Ajoku, O., J. R. Norris and A. J. Miller, 2019:
Observed impact of smoke aerosols on the Stratocumulus-to-Cumulus Transition in the equatorial Atlantic.
Geophysical Research Letters, sub judice.
The impact of smoke aerosols on the stratocumulus-to-cumulus transition (SCT) in the equatorial Atlantic is studied 15 using observation-based data for the month of June. Boundary layer deepening and increasing sea surface 16 temperatures put the location of the SCT within the Gulf of Guinea. Satellite retrievals indicate that the bulk of 17 aerosols occurs at 1500m in altitude, either above or below the boundary layer depending on latitudinal position. 18 Changes in smoke loading over the Gulf of Guinea due to greater transport from regions of biomass burning leads to 19 increased low-level cloud cover and lower surface temperatures when aerosol optical depth anomalies exceed 0.1. 20 Similar results opposite in sign are obtained during lesser transport. Further south, we find significant changes to 21 cloud top height, tropospheric stability and moisture availability. These effects combine to alter the SCT during 22 increased loading, which is consistent with previous modeling studies.