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Effects of the Antarctic elevation on the atmospheric circulation
Theoretical and Applied Climatology ( IF 3.4 ) Pub Date : 2021-01-07 , DOI: 10.1007/s00704-020-03456-1
Kamal Tewari , Saroj K. Mishra , Anupam Dewan , Hisashi Ozawa

The orographic effects of Antarctica on the atmospheric circulation are investigated through idealized orographic reduction numerical experiments performed using the NCAR CAM5 model. The investigation shows that, in the absence of the orography over the continent, the troposphere becomes warmer and wetter, the sea level pressure reduces, and the precipitation is enhanced. Furthermore, over the continent, the height of the tropopause increases, the stationary waves become weaker, and the southern polar jet gets more energetic. The radiative budget also gets altered, with more outgoing longwave radiation over the continent, which drives circulation changes beneath. The mean atmospheric circulation is weakened with weakening and shrinking of the Polar cell and widening of the Ferrel cell in the Southern Hemisphere, which decreases the contribution by mean flow towards poleward energy transport. An increase in transient eddy due to an enhancement of baroclinicity over the region supports poleward energy transport and compensates for a higher outgoing longwave radiation over the Antarctic continent. These significant changes observed in idealized Antarctic orographic reduction demonstrate the importance of the present Antarctic orography and ice cover for the Southern Hemisphere. The impact of these changes provides valuable insights on the future role of Antarctic orography on the earth’s climate system from a fundamental point of view.



中文翻译:

南极海拔对大气环流的影响

通过使用NCAR CAM5模型进行的理想化地形还原数值实验,研究了南极洲对大气环流的地形影响。调查表明,在没有该大陆地形的情况下,对流层变暖和湿润,海平面压力降低,降水增加。此外,在整个大陆上,对流层顶的高度增加,静止波变弱,并且南极射流变得更加活跃。辐射预算也发生了变化,随着大陆上更多的长波辐射向外传播,从而推动了下方的环流变化。随着南半球Polar细胞的减弱和收缩以及Ferrel细胞的扩大,平均大气环流减弱,这减少了平均流量对极地能量传输的贡献。由于该地区气压斜度的增加,瞬态涡流的增加支持了极地能量传输,并补偿了南极大陆上更高的长波辐射。在理想的南极地形缩减中观察到的这些重大变化证明了目前的南极地形和冰盖对南半球的重要性。从基本的角度来看,这些变化的影响为南极地形学在地球气候系统中的未来作用提供了宝贵的见解。由于该地区气压斜度的增加,瞬态涡流的增加支持了极地能量传输,并补偿了南极大陆上更高的长波辐射。在理想的南极地形缩减中观察到的这些重大变化证明了目前的南极地形和冰盖对南半球的重要性。从基本的角度来看,这些变化的影响为南极地形学在地球气候系统中的未来作用提供了宝贵的见解。由于该地区气压斜度的增加,瞬态涡流的增加支持了极地能量传输,并补偿了南极大陆上更高的长波辐射。在理想的南极地形缩减中观察到的这些重大变化证明了目前的南极地形和冰盖对南半球的重要性。从基本的角度来看,这些变化的影响为南极地形学在地球气候系统中的未来作用提供了宝贵的见解。

更新日期:2021-01-07
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