气候变化领域集成服务门户(CCPortal): Southern Ocean circulation's impact on atmospheric CO2 concentration

CCPortal

DOI	10.3389/fmars.2023.1328534
	Southern Ocean circulation's impact on atmospheric CO2 concentration
	Menviel, Laurie; Spence, Paul
发表日期	2024
EISSN	2296-7745
起始页码	10
卷号	10
英文摘要	In the context of past and present climate change, the Southern Ocean (SO) has been identified as a crucial region modulating the concentration of atmospheric CO2. The sustained upwelling of carbon-rich deep waters and inefficient nutrient utilization at the surface of the SO leads to an outgassing of natural CO2, while anthropogenic CO2 is entrained to depth during the formation of Antarctic Bottom water (AABW), Antarctic intermediate water (AAIW) and sub-Antarctic mode water (SAMW). Changes to the SO circulation resulting from both dynamic and buoyancy forcing can alter the rate of upwelling as well as formation and subsequent transport of AABW, AAIW and SAMW, thus impacting the air-sea CO2 exchange in the SO. Models of all complexity robustly show that stronger southern hemispheric (SH) westerlies enhance SO upwelling, thus leading to stronger natural CO2 outgassing, with a sensitivity of 0.13 GtC/yr for a 10% increase in SH westerly windstress. While the impact of changes in the position of the SH westerly winds was previously unclear, recent simulations with high-resolution ocean/sea-ice/carbon cycle models show that a poleward shift of the SH westerlies also enhances natural CO2 outgassing with a sensitivity of 0.08GtC/yr for a 5 degrees poleward shift. While enhanced AABW transport reduces deep ocean natural DIC concentration and increases surface natural DIC concentration, it acts on a multi-decadal timescale. Future work should better constrain both the natural and anthropogenic carbon cycle response to changes in AABW and the compound impacts of dynamic and buoyancy changes on the SO marine carbon cycle.
英文关键词	Southern Ocean; carbon cycle; atmospheric CO2; Antarctic Bottom Water (AABW); Southern hemisphere westerlies
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Marine & Freshwater Biology
WOS类目	Environmental Sciences ; Marine & Freshwater Biology
WOS记录号	WOS:001154984700001
来源期刊	FRONTIERS IN MARINE SCIENCE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/289037
作者单位	University of New South Wales Sydney; University of Tasmania; University of Tasmania; University of Tasmania
推荐引用方式 GB/T 7714	Menviel, Laurie,Spence, Paul. Southern Ocean circulation's impact on atmospheric CO2 concentration[J],2024,10.
APA	Menviel, Laurie,&Spence, Paul.(2024).Southern Ocean circulation's impact on atmospheric CO2 concentration.FRONTIERS IN MARINE SCIENCE,10.
MLA	Menviel, Laurie,et al."Southern Ocean circulation's impact on atmospheric CO2 concentration".FRONTIERS IN MARINE SCIENCE 10(2024).