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... 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±0.003 µmol/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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Geophysical Research Letters Wiley

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

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Publisher
Wiley
Copyright
© 2001 by the Chinese Geophysical Society
ISSN
0094-8276
eISSN
1944-8007
DOI
10.1029/2001GL012948
Publisher site
See Article on Publisher Site

Abstract

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±0.003 µmol/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.

Journal

Geophysical Research LettersWiley

Published: Sep 1, 2001

References

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