Average wet canopy evaporation for a Sitka spruce forest derived using the eddy correlation-energy balance technique

C. van der Tol, J.H.C. Gash, S.J. Grant, D.D. McNeil, M. Robinson

Research output: Contribution to journalArticleAcademicpeer-review

39 Citations (Scopus)

Abstract

Hourly measurements of evaporation of intercepted rainfall were made for six months in a Sitka spruce forest in Central Wales (UK) with an eddy-correlation system. Sensible heat flux was measured with a three-dimensional sonic anemometer mounted on a mast above the forest, and evaporation was solved as the residual in the energy balance equation. Hourly evaporation was also estimated with the Penman–Monteith equation, using the eddy-correlation measurements to estimate the aerodynamic conductance. Wind direction dependent differences in surface roughness caused the aerodynamic conductance to vary from 0.09 to 0.29 m s−1 at the average wind speed. Average measured (0.12 mm h−1) and estimated (0.09 mm h−1) wet canopy evaporation rates agreed reasonably well with a previously estimated Penman–Monteith value of 0.13 mm h−1 for the same forest [J. Hydrol. 48 (1980) 89].
Original languageEnglish
Pages (from-to)12-19
JournalJournal of hydrology
Volume276
Issue number1-4
DOIs
Publication statusPublished - 2003

Keywords

  • WRS
  • ADLIB-ART-2258
  • n/a OA procedure

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