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Eddy flux measurements above a pine forest
Author(s) -
Moore C. J.
Publication year - 1976
Publication title -
quarterly journal of the royal meteorological society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.744
H-Index - 143
eISSN - 1477-870X
pISSN - 0035-9009
DOI - 10.1002/qj.49710243418
Subject(s) - sensible heat , latent heat , bowen ratio , environmental science , canopy , eddy covariance , atmospheric sciences , transpiration , energy budget , pine forest , evapotranspiration , tree canopy , flux (metallurgy) , evaporation , meteorology , ecology , geography , forestry , geology , photosynthesis , ecosystem , botany , materials science , metallurgy , biology
Estimates of sensible and latent heat flux measured above a Pinus radiata forest plantation, 11km north of Mt Gambier in South Australia, by eddy‐correlation instrumentation, were found to satisfy the forest energy budget to within 20% provided the mean windspeed was greater than about 2ms −1 . In lighter winds these two fluxes were severely underestimated. A study of the higher windspeed data when the forest canopy was externally dry and transpiration the only water loss, gave a Bowen ratio of 0.8 ± 0.1 during the day, with a diurnal trend similar to that for shorter vegetation types. In these conditions the hourly change in canopy heat storage was a significant component of the energy budget. When the canopy was wet from intercepted rainfall, the Bowen ratio was generally less than 0.3 and often negative. Incoming sensible heat and a cooling canopy provided energy for evaporation when the net radiation was low or negative.