期刊
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
卷 111, 期 -, 页码 91-101出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.dsr.2016.02.017
关键词
Foraminifer; Coccoliths; Export; Carbonate counter-pump; Kerguelen Plateau; Southern Ocean
类别
资金
- French research programme of INSU-CNRS LEFE-CYBER (Les enveloppes fluides et l'environnement - Cycles biogeochimiques, environnement et ressources)
- French ANR (Agence Nationale de la Recherche, SIMI-6 programme) [ANR-10-BLAN-0614]
- Institute Polaire Paul Emile Victor (IPEV)
- Unidades de Excelencia Maria de Maeztu (MinECo) [MDM2015-0552]
- [CGL2009-10806]
- ICREA Funding Source: Custom
- Agence Nationale de la Recherche (ANR) [ANR-10-BLAN-0614] Funding Source: Agence Nationale de la Recherche (ANR)
We report the contribution of planktic foraminifers and coccoliths to the particulate inorganic carbon (PIC) export fluxes collected over an annual cycle (October 2011/September 2012) on the central Kerguelen Plateau in the Antarctic Zone (AAZ) south of the Polar Front (PF). The seasonality of PIC flux was decoupled from surface chlorophyll a concentration and particulate organic carbon (POC) fluxes and was characterized by a late summer (February) maximum. This peak was concomitant with the highest satellite-derived sea surface PIC and corresponded to a Emiliania huxleyi coccoliths export event that accounted for 85% of the annual PIC export. The foraminifer contribution to the annual PIC flux was much lower (15%) and dominated by Turborotalita quinqueloba and Neogloboquadrina pachyderma. Foraminifer export fluxes were closely related to the surface chlorophyll a concentration, suggesting food availability as an important factor regulating the foraminifer's biomass. We compared size-normalized test weight (SNW) of the foraminifers with previously published SNW from the Crozet Islands using the same methodology and found no significant difference in SNW between sites for a given species. However, the SNW was significantly species-specific with a threefold increase from T quinqueloba to Globigerina bulloides. The annual PIC:POC molar ratio of 0.07 was close to the mean ratio for the global ocean and lead to a low carbonate counter pump effect (similar to 5%) compared to a previous study north of the PF (6-32%). We suggest that lowers counter pump effect south of the PF despite similar productivity levels is due to a dominance of coccoliths in the PIC fluxes and a difference in the foraminifers species assemblage with a predominance of polar species with lower SNW. (C) 2016 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据