Postglacial environmental succession of Nettilling Lake (Baffin Island, Canadian Arctic) focusing on paleo-salinity changes inferred from diatom silica (δ18Odiatom).
The need for better understanding of long-term climate and environmental variability in the Foxe Basin (Nunavut, Canada) is highlighted by the major environmental changes in this highly sensitive region, which occupies a transitional position between areas undergoing drastic and more subtle changes...
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ftawi:oai:epic.awi.de:42236 2023-05-15T14:22:16+02:00 Postglacial environmental succession of Nettilling Lake (Baffin Island, Canadian Arctic) focusing on paleo-salinity changes inferred from diatom silica (δ18Odiatom). Meyer, Hanno Narancic, Biljana Chapligin, Bernhard Pienitz, Reinhard 2016-05 https://epic.awi.de/id/eprint/42236/ https://hdl.handle.net/10013/epic.48959 unknown Meyer, H. orcid:0000-0003-4129-4706 , Narancic, B. , Chapligin, B. and Pienitz, R. (2016) Postglacial environmental succession of Nettilling Lake (Baffin Island, Canadian Arctic) focusing on paleo-salinity changes inferred from diatom silica (δ18Odiatom). , Fourth 'PAST Gateways' (Palaeo-Arctic Spatial and Temporal Gateways) International Conference, Trondheim, Norway, 23 May 2016 - 27 May 2016 . hdl:10013/epic.48959 EPIC3Fourth 'PAST Gateways' (Palaeo-Arctic Spatial and Temporal Gateways) International Conference, Trondheim, Norway, 2016-05-23-2016-05-27 Conference notRev 2016 ftawi 2021-12-24T15:42:05Z The need for better understanding of long-term climate and environmental variability in the Foxe Basin (Nunavut, Canada) is highlighted by the major environmental changes in this highly sensitive region, which occupies a transitional position between areas undergoing drastic and more subtle changes in the High and Low Canadian Arctic over the course of the last millennium, respectively. However, high-resolution long-term climate records remain scarce in the Foxe Basin region even though it is of key importance to understanding Holocene climate evolution since the last deglaciation. In order to reconstruct the regional postglacial climatic and environmental variability, we adopted a multi-proxy paleolimnological approach analysing sedimentary records retrieved from Nettilling Lake on southern Baffin Island, involving elemental geochemistry from high-resolution µ-XRF analyses, diatom assemblage composition and oxygen isotope records from fossil diatom silica (δ18Odiatom). The oxygen isotope composition of diatoms (δ18Odiatom) yields extremely large δ18Odiatom variations in the core of more than 13‰ which are mainly driven by changes in the isotopic composition of the lake water due to a shift from glacio-marine to brackish (at ca. 7400 yr cal BP) towards lacustrine conditions (at ca. 6000 yr cal BP) associated with decreasing salinity also documented by shifts in the composition of diatom assemblages. Our study provides evidence that paleo-salinity can be inferred from δ18Odiatom. Additionally, in the lacustrine section of the core,, δ18Odiatom may also serve as a proxy for past air temperatures recording a late Holocene cooling of about 4°C for the greater Baffin region. Furthermore, the results obtained from our study provide new insights into the timing of regional glacier retreat (ca. 8300 cal BP) and the duration of the postglacial marine invasion (from ca. 7400 cal BP to ca. 6000 cal. BP), thereby complementing ongoing research of postglacial environmental dynamics in the Foxe Basin and on south-western Baffin Island. Conference Object Arctic Arctic Baffin Island Baffin Foxe Basin glacier* Nettilling Lake Nunavut Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Arctic Nunavut Baffin Island Canada Foxe Basin ENVELOPE(-77.918,-77.918,65.931,65.931) Nettilling Lake ENVELOPE(-70.333,-70.333,66.483,66.483) |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
