Title

Assessing interannual variation in MODIS-based estimates of gross primary production

Document Type

Article

Publication Title

IEEE Transactions on Geoscience and Remote Sensing

Publication Date

7-2006

Volume

44

Issue

7

First Page

1899

Last Page

1907

Abstract

Global estimates of terrestrial gross primary production (GPP) are now operationally produced from Moderate Resolution Imaging Spectrometer (MODIS) imagery at the 1-km spatial resolution and eight-day temporal resolution. In this study, MODIS GPP products were compared with ground-based GPP estimates over multiple years at three sites-a boreal conifer forest, a temperate deciduous forest, and a desert grassland. The ground-based estimates relied on measurements at eddy covariance flux towers, fine resolution remote sensing, and modeling. The MODIS GPP showed seasonal variation that was generally consistent with the in situ observations. The sign and magnitude of year-to-year variation in the MODIS products agreed with that of the ground observations at two of the three sites. Examination of the inputs to the MODIS GPP algorithm-notably the fraction of photosynthetically active radiation (FPAR) that is absorbed by the canopy), minimum temperature scalar, and vapor pressure deficit scalar-provided explanations for cases of disagreement between the MODIS and ground-based GPP estimates. Continued evaluation of interannual variation in MODIS products and related climate variables will aid in assessing potential biospheric feedbacks to climate change.

Keywords

FPAR, global ecology, GPP, interannual variation, modeling, MODIS, Remote sensing

DOI

http://dx.doi.org/10.1109/TGRS.2006.876027

Rights

© 2006 IEEE

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