Temporal increases of phosphate and apparent oxygen utilization in the subsurface waters of western subarctic Pacific from 1968 to 1998

Details Temporal increases of phosphate and apparent oxygen utilization in the subsurface waters of western subarctic Pacific from 1968 to 1998 Temporal increases of phosphate and apparent oxygen utilization in the subsurface waters of western subarctic Pacific from 1968 to 1998

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.3285o&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 17, p. 3285-3288

Other

35

Global Change: Oceans, Meteorology And Atmospheric Dynamics: Climatology, Oceanography: General: Climate And Interannual Variability, Oceanography: General: Physical And Chemical Properties Of Seawater

Scientific paper

30-years time series of AOU and phosphate in the Oyashio sub-surface domain showed an increasing trend superimposed on bidecadal oscillation. AOU and phosphate trend on isopycnals between 26.7 and 27.2 σθ increased by an average of 0.9+/-0.5 and 0.005+/-0.003μmol/kg/y, respectively. Salinity on these isopycnals also showed an average linear increase of 0.0008 psu/y. Salinity and density of winter mixed layer, on the other hand, was found to have decreased during the observation period. Observed bidecadal oscillation (average period 20+/-1 y) in subsurface AOU negatively correlated with that of North Pacific Index (r=-0.88+/-0.06). As the cause of the linear increase of subsurface phosphate and AOU, we speculated that vertical water exchange in the upper layers of the subarctic North Pacific might have been diminished during this period. A decreasing trend of salinity and density of winter mixed layer in Oyashio that was observed during the same period supported this speculation.

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