【摘 要】
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The tropospheric carbonyl sulfide (COS) distribution is determined by a range of sources and sinks that include the ocean,vegetation,soils,and industrial activity.Uncertainty remains on the magnitude
【机 构】
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University of East Anglia,Norwich,NR4 7TJ,UK;Harvard University,USA
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The tropospheric carbonyl sulfide (COS) distribution is determined by a range of sources and sinks that include the ocean,vegetation,soils,and industrial activity.Uncertainty remains on the magnitude and distribution of these fluxes.Recent atmospheric COS measurements have identified a significant degree of temporal and spatial variability,especially in the boundary layer [Montzka et al.2007].This has been ascribed to seasonal and regional variability in natural sources and sinks and the influence of atmospheric transport processes.The oceanic flux of COS makes a significant contribution to the observed atmospheric variability.This flux is a complex mix of direct COS emission and oxidation of other reduced sulphur species (e.g.,DMS and CS2 ).Here,we evaluate the influence of this source on atmospheric COS variability using a 3-D atmospheric chemical transport model (GEOS-Chem) in combination with recent best estimates of surface COS fluxes [Kettle et al.2002].Modelled patterns of seasonal and spatial variability are evaluated against COS measurements from the surface flask network of Montzka et al.[2007].The combined analysis of measurements and model COS simulations,tagged by source,is used to identify the oceanic contribution to observed atmospheric variability.Keywords: carbonyl sulphide,ocean-atmosphere fluxes.
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