The ocean-atmosphere cycles of methyl halide trace gases in the Southern Ocean and Tasmanian coastal waters ...

• Main Author: Grose, MR
• Format: Thesis
• Language: unknown
• Published: University Of Tasmania 2023
• Subjects: Grim; Southern Ocean
• Online Access: https://dx.doi.org/10.25959/23232137.v1; https://figshare.utas.edu.au/articles/thesis/The_ocean-atmosphere_cycles_of_methyl_halide_trace_gases_in_the_Southern_Ocean_and_Tasmanian_coastal_waters/23232137/1

The trace gases methyl bromide and methyl iodide are important vectors for the transport of halogens from the ocean to the atmosphere. The halogens play roles in atmospheric reactions including catalytic ozone destruction and iodine has a role in the formation of new particles. The oceans are a large source and sink of the methyl halide gases and there are known biological and photochemical sources in the surface ocean. However the ocean-atmosphere cycle and the variables controlling production are still quite poorly understood. This study investigates the marine sources and sinks of marine methyl halides, particularly the biogenic source in the open ocean, coastal and inshore waters, in the region of the Cape Grim Baseline Air Pollution Station, Tasmania, in the period 2003 to 2007. Methyl halide concentrations measured at Cape Grim under the Advanced Global Atmospheric Gas Experiment are made under all conditions, but this study focuses on the measurements made in baseline air that originates over the ...