中文版 | English
Title

Dissolved, Labile, and Total Particulate Trace Metal Dynamics on the Northeast Greenland Shelf

Author
Corresponding AuthorChen, Xue-Gang; Achterberg, Eric P.
Publication Years
2022-12-01
DOI
Source Title
ISSN
0886-6236
EISSN
1944-9224
Volume36Issue:12
Abstract
["We present high-resolution profiles of dissolved, labile, and total particulate trace metals (TMs) on the Northeast Greenland shelf from GEOTRACES cruise GN05 in August 2016. Combined with radium isotopes, stable oxygen isotopes, and noble gas measurements, elemental distributions suggest that TM dynamics were mainly regulated by the mixing between North Atlantic-derived Intermediate Water, enriched in labile particulate TMs (LpTMs), and Arctic surface waters, enriched in Siberian shelf-derived dissolved TMs (dTMs; Co, Cu, Fe, Mn, and Ni) carried by the Transpolar Drift. These two distinct sources were delineated by salinity-dependent variations of dTM and LpTM concentrations and the proportion of dTMs relative to the total dissolved and labile particulate ratios. Locally produced meltwater from the Nioghalvfjerdsbrae (79NG) glacier cavity, distinguished from other freshwater sources using helium excess, contributed a large pool of dTMs to the shelf inventory. Localized peaks in labile and total particulate Cd, Co, Fe, Mn, Ni, Cu, Al, V, and Ti in the cavity outflow, however, were not directly contributed by submarine melting. Instead, these particulate TMs were mainly supplied by the re-suspension of cavity sediment particles. Currently, Arctic Ocean outflows are the most important source of dFe, dCu, and dNi on the shelf, while LpTMs and up to 60% of dMn and dCo are mainly supplied by subglacial discharge from the 79NG cavity. Therefore, changes in the cavity-overturning dynamics of 79NG induced by glacial retreat, and alterations in the transport of Siberian shelf-derived materials with the Transport Drift may shift the shelf dTM-LpTM stoichiometry in the future.","Plain Language Summary Trace metals (TMs) including cobalt (Co), iron (Fe), manganese (Mn), copper (Cu), and nickel (Ni) are essential micronutrients for marine productivity. The Northeast Greenland shelf is a climatically sensitive region, influenced by both outflowing Arctic waters and local glacier melting. We lack knowledge on how these Arctic surface waters affect TM dynamics on the Greenland shelf and how climatic shifts may influence TM dynamics. Here, we distinguish local submarine meltwater from Arctic surface waters using distinct tracers; noble gases and radium isotopes. We show that the TM dynamics on the shelf are largely controlled by the intrusion of Arctic surface waters which creates a near-surface plume of dissolved and labile particulate TMs. Conversely, submarine meltwater creates a subsurface plume enriched in dissolved TMs but depleted in particulate TMs, which is exported from underneath a floating ice tongue. In the future, increasing Arctic river discharge and local glacial melting may both significantly change shelf micronutrient ratios demonstrating downstream impacts of a changing cryosphere on marine biogeochemical cycles."]
Keywords
URL[Source Record]
Indexed By
Language
English
SUSTech Authorship
Others
Funding Project
Deutsche Forschungsgemeinschaft[AC 217/1-1] ; DFG[HO 6321/1-1]
WOS Research Area
Environmental Sciences & Ecology ; Geology ; Meteorology & Atmospheric Sciences
WOS Subject
Environmental Sciences ; Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences
WOS Accession No
WOS:000924596500001
Publisher
ESI Research Field
GEOSCIENCES
Data Source
Web of Science
Citation statistics
Cited Times [WOS]:0
Document TypeJournal Article
Identifierhttp://kc.sustech.edu.cn/handle/2SGJ60CL/479609
DepartmentDepartment of Ocean Science and Engineering
Affiliation
1.Zhejiang Univ, Ocean Coll, Zhoushan, Peoples R China
2.GEOMAR Helmholtz Ctr Ocean Res Kiel, Kiel, Germany
3.Bundesanstalt Gewasserkunde, Koblenz, Germany
4.Southern Univ Sci & Technol, Dept Ocean Sci & Engn, Shenzhen, Peoples R China
5.Helmholtz Ctr Polar & Marine Res, Alfred Wegener Inst, Bremerhaven, Germany
6.Univ Bremen, IUP Inst Environm Phys, Bremen, Germany
7.Univ Lleida AGROTECNIO CERCA, Dept Chem, Lleida, Spain
Recommended Citation
GB/T 7714
Chen, Xue-Gang,Krisch, Stephan,Al-Hashem, Ali,et al. Dissolved, Labile, and Total Particulate Trace Metal Dynamics on the Northeast Greenland Shelf[J]. GLOBAL BIOGEOCHEMICAL CYCLES,2022,36(12).
APA
Chen, Xue-Gang.,Krisch, Stephan.,Al-Hashem, Ali.,Hopwood, Mark James.,van der Loeff, Michiel M. Rutgers.,...&Achterberg, Eric P..(2022).Dissolved, Labile, and Total Particulate Trace Metal Dynamics on the Northeast Greenland Shelf.GLOBAL BIOGEOCHEMICAL CYCLES,36(12).
MLA
Chen, Xue-Gang,et al."Dissolved, Labile, and Total Particulate Trace Metal Dynamics on the Northeast Greenland Shelf".GLOBAL BIOGEOCHEMICAL CYCLES 36.12(2022).
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