前期东北大西洋-地中海西部海温异常影响河南省干热风的可能途径  

Potential Impact of the Northeastern Atlantic-Western Mediterranean Sea Surface Temperature on the Dry-hot Wind in Henan Province

作　　者：竹磊磊 苏晓乐[1,2] 潘攀 吴璐 杨婷[1,2] ZHU Leilei;SU Xiaole;PAN Pan;WU Lu;YANG Ting(CMA•Henan Key Laboratory of Agrometeorological Support and Applied Technique,Zhengzhou 450003,Henan,China;Henan Climate Center,Zhengzhou 450003,Henan,China)

机构地区：[1]中国气象局•河南省农业气象保障与应用技术重点开放实验室,河南郑州450003 [2]河南省气候中心,河南郑州450003

出　　处：《高原气象》2025年第1期150-162,共13页Plateau Meteorology

基　　金：河南省气象局气象科学技术研究面上项目(KM202307);中国气象局复盘总结专项(FPZJ2024-080);河南省科技攻关项目(242102320008)。

摘　　要：河南省是中国冬小麦的主产区,也是较易受干热风影响的地区。目前对干热风的研究和预报多在天气尺度,从气候的角度研究干热风是否具有可预报性,具有非常重要的意义。本文基于河南省干热风资料、NCEP/NCAR再分析资料和哈得莱环流中心海温资料,分析了1980-2022年前期海温异常与河南省干热风日数的关系,及其可能影响途径。结果表明:(1)豫北、豫西北和豫中多年平均干热风日数较多,其他地区则相对较少。日干热风出现的概率由南向北、由5月下旬至6月上旬逐渐增加。全省平均干热风日数有显著增加趋势。(2)河南省干热风日数与当年3-4月东北大西洋-地中海西部(关键区)海温在年代际和年际尺度上均存在着密切相关,两者与干热风发生时段500 hPa高度场在去趋势前和去趋势后的显著正相关区在东亚中纬度地区位于新疆北部至贝加尔湖尔湖北部,显著负相关区位于我国东北至日本群岛附近,与850 hPa风场在去趋势前和去趋势后的相关在上述正、负显著相关区分别呈反气旋和气旋分布,气旋后部呈偏北风的显著相关,即3-4月关键区高海温年,出现的蒙古高压脊和东亚大槽造成了河南省的干热风天气。海温与环流场的相关在去趋势前和去趋势后在中纬度地区呈现出一个更明显的由东北大西洋经欧亚大陆至东北亚的纬向遥相关波列。(3)西太平洋副热带高压(以下简称副高)偏南(北)时,干热风日数易偏多(少),而3-4月关键区高(低)海温则可以导致副高偏南(北)。(4)干热风偏多年和偏少年、3-4月关键区高海温年和低海温的干热风发生时段30°N-55°N经向平均的涡度差值,及高、低海温年的干热风发生时段500 hPa准地转流函数距平和波作用通量均显示在中纬度地区存在自东北大西洋至东北亚的纬向波列。也即表明,3-4月关键区海温可以激发出一个后期干热风发生时段的类�Henan Province is the main producing area of winter wheat in China,and it is also susceptible to dryhot wind.At present,the research and forecast of dry-hot wind both are on the weather scale,it is of great significance to study whether the dry-hot wind is predictable from the perspective of climate.This study analyzed the relationship between dry-hot wind days in Henan Province and preceding sea surface temperatures(SST)from 1980 to 2022,as well as potential influencing pathways,based on the dry-hot wind data from Henan Province,NCEP/NCAR reanalysis data,and SST data from the Hadley Centre.The results show that:(1)The mean annual dry-hot wind days in northern,northwestern and central Henan Province is more than that in other regions.The probability of dry-hot wind occurrence in the day gradually increases from south to north,and from late May to early June.The average number of dry-hot wind days in the province has a significant increasing trend.(2)There is a close correlation between the number of dry-hot wind days in Henan and the March-April SST in the northeastern Atlantic-western Mediterranean(key region)on both decadal and interannual scales.The correlations between the above two and the 500 hPa geopotential height during dry-hot wind periods,before and after detrending,indicate significant positive correlation areas in mid-latitude East Asia,located from northern Xinjiang to north of the Lake Baikal,and significant negative correlation areas located from northeastern China to the Japanese archipelago,respectively.Correlations with 850 hPa wind fields show anticyclonic and cyclonic distributions in these significant correlation areas,respectively.There is significant correlation of northerly wind in the rear of cyclone,That is,in years with high SST in the key region in March-April,the dry-hot wind weather in Henan Province was formed under the influence of the Mongolian high pressure ridge and the East Asian trough.The correlations between the key region SST index and the circulation fields exhibits a mor

关 键 词：干热风 东北大西洋 地中海西部 海温 遥相关波列 

分 类 号：P461.2[天文地球—大气科学及气象学]