气候变化领域集成服务门户(CCPortal): Evaluation of an Online Grid-Coarsening Algorithm in a Global Eddy-Admitting Ocean Biogeochemical Model

CCPortal

DOI	10.1029/2019MS001644
	Evaluation of an Online Grid-Coarsening Algorithm in a Global Eddy-Admitting Ocean Biogeochemical Model
	Berthet S.; Séférian R.; Bricaud C.; Chevallier M.; Voldoire A.; Ethé C.
发表日期	2019
ISSN	19422466
起始页码	1759
结束页码	1783
卷号	11 期号:6
英文摘要	In order to explore the effects of mesoscale eddies on marine biogeochemistry over climate timescales, global ocean biogeochemical general circulation models (OBGCMs) need at least to be run at a horizontal resolution of a 0.25°, the minimal resolution admitting eddies. However, their use is currently limited because of a prohibitive computational cost and storage requirements. To overcome this problem, an online coarsening algorithm is evaluated in the oceanic component (NEMO-GELATO-PISCES) of CNRM-ESM2-1. This algorithm allows to compute biogeochemical processes at a coarse resolution (0.75°) while inheriting most of the dynamical characteristics of the eddy-admitting OBGCM (0.25°). Through the coarse-graining process, the effective resolution of the ocean dynamics seen by the biogeochemical model is higher than that which would be obtained from an OBGCM run at 0.75°. In this context, we assess how much the increase from low (1°) to coarse-grained horizontal resolution impacts the ocean dynamics and the marine biogeochemistry over long-term climate simulations. The online coarsening reduces the computational cost by 60% with respect to that of the eddy-admitting OBGCM. In addition, it improves the representation of chlorophyll, nutrients, oxygen, and sea-air carbon fluxes over more than half of the open ocean area compared to the 1° OBGCM. Most importantly, the coarse-grained OBGCM captures the physical-biogeochemical coupling between sea-air carbon fluxes and sea surface height and between oxygen minimum zone boundaries and eddies, as produced by the eddy-admitting OBGCM. Such a cost-efficient coarsening algorithm offers a good trade-off to conduct process-based studies over centennial timescales at higher resolution. ©2019. The Authors.
英文关键词	Earth System modelling; Eddy-admitting resolution; NEMO; Ocean-biogeochemical coupled model; Online coarsening algorithm; PISCES
语种	英语
scopus关键词	Biogeochemistry; Carbon; Climate models; Economic and social effects; Oceanography; Ostwald ripening; Oxygen; Surface waters; Biogeochemical modeling; Coupled modeling; Dynamical characteristics; Earth systems; General circulation model; Marine biogeochemistries; NEMO; PISCES; Coarsening; air-sea interaction; algorithm; biogeochemical cycle; biogeochemistry; climate change; climate modeling; eddy covariance; global change; global ocean; marine environment; mesoscale eddy; open ocean; oxygen minimum layer; sea surface height; timescale
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/156894
作者单位	Centre National de Recherches Météorologiques (CNRM), Université de Toulouse, Météo-France, CNRS, Toulouse, France; Mercator Ocean, Toulouse, France; Institut Pierre-Simon Laplace, Paris, France
推荐引用方式 GB/T 7714	Berthet S.,Séférian R.,Bricaud C.,et al. Evaluation of an Online Grid-Coarsening Algorithm in a Global Eddy-Admitting Ocean Biogeochemical Model[J],2019,11(6).
APA	Berthet S.,Séférian R.,Bricaud C.,Chevallier M.,Voldoire A.,&Ethé C..(2019).Evaluation of an Online Grid-Coarsening Algorithm in a Global Eddy-Admitting Ocean Biogeochemical Model.Journal of Advances in Modeling Earth Systems,11(6).
MLA	Berthet S.,et al."Evaluation of an Online Grid-Coarsening Algorithm in a Global Eddy-Admitting Ocean Biogeochemical Model".Journal of Advances in Modeling Earth Systems 11.6(2019).