Radiation budget, ground thermal regime and hydrological balance of a low arctic tundra basin, Coppermine River, Northwest Territories
The effects of slope, aspect and vegetation cover on the radiation balance and active layer thermal regime of arctic tundra were investigated during the summer of 1999 and the spring of 2000. The study site is located at Daring Lake, N.W.T (64°52'N, 111°35'W) in the Slave Geological Provin...
Main Author: | |
---|---|
Format: | Text |
Language: | unknown |
Published: |
Scholars Commons @ Laurier
2002
|
Subjects: | |
Online Access: | https://scholars.wlu.ca/etd/438 https://scholars.wlu.ca/context/etd/article/1437/viewcontent/MQ72639.PDF |
id |
ftwlaurieruniv:oai:scholars.wlu.ca:etd-1437 |
---|---|
record_format |
openpolar |
spelling |
ftwlaurieruniv:oai:scholars.wlu.ca:etd-1437 2023-06-11T04:03:16+02:00 Radiation budget, ground thermal regime and hydrological balance of a low arctic tundra basin, Coppermine River, Northwest Territories Turcotte, David S. 2002-01-01T08:00:00Z application/pdf https://scholars.wlu.ca/etd/438 https://scholars.wlu.ca/context/etd/article/1437/viewcontent/MQ72639.PDF unknown Scholars Commons @ Laurier https://scholars.wlu.ca/etd/438 https://scholars.wlu.ca/context/etd/article/1437/viewcontent/MQ72639.PDF Theses and Dissertations (Comprehensive) Physical and Environmental Geography text 2002 ftwlaurieruniv 2023-05-07T16:36:52Z The effects of slope, aspect and vegetation cover on the radiation balance and active layer thermal regime of arctic tundra were investigated during the summer of 1999 and the spring of 2000. The study site is located at Daring Lake, N.W.T (64°52'N, 111°35'W) in the Slave Geological Province of the Coppermine River Basin. A sub-basin 14 ha in area and with approximately 30 meters of relief was intensely monitored for hydrological radiation and energy balance components. Initiation of active layer development and subsequent thawing was earlier and more pronounced on predominantly west facing slopes due to increased receipt of incoming solar radiation. Late summer active layer depths were the greatest on west-facing slopes as compared to north-and east-facing slopes (>170 cm. 84.0 ±21.7 cm. 49.2 ±0.8 cm respectively). Incoming shortwave radiation values were extrapolated from the met site to various basin sites taking slope and aspect into account. Spatial and diurnal variations in albedo were minimal within the Kakawi Lake Basin. As well, surface temperature measurements varied little from site to site causing the long wave radiation balance to remain relatively constant. Incoming shortwave radiation was determined to control diurnal fluctuations in the net radiation balance on a daily and seasonal basis but represented less than one half (41%) of the radiative supply to the surface. Ground heat flux increased downslope on west- and north-facing hillslopes corresponding with an increase in active layer development during the summer season. Conversely, basal flux out of the active layer to the underlying permafrost decreased downslope. The sensible heat flux varied least with depth between the study sites but accounted for a significant proportion of the ground flux at sites with deeper active layers. Active layer depths at peat dominated, east-facing hillslope sites were only 59% of the average depth on west- and north-facing slopes primarily due to the high water content and reduced thermal conductivity of peat ... Text albedo Arctic Coppermine River Northwest Territories permafrost Tundra Wilfrid Laurier University, Ontario: Scholars Commons@Laurier Arctic Daring Lake ENVELOPE(-111.635,-111.635,64.834,64.834) Northwest Territories |
institution |
Open Polar |
collection |
Wilfrid Laurier University, Ontario: Scholars Commons@Laurier |
op_collection_id |
ftwlaurieruniv |
language |
unknown |
topic |
Physical and Environmental Geography |
spellingShingle |
Physical and Environmental Geography Turcotte, David S. Radiation budget, ground thermal regime and hydrological balance of a low arctic tundra basin, Coppermine River, Northwest Territories |
topic_facet |
Physical and Environmental Geography |
description |
The effects of slope, aspect and vegetation cover on the radiation balance and active layer thermal regime of arctic tundra were investigated during the summer of 1999 and the spring of 2000. The study site is located at Daring Lake, N.W.T (64°52'N, 111°35'W) in the Slave Geological Province of the Coppermine River Basin. A sub-basin 14 ha in area and with approximately 30 meters of relief was intensely monitored for hydrological radiation and energy balance components. Initiation of active layer development and subsequent thawing was earlier and more pronounced on predominantly west facing slopes due to increased receipt of incoming solar radiation. Late summer active layer depths were the greatest on west-facing slopes as compared to north-and east-facing slopes (>170 cm. 84.0 ±21.7 cm. 49.2 ±0.8 cm respectively). Incoming shortwave radiation values were extrapolated from the met site to various basin sites taking slope and aspect into account. Spatial and diurnal variations in albedo were minimal within the Kakawi Lake Basin. As well, surface temperature measurements varied little from site to site causing the long wave radiation balance to remain relatively constant. Incoming shortwave radiation was determined to control diurnal fluctuations in the net radiation balance on a daily and seasonal basis but represented less than one half (41%) of the radiative supply to the surface. Ground heat flux increased downslope on west- and north-facing hillslopes corresponding with an increase in active layer development during the summer season. Conversely, basal flux out of the active layer to the underlying permafrost decreased downslope. The sensible heat flux varied least with depth between the study sites but accounted for a significant proportion of the ground flux at sites with deeper active layers. Active layer depths at peat dominated, east-facing hillslope sites were only 59% of the average depth on west- and north-facing slopes primarily due to the high water content and reduced thermal conductivity of peat ... |
format |
Text |
author |
Turcotte, David S. |
author_facet |
Turcotte, David S. |
author_sort |
Turcotte, David S. |
title |
Radiation budget, ground thermal regime and hydrological balance of a low arctic tundra basin, Coppermine River, Northwest Territories |
title_short |
Radiation budget, ground thermal regime and hydrological balance of a low arctic tundra basin, Coppermine River, Northwest Territories |
title_full |
Radiation budget, ground thermal regime and hydrological balance of a low arctic tundra basin, Coppermine River, Northwest Territories |
title_fullStr |
Radiation budget, ground thermal regime and hydrological balance of a low arctic tundra basin, Coppermine River, Northwest Territories |
title_full_unstemmed |
Radiation budget, ground thermal regime and hydrological balance of a low arctic tundra basin, Coppermine River, Northwest Territories |
title_sort |
radiation budget, ground thermal regime and hydrological balance of a low arctic tundra basin, coppermine river, northwest territories |
publisher |
Scholars Commons @ Laurier |
publishDate |
2002 |
url |
https://scholars.wlu.ca/etd/438 https://scholars.wlu.ca/context/etd/article/1437/viewcontent/MQ72639.PDF |
long_lat |
ENVELOPE(-111.635,-111.635,64.834,64.834) |
geographic |
Arctic Daring Lake Northwest Territories |
geographic_facet |
Arctic Daring Lake Northwest Territories |
genre |
albedo Arctic Coppermine River Northwest Territories permafrost Tundra |
genre_facet |
albedo Arctic Coppermine River Northwest Territories permafrost Tundra |
op_source |
Theses and Dissertations (Comprehensive) |
op_relation |
https://scholars.wlu.ca/etd/438 https://scholars.wlu.ca/context/etd/article/1437/viewcontent/MQ72639.PDF |
_version_ |
1768378081058226176 |