SMAPVEX19-21 Massachusetts Vegetation Optical Depth, Version 1

This record is for the dataset "SMAPVEX19-21 Massachusetts Vegetation Optical Depth, Version 1” at doi.org/10.5067/2PZJDURUJLWF This was an experiment to study the sensitivity of L-band Vegetation Optical Depth (VOD) to changing vegetation water potential over a growing season. As part of the SMAPVEX19-21 campaign, an L-band radiometer was deployed atop a tower in the Harvard Forest, in Petersham, Massachusetts, looking down upon a stand of red oak.

Additional instruments were installed within the radiometer's field of view to measure soil moisture and temperature, air temperature, tree xylem apparent dielectric permittivity at 70 MHz, tree xylem water potential, and canopy wetness throughout the same time frame. The radiometer collected data in V-polarization from late April to mid-October 2019. Also, over four days in early July 2019, the water potential and L-band complex dielectric constant of canopy leaves were measured at various times of day.