A 5000‐year paleoclimate record from Nettilling Lake (Baffin Island) based on diatom assemblages and oxygen isotope composition
ABSTRACT Sedimentary diatoms have been used to quantitatively reconstruct climate‐related variables, such as temperature at different timescales. Even though temperature is often less of a key driver of diatom ecology than other environmental parameters (water chemistry), diatom inference models hav...
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crwiley:10.1002/jqs.3366 2024-06-02T08:03:50+00:00 A 5000‐year paleoclimate record from Nettilling Lake (Baffin Island) based on diatom assemblages and oxygen isotope composition Narancic, Biljana Saulnier‐Talbot, Émilie Meyer, Hanno Pienitz, Reinhard Canadian Network for Research and Innovation in Machining Technology, Natural Sciences and Engineering Research Council of Canada Canadian Network for Research and Innovation in Machining Technology, Natural Sciences and Engineering Research Council of Canada 2021 http://dx.doi.org/10.1002/jqs.3366 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.3366 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/jqs.3366 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Quaternary Science volume 37, issue 5, page 959-966 ISSN 0267-8179 1099-1417 journal-article 2021 crwiley https://doi.org/10.1002/jqs.3366 2024-05-03T11:56:56Z ABSTRACT Sedimentary diatoms have been used to quantitatively reconstruct climate‐related variables, such as temperature at different timescales. Even though temperature is often less of a key driver of diatom ecology than other environmental parameters (water chemistry), diatom inference models have been shown to be reliable in deducing past temperature trends. In addition, the oxygen isotope composition (δ 18 O diatom ) preserved in buried diatom frustules has demonstrated its potential to reflect climatic and hydrological conditions at the time of frustule formation. This study combines results from both diatom‐based climate proxies to reconstruct summer water and mean annual air temperatures, and hydrological trends in Nettilling Lake, Baffin Island, from ca. 5000 to 500 cal a bp. Diatom‐inferred temperatures revealed an overall ca. 2 °C cooling throughout the Late‐Holocene. The δ 18 O diatom values showed an increasing trend up to ca. 1900 cal a bp , where they reached their highest values (+24.8‰ at 15 cm) and thereafter decreased to their lowest values (+21.4‰ at 4 cm). These trends were linked to meltwater inflows associated with Penny Ice Cap thaw rate that was in turn controlled by regional climatic conditions which went from intensified cooling during the Neoglacial period to slight warming thereafter. Our results suggest that diatom‐ and diatom‐isotope‐based temperature and hydrological reconstructions can identify trends related to the natural climate system variability. The diatom oxygen isotopes are useful for paleoenvironmental studies of terrestrial aquatic ecosystems, but not for all hydrological systems are the ideal temperature proxy. Hence, the combination of proxies helps to disentangle temperature and hydrological effects for paleoclimatic reconstructions and may support future studies of postglacial environmental change in northern lakes. Article in Journal/Newspaper Baffin Island Baffin Ice cap Nettilling Lake Penny Ice Cap Wiley Online Library Baffin Island Nettilling Lake ENVELOPE(-70.333,-70.333,66.483,66.483) Penny Ice Cap ENVELOPE(-66.214,-66.214,67.284,67.284) Journal of Quaternary Science |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
ABSTRACT Sedimentary diatoms have been used to quantitatively reconstruct climate‐related variables, such as temperature at different timescales. Even though temperature is often less of a key driver of diatom ecology than other environmental parameters (water chemistry), diatom inference models have been shown to be reliable in deducing past temperature trends. In addition, the oxygen isotope composition (δ 18 O diatom ) preserved in buried diatom frustules has demonstrated its potential to reflect climatic and hydrological conditions at the time of frustule formation. This study combines results from both diatom‐based climate proxies to reconstruct summer water and mean annual air temperatures, and hydrological trends in Nettilling Lake, Baffin Island, from ca. 5000 to 500 cal a bp. Diatom‐inferred temperatures revealed an overall ca. 2 °C cooling throughout the Late‐Holocene. The δ 18 O diatom values showed an increasing trend up to ca. 1900 cal a bp , where they reached their highest values (+24.8‰ at 15 cm) and thereafter decreased to their lowest values (+21.4‰ at 4 cm). These trends were linked to meltwater inflows associated with Penny Ice Cap thaw rate that was in turn controlled by regional climatic conditions which went from intensified cooling during the Neoglacial period to slight warming thereafter. Our results suggest that diatom‐ and diatom‐isotope‐based temperature and hydrological reconstructions can identify trends related to the natural climate system variability. The diatom oxygen isotopes are useful for paleoenvironmental studies of terrestrial aquatic ecosystems, but not for all hydrological systems are the ideal temperature proxy. Hence, the combination of proxies helps to disentangle temperature and hydrological effects for paleoclimatic reconstructions and may support future studies of postglacial environmental change in northern lakes. |
author2 |
Canadian Network for Research and Innovation in Machining Technology, Natural Sciences and Engineering Research Council of Canada Canadian Network for Research and Innovation in Machining Technology, Natural Sciences and Engineering Research Council of Canada |
format |
Article in Journal/Newspaper |
author |
Narancic, Biljana Saulnier‐Talbot, Émilie Meyer, Hanno Pienitz, Reinhard |
spellingShingle |
Narancic, Biljana Saulnier‐Talbot, Émilie Meyer, Hanno Pienitz, Reinhard A 5000‐year paleoclimate record from Nettilling Lake (Baffin Island) based on diatom assemblages and oxygen isotope composition |
author_facet |
Narancic, Biljana Saulnier‐Talbot, Émilie Meyer, Hanno Pienitz, Reinhard |
author_sort |
Narancic, Biljana |
title |
A 5000‐year paleoclimate record from Nettilling Lake (Baffin Island) based on diatom assemblages and oxygen isotope composition |
title_short |
A 5000‐year paleoclimate record from Nettilling Lake (Baffin Island) based on diatom assemblages and oxygen isotope composition |
title_full |
A 5000‐year paleoclimate record from Nettilling Lake (Baffin Island) based on diatom assemblages and oxygen isotope composition |
title_fullStr |
A 5000‐year paleoclimate record from Nettilling Lake (Baffin Island) based on diatom assemblages and oxygen isotope composition |
title_full_unstemmed |
A 5000‐year paleoclimate record from Nettilling Lake (Baffin Island) based on diatom assemblages and oxygen isotope composition |
title_sort |
5000‐year paleoclimate record from nettilling lake (baffin island) based on diatom assemblages and oxygen isotope composition |
publisher |
Wiley |
publishDate |
2021 |
url |
http://dx.doi.org/10.1002/jqs.3366 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.3366 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/jqs.3366 |
long_lat |
ENVELOPE(-70.333,-70.333,66.483,66.483) ENVELOPE(-66.214,-66.214,67.284,67.284) |
geographic |
Baffin Island Nettilling Lake Penny Ice Cap |
geographic_facet |
Baffin Island Nettilling Lake Penny Ice Cap |
genre |
Baffin Island Baffin Ice cap Nettilling Lake Penny Ice Cap |
genre_facet |
Baffin Island Baffin Ice cap Nettilling Lake Penny Ice Cap |
op_source |
Journal of Quaternary Science volume 37, issue 5, page 959-966 ISSN 0267-8179 1099-1417 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/jqs.3366 |
container_title |
Journal of Quaternary Science |
_version_ |
1800748443070627840 |