This study presents a novel estimate for the contribution of oceanic VSLS emissions to the atmospheric boundary layer and free troposphere during the SHIVA-Sonne
cruise in the South China and Sulu seas in 2011. While oceanic emissions of CHBr3
I showed a significant contribution to their atmospheric abundances, atmospheric CH2
appeared to be largely advected. Convective activity in the region can furthermore lead to low VSLS boundary layer mixing ratios despite high oceanic emissions.