Record Details
Biological production in the NE Pacific and its influence on air-sea CO2 flux: Evidence from dissolved oxygen isotopes and O2/Ar
ScholarsArchive at Oregon State University
| Field | Value |
|---|---|
| Title | Biological production in the NE Pacific and its influence on air-sea CO2 flux: Evidence from dissolved oxygen isotopes and O2/Ar |
| Names |
Juranek, L. W.
(creator) Quay, P. D. (creator) Feely, R. A. (creator) Lockwood, D. (creator) Karl, D. M. (creator) Church, M. J. (creator) |
| Date Issued | 2012-05-15 (iso8601) |
| Note | To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The published article is copyrighted by the American Geophysical Union and can be found at: http://www.agu.org/journals/jgr/. |
| Abstract | 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. |
| Genre | Article |
| Topic | Sub arctic Pacific |
| Identifier | 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. |
