An Soon-Il, Park So-Eun, Shin Jongsoo, Yang Young-Min, Yeh Sang-Wook, Son Seok-Woo, Kug Jong-Seong
Department of Atmospheric Sciences and Irreversible Climate Change Research Center, Yonsei University, Seodaemun-gu, Seoul, 03722, Republic of Korea.
Division of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Republic of Korea.
Sci Rep. 2022 Jul 7;12(1):11569. doi: 10.1038/s41598-022-15905-0.
To investigate the response of the general circulation and global transport of heat through both atmosphere and ocean to two-types of carbon dioxide removal scenario, we performed an earth system model experiment in which we imposed a pulse-type quadrupling of CO forcing for 50 years and a gradual peak-and-decline of four-time CO forcing. We found that the results from two experiments are qualitatively similar to each other. During the forcing-on period, a dominant warming in the upper troposphere over the tropics and on the surface at high latitudes led to a slowdown in the Hadley circulation, but the poleward atmospheric energy transport was enhanced due to an increase in specific humidity. This counteracted the reduction in poleward oceanic energy transport owing to the suppression of the meridional overturning circulation in both Hemispheres. After returning the original CO level, the hemispheric thermal contrast was reversed, causing a southward shift of the intertropical convergence zone. To reduce the hemispheric thermal contrast, the northward energy transports in the atmosphere and ocean surface were enhanced while further weakening of the global-scale Atlantic meridional overturning circulation led to southward energy transport in the deep ocean.
为了研究大气和海洋中热的全球循环和全球输送对两种二氧化碳去除情景的响应，我们进行了一项地球系统模型实验，在实验中我们施加了持续50年的脉冲型四倍二氧化碳强迫以及四倍二氧化碳强迫的逐渐峰值和下降。我们发现两个实验的结果在定性上彼此相似。在强迫期，热带对流层上部和高纬度地区表面的显著变暖导致哈得莱环流减缓，但由于比湿增加，极地大气能量输送增强。这抵消了由于南北半球经向翻转环流受到抑制而导致的极地海洋能量输送的减少。恢复到原始二氧化碳水平后，半球热对比发生逆转，导致热带辐合带向南移动。为了降低半球热对比，大气和海洋表面向北的能量输送增强，而全球尺度大西洋经向翻转环流的进一步减弱导致深海向南的能量输送。
