GLOBAL L-BAND VEGETATION VOLUME FRACTION ESTIMATES FOR MODELINGVEGETATION OPTICAL DEPTH
2021
The attenuation of microwave emissions through the canopy
is quantified by the vegetation optical depth (VOD), which is
related to the amount of water, the biomass and the structure
of vegetation. To provide microwave-derived plant water
estimates, one must account for biomass/structure
contributions in order to extract the water component from
the VOD. This study uses Aquarius scatterometer data to
build an L-band global seasonality of vegetation volume
fraction (δ), representative of biomass/structure dynamics.
The dynamic range of δ is adapted for its application in a
gravimetric moisture (Mg) retrieval model. Results show that
δ ranging from 0 to 5·10-4 is needed for modelling physically
reasonable Mg values. The global average of δ shows
consistent spatial patterns across vegetation distributions, and
δ seasonality is coherent with the phenology of the studied
vegetation types. These findings enable the separation of
information on vegetation water and biomass/structure
inherent in the VOD.
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