Published online by Cambridge University Press: 27 October 2009
Biogenic emissions of sulfur from the ocean surface are believed to be a significant contribution to the atmospheric aerosol burden, thus playing a significant role in climate. The possibility exists for using remotely sensed data to locate sources, map distributions, and estimate global-scale fluxes of marine sulfur flux. By definition, estimates of surface trace-gas flux from satellites are indirect. Empirical algorithms must be derived using direct surface flux measurements. This technology does not currently exist, and may be many years from coming to fruition. This paper discusses the possibilities of developing a satellite-based dimethyl sulphide (DMS) flux capability and describes a new technique that can be used to develop the necessary empirical relationships. It demonstrates the feasibility of using a sulfur chemiluminescence detector (SCD) for measuring surface sulfur-gas flux directly from the ground. It also estimates ocean surface sulfur-gas flux using two related, indirect methods, known as the variance method and the inertial dissipation method. These methods can be used in the Arctic, where the ocean-to-atmosphere flux may be a significant fraction of global biogenic sulfur emissions.