Paleoenvironmental inference models from sediment diatom assemblages in Baffin Island lakes (Nunavut, Canada) and reconstruction of summer water temperature
Diatoms from the surface sediments of 61 lakes on Baffin Island, Nunavut, were identified, enumerated, and interpreted quantitatively. The samples span a latitudinal transect from 62 to 74°N, reflecting climatic and vegetational gradients that range from low Arctic to transitional mid-Arctic to high...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Canadian Science Publishing
2001
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Online Access: | http://dx.doi.org/10.1139/f01-071 http://www.nrcresearchpress.com/doi/pdf/10.1139/f01-071 |
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crcansciencepubl:10.1139/f01-071 2024-06-23T07:49:48+00:00 Paleoenvironmental inference models from sediment diatom assemblages in Baffin Island lakes (Nunavut, Canada) and reconstruction of summer water temperature Joynt III, Ernest H Wolfe, Alexander P 2001 http://dx.doi.org/10.1139/f01-071 http://www.nrcresearchpress.com/doi/pdf/10.1139/f01-071 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 58, issue 6, page 1222-1243 ISSN 0706-652X 1205-7533 journal-article 2001 crcansciencepubl https://doi.org/10.1139/f01-071 2024-06-13T04:10:48Z Diatoms from the surface sediments of 61 lakes on Baffin Island, Nunavut, were identified, enumerated, and interpreted quantitatively. The samples span a latitudinal transect from 62 to 74°N, reflecting climatic and vegetational gradients that range from low Arctic to transitional mid-Arctic to high Arctic. While the sampled lakes encompass both predominantly maritime and continental climatic regimes, sites have been deliberately restricted to basins in Precambrian crystalline terrain to mitigate the edaphic consequences of alkaline sedimentary bedrock. Canonical correspondence analysis, using forward selection and Monte Carlo permutation tests, identified pH, conductivity, summer lake water temperature, and mean annual air temperature as significant environmental controls over diatom assemblages. Using weighted-averaging regression and calibration, predictive models for these parameters have been developed. When applied to down-core assemblages, the summer lake water temperature model provides realistic reconstructions when compared with other paleoenvironmental records. Over the past 5000 years, the amplitude of reconstructed summer lake water temperature is on the order of 4.0°C, expressed primarily as progressive Neoglacial cooling culminating in the Little Ice Age. Diatom-inferred summer water temperatures have increased by 2.0°C in the past 150 years, again in agreement with independent paleoclimatic reconstructions. Article in Journal/Newspaper Arctic Baffin Island Baffin Nunavut Canadian Science Publishing Arctic Baffin Island Canada Island Lakes ENVELOPE(-128.226,-128.226,62.344,62.344) Nunavut Canadian Journal of Fisheries and Aquatic Sciences 58 6 1222 1243 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
description |
Diatoms from the surface sediments of 61 lakes on Baffin Island, Nunavut, were identified, enumerated, and interpreted quantitatively. The samples span a latitudinal transect from 62 to 74°N, reflecting climatic and vegetational gradients that range from low Arctic to transitional mid-Arctic to high Arctic. While the sampled lakes encompass both predominantly maritime and continental climatic regimes, sites have been deliberately restricted to basins in Precambrian crystalline terrain to mitigate the edaphic consequences of alkaline sedimentary bedrock. Canonical correspondence analysis, using forward selection and Monte Carlo permutation tests, identified pH, conductivity, summer lake water temperature, and mean annual air temperature as significant environmental controls over diatom assemblages. Using weighted-averaging regression and calibration, predictive models for these parameters have been developed. When applied to down-core assemblages, the summer lake water temperature model provides realistic reconstructions when compared with other paleoenvironmental records. Over the past 5000 years, the amplitude of reconstructed summer lake water temperature is on the order of 4.0°C, expressed primarily as progressive Neoglacial cooling culminating in the Little Ice Age. Diatom-inferred summer water temperatures have increased by 2.0°C in the past 150 years, again in agreement with independent paleoclimatic reconstructions. |
format |
Article in Journal/Newspaper |
author |
Joynt III, Ernest H Wolfe, Alexander P |
spellingShingle |
Joynt III, Ernest H Wolfe, Alexander P Paleoenvironmental inference models from sediment diatom assemblages in Baffin Island lakes (Nunavut, Canada) and reconstruction of summer water temperature |
author_facet |
Joynt III, Ernest H Wolfe, Alexander P |
author_sort |
Joynt III, Ernest H |
title |
Paleoenvironmental inference models from sediment diatom assemblages in Baffin Island lakes (Nunavut, Canada) and reconstruction of summer water temperature |
title_short |
Paleoenvironmental inference models from sediment diatom assemblages in Baffin Island lakes (Nunavut, Canada) and reconstruction of summer water temperature |
title_full |
Paleoenvironmental inference models from sediment diatom assemblages in Baffin Island lakes (Nunavut, Canada) and reconstruction of summer water temperature |
title_fullStr |
Paleoenvironmental inference models from sediment diatom assemblages in Baffin Island lakes (Nunavut, Canada) and reconstruction of summer water temperature |
title_full_unstemmed |
Paleoenvironmental inference models from sediment diatom assemblages in Baffin Island lakes (Nunavut, Canada) and reconstruction of summer water temperature |
title_sort |
paleoenvironmental inference models from sediment diatom assemblages in baffin island lakes (nunavut, canada) and reconstruction of summer water temperature |
publisher |
Canadian Science Publishing |
publishDate |
2001 |
url |
http://dx.doi.org/10.1139/f01-071 http://www.nrcresearchpress.com/doi/pdf/10.1139/f01-071 |
long_lat |
ENVELOPE(-128.226,-128.226,62.344,62.344) |
geographic |
Arctic Baffin Island Canada Island Lakes Nunavut |
geographic_facet |
Arctic Baffin Island Canada Island Lakes Nunavut |
genre |
Arctic Baffin Island Baffin Nunavut |
genre_facet |
Arctic Baffin Island Baffin Nunavut |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 58, issue 6, page 1222-1243 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f01-071 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
58 |
container_issue |
6 |
container_start_page |
1222 |
op_container_end_page |
1243 |
_version_ |
1802640487286308864 |