CAJ | 학술논문

利用1980-2009年NCEP／NCAR月平均再分析资料，研究了在全球变暖背景下北半球对流层大气涡动减弱现象。结果表明：北半球涡度拟能30a来整体呈减弱趋势，在北太平洋地区和极地减弱尤为显著，12．5～50°N为影响北半球大气涡动变化的关键区域。由于对流层200hPa以下大气的增暖，特别是中高纬地区显著增暖，减弱了经向温度梯度，使得副热带西风急流的强度亦呈减弱趋势。这与涡度拟能的变化有显著的正相关关系。分析了北半球正压Rossby波动诊断量E和热量经向涡动通量的变化，表明中纬度波能传播在不同地区有不同趋势，而热量的经向涡动输送与涡度拟能的变化也呈现显著的正相关关系，减弱明显。研究结果对深刻认识大气环流变化规律和理解全球变暖的可能影响具有重要意义。
이용1980-2009년NCEP／NCAR월평균재분석자료，연구료재전구변난배경하북반구대류층대기와동감약현상。결과표명：북반구와도의능30a래정체정감약추세，재북태평양지구화겁지감약우위현저，12．5～50°N위영향북반구대기와동변화적관건구역。유우대류층200hPa이하대기적증난，특별시중고위지구현저증난，감약료경향온도제도，사득부열대서풍급류적강도역정감약추세。저여와도의능적변화유현저적정상관관계。분석료북반구정압Rossby파동진단량E화열량경향와동통량적변화，표명중위도파능전파재불동지구유불동추세，이열량적경향와동수송여와도의능적변화야정현현저적정상관관계，감약명현。연구결과대심각인식대기배류변화규률화리해전구변난적가능영향구유중요의의。
Using the NCEP/NCAR monthly mean reanalysis data from 1980 to 2009, this paper investi gates the weakening trends of enstrophy in troposphere of Northern Hemisphere under background of global warming. Results show that the enstrophy has a weakening trend in the Northern Hemisphere from 1980 to 2009 ,especially in the North Pacific and polar regions. The zone of 12.550~N is the key area of enstrophy change in the Northen Hemiphere. Changes of the subtropical westerly jet in asso ciation with the meridional gradient of air temperature show that the jet intensity has a weakening trend, which is in accordance with the enstrophy change. A vector E is employed to diagnose the Rossby wave propagations in the atmosphere, showing that the disturbances in the atmosphere elongate more meridio nal in the Northern Hemisphere except western Europe. The meridional eddy heat fluxes in the Northen Hemiphere have also been weakening in the past 30 years. These results are helpful for our better under standing the circulation changes and the influences of global warning.