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Abstract:Snow sublimation can be an important component of the snow-cover mass balance, and there is considerable interest in quantifying the role of this process within the water and energy balance of snow-covered regions. In recent years, robust eddy covariance (EC) instrumentation has been used to quantify snow sublimation over snow-covered surfaces in complex mountainous terrain. However, EC can be challenging for monitoring turbulent fluxes in snow-covered environments because of intensive data, power, and fetch requirements, and alternative methods of estimating snow sublimation are often relied upon. To evaluate the relative merits of methods for quantifying surface sublimation, fluxes calculated by the EC, Bowen ratio-energy balance (BR), bulk aerodynamic flux (BF), and aerodynamic profile (AP) methods and their associated uncertainty were compared at two forested openings in the Colorado Rocky Mountains. Biases between methods are evaluated over a range of environmental conditions, and limitations of each method are discussed. Mean surface sublimation rates from both sites ranged from 0.33 to 0.36 mm day À1 , 0.14 to 0.37 mm day À1 , 0.10 to 0.17 mm day À1 , and 0.03 to 0.10 mm day À1 for the EC, BR, BF and AP methods, respectively. The EC and/or BF methods are concluded to be superior for estimating surface sublimation in snowcovered forested openings. The surface sublimation rates quantified in this study are generally smaller in magnitude compared with previously published studies in this region and help to refine sublimation estimates for forested openings in the Colorado Rocky Mountains.
Abstract:Snow sublimation can be an important component of the snow-cover mass balance, and there is considerable interest in quantifying the role of this process within the water and energy balance of snow-covered regions. In recent years, robust eddy covariance (EC) instrumentation has been used to quantify snow sublimation over snow-covered surfaces in complex mountainous terrain. However, EC can be challenging for monitoring turbulent fluxes in snow-covered environments because of intensive data, power, and fetch requirements, and alternative methods of estimating snow sublimation are often relied upon. To evaluate the relative merits of methods for quantifying surface sublimation, fluxes calculated by the EC, Bowen ratio-energy balance (BR), bulk aerodynamic flux (BF), and aerodynamic profile (AP) methods and their associated uncertainty were compared at two forested openings in the Colorado Rocky Mountains. Biases between methods are evaluated over a range of environmental conditions, and limitations of each method are discussed. Mean surface sublimation rates from both sites ranged from 0.33 to 0.36 mm day À1 , 0.14 to 0.37 mm day À1 , 0.10 to 0.17 mm day À1 , and 0.03 to 0.10 mm day À1 for the EC, BR, BF and AP methods, respectively. The EC and/or BF methods are concluded to be superior for estimating surface sublimation in snowcovered forested openings. The surface sublimation rates quantified in this study are generally smaller in magnitude compared with previously published studies in this region and help to refine sublimation estimates for forested openings in the Colorado Rocky Mountains.
GLACIOLOGICAL LITERATURE THIS is a selected list of glaciological li tera ture on th e scientifi c study of snow a nd ice a nd of their e ffects o n the Earth; for the litera ture on pola r exp edition s, a nd a lso on th e "applied " aspec ts o f g lac iology, su ch as snow p loughs, r eaders should consult the bibli ogra phi es in each iss u e o f R ecent Polar Literalure (supplement to th e Polar R ecord). For Russ ian m a terial the system of transli teration used is tha t agreed by the U .S. Board on Geogra phic Names and th e Perman e nt Committee on Geog ra phical Names for British Official Use in 1947. R ead e rs ca n greatly ass ist by sending reprints of the ir publica tions to the Society, or by informing Dr. J. W. Gl en of publications of glaciological interest. It sh o uld be noted tha t th e Society does not n ecessaril y hold cop ies of the item s in thi , list, a nd a lso that the Socie ty does n ot possess fac ilities for mi crofilming o r photocopying. CONFERENCES KARLSSON, T., ed. Proceedings, the second international cOliference 0 11 port alld ocean engineering Illlder Arctic conditiolls.
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