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Article << Previous     |     Next >>   Contents Vol 56(1)

The influence of coral reefs on atmospheric dimethylsulphide over the Great Barrier Reef, Coral Sea, Gulf of Papua and Solomon and Bismarck Seas

Graham B. Jones A C, Anne J. Trevena B

A Centre for Coastal Management, School of Environmental Science & Management, Southern Cross University, Lismore, NSW 2480, Australia.
B Glaciology Unit, Department of Earth and Environmental Sciences, Universite Libre de Bruxelles, CP 160/03, 50, av. F.D. Roosevelt, 1050 – Bruxelles, Belgium.
C Corresponding author. Email: gjones@scu.edu.au
 
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Abstract

Marked regional differences in dissolved dimethylsulphide (DMS), atmospheric DMS and DMS flux were recorded during July 1997 through the northern Great Barrier Reef, Coral Sea, Gulf of Papua, Solomon and Bismarck Seas. Highest concentrations of dissolved DMS occurred in the Coral Sea, Gulf of Papua and Bismarck Sea, with lower concentrations in the Great Barrier Reef and Solomon Sea. Elevated levels of atmospheric DMS often occurred in south-easterly to southerly trade winds sampled in the region 18°32′–8°12′S to 145°–151°E, where the highest biomass of coral reefs occurred. Atmospheric DMS often increased in the day after low tides and was positively correlated with tidal height in the northern Great Barrier Reef (r = 0.91, P < 0.05). For tides less than 1.6 m, atmospheric DMS increased on the rising tide for the northern GBR and NW Coral Sea (r = 0.66; P < 0.05) and for the whole voyage (r = 0.25; P < 0.05). As coral reefs have been identified as significant sources of DMS, it is suggested that the daytime increase in atmospheric DMS over much of the study area was mainly a result of high winds and extremely low tides in July, which exposed the reefs during the day.

Keywords: atmospheric DMS, dimethylsulphoniopropionate (DMSP), DMS flux.


   
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