气候变化领域集成服务门户(CCPortal): The Fate of Carbon and Nutrients Exported Out of the Southern Ocean

CCPortal

DOI	10.1029/2018GB005977
	The Fate of Carbon and Nutrients Exported Out of the Southern Ocean
	Hauck J.; Lenton A.; Langlais C.; Matear R.
发表日期	2018
ISSN	0886-6236
EISSN	1944-9224
起始页码	1556
结束页码	1573
卷号	32 期号:10
英文摘要	Southern Ocean (SO) nutrient export via mode and intermediate waters is known to affect global biological production. The accompanying effects on the CO2 flux outside the SO are less certain. We performed idealized model simulations to separate the transient effects of SO carbon pumps on nutrients, primary production, and CO2 flux outside the SO. The SO biological carbon pump leads to dissolved inorganic carbon and nutrient reduction at the surface and in the exported water masses, and to a dissolved inorganic carbon increase at depth through the sinking of organic matter. When primary production is suppressed in the SO, only 30% of SO export, 43% of SO net primary production, and 50% of biologically driven SO CO2 flux are compensated outside the SO on a 200-year time scale. In contrast, when the abiotically driven CO2 flux is suppressed, 90% of CO2 outgassing in the SO is compensated by air-sea CO2 exchange outside the SO. The longer sequestration time scale of the biological carbon pump can be explained by incomplete compensation of primary production. This is a result of almost complete compensation of diatom productivity and no compensation of nanophytoplankton productivity due to feedbacks in phytoplankton community composition. The longer sequestration time scale is further sustained by the sinking and remineralization of particles in the deep ocean that are not in contact with the atmosphere over the 200-year time scale considered. As SO biologically driven CO2 flux is only partly compensated outside the SO, potential future changes in SO productivity may have an important impact on the global carbon cycle. ©2018. The Authors.
英文关键词	global carbon cycle; mode and intermediate waters; nutrient export; ocean carbon sink; Southern Ocean
语种	英语
scopus关键词	air-sea interaction; biological pump; carbon cycle; carbon flux; carbon sequestration; carbon sink; community composition; dissolved inorganic carbon; intermediate water; mode water; nanoplankton; nutrient dynamics; phytoplankton; primary production; Southern Ocean; Bacillariophyta
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129781
作者单位	Alfred Wegener Institut, Helmholtz Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany; CSIRO Oceans and Atmosphere, Hobart, TAS, Australia; Centre for Southern Hemisphere Oceans Research, Hobart, TAS, Australia; Antarctic Climate and Ecosystems Cooperative Research Centre, Hobart, TAS, Australia
推荐引用方式 GB/T 7714	Hauck J.,Lenton A.,Langlais C.,et al. The Fate of Carbon and Nutrients Exported Out of the Southern Ocean[J],2018,32(10).
APA	Hauck J.,Lenton A.,Langlais C.,&Matear R..(2018).The Fate of Carbon and Nutrients Exported Out of the Southern Ocean.Global Biogeochemical Cycles,32(10).
MLA	Hauck J.,et al."The Fate of Carbon and Nutrients Exported Out of the Southern Ocean".Global Biogeochemical Cycles 32.10(2018).