ASSESSMENT OF FRESH-WATER DIATOMS AS QUANTITATIVE INDICATORS OF PAST CLIMATIC-CHANGE IN THE YUKON AND NORTHWEST-TERRITORIES, CANADA
We identified, enumerated, and interpreted the diatom assemblages preserved in the surface sediments of 59 lakes located between Whitehorse in the Yukon and Tuktoyaktuk in the Northwest Territories (Canada). The lakes are distributed along a latitudinal gradient that includes several ecoclimatic zon...
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1995
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ftucl:oai:eprints.ucl.ac.uk.OAI2:165814 2023-05-15T15:06:34+02:00 ASSESSMENT OF FRESH-WATER DIATOMS AS QUANTITATIVE INDICATORS OF PAST CLIMATIC-CHANGE IN THE YUKON AND NORTHWEST-TERRITORIES, CANADA PIENITZ, R SMOL, JP BIRKS, HJB 1995-01 http://discovery.ucl.ac.uk/165814/ unknown KLUWER ACADEMIC PUBL J PALEOLIMNOL , 13 (1) 21 - 49. (1995) DIATOMS TEMPERATURE CLIMATIC CHANGE PALEOCLIMATE PROXIES CANONICAL CORRESPONDENCE ANALYSIS WEIGHTED AVERAGING YUKON NORTHWEST TERRITORIES CANONICAL CORRESPONDENCE-ANALYSIS PAPUA-NEW-GUINEA ENVIRONMENTAL VARIABLES PH RECONSTRUCTION GRADIENT ANALYSIS LAKES GROWTH ASSEMBLAGES CALIBRATION Article 1995 ftucl 2016-12-15T23:08:44Z We identified, enumerated, and interpreted the diatom assemblages preserved in the surface sediments of 59 lakes located between Whitehorse in the Yukon and Tuktoyaktuk in the Northwest Territories (Canada). The lakes are distributed along a latitudinal gradient that includes several ecoclimatic zones. It also spans large gradients in limnological variables. Thus, the study lakes are ideal for environmental calibration of modern diatom assemblages. Canonical correspondence analysis, with forward selection and Monte Carlo permutation tests, showed that maximum lake depth and summer surface-water temperature were the two environmental variables that accounted for most of the variance in the diatom data. The concentrations of sodium and calcium were also important explanatory variables. Using weighted-averaging regression and calibration techniques, we developed a predictive statistical model to infer lake surface-water temperature, and we evaluated the feasibility of using diatoms as paleoclimate proxies. This model may be used to derive paleotemperature inferences from fossil diatom assemblages at appropriate sites in the western Canadian Arctic. Article in Journal/Newspaper Arctic Northwest Territories Tuktoyaktuk Whitehorse Yukon University College London: UCL Discovery Arctic Yukon Northwest Territories Canada Tuktoyaktuk ENVELOPE(-133.006,-133.006,69.425,69.425) |
institution |
Open Polar |
collection |
University College London: UCL Discovery |
op_collection_id |
ftucl |
language |
unknown |
topic |
DIATOMS TEMPERATURE CLIMATIC CHANGE PALEOCLIMATE PROXIES CANONICAL CORRESPONDENCE ANALYSIS WEIGHTED AVERAGING YUKON NORTHWEST TERRITORIES CANONICAL CORRESPONDENCE-ANALYSIS PAPUA-NEW-GUINEA ENVIRONMENTAL VARIABLES PH RECONSTRUCTION GRADIENT ANALYSIS LAKES GROWTH ASSEMBLAGES CALIBRATION |
spellingShingle |
DIATOMS TEMPERATURE CLIMATIC CHANGE PALEOCLIMATE PROXIES CANONICAL CORRESPONDENCE ANALYSIS WEIGHTED AVERAGING YUKON NORTHWEST TERRITORIES CANONICAL CORRESPONDENCE-ANALYSIS PAPUA-NEW-GUINEA ENVIRONMENTAL VARIABLES PH RECONSTRUCTION GRADIENT ANALYSIS LAKES GROWTH ASSEMBLAGES CALIBRATION PIENITZ, R SMOL, JP BIRKS, HJB ASSESSMENT OF FRESH-WATER DIATOMS AS QUANTITATIVE INDICATORS OF PAST CLIMATIC-CHANGE IN THE YUKON AND NORTHWEST-TERRITORIES, CANADA |
