Diurnal rainfall offshore propagation (OP) shapes the timing and intensity of coastal rainfall and thus impacts both nature and society. Previous OP studies have rarely compared various coasts, and a consensus regarding physical mechanisms has not been reached on a global scale. Here, we provide the global climatology of observed OP, which propagates across ~78% of all coasts and accounts for ~59% of the coastal precipitation. Generally, OP is facilitated by low latitudes, high moisture conditions and offshore background winds. OP at low latitudes in a high-moisture environment is mainly caused by inertia-gravity waves due to the land-sea thermal contrast, whereas OP at higher latitudes is significantly influenced by background winds under trapped land-sea breeze circulation conditions. Slower near-shore OP might be modulated by density currents. Our results provide a guide for global OP hotspots and suggest relative contributions of mechanisms from a statistical perspective.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9718862 | PMC |
| http://dx.doi.org/10.1038/s41467-022-34842-0 | DOI Listing |
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