Interactive lakes in the Canadian Regional Climate Model, version 5: the role of lakes in the regional climate of North America

Martynov, Andrey; Sushama, Laxmi; Laprise, René; Winger, Katja et Dugas, Bernard (2012). « Interactive lakes in the Canadian Regional Climate Model, version 5: the role of lakes in the regional climate of North America ». Tellus A, 64(16226).

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Résumé

Two one-dimensional (1-D) column lake models have been coupled interactively with a developmental version of the Canadian Regional Climate Model. Multidecadal reanalyses-driven simulations with and without lakes revealed the systematic biases of the model and the impact of lakes on the simulated North American climate. The presence of lakes strongly influences the climate of the lake-rich region of the Canadian Shield. Due to their large thermal inertia, lakes act to dampen the diurnal and seasonal cycle of low-level air temperature. In late autumn and winter, ice-free lakes induce large sensible and latent heat fluxes, resulting in a strong enhancement of precipitation downstream of the Laurentian Great Lakes, which is referred to as the snow belt. The FLake (FL) and Hostetler (HL) lake models perform adequately for small subgrid-scale lakes and for large resolved lakes with shallow depth, located in temperate or warm climatic regions. Both lake models exhibit specific strengths and weaknesses. For example, HL simulates too rapid spring warming and too warm surface temperature, especially in large and deep lakes; FL tends to damp the diurnal cycle of surface temperature. An adaptation of 1-D lake models might be required for an adequate simulation of large and deep lakes.

Type:	Article de revue scientifique
Mots-clés ou Sujets:	Regional climate modelling, lake model, coupling, advanced surface parameterization
Unité d'appartenance:	Centres institutionnels > Centre pour l'étude et la simulation du climat à l'échelle régionale (ESCER) Faculté des sciences > Département des sciences de la Terre et de l'atmosphère
Déposé par:	René Laprise
Date de dépôt:	01 avr. 2016 18:46
Dernière modification:	19 avr. 2016 18:17
Adresse URL :	http://archipel.uqam.ca/id/eprint/8066

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