L-band InSAR snow water equivalent retrievals over Fraser Experimental Forest, Colorado

The Fraser Experimental Forest, CO was one of seven sites in 2021 that received NASA UAVSAR flights during the SnowEx Time Series Campaign. Two flight headings (052° and 233°) were flown. Eight InSAR pairs were collected from 15 January to 22 March, with a typical temporal baseline of 7 days from the 052° heading, whereas the 233° heading saw fewer flights during the same interval (four InSAR pairs collected). This dataset contains the calculated changes in SWE for each InSAR pair following Guneriussen et al. (2001).

Methods
Detailed methods are available in the main manuscript submitted to GRL. Generally, changes in SWE were calculated following the density-dependent method outlined by Guneriussen et al. (2001). This method calculates SWE change from the unwrapped InSAR phase (provided by UAVSAR unwrapped interferograms), local incidence angles, relative permittivity, and surface snow density. We calculated incidence angles from the available lidar DEM (Adebisi et al., 2022). Relative permittivities and densities were obtained from snow pits archived by Mason et al. (2024), where relative permittivity was calculated from the upper 10 cm densities of the available snow pits following Kovacs et al. (1995). For each InSAR pair, we calibrated the phase by estimating the phase change from the SWE change, which was documented by a snow pit in a high-coherence area.gr