02 April 2004

Friday, 2 April 2004

Dissolved dimethylsulphide (DMS) is being determined onboard by Associate Professor Graham Jones (Southern Cross University, Australia), Mike Harvey and John McGregor (NIWA), and Hilton Swan (Australian Government Analytical Laboratories, Sydney). A measurement is being made every 14 minutes and this data with sea surface temperature and wind speed measurements will be used to calculate the flux of DMS as Tangaroa samples in and out of the patch. Wind speed has varied markedly during this voyage and seems to have affected not only the biological response and supply of DMS to the surface ocean, but has also stripped the surface ocean of DMS. Comparison of DMS flux measurements using the equations derived by Liss and Merlivat with flux measurements using the relaxed eddy accumulation (REA) technique developed at NIWA by Mike Harvey and Murray Smith will also be made on the results of this voyage.

In addition CTD samples of “in patch” and “out of patch” seawater has been processed for phytoplankton pigment measurements by Dr Simon Wright of the Australian Antarctic Division.

Graham Jones (Southern Cross University, Australia)

Associate Professor Graham Jones with the automatic underway dissolved DMS analyser used onboard Tangaroa.

Research subject: Oceans