气候变化领域集成服务门户(CCPortal): Linking ITCZ migrations to the AMOC and North Atlantic/Pacific SST decadal variability

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DOI	10.1175/JCLI-D-19-0258.1
	Linking ITCZ migrations to the AMOC and North Atlantic/Pacific SST decadal variability
	Moreno-Chamarro E.; Marshall J.; Delworth T.L.
发表日期	2020
ISSN	0894-8755
起始页码	893
结束页码	905
卷号	33 期号:3
英文摘要	We examine the link between migrations in the intertropical convergence zone (ITCZ) and changes in the Atlantic meridional overturning circulation (AMOC), Atlantic multidecadal variability (AMV), and Pacific decadal oscillation (PDO). We use a coupled climate model that allows us to integrate over climate noise and assess underlying mechanisms. We use an ensemble of ten 300-yr-long simulations forced by a 50-yr oscillatory North Atlantic Oscillation (NAO)-derived surface heat flux anomaly in the North Atlantic, and a 4000-yr-long preindustrial control simulation performed with GFDL CM2.1. In both setups, an AMV phase change induced by a change in the AMOC's cross-equatorial heat transport forces an atmospheric interhemispheric energy imbalance that is compensated by a change in the cross-equatorial atmospheric heat transport due to a meridional ITCZ shift. Such linkages occur on decadal time scales in the ensemble driven by the imposed forcing, and internally on multicentennial time scales in the control. Regional precipitation anomalies differ between the ensemble and the control for a zonally averaged ITCZ shift of similar magnitude, which suggests a dependence on time scale. Our study supports observational evidence of an AMV-ITCZ link in the twentieth century and further links it to the AMOC, whose long-time-scale variability can influence the phasing of ITCZ migrations. In contrast to the AMV, our calculations suggest that the PDO does not drive ITCZ migrations, because the PDO does not modulate the interhemispheric energy balance. © 2019 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).
英文关键词	Atmospheric movements; Atmospheric pressure; Climate models; Heat flux; Heat transfer; Time measurement; Atlantic meridional overturning circulations; Coupled climate model; Intertropical convergence zone; Multidecadal variability; North Atlantic oscillations; Pacific decadal oscillation; Precipitation anomalies; Surface heat fluxes; Oceanography; Atlantic Multidecadal Oscillation; climate modeling; climate variation; decadal variation; intertropical convergence zone; meridional circulation; North Atlantic Oscillation; Pacific Decadal Oscillation; precipitation (climatology); sea surface temperature; Atlantic Ocean; Atlantic Ocean (North)
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171469
作者单位	Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, United States; NOAA/Geophysical Fluid Dynamics Laboratory, Princeton, NJ, United States
推荐引用方式 GB/T 7714	Moreno-Chamarro E.,Marshall J.,Delworth T.L.. Linking ITCZ migrations to the AMOC and North Atlantic/Pacific SST decadal variability[J],2020,33(3).
APA	Moreno-Chamarro E.,Marshall J.,&Delworth T.L..(2020).Linking ITCZ migrations to the AMOC and North Atlantic/Pacific SST decadal variability.Journal of Climate,33(3).
MLA	Moreno-Chamarro E.,et al."Linking ITCZ migrations to the AMOC and North Atlantic/Pacific SST decadal variability".Journal of Climate 33.3(2020).