Late Holocene Environmental Change Across the Canadian Arctic
Lake sediment cores spanning the last 2000 years from four sites across the Canadian Arctic Archipelago (CAA) document the responses of terrestrial and freshwater ecosystems to regional climate variability. Biogenic silica (BSi) records in cores from Banks Island, NWT (Lake B503; 72.3245, -123.4036,...
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ftunivottawa:oai:ruor.uottawa.ca:10393/38837 2023-05-15T14:28:57+02:00 Late Holocene Environmental Change Across the Canadian Arctic Tamo, Camille Gajewski, Konrad 2019-02-21 application/pdf http://hdl.handle.net/10393/38837 https://doi.org/10.20381/ruor-23089 en eng Université d'Ottawa / University of Ottawa http://hdl.handle.net/10393/38837 http://dx.doi.org/10.20381/ruor-23089 paleoclimate pollen Arctic diatoms Little Ice Age vegetation Medieval Climate Anomaly Common Era Holocene Thesis 2019 ftunivottawa https://doi.org/10.20381/ruor-23089 2021-01-04T14:36:29Z Lake sediment cores spanning the last 2000 years from four sites across the Canadian Arctic Archipelago (CAA) document the responses of terrestrial and freshwater ecosystems to regional climate variability. Biogenic silica (BSi) records in cores from Banks Island, NWT (Lake B503; 72.3245, -123.4036, 84 masl), Bathurst Island, Nunavut (PR01; 75.6497, -99.1144, 30 masl), Prince of Wales Island, Nunavut (SW08; 72.3177, -97.2678, 104 masl), and Ellesmere Island, Nunavut (CV03; 79.9211, -82.9348, 363 masl) were used to examine the relationship between diatom production and climate. A pollen record from Prince of Wales Island provided the first high-resolution July temperature reconstruction for the last 1000 years for the central CAA. Dissolution was evident in three out of the four lakes; core SW08 contained no BSi above detection and cores CV03 and PR01 only contained values above detection in the uppermost sediments, suggesting that the preservation of biogenic silica (BSi) in the sediment is likely influenced by sedimentary carbonates. A BSi sequence from core B503 showed that diatom production was affected by climate changes such as the Medieval Climate Anomaly and the Little Ice Age. The vegetation on southern Prince of Wales Island underwent marked transitions during the Little Ice Age and Medieval Climate Anomaly, which was mainly observed in the proportion of Cyperaceae and Poaceae. The mean July temperature reconstruction showed a long-term cooling from 1080-1915 CE with a sustained cold period from 1800-1915 CE prior to 20th-century warming. A synthesis of paleoclimate records from across the Arctic demonstrated that pollen-based reconstructions record both high and low frequency climate variability, when sampling resolution is sufficient, and can improve regional climate reconstructions. Thesis Arctic Archipelago Arctic Banks Island Bathurst Island Canadian Arctic Archipelago Ellesmere Island Nunavut Prince of Wales Island uO Research (University of Ottawa - uOttawa) Arctic Bathurst Island ENVELOPE(-100.002,-100.002,75.752,75.752) Canadian Arctic Archipelago Ellesmere Island Four Lakes ENVELOPE(-126.826,-126.826,54.858,54.858) Nunavut Prince of Wales Island ENVELOPE(-99.001,-99.001,72.668,72.668) |
institution |
Open Polar |
collection |
uO Research (University of Ottawa - uOttawa) |
op_collection_id |
ftunivottawa |
language |
English |
topic |
paleoclimate pollen Arctic diatoms Little Ice Age vegetation Medieval Climate Anomaly Common Era Holocene |
spellingShingle |
paleoclimate pollen Arctic diatoms Little Ice Age vegetation Medieval Climate Anomaly Common Era Holocene Tamo, Camille Late Holocene Environmental Change Across the Canadian Arctic |
topic_facet |
paleoclimate pollen Arctic diatoms Little Ice Age vegetation Medieval Climate Anomaly Common Era Holocene |
description |
Lake sediment cores spanning the last 2000 years from four sites across the Canadian Arctic Archipelago (CAA) document the responses of terrestrial and freshwater ecosystems to regional climate variability. Biogenic silica (BSi) records in cores from Banks Island, NWT (Lake B503; 72.3245, -123.4036, 84 masl), Bathurst Island, Nunavut (PR01; 75.6497, -99.1144, 30 masl), Prince of Wales Island, Nunavut (SW08; 72.3177, -97.2678, 104 masl), and Ellesmere Island, Nunavut (CV03; 79.9211, -82.9348, 363 masl) were used to examine the relationship between diatom production and climate. A pollen record from Prince of Wales Island provided the first high-resolution July temperature reconstruction for the last 1000 years for the central CAA. Dissolution was evident in three out of the four lakes; core SW08 contained no BSi above detection and cores CV03 and PR01 only contained values above detection in the uppermost sediments, suggesting that the preservation of biogenic silica (BSi) in the sediment is likely influenced by sedimentary carbonates. A BSi sequence from core B503 showed that diatom production was affected by climate changes such as the Medieval Climate Anomaly and the Little Ice Age. The vegetation on southern Prince of Wales Island underwent marked transitions during the Little Ice Age and Medieval Climate Anomaly, which was mainly observed in the proportion of Cyperaceae and Poaceae. The mean July temperature reconstruction showed a long-term cooling from 1080-1915 CE with a sustained cold period from 1800-1915 CE prior to 20th-century warming. A synthesis of paleoclimate records from across the Arctic demonstrated that pollen-based reconstructions record both high and low frequency climate variability, when sampling resolution is sufficient, and can improve regional climate reconstructions. |
author2 |
Gajewski, Konrad |
format |
Thesis |
author |
Tamo, Camille |
author_facet |
Tamo, Camille |
author_sort |
Tamo, Camille |
title |
Late Holocene Environmental Change Across the Canadian Arctic |
title_short |
Late Holocene Environmental Change Across the Canadian Arctic |
title_full |
Late Holocene Environmental Change Across the Canadian Arctic |
title_fullStr |
Late Holocene Environmental Change Across the Canadian Arctic |
title_full_unstemmed |
Late Holocene Environmental Change Across the Canadian Arctic |
title_sort |
late holocene environmental change across the canadian arctic |
publisher |
Université d'Ottawa / University of Ottawa |
publishDate |
2019 |
url |
http://hdl.handle.net/10393/38837 https://doi.org/10.20381/ruor-23089 |
long_lat |
ENVELOPE(-100.002,-100.002,75.752,75.752) ENVELOPE(-126.826,-126.826,54.858,54.858) ENVELOPE(-99.001,-99.001,72.668,72.668) |
geographic |
Arctic Bathurst Island Canadian Arctic Archipelago Ellesmere Island Four Lakes Nunavut Prince of Wales Island |
geographic_facet |
Arctic Bathurst Island Canadian Arctic Archipelago Ellesmere Island Four Lakes Nunavut Prince of Wales Island |
genre |
Arctic Archipelago Arctic Banks Island Bathurst Island Canadian Arctic Archipelago Ellesmere Island Nunavut Prince of Wales Island |
genre_facet |
Arctic Archipelago Arctic Banks Island Bathurst Island Canadian Arctic Archipelago Ellesmere Island Nunavut Prince of Wales Island |
op_relation |
http://hdl.handle.net/10393/38837 http://dx.doi.org/10.20381/ruor-23089 |
op_doi |
https://doi.org/10.20381/ruor-23089 |
_version_ |
1766303070570938368 |