The need for better understanding of long-term climate and environmental variability in the Foxe Basin (Nunavut, Canada) is highlighted by the major environmental changes in this highly sensitive region, which occupies a transitional position between areas undergoing drastic and more subtle changes in the High and Low Canadian Arctic over the course of the last millennium, respectively. However, high-resolution long-term climate records remain scarce in the Foxe Basin region even though it is of key importance to understanding Holocene climate evolution since the last deglaciation. In order to reconstruct the regional postglacial climatic and environmental variability, we adopted a multi-proxy paleolimnological approach analysing sedimentary records retrieved from Nettilling Lake on southern Baffin Island, involving elemental geochemistry from high-resolution µ-XRF analyses, diatom assemblage composition and oxygen isotope records from fossil diatom silica (δ18Odiatom). The oxygen isotope composition of diatoms (δ18Odiatom) yields extremely large δ18Odiatom variations in the core of more than 13‰ which are mainly driven by changes in the isotopic composition of the lake water due to a shift from glacio-marine to brackish (at ca. 7400 yr cal BP) towards lacustrine conditions (at ca. 6000 yr cal BP) associated with decreasing salinity also documented by shifts in the composition of diatom assemblages. Our study provides evidence that paleo-salinity can be inferred from δ18Odiatom. Additionally, in the lacustrine section of the core,, δ18Odiatom may also serve as a proxy for past air temperatures recording a late Holocene cooling of about 4°C for the greater Baffin region. Furthermore, the results obtained from our study provide new insights into the timing of regional glacier retreat (ca. 8300 cal BP) and the duration of the postglacial marine invasion (from ca. 7400 cal BP to ca. 6000 cal. BP), thereby complementing ongoing research of postglacial environmental dynamics in the Foxe Basin and on south-western Baffin Island. |
format |
Conference Object |
author |
Meyer, Hanno Narancic, Biljana Chapligin, Bernhard Pienitz, Reinhard |
spellingShingle |
Meyer, Hanno Narancic, Biljana Chapligin, Bernhard Pienitz, Reinhard Postglacial environmental succession of Nettilling Lake (Baffin Island, Canadian Arctic) focusing on paleo-salinity changes inferred from diatom silica (δ18Odiatom). |
author_facet |
Meyer, Hanno Narancic, Biljana Chapligin, Bernhard Pienitz, Reinhard |
author_sort |
Meyer, Hanno |
title |
Postglacial environmental succession of Nettilling Lake (Baffin Island, Canadian Arctic) focusing on paleo-salinity changes inferred from diatom silica (δ18Odiatom). |
title_short |
Postglacial environmental succession of Nettilling Lake (Baffin Island, Canadian Arctic) focusing on paleo-salinity changes inferred from diatom silica (δ18Odiatom). |
title_full |
Postglacial environmental succession of Nettilling Lake (Baffin Island, Canadian Arctic) focusing on paleo-salinity changes inferred from diatom silica (δ18Odiatom). |
title_fullStr |
Postglacial environmental succession of Nettilling Lake (Baffin Island, Canadian Arctic) focusing on paleo-salinity changes inferred from diatom silica (δ18Odiatom). |
title_full_unstemmed |
Postglacial environmental succession of Nettilling Lake (Baffin Island, Canadian Arctic) focusing on paleo-salinity changes inferred from diatom silica (δ18Odiatom). |
title_sort |
postglacial environmental succession of nettilling lake (baffin island, canadian arctic) focusing on paleo-salinity changes inferred from diatom silica (δ18odiatom). |
publishDate |
2016 |
url |
https://epic.awi.de/id/eprint/42236/ https://hdl.handle.net/10013/epic.48959 |
long_lat |
ENVELOPE(-77.918,-77.918,65.931,65.931) ENVELOPE(-70.333,-70.333,66.483,66.483) |
geographic |
Arctic Nunavut Baffin Island Canada Foxe Basin Nettilling Lake |
geographic_facet |
Arctic Nunavut Baffin Island Canada Foxe Basin Nettilling Lake |
genre |
Arctic Arctic Baffin Island Baffin Foxe Basin glacier* Nettilling Lake Nunavut |
genre_facet |
Arctic Arctic Baffin Island Baffin Foxe Basin glacier* Nettilling Lake Nunavut |
op_source |
EPIC3Fourth 'PAST Gateways' (Palaeo-Arctic Spatial and Temporal Gateways) International Conference, Trondheim, Norway, 2016-05-23-2016-05-27 |
op_relation |
Meyer, H. orcid:0000-0003-4129-4706 , Narancic, B. , Chapligin, B. and Pienitz, R. (2016) Postglacial environmental succession of Nettilling Lake (Baffin Island, Canadian Arctic) focusing on paleo-salinity changes inferred from diatom silica (δ18Odiatom). , Fourth 'PAST Gateways' (Palaeo-Arctic Spatial and Temporal Gateways) International Conference, Trondheim, Norway, 23 May 2016 - 27 May 2016 . hdl:10013/epic.48959 |
_version_ |
1766294911092523008 |