气候变化领域集成服务门户(CCPortal): Advances in reconstructing the AMOC using sea surface observations of salinity

CCPortal

DOI	10.1007/s00382-020-05304-4
	Advances in reconstructing the AMOC using sea surface observations of salinity
	Estella-Perez V.; Mignot J.; Guilyardi E.; Swingedouw D.; Reverdin G.
发表日期	2020
ISSN	0930-7575
起始页码	975
结束页码	992
卷号	55
英文摘要	The Atlantic meridional overturning circulation (AMOC) is one of the main drivers of climate variability at decadal and longer time scales. As there are no direct multi-decadal observations of this key circulation, the reconstruction of past AMOC variations is essential. This work presents a step forward in reconstructing the AMOC using climate models and time-varying surface nudging of salinity and temperature data, for which independent multi-decadal observed series are available. A number of nudging protocols are explored in a perfect model framework to best reproduce the AMOC variability accommodating to the characteristics of SST and SSS available products. As reference SST products with sufficient space and time coverage are available, we here choose to focus on the limitations associated to SSS products with the goal of providing protocols using independent salinity products. We consider a global gridded dataset and, additionally, a coarser SSS dataset restricted to the Atlantic and with a quite low spatial resolution (order of 10 degrees vs. 2 for the model grid). We show how, using the latter, we can improve the efficiency of the nudging on the AMOC reconstruction by adding a high-resolution annual cycle to the coarse resolution SSS product as well as a spatial downscaling to account for SSS gradient. The final protocol retained for the coarse SSS data is able to reconstruct a 100-year long AMOC period (average of 10.18 Sv and a standard deviation of 1.39 Sv), with a correlation of 0.76 to the target and a RMSE of 0.99 Sv. These values can be respectively compared to 0.85 and 0.75 Sv when using the global salinity surface observations. This work provides a first step towards understanding the limitations and prospects of historical AMOC reconstructions using different sea surface salinity datasets for the surface nudging. © 2020, The Author(s).
英文关键词	AMOC; Historical period; Reconstruction; Surface nudging
语种	英语
scopus关键词	climate modeling; climate variation; data set; downscaling; efficiency measurement; meridional circulation; overturn; reconstruction; sea surface salinity; Atlantic Ocean
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/145379
作者单位	LOCEAN-IPSL (Sorbonne Université, CNRS, IRD, MNHN), Paris, France; Universidad Complutense de Madrid, Madrid, Spain; NCAS-Climate, University of Reading, Reading, United Kingdom; Environnements et Paléoenvironnements Océaniques et Continentaux (EPOC), UMR CNRS 5805 EPOC-OASU-Université de Bordeaux, Pessac, France
推荐引用方式 GB/T 7714	Estella-Perez V.,Mignot J.,Guilyardi E.,et al. Advances in reconstructing the AMOC using sea surface observations of salinity[J],2020,55.
APA	Estella-Perez V.,Mignot J.,Guilyardi E.,Swingedouw D.,&Reverdin G..(2020).Advances in reconstructing the AMOC using sea surface observations of salinity.Climate Dynamics,55.
MLA	Estella-Perez V.,et al."Advances in reconstructing the AMOC using sea surface observations of salinity".Climate Dynamics 55(2020).