6810887
doi
10.1016/j.quascirev.2022.107530
oai:zenodo.org:6810887
user-ecotip-arctic
user-eu
Mathiasen, A.M.
Aarhus University
Kristiansen, K.
Aarhus University
Hansen, K.E.
Aarhus University
Wacker, L.
ETH Zürich
Alstrup, A.K.O.
Aarhus University
Munk,O.
Aarhus University
Pearce, C.
Aarhus University
Seidenkrantz, M.-S.
Aarhus University
Holocene ocean conditions off the Zachariae Isstrøm, Northeast Greenland
Davies, J.
Aarhus University
info:eu-repo/semantics/openAccess
Creative Commons Attribution 4.0 International
https://creativecommons.org/licenses/by/4.0/legalcode
Holocene
Paleoceanography
Greenland
Micropaleontology
Foraminifera
Sedimentology
Marine cores
<p>The melting of marine terminating glaciers in Northeast Greenland is a visible sign that our climate is<br>
changing. This melt has been partly attributed to changes in oceanic heat fluxes, particularly warming of<br>
Atlantic Water (AW). Yet our understanding of the interaction between glaciers and the ocean is limited<br>
by the length of instrumental records. Here, we present a multi-proxy study (benthic foraminifera assemblages,<br>
CT scans, grain size, XRF, and stable isotope data) on core DA17-NG-ST08-092G, located 90 km<br>
east of the Northeast Greenland Ice Stream (NEGIS). Whilst the exact timing of deglaciation is uncertain,<br>
it is certain to have occurred at least as early as 12.5 ka cal BP, and likely before 13.4 ka cal BP. The inflow<br>
of AW may have played a role in the seemingly early deglaciation on the Northeast Greenland continental<br>
shelf. Following deglaciation, the site was overlain by an ice shelf, with AWand Polar Water (PW)<br>
flowing beneath until 11.2 ka cal BP. The NEGIS briefly retreated westwards between 11.2 and 10.8 ka cal<br>
BP before our site returned to glacier-proximal conditions dominated by colder subsurface water and<br>
persistent AW flowing beneath (10.8e9.6 ka cal BP). Between 9.6 and 7.9 ka cal BP the NEGIS retreated<br>
westwards; there was a continued presence of AWand PW at the site. A drastic shift in ocean circulation<br>
occurred at 7.9 ka cal BP, with a decline in AW flow and dominance of PW flowing beneath perennial sea<br>
ice. During the Late Holocene, there was return of AW and likely breakup of perennial sea ice.</p>
Zenodo
2022-04-20
info:eu-repo/semantics/article
6810886
user-ecotip-arctic
user-eu
award_title=Arctic biodiversity change and its consequences: Assessing, monitoring and predicting the effects of ecosystem tipping cascades on marine ecosystem services and dependent human systems; award_number=869383; award_identifiers_scheme=url; award_identifiers_identifier=https://cordis.europa.eu/projects/869383; funder_id=00k4n6c32; funder_name=European Commission;
1685001790.154213
5188290
md5:260560480eca1699bf1af5bb28904961
https://zenodo.org/records/6810887/files/Davies et al 2022_QSR_NEG Zachariae.pdf
public
Quaternary Science Reviews
286
107530
2022-04-20