CAJ | 학술논문

利用NCEP／NCAR再分析逐日500 hPa高度场资料，对北半球夏季中高纬度大气阻塞特征进行统计分析，发现大气阻塞活动频率高的地区主要集中在白令海峡区域、鄂霍次克海区域、欧亚大陆区域及格陵兰区域。而通过NSIDC提供的卫星观测资料发现近30年夏季海冰容易减少的区域正好对应阻塞活动北部的高纬度地区。分别通过对以上4个区域有阻塞发生相对没有阻塞发生时的500 hPa位势高度场、地面温度场、850 hPa经向瞬变热通量输送和平流输送等异常变化场进行对比分析，结果发现夏季中高纬度阻塞频率的增加对海冰的减少有显著影响，主要体现在阻塞的发生发展可通过增加高纬度地面温度、对极地的热量输送和暖平流输送来加快海冰的融化。这种阻塞引起的热力作用在鄂霍次克海和欧亚大陆区域效果更为显著。
이용NCEP／NCAR재분석축일500 hPa고도장자료，대북반구하계중고위도대기조새특정진행통계분석，발현대기조새활동빈솔고적지구주요집중재백령해협구역、악곽차극해구역、구아대륙구역급격릉란구역。이통과NSIDC제공적위성관측자료발현근30년하계해빙용역감소적구역정호대응조새활동북부적고위도지구。분별통과대이상4개구역유조새발생상대몰유조새발생시적500 hPa위세고도장、지면온도장、850 hPa경향순변열통량수송화평류수송등이상변화장진행대비분석，결과발현하계중고위도조새빈솔적증가대해빙적감소유현저영향，주요체현재조새적발생발전가통과증가고위도지면온도、대겁지적열량수송화난평류수송래가쾌해빙적융화。저충조새인기적열력작용재악곽차극해화구아대륙구역효과경위현저。
The relationship between mid-high latitude blocking in the northern hemisphere and the decline in Arctic sum-mer sea ice was investigated using National Centers for Environmental Prediction /National Center for Atmospheric Research daily 500 hPa geopotential height reanalysis data .Results show that there are high blocking frequencies o-ver the Bering Strait , the Okhotsk Sea , Eurasia , and Greenland , which correlate closely with the areas of reduced Arctic summer sea ice in the past 30 years as observed from satellite data .Differences in surface temperature , me-ridional heat transport and temperature advection in 850 hPa anomaly fields between days with and without blocking were calculated and the results show that mid-high latitude blocking has a significant impact on the reduction in sea ice.An increase in blocking frequency in northern hemisphere mid-high latitudes will increase the surface air tem-perature , poleward heat transport , and temperature advection , further accelerate the melting of Arctic sea ice . Therefore, thermodynamic effects caused by blocking over the Okhotsk Sea and Eurasia could result in a marked re -duction in Arctic sea ice .