IsabelleNadeauRousseauEtAl2015

Reference

Isabelle, P.-E., Nadeau, D.F., Rousseau, A.N., Coursolle, C., Margolis, H.A. (2015) Applicability of the bulk-transfer approach to estimate evapotranspiration from Boreal Peatlands. Journal of Hydrometeorology, 16(4):1521-1539. (Scopus )

Abstract

In northern landscapes, peatlands are widespread and their hydrological processes are complex. Furthermore, they are typically remote, limiting the amount and accuracy of in situmeasurements. This is especially the case for evapotranspiration ET, which strongly influences watershed hydrology. The objective of this paper is to demonstrate the validity of the bulk-transfer approach to estimate ET over boreal peatlands. The simplicity of the model relies on four assumptions: (i) near-neutral atmospheric conditions; (ii) wet surface; (iii) constant momentum roughness length depending on vegetation height; and (iv) constant water vapor roughness length, with the last two assumptions implying a constant water vapor transfer coefficient C<inf>E</inf>. Using eddy covariance data from three Canadian peatlands-Necopastic (James Bay, Québec),Mer Bleue (Ottawa, Ontario), and Western Peatland (Athabasca, Alberta)-this paper shows that these sites are characterized by frequent occurrences of near-neutral atmospheric conditions, especially theNecopastic site, with nearly 76% of the 30-min data segments occurring under near-neutral stratification.The analysis suggests these near-neutral conditions occur as a result of strong mechanical turbulence and weak buoyancy effects. The bulk-transfer approach gives promising results for 30-min and daily ET in terms of mean error and correlation, with performances similar to the Penman equation, without requiring net radiation data. The accuracy of the approach is likely related to the number of near-neutral periods and the elevated position of the water table, which backs up the wet surface assumption. © 2015 American Meteorological Society.

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@ARTICLE { IsabelleNadeauRousseauEtAl2015,
    AUTHOR = { Isabelle, P.-E. and Nadeau, D.F. and Rousseau, A.N. and Coursolle, C. and Margolis, H.A. },
    TITLE = { Applicability of the bulk-transfer approach to estimate evapotranspiration from Boreal Peatlands },
    JOURNAL = { Journal of Hydrometeorology },
    YEAR = { 2015 },
    VOLUME = { 16 },
    PAGES = { 1521-1539 },
    NUMBER = { 4 },
    NOTE = { cited By 0 },
    ABSTRACT = { In northern landscapes, peatlands are widespread and their hydrological processes are complex. Furthermore, they are typically remote, limiting the amount and accuracy of in situmeasurements. This is especially the case for evapotranspiration ET, which strongly influences watershed hydrology. The objective of this paper is to demonstrate the validity of the bulk-transfer approach to estimate ET over boreal peatlands. The simplicity of the model relies on four assumptions: (i) near-neutral atmospheric conditions; (ii) wet surface; (iii) constant momentum roughness length depending on vegetation height; and (iv) constant water vapor roughness length, with the last two assumptions implying a constant water vapor transfer coefficient C<inf>E</inf>. Using eddy covariance data from three Canadian peatlands-Necopastic (James Bay, Québec),Mer Bleue (Ottawa, Ontario), and Western Peatland (Athabasca, Alberta)-this paper shows that these sites are characterized by frequent occurrences of near-neutral atmospheric conditions, especially theNecopastic site, with nearly 76% of the 30-min data segments occurring under near-neutral stratification.The analysis suggests these near-neutral conditions occur as a result of strong mechanical turbulence and weak buoyancy effects. The bulk-transfer approach gives promising results for 30-min and daily ET in terms of mean error and correlation, with performances similar to the Penman equation, without requiring net radiation data. The accuracy of the approach is likely related to the number of near-neutral periods and the elevated position of the water table, which backs up the wet surface assumption. © 2015 American Meteorological Society. },
    AUTHOR_KEYWORDS = { Atmosphere-land interaction; Boreal meteorology; Heat budgets/fluxes; In situ atmospheric observations; Model evaluation/performance; Stability },
    DOCUMENT_TYPE = { Article },
    DOI = { 10.1175/JHM-D-14-0171.1 },
    KEYWORDS = { atmosphere-biosphere interaction; evapotranspiration; heat budget; heat flux; model validation; peatland; water table; water vapor, Canada; James Bay; Mer Bleue; Ontario [Canada] },
    SOURCE = { Scopus },
    URL = { http://www.scopus.com/inward/record.url?eid=2-s2.0-84941273045&partnerID=40&md5=5442408edca0196736fffe031359b0ef },
}

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