者达到2.6 d/10 a,即暖夜日数增加更快。流域暖日日数及暖夜日数的变化趋势在空间均呈现出流域中心低,四周高。另外,流域复合高温日数以及强度也均呈显著增加(增强)的趋势,气候倾向率分别为1.3 d/10 a、3.2℃/10 a,2000年以来,两者均表现出增速(增强)加快。流域高温热浪频次、日数均呈由西南向东北增加,高温热浪强度则表现为由南向北增加。研究时段内,流域高温热浪频次、日数、强度均呈显著增加趋势,气候倾向率分别为0.2次/10 a、1.3 d/10 a、2.0℃/10 a。热浪频次及热浪强度的变化趋势均呈现北中南三个带的差异,南北两带均比中部增加(增强)明显。流域年均热浪日数的变化趋势大致由流域中心向四周增加,流域东北部的洞庭湖区增加最明显,气候倾向率高达3.0 d/10 a。Based on daily maximum and minimum temperature observation data from 110 surface meteorological stations in the Dongting Lake basin from 1961 to 2022,the percentile threshold was used to determine the warm day threshold and the warm night threshold for each station.The spatial-temporal variation characteristics of warm days,warm nights,compound high temperature,high temperature heat wave frequency,high temperature heat wave days,and high temperature heat wave intensity in the Dongting Lake basin were analyzed.The results show that the warm day threshold and the warm night threshold in the Dongting Lake basin are gradually increasing from southwest to northeast,which is obviously affected by the topography of high in southwest and low in northeast.The average annual warm days and warm night days in the basin show a significant increasing trend.The former has a climate tendency rate of 1.6 d per decade,while the latter reaches 2.6 d per decade,indicating that the number of warm night days increases faster than the number of warm day days.The trend of changes in the number of warm days and warm nights in the watershed shows a low center and a high surrounding area in space.In addition,the number and intensity of composite high temperature days in the watershed also show a significant increasing(enhancement)trend,with climate tendency rates of 1.3 d per decade and 3.2℃ per decade,respectively.Since 2000,the number and intensity of composite high temperature days have shown an accelerated growth(enhancement)trend.The frequency and number of days of high-temperature heat waves in the watershed show a spatial distribution pattern of increasing from southwest to northeast,while the intensity of high-temperature heat waves increases from south to north.During the study period,the frequency,number of days and intensity of high temperature heat waves in the Dongting Lake basin showed a significant increasing trend,and the climate tendency rates were 0.2 times per decade,1.3 d per decade and 2.0℃ per decade,respectively.

关 键 词：高温热浪 暖日阈值 暖夜阈值 

分 类 号：P467[天文地球—大气科学及气象学]