Datenpaket: Research data for "Dry intrusion connects high-impact cyclones Eunice and Franklin: emerging observational targets of NAWDIC"

This archive contains "Dry Intrusion" trajectories presented in the manuscript "Dry intrusion connects high-impact cyclones Eunice and Franklin: emerging observational targets of NAWDIC" published in the Bulletin of the American Meteorological Society, 2026 (https://doi.org/10.1175/BAMS-D-25-0170.1).

All trajectories fulfill the Dry Intrusion criterion of 400 hPa descent in 48 h (Raveh-Rubin 2017). The kinematic forward and backward trajectories are calculated from 3-hourly ERA5 reanalysis data (Hersbach et al. 2020) on a regular latitude-longitude grid of 0.5×0.5° on all available model levels using the Lagrangian Analysis Tool (Lagranto; Sprenger and Wernli 2015).
Trajectories are started at 12 UTC on 16 February, 2022, and calculated 48 h backward as well as 120 h forward, i.e., trajectories cover the time period from 12 UTC on 14 February to 12 UTC on 21 February.
In addition to time relative to trajectory start (time, in hours), longitude (lon, in °E), latitude (lat, in °N), and pressure (p, in hPa), several meteorological variables are provided. These include specific humidity (Q, in g/kg), potential temperature (TH, in K), potential vorticity (PV, in PVU), relative humidity (RH, in %), surface sensible and latent heat fluxes (SSHF and SLHF, in W/m2), and velocity (VEL, m/s).

References:
Hersbach, H., and Coauthors, 2020: The ERA5 global reanalysis. Quarterly Journal of the Royal Meteorological Society, 146, 1999–2049, https://doi.org/10.1002/qj.3803.
Raveh-Rubin, S., 2017: Dry intrusions: Lagrangian climatology and dynamical impact on the planetary boundary layer. Journal of Climate, 30, 6661–6682, https://doi.org/10.1175/JCLI-D-16-0782.1.
Sprenger, M., and H. Wernli, 2015: The LAGRANTO Lagrangian analysis tool – version 2.0. Geoscientific Model Development, 8, 2569–2586, https://doi.org/10.5194/gmd-8-2569-2015.