气候变化领域集成服务门户(CCPortal): Possible impacts of anthropogenic climate change to the upwelling in the South Brazil Bight

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DOI	10.1007/s00382-020-05289-0
	Possible impacts of anthropogenic climate change to the upwelling in the South Brazil Bight
	de Souza M.M.; Mathis M.; Mayer B.; Noernberg M.A.; Pohlmann T.
发表日期	2020
ISSN	0930-7575
起始页码	651
结束页码	664
卷号	55
英文摘要	Anthropogenic climate change is expected to strengthen upwelling events worldwide, driven by an increase of upwelling-favorable winds. However, Earth System Models (ESM) tend to underestimate regional processes due to their coarse grid resolution, which can lead to local biases. We use a high-resolution ocean model (1 / 12 ∘) forced by results from the Max-Planck-Institute-ESM to analyze the impact of the RCP8.5 emission scenario on the upwelling of South Atlantic Central Water (SACW) in the South Brazil Bight (SBB). We find a stronger Ekman forcing and a higher spread of SACW over the shelf, but this does not translate into higher vertical velocities at the bottom of the mixed-layer in the end of the century. The increased winds’ effect is essentially balanced by an increase in water column stability due to the surface warming. This is particularly important during austral summer, when this process tends to weaken the upwelling. Vertical velocities decrease significantly along the shelf break. Here, the upwelling regime is governed by the Brazil Current (BC) and slight changes in transport induce large responses in upwelling strength. The consequences are increased sea surface temperatures over most of the shelf, although mitigated by the SACW upwelling and kept below global projections. However, temperatures decrease along Cabo Frio. In this region, shelf break upwelling dominates and is enhanced by a local increase in the BC transport. This highlights the importance of regional processes and, more specifically, of changes in the BC transport for the upwelling in the SBB. © 2020, The Author(s).
英文关键词	Brazil current; Ekman transport; HAMSOM; Potential vorticity; RCP8.5
语种	英语
scopus关键词	anthropogenic effect; climate change; climate effect; Ekman transport; mixed layer; sea surface temperature; shelf break; upwelling; wind field; Atlantic Ocean; Brazil; Brazil Current; Cabo Frio; Rio de Janeiro [Brazil]; South Brazil Bight
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/145386
作者单位	Institut für Meereskunde, Universität Hamburg, Hamburg, Germany; Helmholtz-Zentrum Geesthacht, Geesthacht, Germany; Centro de Estudos do Mar-UFPR, Pontal do Paraná, Brazil
推荐引用方式 GB/T 7714	de Souza M.M.,Mathis M.,Mayer B.,et al. Possible impacts of anthropogenic climate change to the upwelling in the South Brazil Bight[J],2020,55.
APA	de Souza M.M.,Mathis M.,Mayer B.,Noernberg M.A.,&Pohlmann T..(2020).Possible impacts of anthropogenic climate change to the upwelling in the South Brazil Bight.Climate Dynamics,55.
MLA	de Souza M.M.,et al."Possible impacts of anthropogenic climate change to the upwelling in the South Brazil Bight".Climate Dynamics 55(2020).