Cover Image

Driving mechanisms of sedimentary 230Th and 231Pa variability in the Western Arctic Ocean through the last glacial cycle

Concentration profiles of excess 230Th and 231Pa (230Thxs and 231Paxs) in Arctic Ocean sediment cores exhibit strong temporal variabilities, but the mechanisms responsible for the variabilities remain poorly understood. Here, we present new 230Thxs and 231Paxs profiles from the Mendeleev Ridge to ex...

Full description

Saved in:
Bibliographic Details
Main Authors: Xu, Qiang (Author) , Xiao, Wenshen (Author) , Wang, Rujian (Author) , Süfke, Finn (Author) , Lippold, Jörg (Author) , Not, Christelle (Author)
Format: Article (Journal)
Language:English
Published: 10 June 2021
In: Paleoceanography and paleoclimatology
Year: 2021, Volume: 36, Issue: 7, Pages: 1-18
ISSN:2572-4525
DOI:10.1029/2020PA004039
Online Access:lizenzpflichtig
lizenzpflichtig
Get full text
Author Notes:Qian Xu, Wenshen Xiao, Rujian Wang, Finn Süfke, Jörg Lippold, and Christelle Not
Description
Summary:Concentration profiles of excess 230Th and 231Pa (230Thxs and 231Paxs) in Arctic Ocean sediment cores exhibit strong temporal variabilities, but the mechanisms responsible for the variabilities remain poorly understood. Here, we present new 230Thxs and 231Paxs profiles from the Mendeleev Ridge to examine downcore 230Thxs and 231Paxs distributions and their connection to environmental conditions in the Arctic. Measurable concentrations of 230Thxs(231Paxs) from the new record display an alternation of “230Thxs(231Paxs)-rich” and “230Thxs(231Paxs)-poor” sections as observed in the other cores from the Mendeleev Ridge. Sedimentary characteristics reveal that this alternation does not directly correspond to interglacial-glacial cycles. The 230Thxs and 231Paxs concentrations show an inverse relationship to their corresponding sedimentation rates, suggesting the distributions of 230Thxs and 231Paxs are affected by variable dilution with terrigenous material. However, changes in lateral transport of these isotopes may also account for the observed oscillations. Sedimentary cumulative inventories of 230Thxs show evidence for a net deficit of 230Th in the sediments during the last glacial period, possibly due to a lack of scavenging material in general.
Item Description:Gesehen am 29.09.2021
Physical Description:Online Resource
ISSN:2572-4525
DOI:10.1029/2020PA004039

Similar Items