气候变化领域集成服务门户(CCPortal): Changes in the Dust-Influenced Biological Carbon Pump in the Canary Current System: Implications From a Coastal and an Offshore Sediment Trap Record Off Cape Blanc, Mauritania

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DOI	10.1029/2019GB006194
	Changes in the Dust-Influenced Biological Carbon Pump in the Canary Current System: Implications From a Coastal and an Offshore Sediment Trap Record Off Cape Blanc, Mauritania
	Fischer G.; Romero O.; Toby E.; Iversen M.; Donner B.; Mollenhauer G.; Nowald N.; Ruhland G.; Klann M.; Hamady B.; Wefer G.
发表日期	2019
ISSN	0886-6236
EISSN	1944-9224
起始页码	1100
结束页码	1128
卷号	33 期号:8
英文摘要	Long-term data characterizing the oceans' biological carbon pump are essential for understanding impacts of climate variability on marine ecosystems. The “Bakun upwelling intensification hypothesis” suggests intensified coastal upwelling due to a greater land-sea temperature gradient influenced by global warming. We present long time series of bathypelagic (approximately 1,200–3,600 m) particle fluxes from a coastal (CBeu: 2003–2016) and an offshore (CBmeso: 1988–2016) sediment trap setting located in the Canary Current upwelling. Organic carbon (Corg) and biogenic opal (BSi, diatoms) fluxes were twofold to threefold higher at the coastal upwelling site compared to the offshore site, respectively, and showed higher seasonality with flux maxima in spring. A relationship between winter and spring BSi fluxes to the North Atlantic Oscillation index was best expressed at the offshore site CBmeso. Lithogenic (dust) fluxes regularly peaked in winter when frequent low-altitude dust storms and deposition occurred, decreasing offshore by about threefold. We obtained a high temporal match of short-term peaks of BSi and dust fluxes in winter to spring at the inner site CBeu. We found synchronous flux variations at both sites and an anomalous year 2005, characterized by high BSi and Corg fluxes under a low North Atlantic Oscillation. Corg and BSi fluxes revealed a decreasing trend from 2006 to 2016 at the coastal site CBeu, pointing to coastal upwelling relaxation during the last two decades. The permanent offshore upwelling zone of the deflected Canary Current represented by the flux record of CBmeso showed no signs of increasing upwelling as well which contradicts the Bakun hypothesis. ©2019. The Authors.
英文关键词	Canary Current; carbon fluxes; coastal upwelling
语种	英语
scopus关键词	atmospheric deposition; biological pump; carbon flux; coastal sediment; dust; global warming; North Atlantic Oscillation; offshore application; sediment trap; temperature gradient; upwelling; Atlantic Ocean; Canary Current; Cape Blanc; Mauritania; 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/129715
作者单位	Geosciences Department, University of Bremen, Bremen, Germany; MARUM, Center for Marine Environmental Sciences, University of Bremen, Bremen, Germany; Emerita, Department of Statistics, Texas A&M University, College Station, TX, United States; Alfred-Wegener Institute for Polar and Marine Research, Bremerhaven, Germany; IMROP, Institut Mauritanien de Recherches Océanographiques et des Pêches, Nouadhibou, Mauritania
推荐引用方式 GB/T 7714	Fischer G.,Romero O.,Toby E.,et al. Changes in the Dust-Influenced Biological Carbon Pump in the Canary Current System: Implications From a Coastal and an Offshore Sediment Trap Record Off Cape Blanc, Mauritania[J],2019,33(8).
APA	Fischer G..,Romero O..,Toby E..,Iversen M..,Donner B..,...&Wefer G..(2019).Changes in the Dust-Influenced Biological Carbon Pump in the Canary Current System: Implications From a Coastal and an Offshore Sediment Trap Record Off Cape Blanc, Mauritania.Global Biogeochemical Cycles,33(8).
MLA	Fischer G.,et al."Changes in the Dust-Influenced Biological Carbon Pump in the Canary Current System: Implications From a Coastal and an Offshore Sediment Trap Record Off Cape Blanc, Mauritania".Global Biogeochemical Cycles 33.8(2019).