The climate in polar regions has experienced an obvious warming amplification due to global warming.In this study,the changes in polar amplification are analyzed in response to feedback mechanisms(including Planck,lap...The climate in polar regions has experienced an obvious warming amplification due to global warming.In this study,the changes in polar amplification are analyzed in response to feedback mechanisms(including Planck,lapse rate,cloud,water vapor,albedo feedback,CO_(2) radiative forcing,ocean heat uptake,and atmospheric heat transport)under three warming scenarios in CMIP6—namely,SSP1-2.6,SSP2-4.5,and SSP5-8.5.The results show that,by quantifying the warming contribution of different feedback mechanisms to surface air temperature with the“radiative kernel”method,Arctic amplification(AA)is stronger than Antarctic amplification(ANA),mostly resulting from the lapse rate feedback,followed by the albedo and Planck feedbacks.Furthermore,ocean heat uptake causes stronger polar warming in winter than in summer.During winter,the lapse rate feedback causes a larger AA than ANA.The intermodel spread for both AA and ANA decrease with increasing strength of global warming from SSP1-2.6 to SSP5-8.5,and the dominant mechanisms are the Planck,lapse rate,albedo,and ocean heat uptake feedbacks.These findings help to enhance our understanding of polar regions’responses to different strengths of global warming.展开更多
基金This work was supported by the National Natural Science Foundation of China[grant number 41420104002]the Natural Science Foundation of Jiangsu Province[grant numbers BK20150907 and 14KJA170002].
文摘The climate in polar regions has experienced an obvious warming amplification due to global warming.In this study,the changes in polar amplification are analyzed in response to feedback mechanisms(including Planck,lapse rate,cloud,water vapor,albedo feedback,CO_(2) radiative forcing,ocean heat uptake,and atmospheric heat transport)under three warming scenarios in CMIP6—namely,SSP1-2.6,SSP2-4.5,and SSP5-8.5.The results show that,by quantifying the warming contribution of different feedback mechanisms to surface air temperature with the“radiative kernel”method,Arctic amplification(AA)is stronger than Antarctic amplification(ANA),mostly resulting from the lapse rate feedback,followed by the albedo and Planck feedbacks.Furthermore,ocean heat uptake causes stronger polar warming in winter than in summer.During winter,the lapse rate feedback causes a larger AA than ANA.The intermodel spread for both AA and ANA decrease with increasing strength of global warming from SSP1-2.6 to SSP5-8.5,and the dominant mechanisms are the Planck,lapse rate,albedo,and ocean heat uptake feedbacks.These findings help to enhance our understanding of polar regions’responses to different strengths of global warming.
