Honors College Thesis

 

Characterization and spatial distribution of particulate organic matter in the Arctic Ocean Public Deposited

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https://ir.library.oregonstate.edu/concern/honors_college_theses/c821gm657

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  • Water samples from the Arctic Ocean were analyzed in order to assess the present nature of particulate organic matter and investigate the effect of climate-driven changes on the ecology of the region. 661 individual surface water samples and 216 samples from CTD casts were collected from the Bering, Chukchi, and Beaufort seas during USCGS Healy’s cruise in October 2012 (HLY1203). These samples were analyzed for particulate organic carbon and particulate nitrogen contents to spatially map the distribution of organic matter present in these waters at this time. The concentrations measured reveal differing amounts of organic material in the separate seas and are consistent with contrasting levels of productivity associated with different degrees of water column stratification. Comparison with optical data indicates variation in particle compositions, suggesting a variety of carbon sources. Finally, these measurements have the potential to assess changes in the carbon cycle and the dynamics organic matter in Arctic waters under rapidly changing conditions associated with climate change. Key Words: Arctic Ocean, particulate organic matter, beam attenuation, chlorophyll, primary production, climate change
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