CCGS Nahidik at the Inuvik port
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ARDEX cruise 2004
The initial sampling phase of the ARDEX work was by helicopter (July 21-26, 2004), and the second phase was
a research cruise on the CCGS Nahidik, from 26 July to 3 August 2004. 12 ARDEX scientists participated the cruise
Field sampling and experiments were undertaken to address the hypotheses that the combined effects of photobleaching
and microbial degradation of DOM in the river and marine delta environment provide a major mechanism for ventilating
Arctic soil carbon stocks into the atmosphere; that coloured DOM (CDOM) regulates primary production; that zooplankton
release DOM with a distinct fluorescence signature; that parts of this river-delta system are net sources of CO2 to
the atmosphere; and that terrestrial carbon contributes to the food web productivity of the Mackenzie River and
coastal zone.
Measurements during ARDEX included CTD and optical profiling; discrete and integrated sampling for nutrient and other
biogeochemical analyses; sampling for photodegradation experiments and DOM analysis; primary and bacterial production
measurements; pumped zooplankton sampling for CDOM experiments; zooplankton and seston sampling for food web analyses;
and pCO2 and pO2 transects via continuous and discrete sample systems.
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