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Sensible heat flux estimation by flux variance and half‐order time derivative methods
Author(s) -
Wesson Karen H.,
Katul Gabriel,
Lai ChunTa
Publication year - 2001
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/2001wr900021
Subject(s) - sensible heat , flux (metallurgy) , eddy covariance , environmental science , atmospheric sciences , heat flux , variance (accounting) , meteorology , derivative (finance) , mechanics , heat transfer , materials science , physics , financial economics , economics , metallurgy , ecology , business , accounting , ecosystem , biology
This study is the first to contrast two similarity theory methods, the flux variance and the half‐order time derivative, over a wide range of atmospheric stability and surface roughness conditions. These two methods were selected because they require only single‐level temperature measurement to estimate sensible heat flux. The data used were collected over bare soil, a grass‐covered forest clearing, and an even‐aged pine forest. For all three sites the flux variance method estimated the sensible heat flux relatively well for unstable atmospheric conditions. The half‐order time derivative method was found to be sensitive to the parameterization of the eddy diffusivity, especially for the grass and bare soil field sites. Overall, the flux variance method was able to reproduce the measured sensible heat flux with greater accuracy than the half‐order time derivative methods for the three experiment sites.