Merged fronts for Australian subregions

These netCDF files have the 6-hourly merged fronts for southeastern (30-40S, 15-150E) and southwestern (23-38S, 110-120E) Australia,as described and used for extracting composite data in Pepler and Rudeva (2022). This dataset is based on the Simmonds et al.(2012)/Rudeva and Simmonds (2015) tracking, as applied to the ERA5 reanalysis. Each netCDF file includes only 6-hourly data for times between 1979-2019 when there was at least one front identified in the domain of interest. For each front, front_longitude(time,lat) indicates the longitude used for the combined front at each latitude between 20 and 50S. front_vdiff(time,lat) includes the corresponding front intensity, with NaNs indicating latitudes for which no front was identified using the tracking software. References: Pepler, A. and Rudeva, I. (2022). Anomalous subtropical zonal winds drive decreases in southern Australian frontal rain. Submitted to Weather and Climate Dynamics Rudeva, I., & Simmonds, I. (2015). Variability and trends of global atmospheric frontal activity and links with large-scale modes of variability. Journal of Climate, 28(8), 3311–3330. https://doi.org/10.1175/JCLI-D-14-00458.1 Simmonds, I., Keay, K., & Bye, J. A. T. (2012). Identification and climatology of Southern Hemisphere mobile fronts in a modern reanalysis. Journal of Climate, 25(6), 1945–1962. https://doi.org/10.1175/JCLI-D-11-00100.1