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Abstract. The 2019 Australian mega fires were unprecedentedconsidering their intensity and consistency. There has been much researchon the environmental and ecological effects of these mega fires, most ofwhich focused on the effect of huge aerosol loadings and the ecologicaldevastation. Sea land breeze (SLB) is a regional thermodynamic circulationclosely related to coastal pollution dispersion, yet few have looked into howit is influenced by different types of aerosols transported from eithernearby or remote areas. Mega fires provide an optimal scenario of largeaerosol emissions. Near the coastal site of Brisbane Archerfield duringJanuary 2020, when mega fires were the strongest, reanalysis data fromModern-Era Retrospective analysis for Research and Applications version 2(MERRA-2) showed that mega fires did release huge amounts of aerosols,making aerosol optical depth (AOD) of total aerosols, black carbon (BC) andorganic carbon (OC) approximately 240 %, 425 % and 630 % of the averagesin other non-fire years. Using 20 years' wind observations of hourly timeresolution from a global observation network managed by the National Oceanic andAtmospheric Administration (NOAA), we found that the SLB day number duringthat month was only 4, accounting for 33.3 % of the multi-years'average. The land wind (LW) speed and sea wind (SW) speed also decreased by22.3 % and 14.8 % compared with their averages respectively.Surprisingly, fire spot and fire radiative power (FRP) analysis showed thatheating effects and aerosol emission of the nearby fire spots were not the maincauses of the local SLB anomaly, while the remote transport of aerosols from thefire centre was mainly responsible for the decrease of SW, which waspartially offset by the heating effect of nearby fire spots and the warmingeffect of long-range transported BC and CO2. The large-scale coolingeffect of aerosols on sea surface temperature (SST) and the burst of BCcontributed to the slump of LW. The remote transport of total aerosols wasmainly caused by free diffusion, while the large-scale wind field played asecondary role at 500 m. The large-scale wind field played a more important rolein aerosol transport at 3 km than at 500 m, especially for the gatheredsmoke, but free diffusion remained the major contributor. The decrease ofSLB speed boosted the local accumulation of aerosols, thus making SLBspeed decrease further, forming a positive feedback mechanism.

Observed slump of sea land breeze in Brisbane under the effect of aerosols from remote transport during 2019 Australian mega fire events