Evapotranspirative Controls in a Low Arctic Tundra Environment, Daring Lake, NWT, Canada
Determining the extent to which changes in vegetation assemblages influence evapotranspiration in the Arctic could potentially contribute to a more realistic estimation of evaporation in a warming climate. This project aims to determine whether variations in PET and AET rates measured at six tundra...
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ftwlaurieruniv:oai:scholars.wlu.ca:etd-1881 2023-06-11T04:08:48+02:00 Evapotranspirative Controls in a Low Arctic Tundra Environment, Daring Lake, NWT, Canada LeCompte, Shawn 2007-01-01T08:00:00Z application/pdf https://scholars.wlu.ca/etd/882 https://scholars.wlu.ca/context/etd/article/1881/viewcontent/MR38730.PDF unknown Scholars Commons @ Laurier https://scholars.wlu.ca/etd/882 https://scholars.wlu.ca/context/etd/article/1881/viewcontent/MR38730.PDF Theses and Dissertations (Comprehensive) Physical and Environmental Geography text 2007 ftwlaurieruniv 2023-05-07T16:37:22Z Determining the extent to which changes in vegetation assemblages influence evapotranspiration in the Arctic could potentially contribute to a more realistic estimation of evaporation in a warming climate. This project aims to determine whether variations in PET and AET rates measured at six tundra vegetation communities can be attributed to the differing vegetation. This will provide a more realistic estimate of change in the water and energy cycles, as well as evaporative processes for a warmer future, caused by enhanced global warming. Predictions of temperature and precipitation regarding future climate in Canada’s Western low Arctic vary greatly. The majority of existing Global Climate Models, regardless of how predicted precipitation increases, indicate that the moisture deficit in the Canadian arctic will grow, due to an increase in evaporation. Weighted mean AET was estimated for the year 2040 using four scenarios detailing differing changes in summer air temperature and soil moisture. Given a new distribution of plant communities, it was found that any differences in mean temperature produced negligible effects on forecast ET, whereas an increasing soil moisture deficit lead to lower ET. Evapotranspiration was estimated using field data obtained at Daring Lake, NWT, between June 21 and August 18, 2006. Potential evapotranspiration (PET) was quantified using the Priestly-Taylor method. Results ranged varied between 2.2 and 5.6 mm/day and varied between sites. Actual evapotranspiration (AET) was quantified using a series of lysimeters in five different vegetation communities. Lysimeter results ranged between 1.3 and 3.2 mm/day. Using and ICONOS imaging map of the Daring Lake region (Figure 3.6), coverage was estimated each sampled vegetation community and a weighted mean AET for the Daring Lake Study Site was calculated: 2.2 mm/day. Text Arctic Global warming Tundra Wilfrid Laurier University, Ontario: Scholars Commons@Laurier Arctic Canada Daring Lake ENVELOPE(-111.635,-111.635,64.834,64.834) |
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Wilfrid Laurier University, Ontario: Scholars Commons@Laurier |
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ftwlaurieruniv |
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unknown |
topic |
Physical and Environmental Geography |
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Physical and Environmental Geography LeCompte, Shawn Evapotranspirative Controls in a Low Arctic Tundra Environment, Daring Lake, NWT, Canada |
topic_facet |
Physical and Environmental Geography |
description |
Determining the extent to which changes in vegetation assemblages influence evapotranspiration in the Arctic could potentially contribute to a more realistic estimation of evaporation in a warming climate. This project aims to determine whether variations in PET and AET rates measured at six tundra vegetation communities can be attributed to the differing vegetation. This will provide a more realistic estimate of change in the water and energy cycles, as well as evaporative processes for a warmer future, caused by enhanced global warming. Predictions of temperature and precipitation regarding future climate in Canada’s Western low Arctic vary greatly. The majority of existing Global Climate Models, regardless of how predicted precipitation increases, indicate that the moisture deficit in the Canadian arctic will grow, due to an increase in evaporation. Weighted mean AET was estimated for the year 2040 using four scenarios detailing differing changes in summer air temperature and soil moisture. Given a new distribution of plant communities, it was found that any differences in mean temperature produced negligible effects on forecast ET, whereas an increasing soil moisture deficit lead to lower ET. Evapotranspiration was estimated using field data obtained at Daring Lake, NWT, between June 21 and August 18, 2006. Potential evapotranspiration (PET) was quantified using the Priestly-Taylor method. Results ranged varied between 2.2 and 5.6 mm/day and varied between sites. Actual evapotranspiration (AET) was quantified using a series of lysimeters in five different vegetation communities. Lysimeter results ranged between 1.3 and 3.2 mm/day. Using and ICONOS imaging map of the Daring Lake region (Figure 3.6), coverage was estimated each sampled vegetation community and a weighted mean AET for the Daring Lake Study Site was calculated: 2.2 mm/day. |
format |
Text |
author |
LeCompte, Shawn |
author_facet |
LeCompte, Shawn |
author_sort |
LeCompte, Shawn |
title |
Evapotranspirative Controls in a Low Arctic Tundra Environment, Daring Lake, NWT, Canada |
title_short |
Evapotranspirative Controls in a Low Arctic Tundra Environment, Daring Lake, NWT, Canada |
title_full |
Evapotranspirative Controls in a Low Arctic Tundra Environment, Daring Lake, NWT, Canada |
title_fullStr |
Evapotranspirative Controls in a Low Arctic Tundra Environment, Daring Lake, NWT, Canada |
title_full_unstemmed |
Evapotranspirative Controls in a Low Arctic Tundra Environment, Daring Lake, NWT, Canada |
title_sort |
evapotranspirative controls in a low arctic tundra environment, daring lake, nwt, canada |
publisher |
Scholars Commons @ Laurier |
publishDate |
2007 |
url |
https://scholars.wlu.ca/etd/882 https://scholars.wlu.ca/context/etd/article/1881/viewcontent/MR38730.PDF |
long_lat |
ENVELOPE(-111.635,-111.635,64.834,64.834) |
geographic |
Arctic Canada Daring Lake |
geographic_facet |
Arctic Canada Daring Lake |
genre |
Arctic Global warming Tundra |
genre_facet |
Arctic Global warming Tundra |
op_source |
Theses and Dissertations (Comprehensive) |
op_relation |
https://scholars.wlu.ca/etd/882 https://scholars.wlu.ca/context/etd/article/1881/viewcontent/MR38730.PDF |
_version_ |
1768382329249595392 |