Dissolved neodymium (Nd) isotope compositions and rare earth element (REE) concentrations along with stable oxygen isotope compositions measured on water bottle samples collected during PU2014 to the Barents Sea in 2014

Nearly half the inflow of warm and saline Atlantic Water (AW) to the Arctic Ocean is substantially cooled and freshened in the Barents Sea, which is therefore considered a key region for water mass transformation in the Arctic Mediterranean. Numerous studies have focused on this transformation and t...

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Bibliographic Details
Main Authors: Laukert, Georgi, Makhotin, Mikhail, Petrova, Mariia V, Vesman, Anna, Frank, Martin, Hathorne, Ed C, Bauch, Dorothea, Böning, Philipp, Kassens, Heidemarie, Ivanov, Vladimir
Format: Dataset
Language:English
Published: PANGAEA 2018
Subjects:
Calculated
Cerium
dissolved
Classification
CTD
CTD/Rosette
CTD-RO
Date/Time of event
Density
sigma500
sigma-theta (0)
DEPTH
water
Dysprosium
Elevation of event
Erbium
Europium
Event label
Gadolinium
GEOTRACES
Global marine biogeochemical cycles of trace elements and their isotopes
Holmium
Isotope dilution
Lanthanum
Laptev Sea System
Latitude of event
Longitude of event
LSS
Lutetium
Neodymium
Neodymium-143/Neodymium-144 ratio
standard deviation
Oxygen
Oxygen saturation
pH
Phosphate
Praseodymium
Pressure
Arctic Ocean
Barents Sea
laptev
Laptev Sea
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.895123
https://doi.org/10.1594/PANGAEA.895123
Description
Summary:Nearly half the inflow of warm and saline Atlantic Water (AW) to the Arctic Ocean is substantially cooled and freshened in the Barents Sea, which is therefore considered a key region for water mass transformation in the Arctic Mediterranean. Numerous studies have focused on this transformation and the increasing influence of AW on Arctic climate and biodiversity, yet geochemical investigations of these processes have been scarce. Using the first comprehensive data set of the distributions of dissolved radiogenic neodymium (Nd) isotopes (expressed as ɛNd), rare earth elements (REE) and stable oxygen isotope (δ18O) compositions from this region we are able to constrain the transport and transformation of AW in the Barents Sea and to investigate which processes change the chemical composition of the water masses beyond what is expected from circulation and mixing. Inflowing AW and Norwegian Coastal Water (NCW) both exhibit distinctly unradiogenic ɛNd signatures of -12.4 and -14.5, respectively, whereas cold and dense Polar Water (PW) has considerably more radiogenic ɛNd signatures reaching up to -8.1. Locally formed Barents Sea Atlantic Water (BSAW) and Barents Sea Arctic Atlantic Water (BSAAW) are encountered in the northeastern Barents Sea and have intermediate ɛNd values resulting from admixture of PW containing small amounts of riverine freshwater from the Ob (< ~1.1 %) to AW and NCW. Similar to the Laptev Sea, the dissolved Nd isotope composition in the Barents Sea seems to be mainly controlled by water mass advection and mixing despite its shallow water depth. Strikingly, the BSAW and BSAAW are marked by the lowest REE concentrations reaching 11 pmol/kg for Nd ([Nd]), which in contrast to the Nd isotopes, cannot be attributed to the admixture of REE-rich Ob freshwater to AW or NCW ([Nd] = 16.7, and 22 pmol/kg, respectively) and instead reflects REE removal from the dissolved phase with preferential removal of the light over the heavy REEs. The REE removal is, however, not explainable by estuarine REE ...

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