CAJ | 학술논문

利用一个新的陆-气双向耦合模式R42_AVIM,通过有无植被覆盖的埘比试验分析,探讨了全球植被分布对气候和大气环流产生的潜在影响.得出:陆面植被覆盖使得地表特征参数发生行星尺度的明显改变,在叶面积指数大的热带和中高纬度森林带尤其显著.在现实植被分布下,陆地表面反照率减小,地表净辐射收支和地表潜热通量增加,而地表感热通量减小.植被叶面积指数比较大的区域地表温度降低,并且这种温度的改变一直延伸到对流层中上层,在热带表现为斜压结构,而在中高纬表现为相当正压结构.植被的存在使热带和中高纬度森林带的蒸发和相应的高层凝结潜热加热增强,从而增强了经罔环流的上升支,使得冬季在热带和南半球中纬度降水增多,夏季在热带和北半球中高纬地区降水明显增多;而经圈环流下沉支的增强致使副热带降水减少且更干旱.同时,植被的存在使大陆潜热释放增强,气温下降,减小了海陆温度对比,亚洲夏季风也有所减弱.
이용일개신적륙-기쌍향우합모식R42_AVIM,통과유무식피복개적시비시험분석,탐토료전구식피분포대기후화대기배유산생적잠재영향.득출:륙면식피복개사득지표특정삼수발생행성척도적명현개변,재협면적지수대적열대화중고위도삼림대우기현저.재현실식피분포하,륙지표면반조솔감소,지표정복사수지화지표잠열통량증가,이지표감열통량감소.식피협면적지수비교대적구역지표온도강저,병차저충온도적개변일직연신도대류층중상층,재열대표현위사압결구,이재중고위표현위상당정압결구.식피적존재사열대화중고위도삼림대적증발화상응적고층응결잠열가열증강,종이증강료경망배류적상승지,사득동계재열대화남반구중위도강수증다,하계재열대화북반구중고위지구강수명현증다;이경권배류하침지적증강치사부열대강수감소차경간한.동시,식피적존재사대륙잠열석방증강,기온하강,감소료해륙온도대비,아주하계풍야유소감약.
The authors adopt a new two-way land-atmosphere coupled model R42_AVIM.By contrast of experiments with and without vegetation cover,the possible impact of global vegetation distribution on climate and atmosphere circulation is discussed.The results show that the actual vegetation coverage on land can alter the surface characteristic parameters obviously on planetary scale,especially for tropical rainforest and boreal forest Under the distribution of actual vegetation,the surface net radiation and the latent heat flux will increase,while the surface sensible heat flux will decrease.In the areas where the leaf area index(LAI)is relatively large,the surface temperature will decrease.Moreover,this effect can also extend to the middle and upper troposphere.In addition,the present vegetation distribution enhances the evaporation as well as the corresponding condensation latent heating in the tropics and mid-high latitudes,which makes the meridional circulation stronger.And then,the precipitation increases in the tropics and mid-high latitudes,while decreases in the subtropics.Meanwhile,vegetation can also reduce the sealand temperature contrast and weaken the Asian summer monsoon.