Data from: Limited source-sink connections shape south western Pacific coral reef resilience under current and future warming

This script implements a stochastic Lagrangian particle tracking model to
simulate coral larval dispersal across 850 reefs in the southwestern
Pacific (17–32°S, 149–168°E), encompassing the southern Great Barrier
Reef, Lord Howe Island, New Caledonia, and the Coral Sea. Larval
trajectories are driven by daily oceanographic current data from BRAN2020
(u, v velocity fields), with survival probabilities modulated by sea
surface temperature and salinity using Gaussian penalty functions. A
stochastic random walk component (factor = 0.2) is added to velocity
fields to account for sub-grid turbulent diffusion. Larvae are tracked
over species-specific pelagic larval durations, with settlement occurring
when a larva passes within one kilometre of a reef following a
pre-competency period. The model outputs daily larval trajectories and a
reef-to-reef connectivity matrix quantifying successful dispersal events
between source and sink reefs across the 13-year simulation period
(2011–2024).