Abstract
Over 100 measurements of particulate organic carbon (POC), particulate nitrogen (PN) and dissolved organic carbon (DOC), based on bottle collections, were made through the ice in the Arctic Ocean as part of the Canadian CESAR expedition. Despite considerable scatter at all depths, the three variables show a general decrease with depth to the bottom (2100 m). The average PN concentrations are the lowest yet reported, as are the POC concentrations in the upper 500 m. DOC concentrations are similar to other oceanic regions. There is no relationship between any variable and water mass structure. The average C:N ratio (by weight) of particulate organic material is 11.5 in the surface layer and increases with depth. Compared to data collected from other oceans, the Arctic concentrations demonstrate similar depth gradients which are steepest for PN and least for DOC. There also is a broad scale relationship between surface primary production and POC and PN concentrations throughout the water column.
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