Palau FTIR Tropospheric Ozone Column (0.2–10.2 km), Sep–Oct 2022 (v1.0)

This dataset provides ground-based Fourier-transform infrared (FTIR) observations of tropospheric ozone over Palau (7.3°N, 134.5°E) during September–October 2022, retrieved using the **SFIT-4** algorithm. The main product is the dry-air partial column-averaged mixing ratio of ozone (O₃) in the 0.2–10.2 km altitude range, representing the lower-tropospheric column (TOC). Auxiliary variables such as averaging kernels (AVK), solar zenith angles (SZA), and degrees of freedom for signal (DOFS) are provided to allow averaging-kernel-consistent model or satellite comparisons. This dataset was used in the study: > Sun, X. et al. (2025), “Tropospheric Low Ozone and Its Diurnal Cycle over the Western Pacific Warm Pool from Solar Absorption FTIR observations.”