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Biological production in the NE Pacific and its influence on air-sea CO2 flux: Evidence from dissolved oxygen isotopes and O2/Ar

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https://ir.library.oregonstate.edu/concern/articles/1j92g8835

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  • We determine rates of gross photosynthetic O₂ production (GOP) and net community O₂ production (NCP) using the triple oxygen isotope and O₂/Ar approach on two spring and two late summer meridional transects of the NE Pacific. Observed GOP and NCP in the subtropical (89 ± 9 and 8.3 ± 1.3 mmol O₂ m⁻² d⁻¹, respectively) and subarctic (193 ± 16 and 16.3 ± 3.8 mmol O₂ m⁻² d⁻¹) were in agreement with rates previously determined at time series stations in each region, validating the regional representativeness of these sites. At the transition zone chlorophyll front (TZCF), which migrates seasonally from 32°N in spring to 40°N in summer, GOP and NCP were elevated by 2-4x compared to adjacent areas. Coincident with the TZCF, increases in surface nitrate concentration and extensive changes in phytoplankton community composition were observed. HPLC pigment data indicated substantial increases in a prymnesiophyte (e. g., coccolithophore) biomarker at the TZCF on a spring and summer cruise, and a diatom biomarker on the spring cruise. Increases in remotely sensed surface particulate inorganic carbon concentration were also observed at the TZCF on all four cruises, indicating that coccolithophore production may contribute to increased productivity at the TZCF. Meridional trends in observed air-sea CO₂ flux on each cruise resembled those of the biologically induced CO₂ flux (NCP), but with an overprinting of the response of air-sea CO₂ exchange to summer warming. A simple carbon budget based on regional CO₂ flux climatology demonstrates the importance of NCP for net annual air-sea CO₂ uptake, although slow air-sea equilibration and seasonal solubility effects obscure this term.
  • Keywords: Zone chlorophyll front, Open ocean, Ecosystem dynamics, Inlet mass spectrometry, Aquatic gross production, Community production, Subarctic Pacific, North Pacific, Subtropical gyre, Note consistent calculation
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  • Juranek, L. W., P. D. Quay, R. A. Feely, D. Lockwood, D. M. Karl, and M. J. Church (2012), Biological production in the NE Pacific and its influence on air-sea CO2 flux: Evidence from dissolved oxygen isotopes and O2 /Ar, Journal Geophysical Research, 117, C05022, doi:10.1029/2011JC007450.
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  • 117
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  • C5
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  • This work was supported by a NASA ESS Graduate Fellowship and NOAA GCCNA10OAR4310090 (LWJ) and was funded in part by National Science Foundation grant EF-0424599 and the Gordon and Betty Moore Foundation (DMK). This work was also partially funded by the Joint Institute for the Study of Atmosphere and Ocean (JISAO) under NOAA Cooperative agreements NA17RJ1232 and NA10OAR4320148, contribution 1878, and NOAA PMEL contribution 3726.
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