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Estimating sublimation of intercepted and sub‐canopy snow using eddy covariance systems
Author(s) -
Molotch Noah P.,
Blanken Peter D.,
Williams Mark W.,
Turnipseed Andrew A.,
Monson Russell K.,
Margulis Steven A.
Publication year - 2007
Publication title -
hydrological processes
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.222
H-Index - 161
eISSN - 1099-1085
pISSN - 0885-6087
DOI - 10.1002/hyp.6719
Subject(s) - snowpack , snow , sublimation (psychology) , canopy , eddy covariance , environmental science , atmospheric sciences , latent heat , snowmelt , sensible heat , water vapor , humidity , hydrology (agriculture) , meteorology , ecosystem , geology , ecology , geography , psychology , geotechnical engineering , psychotherapist , biology
Direct measurements of winter water loss due to sublimation were made in a sub‐alpine forest in the Rocky Mountains of Colorado. Above‐and below‐canopy eddy covariance systems indicated substantial losses of winter‐season snow accumulation in the form of snowpack (0·41 mm d −1 ) and intercepted snow (0·71 mm d −1 ) sublimation. The partitioning between these over and under story components of water loss was highly dependent on atmospheric conditions and near‐surface conditions at and below the snow/atmosphere interface. High above‐canopy sensible heat fluxes lead to strong temperature gradients between vegetation and the snow‐surface, driving substantial specific humidity gradients at the snow surface and high sublimation rates. Intercepted snowfall resulted in rapid response of above‐canopy latent heat fluxes, high within‐canopy sublimation rates (maximum = 3·7 mm d −1 ), and diminished sub‐canopy snowpack sublimation. These results indicate that sublimation losses from the sub‐canopy snowpack are strongly dependent on the partitioning of sensible and latent heat fluxes in the canopy. This compels comprehensive studies of snow sublimation in forested regions that integrate sub‐canopy and over‐story processes. Copyright © 2007 John Wiley & Sons, Ltd.