Abstract
Near global 85∘ S–85∘ N atmospheric measurement of carbonyl sulfide (OCS), including the minor OC34S and O13CS isotopologues, were made by the Atmospheric Chemistry Experiment Fourier transform spectrometer (ACE-FTS) in low Earth orbit. ACE-FTS data provide volume mixing ratio (VMR) profiles of OCS, OC34S and O13CS from 8 km in troposphere up to 31 km in the stratosphere. The global zonal and seasonal distributions of OCS isotopologues were studied. OCS observations made with the MkIV balloon-borne Fourier transform spectrometer (FTS) are also presented. The results indicate a slight enrichment of OC34S and a significant enrichment of O13CS as the altitude increases. The contribution of OCS to the background Stratospheric Sulfate Aerosol Layer (SSA) is discussed and ACE-FTS data indicate that OCS is a major contributor.
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