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

[https://doi.org/10.5061/dryad.x3ffbg7tg](https://doi.org/10.5061/dryad.x3ffbg7tg)

## Description of the data and file structure

**Description of the data and file structure:**
Data products contain SWE changes calculated from NASA UAVSAR flights at Fraser Experimental Forest during the SnowEx 2021 Time Series Campaign. Two headings (052° and 233°). Dates for the 052° flights include 15–20 January, 20–27 January, 27 January to 3 February, 3–23 February, 23 February to 3 March, 3–10 March, 10–16 March, and 16–22 March. Dates for the 233° flights include 27 January to 3 February, 3–10 March, 10–16 March, and 16–22 March. Clear atmospheric phase ramps were visible for both headings of the 3–10 March unwrapped InSAR pairs and were atmospherically corrected before SWE-change calculations. These products are analysis-ready.

SWE-change products typically have a temporal baseline of 7 days, except the ...