We examine the formation of shallow convective boundary layers (sCBLs) in the intertidal zones during low-tides, when basalt-rich surfaces and marine organic material are exposed to solar radiation. Low albedo (~0.1) and surface evaporation drive rapid warming, generating unstable layers 20–50 m deep, capped by a marine atmospheric boundary layer. As tides rise, the coastal surface is submerged, and the near-surface atmosphere transitions to a marine regime.

Results are based on a field campaign conducted July 21–25, 2025, at the NOAA–UAF Kasitsna Bay Laboratory, Homer, Alaska using surface measurements and unmanned aircraft systems soundings up to 120 m.