CAJ | 학술논문

利用湖南省97个台站降水、气温资料和NECP/NCAR再分析资料以及NOAA卫星观测的OLR场资料，系统分析了2013年6月30日至8月14日湖南持续高温干旱的时空分布及同期大气环流异常特征。结果表明：2013年夏季是湖南1951年以来降水最少、高温干旱程度最严重的一年。西太平洋副热带高压强度偏强、西伸脊点偏西，湖南处在副高控制下，盛行下沉气流是发生持续高温干旱的直接原因；西太平洋副高内增强的下沉气流，致使多数县市高温日数和极端高温突破历史同期最高记录。位于菲律宾附近的OLR低值带中心偏西，致使副热带地区下沉区偏西，进而造成西太平洋副高偏强偏西。此外，湖南地区上空为水汽输送异常辐散中心，这在一定程度上促使了干旱的发生发展。
이용호남성97개태참강수、기온자료화NECP/NCAR재분석자료이급NOAA위성관측적OLR장자료，계통분석료2013년6월30일지8월14일호남지속고온간한적시공분포급동기대기배류이상특정。결과표명：2013년하계시호남1951년이래강수최소、고온간한정도최엄중적일년。서태평양부열대고압강도편강、서신척점편서，호남처재부고공제하，성행하침기류시발생지속고온간한적직접원인；서태평양부고내증강적하침기류，치사다수현시고온일수화겁단고온돌파역사동기최고기록。위우비률빈부근적OLR저치대중심편서，치사부열대지구하침구편서，진이조성서태평양부고편강편서。차외，호남지구상공위수기수송이상복산중심，저재일정정도상촉사료간한적발생발전。
Based on daily precipitation and temperature data from 97 meteorological stations in Hu’nan,NCEP/NCAR reanalysis data and the outgoing long-wave radiation (OLR)data provided by NOAA satellite from June to August during 1981 -2013,the temporal and spatial distribution of the persistent and serious high temperature and drought from June 30 to August 14,2013 in Hu’nan and the atmospheric circulation anomalies were analyzed.The results showed that the precipitation in the summer of 2013 was least and high temperature and drought were most serious since 1951.The western Pacific subtropical high was stronger and the position was westward than normal,and the prevailing descending flow over Hu’nan under the control of the western Pacific subtropical high played an impor-tant role to produce the persistent high temperature and drought.The high temperature days and extreme maximum temperature in most counties and cities of Hu’nan broke through the highest record of the same period historically.The position of the low value center of OLR near the Philippines was westward,which caused the descending area of subtropical region toward west,and then resulted in the western Pacific subtropical high was stronger and its position was westward than normal.At the same time,the anomalous divergences of water vapor flux over Hu’nan prompted partly to the development of high temperature and drought.