Validating Canadian land surface scheme heat fluxes under subarctic tundra conditions
This study tests the ability of the Canadian Land Surface Scheme (CLASS) to simulate sensible and latent heat fluxes over two subarctic tundra sites in the Trail Valley Creek (TVC) drainage basin, North West Territories, Canada. CLASS simulations with and without the new organic soil parameterisatio...
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ftcanadathes:oai:collectionscanada.gc.ca:QMM.29471 2023-05-15T17:58:02+02:00 Validating Canadian land surface scheme heat fluxes under subarctic tundra conditions Rodgers, David G. Lin, Charles A. (advisor) Master of Science (Department of Atmospheric and Oceanic Sciences.) 2002 application/pdf http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=29471 en eng McGill University alephsysno: 001956722 proquestno: MQ85821 Theses scanned by UMI/ProQuest. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=29471 All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. Physics Atmospheric Science Electronic Thesis or Dissertation 2002 ftcanadathes 2014-02-16T01:03:11Z This study tests the ability of the Canadian Land Surface Scheme (CLASS) to simulate sensible and latent heat fluxes over two subarctic tundra sites in the Trail Valley Creek (TVC) drainage basin, North West Territories, Canada. CLASS simulations with and without the new organic soil parameterisation developed for peatland conditions were compared with three summer months of measurements at each site. The sites are located in a cryoturbated region and are underlain by continuous permafrost and feature mineral soil hummocks and organic soil inter-hummock zones. Results from the peatland version of CLASS showed significant improvement over the standard version although in both cases, there was an underestimation of latent heat fluxes and overestimation of sensible heat fluxes. The observed soil moisture contents are almost constant at both sites. Field photographs show the sites are located in low-lying areas, one in a local depression and the other at the bottom of a valley. Thus, it is reasonable to assume that the constant soil moisture content is maintained by lateral flow from adjacent hillslopes. This assumption could be further supported by the influence of mineral earth hummocks in TVC drainage basin. CLASS is a one-dimensional column model and it is not possible to explicitly represent lateral flow. Thus a nudging module is added to the peatland version of CLASS to reflect this horizontal water movement. Simulations were further improved with this modification. This additional module is a simple and effective way to represent the effect of lateral flow. Thesis permafrost Subarctic Tundra Theses Canada/Thèses Canada (Library and Archives Canada) Canada Trail Valley Creek ENVELOPE(-133.415,-133.415,68.772,68.772) Valley Creek ENVELOPE(-138.324,-138.324,63.326,63.326) |
institution |
Open Polar |
collection |
Theses Canada/Thèses Canada (Library and Archives Canada) |
op_collection_id |
ftcanadathes |
language |
English |
topic |
Physics Atmospheric Science |
spellingShingle |
Physics Atmospheric Science Rodgers, David G. Validating Canadian land surface scheme heat fluxes under subarctic tundra conditions |
topic_facet |
Physics Atmospheric Science |
description |
This study tests the ability of the Canadian Land Surface Scheme (CLASS) to simulate sensible and latent heat fluxes over two subarctic tundra sites in the Trail Valley Creek (TVC) drainage basin, North West Territories, Canada. CLASS simulations with and without the new organic soil parameterisation developed for peatland conditions were compared with three summer months of measurements at each site. The sites are located in a cryoturbated region and are underlain by continuous permafrost and feature mineral soil hummocks and organic soil inter-hummock zones. Results from the peatland version of CLASS showed significant improvement over the standard version although in both cases, there was an underestimation of latent heat fluxes and overestimation of sensible heat fluxes. The observed soil moisture contents are almost constant at both sites. Field photographs show the sites are located in low-lying areas, one in a local depression and the other at the bottom of a valley. Thus, it is reasonable to assume that the constant soil moisture content is maintained by lateral flow from adjacent hillslopes. This assumption could be further supported by the influence of mineral earth hummocks in TVC drainage basin. CLASS is a one-dimensional column model and it is not possible to explicitly represent lateral flow. Thus a nudging module is added to the peatland version of CLASS to reflect this horizontal water movement. Simulations were further improved with this modification. This additional module is a simple and effective way to represent the effect of lateral flow. |
author2 |
Lin, Charles A. (advisor) |
format |
Thesis |
author |
Rodgers, David G. |
author_facet |
Rodgers, David G. |
author_sort |
Rodgers, David G. |
title |
Validating Canadian land surface scheme heat fluxes under subarctic tundra conditions |
title_short |
Validating Canadian land surface scheme heat fluxes under subarctic tundra conditions |
title_full |
Validating Canadian land surface scheme heat fluxes under subarctic tundra conditions |
title_fullStr |
Validating Canadian land surface scheme heat fluxes under subarctic tundra conditions |
title_full_unstemmed |
Validating Canadian land surface scheme heat fluxes under subarctic tundra conditions |
title_sort |
validating canadian land surface scheme heat fluxes under subarctic tundra conditions |
publisher |
McGill University |
publishDate |
2002 |
url |
http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=29471 |
op_coverage |
Master of Science (Department of Atmospheric and Oceanic Sciences.) |
long_lat |
ENVELOPE(-133.415,-133.415,68.772,68.772) ENVELOPE(-138.324,-138.324,63.326,63.326) |
geographic |
Canada Trail Valley Creek Valley Creek |
geographic_facet |
Canada Trail Valley Creek Valley Creek |
genre |
permafrost Subarctic Tundra |
genre_facet |
permafrost Subarctic Tundra |
op_relation |
alephsysno: 001956722 proquestno: MQ85821 Theses scanned by UMI/ProQuest. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=29471 |
op_rights |
All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
_version_ |
1766166556042067968 |