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Two Hiden HPR-40 DSA Membrane Inlet Mass Spectrometer systems have been located on a ship in the West Antarctic Peninsula region to examine the seasonal cycle of biologically produced gases in surface waters.

HPR-40 ship

The systems were used to detect and analyse low level concentrations of DMS in British Columbian water (Dimethylsulphide, a trace substance implicated in global climate change and regulation). The first system was being used with a membrane inlet to continuously sample seawater delivered from an in situ pump. The second instrument was used with a home made capillary inlet to measure concentrations of isotopically labelled sulphur species in tracer experiments looking at production and consumption of dimethylsulfide.

HPR-40 on board

The HPR-40 systems were configured with a triple filter QMS provides detection levels into the parts per trillion (ppt) range corresponding to dilute DMS levels of ≤1nmol/L

Lizzy Asher, a PhD Student at the University of British Columbia who works with Philippe Tortell, has a blog detailing her activities. Click here to read Lizzy’s Blog.

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[Ref: Influence of regional climate forcing on surface water pCO2, DO2 /Ar and dimethylsulfide (DMS) along the southern British Columbia coast. PD Tortell, A Merzouk, D Ianson, R Pawlowicz and D Yelland 2012 Continental Shelf Research 47 119–132]