Biomarker Records of Environmental Shifts on the Labrador Shelf During the Holocene
Kolling, Henriette ; Schneider, Ralph ; Gross, Felix ; Hamann, Christian ; Kienast, Markus ; Kienast, Stephanie ; Doering, Kristin LU
; Fahl, Kirsten
and Stein, Ruediger
(2023)
In Paleoceanography and Paleoclimatology
38(9).
- Abstract
The ultimate demise of the Laurentide Ice Sheet (LIS) and the preceding and succeeding oceanographic changes along the western Labrador Sea offer insights critically important to improve climate predictions of expected future climate warming and further melting of the Greenland ice cap. However, while the final disappearance of the LIS during the Holocene is rather well constrained, the response of sea ice during the resulting meltwater events is not fully understood. Here, we present reconstructions of paleoceanographic changes over the past 9.3 Kyr BP on the northwestern Labrador Shelf, with a special focus on the interaction between the final meltwater event around 8.2 Kyr BP and sea ice and phytoplankton productivity (e.g.,... (More)
The ultimate demise of the Laurentide Ice Sheet (LIS) and the preceding and succeeding oceanographic changes along the western Labrador Sea offer insights critically important to improve climate predictions of expected future climate warming and further melting of the Greenland ice cap. However, while the final disappearance of the LIS during the Holocene is rather well constrained, the response of sea ice during the resulting meltwater events is not fully understood. Here, we present reconstructions of paleoceanographic changes over the past 9.3 Kyr BP on the northwestern Labrador Shelf, with a special focus on the interaction between the final meltwater event around 8.2 Kyr BP and sea ice and phytoplankton productivity (e.g., IP25, HBI III (Z), brassicasterol, dinosterol, biogenic opal, total organic carbon). Our records indicate low sea-ice cover and high phytoplankton productivity on the Labrador Shelf prior to 8.9 Kyr BP, sea-ice formation was favored by decreased surface salinities due to the meltwater events from Lake Agassiz-Ojibway and the Hudson Bay Ice Saddle from 8.55 Kyr BP onwards. For the past ca. 7.5 Kyr BP sea ice is mainly transported to the study area by local ocean currents such as the inner Labrador and Baffin Current. Our findings provide new insights into the response of sea ice to increased meltwater discharge as well as shifts in atmospheric and oceanic circulation.
(Less)
- author
- Kolling, Henriette
; Schneider, Ralph
; Gross, Felix
; Hamann, Christian
; Kienast, Markus
; Kienast, Stephanie
; Doering, Kristin
LU
; Fahl, Kirsten
and Stein, Ruediger
- organization
- publishing date
- 2023-09
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- 8.2 event, Atlantic Ocean, IP25, sea ice
- in
- Paleoceanography and Paleoclimatology
- volume
- 38
- issue
- 9
- article number
- e2022PA004578
- publisher
- Wiley-Blackwell
- external identifiers
-
- scopus:85170705567
- ISSN
- 2572-4517
- DOI
- 10.1029/2022PA004578
- language
- English
- LU publication?
- yes
- additional info
- Funding Information: We would like to thank the captain, crew, and the scientific party of the R/V expedition MSM45. We are very thankful to Walter Luttmer for technical support in the biomarker laboratory. Claire Normandeau assisted with the biogenic opal analysis. We acknowledge funding from the Ocean Frontier Institute (OFI) and NSERC. This manuscript benefitted from three anonymous reviewers and the work of the editor. Open Access funding enabled and organized by Projekt DEAL. Maria S. Merian Publisher Copyright: © 2023. The Authors.
- id
- 076b5da1-73b6-42c1-9b93-58710c2b3983
- date added to LUP
- 2023-09-28 19:17:38
- date last changed
- 2023-09-29 14:00:28
@article{076b5da1-73b6-42c1-9b93-58710c2b3983,
abstract = {{<p>The ultimate demise of the Laurentide Ice Sheet (LIS) and the preceding and succeeding oceanographic changes along the western Labrador Sea offer insights critically important to improve climate predictions of expected future climate warming and further melting of the Greenland ice cap. However, while the final disappearance of the LIS during the Holocene is rather well constrained, the response of sea ice during the resulting meltwater events is not fully understood. Here, we present reconstructions of paleoceanographic changes over the past 9.3 Kyr BP on the northwestern Labrador Shelf, with a special focus on the interaction between the final meltwater event around 8.2 Kyr BP and sea ice and phytoplankton productivity (e.g., IP<sub>25</sub>, HBI III (Z), brassicasterol, dinosterol, biogenic opal, total organic carbon). Our records indicate low sea-ice cover and high phytoplankton productivity on the Labrador Shelf prior to 8.9 Kyr BP, sea-ice formation was favored by decreased surface salinities due to the meltwater events from Lake Agassiz-Ojibway and the Hudson Bay Ice Saddle from 8.55 Kyr BP onwards. For the past ca. 7.5 Kyr BP sea ice is mainly transported to the study area by local ocean currents such as the inner Labrador and Baffin Current. Our findings provide new insights into the response of sea ice to increased meltwater discharge as well as shifts in atmospheric and oceanic circulation.</p>}},
author = {{Kolling, Henriette and Schneider, Ralph and Gross, Felix and Hamann, Christian and Kienast, Markus and Kienast, Stephanie and Doering, Kristin and Fahl, Kirsten and Stein, Ruediger}},
issn = {{2572-4517}},
keywords = {{8.2 event; Atlantic Ocean; IP25; sea ice}},
language = {{eng}},
number = {{9}},
publisher = {{Wiley-Blackwell}},
series = {{Paleoceanography and Paleoclimatology}},
title = {{Biomarker Records of Environmental Shifts on the Labrador Shelf During the Holocene}},
url = {{http://dx.doi.org/10.1029/2022PA004578}},
doi = {{10.1029/2022PA004578}},
volume = {{38}},
year = {{2023}},
}