Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 40, Issue 20, Pages 5467-5472Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2013GL058171
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Funding
- UK Natural Environmental Research Council
- NERC [NE/F002858/1] Funding Source: UKRI
- Natural Environment Research Council [NE/F002858/1, noc010012] Funding Source: researchfish
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Shelf seas are an important global carbon sink. In the seasonal thermocline, the subsurface chlorophyll maximum (SCM) supports almost half of summer shelf production. Using observations from the seasonally stratified Celtic Sea (June 2010), we identify wind-driven inertial oscillations as a mechanism for supplying the SCM with the nitrate needed for phytoplankton growth and carbon fixation. Analysis of wind, currents, and turbulent dissipation indicates that inertial oscillations are triggered by a change in the wind velocity. High magnitude, short-lived dissipation spikes occur when the shear and wind vectors align, increasing the daily nitrate flux to the SCM by a factor of at least 17. However, it is likely that the sampling resolution of turbulent dissipation does not always capture the maximum wind-driven peak in mixing. We estimate that wind-driven inertial oscillations supply the SCM with similar to 33% to 71% of the nitrate required for new production in shelf seas during summer.
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