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Varying contributions of fast and slow responses cause asymmetric tropical rainfall change between CO_(2) ramp-up and ramp-down

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Science Bulletin 2022年第16期67卷 1702-1711,M0004页

作者： Shijie Zhou Ping Huang Shang-Ping Xie Gang Huang Lin Wang Center for Monsoon System Research Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100190China State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Scripps Institution of Oceanography University of California San DiegoLa Jolla CA 92093USA Laboratory for Regional Oceanography and Numerical Modeling Pilot National Laboratory for Marine Science and TechnologyQingdao 266237China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China

Tropical rainfall is important for regional climate around the *** a warming climate forced by rising CO_(2),the tropical rainfall will increase over the equatorial Pacific where sea surface warming is locally ***,we analyze an idealized CO_(2) removal experiment from the Carbon Dioxide Removal Model Intercomparison Project(CDRMIP)and show that the tropical rainfall change features a stronger pattern during CO_(2) ramp-down than ramp-up,even under the same global mean temperature increase,such as the 2℃ goal of the Paris *** tropical rainfall during CO_(2) ramp-down increases over the equatorial Pacific with a southward extension,and decreases over the Pacific intertropical convergence zone and South Pacific convergence *** asymmetric rainfall changes between CO_(2) ramp-down and ramp-up result from time-varying contributions of the fast and slow oceanic responses to CO_(2) forcing,defined as the responses to abrupt CO_(2) forcing in the first 10 years and thereafter,respectively,in the abrupt-4xCO_(2) *** fast response follows the CO_(2) evolution,but the slow response does not peak until 60 years after the CO_(2) *** slow response features a stronger El Niño-like pattern,as the ocean dynamical thermostat effect is suppressed under stronger subsurface *** delayed and stronger slow response leads to stronger tropical rainfall changes during CO_(2) *** results indicate that returning the global mean temperature increase to below a certain goal,such as 2℃,by removing CO_(2),may fail to restore tropical convection distribution,with potentially devastating effects on climate worldwide.

关键词： Tropical rainfall fast and slow responses Sea surface warming pattern CDRMIP

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Decomposition of fast and slow Cloud responses to Quadrupled CO_(2)Forcing in BCC–AGCM2.0 over East Asia

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Advances in Atmospheric Sciences 2022年第12期39卷 2188-2202页

作者： Xixun ZHOU Bing XIE Hua ZHANG Jingyi HE Qi CHEN State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesBeijing 100081China University of Chinese Academy of Sciences Beijing 100049China Laboratory for Climate Studies of China Meteorological Administration National Climate CenterBeijing 100081China

In this study,the decomposed fast and slow responses of clouds to an abruptly quadrupled CO_(2)concentration(approximately 1139 ppmv)in East Asia(EA)are obtained quantitatively by using a general circulation model,BCC–*** results show that in the total response,the total cloud cover(TCC),low cloud cover(LCC),and high cloud cover(HCC)all increased north of 40°N and decreased south of 40°N except in the Tibetan Plateau(TP).The mean changes of the TCC,LCC,and HCC in EA were–0.74%,0.38%,and–0.38%in the total response,respectively;1.05%,–0.03%,and 1.63%in the fast response,respectively;and–1.79%,0.41%,and–2.01%in the slow response,*** comparison,we found that changes in cloud cover were dominated by the slow response in most areas in EA due to the changes in atmospheric temperature,circulation,and water vapor supply ***,the changes in the cloud forcing over EA related to the fast and slow responses were opposite to each other,and the final cloud forcing was dominated by the slow *** mean net cloud forcing(NCF)in the total response over EA was–1.80 W m^(–2),indicating a cooling effect which partially offset the warming effect caused by the quadrupled CO_(2).The total responses of NCF in the TP,south China(SC),and northeast China(NE)were–6.74 W m^(–2),6.11 W m^(–2),and–7.49 W m^(–2),***,the local effects of offsetting or amplifying warming were particularly obvious.

关键词： cloud cover cloud forcing quadrupled CO_(2) fast and slow responses

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Distinctive South and East Asian monsoon circulation responses to global warming

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Science Bulletin 2022年第7期67卷 762-770页

作者： Tim Li Yuhao Wang Bin Wang Mingfang Ting Yihui Ding Ying Sun Chao He Guang Yang Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Key Laboratory of Meteorological Disaster Ministry of Education/Joint International Research Laboratory of Climate and Environmental ChangeNanjing University of Information Science and TechnologyNanjing 210044China International Pacifc Research Center and Department of Atmospheric Sciences School of Ocean and Earth Science and TechnologyUniversity of Hawaii at ManoaHonolulu HI 96822USA Lemont-Doherty Earth Observatory Columbia UniversityPalisadesNY 10964USA National Climate Center Beijing 100081China Institute for Environmental and Climate Research Jinan UniversityGuangzhou 511400China

The Asian summer monsoon(ASM)is the most energetic circulation *** its future change is critical for the mitigation and adaptation of billions of people living in the *** are two important components within the ASM:South Asian summer monsoon(SASM)and East Asian summer monsoon(EASM).Although current state-of-the-art climate models projected increased precipitation in both SASM and EASM due to the increase of atmospheric moisture,their circulation changes differ markedlyÐA robust strengthening(weakening)of EASM(SASM)circulation was *** separating fast and slow processes in response to increased CO_(2) radiative forcing,we demonstrate that EASM circulation strengthening is attributed to the fast land warming and associated Tibetan Plateau thermal *** contrast,SASM circulation weakening is primarily attributed to an El Niño-like oceanic warming pattern in the tropical Pacific and associated suppressed precipitation over the Maritime Continent.

关键词： Global warming South and East Asian monsoon circulation changes fast and slow responses Tibetan Plateau Sea surface temperature warming pattern

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