Evidence of a change in oceanic fixed nitrogen with decadal climate change in the North Pacific subpolar region

Details Evidence of a change in oceanic fixed nitrogen with decadal climate change in the North Pacific subpolar region Evidence of a change in oceanic fixed nitrogen with decadal climate change in the North Pacific subpolar region

Jan 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3501602w&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 1, CiteID L01602

Mathematics

Logic

5

Oceanography: Biological And Chemical: Nutrients And Nutrient Cycling (0470, 1050), Oceanography: Biological And Chemical: Biogeochemical Cycles, Processes, And Modeling (0412, 0414, 0793, 1615, 4912), Global Change: Oceans (1616, 3305, 4215, 4513)

Scientific paper

Using four pentadecadal hydrographic time series of biogeochemical properties over the North Pacific subpolar region, we found that the linear trends of these properties over this region due to sea surface stratification. Decadal periodicity of 18 years was also found although there were the opposite phases between the eastern and western sides. Despite decreasing trends of DO with an increase of PO4, N* in the subsurface water showed an increasing trend of 0.18 μmol kg-1 y-1. N* in the surface water had also an increase of 0.12 μmol kg-1 y-1 with a decrease of Si/N. With considering the decease of N/P and increase of Si/N in diatoms under iron-deficient conditions, this finding is evidence that a shift of phytoplankton has already occurred due to the progress in stratification with the depletion of iron derived from deep water, despite being a relatively high primary production region.

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