Primary production by phytoplankton in the Canada Basin, 2009

The primary productivity of phytoplankton was somewhat lower in the Canada Basin during the cruise period in 2009 compared to other regions in the Arctic Ocean. The averaged hourly primary production rate vertically integrated from 100% to 1% light depth was 1 mg C m-2 h-1 from this cruise. The production rates were not significant different depending on different sea ice concentrations (50%).

The light and nutrient enrichments induced higher primary productivity of the phytoplankton in the chlorophyll a maximum layer. The increases of primary productivity at the stations with 50% ice cover. This is probably because the phytoplankton at the stations with the higher ice cover was more shade-adapted and thus slower response on the light enrichments. 1) Quantification of Primary production of phytoplankton and Physical • Chemical environmental conditions in the Canada Basin 2) The effect of light and nutrient on the primary production of phytoplankton in the Chl a maximum layer