气候变化领域集成服务门户(CCPortal): Increased Climate Response and Earth System Sensitivity From CCSM4 to CESM2 in Mid-Pliocene Simulations

CCPortal

DOI	10.1029/2019MS002033
	Increased Climate Response and Earth System Sensitivity From CCSM4 to CESM2 in Mid-Pliocene Simulations
	Feng R.; Otto-Bliesner B.L.; Brady E.C.; Rosenbloom N.
发表日期	2020
ISSN	19422466
卷号	12 期号:8
英文摘要	Three new equilibrium mid-Pliocene (MP) simulations are implemented with the Community Climate System Model version 4 (CCSM4) and Community Earth System Model versions 1.2 (CESM1.2) and 2 (CESM2). All simulations are carried out with the same boundary and forcing conditions following the protocol of Pliocene Model Intercomparison Project Phase 2 (PlioMIP2). These simulations reveal amplified MP climate change relative to the preindustrial going from CCSM4 to CESM2, seen in global and polar averages of surface warming, sea ice reduction in both the Arctic and the Antarctic, and weakened Hadley circulation. The enhanced global mean warming arises from enhanced Earth system sensitivity (ESS) to not only CO2 change but also changes in boundary conditions primarily from vegetation and ice sheets. ESS is amplified by up to 70% in CCSM4 and up to 100% in CESM1.2 and CESM2 relative to the equilibrium climate sensitivity of respective models. Simulations disagree on several climate metrics. Different from CCSM4, both CESM1.2 and CESM2 show reduction of cloud cover, and weakened Walker circulation accompanied by an El Niño-like mean state of the tropical Pacific in MP simulations relative to the preindustrial. This El Niño-like mean state is consistent with paleo-observational sea surface temperatures, suggesting an improvement upon CCSM4. The performances of MP simulations are assessed with a new compilation of observational MP sea surface temperature. The model-data comparison suggests that CCSM4 is not sensitivity enough to the MP forcings, but CESM2 is likely too sensitive, especially in the tropics. © 2020. The Authors.
英文关键词	AMOC; Earth System Sensitivity; mid-Pliocene; PlioMIP2; PMIP4; tropical circulation
语种	英语
scopus关键词	Atmospheric temperature; Climate change; Oceanography; Sea ice; Submarine geophysics; Surface properties; Surface waters; Tropics; Climate sensitivity; Community climate system model; Earth system model; Global mean warming; Hadley circulation; Model inter comparisons; Model-data comparisons; Sea surface temperature (SST); Climate models; atmospheric circulation; climate change; climate forcing; climate modeling; cloud cover; El Nino; ice sheet; Pliocene; sea ice; sea surface temperature; simulation; Walker circulation; Arctic and Antarctic; Pacific Ocean; Pacific Ocean (Tropical)
来源期刊	Journal of Advances in Modeling Earth Systems
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156663
作者单位	Department of Geosciences, University of Connecticut, Storrs, CT, United States; National Center for Atmospheric Research, Boulder, CO, United States
推荐引用方式 GB/T 7714	Feng R.,Otto-Bliesner B.L.,Brady E.C.,et al. Increased Climate Response and Earth System Sensitivity From CCSM4 to CESM2 in Mid-Pliocene Simulations[J],2020,12(8).
APA	Feng R.,Otto-Bliesner B.L.,Brady E.C.,&Rosenbloom N..(2020).Increased Climate Response and Earth System Sensitivity From CCSM4 to CESM2 in Mid-Pliocene Simulations.Journal of Advances in Modeling Earth Systems,12(8).
MLA	Feng R.,et al."Increased Climate Response and Earth System Sensitivity From CCSM4 to CESM2 in Mid-Pliocene Simulations".Journal of Advances in Modeling Earth Systems 12.8(2020).