Abstract

Variability in the gross primary product (GPP) algorithm derived from the Moderate Resolution Imaging Spectroradiometer (MODIS) is examined and compared with the same algorithm adjusted according to vegetation height influences on the light use efficiency (LUE) term within a section of the White Gull watershed, Saskatchewan Canada. GPP comparisons are made for pixels containing vegetation heights of 0 to 1m, 1 to 3m, 8 to 12m, and 12 to 24m. The results of this study find that the LUE term has an important influence on satellite derived GPP. MODIS typically overestimates GPP at sites containing short vegetation up to 3 m, and underestimates GPP at sites containing taller vegetation, compared with GPP derived from eddy covariance and that adjusted for LUE.

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