topic_facet |
DIATOMS TEMPERATURE CLIMATIC CHANGE PALEOCLIMATE PROXIES CANONICAL CORRESPONDENCE ANALYSIS WEIGHTED AVERAGING YUKON NORTHWEST TERRITORIES CANONICAL CORRESPONDENCE-ANALYSIS PAPUA-NEW-GUINEA ENVIRONMENTAL VARIABLES PH RECONSTRUCTION GRADIENT ANALYSIS LAKES GROWTH ASSEMBLAGES CALIBRATION |
description |
We identified, enumerated, and interpreted the diatom assemblages preserved in the surface sediments of 59 lakes located between Whitehorse in the Yukon and Tuktoyaktuk in the Northwest Territories (Canada). The lakes are distributed along a latitudinal gradient that includes several ecoclimatic zones. It also spans large gradients in limnological variables. Thus, the study lakes are ideal for environmental calibration of modern diatom assemblages. Canonical correspondence analysis, with forward selection and Monte Carlo permutation tests, showed that maximum lake depth and summer surface-water temperature were the two environmental variables that accounted for most of the variance in the diatom data. The concentrations of sodium and calcium were also important explanatory variables. Using weighted-averaging regression and calibration techniques, we developed a predictive statistical model to infer lake surface-water temperature, and we evaluated the feasibility of using diatoms as paleoclimate proxies. This model may be used to derive paleotemperature inferences from fossil diatom assemblages at appropriate sites in the western Canadian Arctic. |
format |
Article in Journal/Newspaper |
author |
PIENITZ, R SMOL, JP BIRKS, HJB |
author_facet |
PIENITZ, R SMOL, JP BIRKS, HJB |
author_sort |
PIENITZ, R |
title |
ASSESSMENT OF FRESH-WATER DIATOMS AS QUANTITATIVE INDICATORS OF PAST CLIMATIC-CHANGE IN THE YUKON AND NORTHWEST-TERRITORIES, CANADA |
title_short |
ASSESSMENT OF FRESH-WATER DIATOMS AS QUANTITATIVE INDICATORS OF PAST CLIMATIC-CHANGE IN THE YUKON AND NORTHWEST-TERRITORIES, CANADA |
title_full |
ASSESSMENT OF FRESH-WATER DIATOMS AS QUANTITATIVE INDICATORS OF PAST CLIMATIC-CHANGE IN THE YUKON AND NORTHWEST-TERRITORIES, CANADA |
title_fullStr |
ASSESSMENT OF FRESH-WATER DIATOMS AS QUANTITATIVE INDICATORS OF PAST CLIMATIC-CHANGE IN THE YUKON AND NORTHWEST-TERRITORIES, CANADA |
title_full_unstemmed |
ASSESSMENT OF FRESH-WATER DIATOMS AS QUANTITATIVE INDICATORS OF PAST CLIMATIC-CHANGE IN THE YUKON AND NORTHWEST-TERRITORIES, CANADA |
title_sort |
assessment of fresh-water diatoms as quantitative indicators of past climatic-change in the yukon and northwest-territories, canada |
publisher |
KLUWER ACADEMIC PUBL |
publishDate |
1995 |
url |
http://discovery.ucl.ac.uk/165814/ |
long_lat |
ENVELOPE(-133.006,-133.006,69.425,69.425) |
geographic |
Arctic Yukon Northwest Territories Canada Tuktoyaktuk |
geographic_facet |
Arctic Yukon Northwest Territories Canada Tuktoyaktuk |
genre |
Arctic Northwest Territories Tuktoyaktuk Whitehorse Yukon |
genre_facet |
Arctic Northwest Territories Tuktoyaktuk Whitehorse Yukon |
op_source |
J PALEOLIMNOL , 13 (1) 21 - 49. (1995) |
_version_ |
1766338149336743936 |