Chironomid-based paleotemperature reconstruction of the North Slave Region, Northwest Territories during the Late Holocene
I reconstructed late Holocene mean July air temperatures using a chironomid-based inference model based on lake sediment collected from two shallow lakes within the North Slave Region, Northwest Territories. No significant shifts were identified in the chironomid species assemblages, which indicated...
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| Format: | Thesis |
| Language: | unknown |
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2021
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| Online Access: | https://curve.carleton.ca/d5178d62-c48e-44e7-875c-ee53c849b7fb https://doi.org/10.22215/etd/2021-14634 |
| Summary: | I reconstructed late Holocene mean July air temperatures using a chironomid-based inference model based on lake sediment collected from two shallow lakes within the North Slave Region, Northwest Territories. No significant shifts were identified in the chironomid species assemblages, which indicated that these lakes experienced very little environmental change over the last approximately 500 years. Discrepancies were identified between the chironomid-temperature records which may be due to site-specific catchment characteristics obscuring the regional chironomid-temperature signal. The significant Chan Lake temperature reconstruction had similar late Holocene climate events as other regional climate records, such as brief warming events throughout the 1700s and the current warming trend (~ 1850 - present day). A paleofire-climate analysis was also conducted, however, there was no relationship between reconstructed fire events and warmer chironomid inferred mean-July air temperatures. These findings contribute to the characterization of environmental change in Subarctic lakes of northwestern Canada. |
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