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- W4241006445 abstract "Abstract. We present estimates of mixed layer net community oxygen production (N) and gross oxygen production (G) of the Bellingshausen Sea in March and April 2007. N was derived from oxygen-to-argon (O2 / Ar) ratios; G was derived using the dual-delta method from triple oxygen isotope measurements. In addition, O2 profiles were collected at 253 CTD stations. N is often approximated by the biological oxygen air-sea exchange flux (Fbio) based on the O2 / Ar supersaturation, assuming that significant horizontal or vertical fluxes are absent. Here, we show that the effect of vertical fluxes alone can account for Fbio values < 0 in large parts of the Bellingshausen Sea towards the end of the productive season, which could be mistaken to represent net heterotrophy. Thus, improved estimates of mixed-layer N can be derived from the sum of Fbio, Fe (entrainment from the upper thermocline during mixed-layer deepening) and Fv (diapycnal eddy diffusion across the base of the mixed layer). In the Winter Sea Ice Zone (WSIZ), the corresponding correction results in a small change of Fbio= (30 ± 17) mmol m−2 d−1 to N= (34 ± 17) mmol m−2 d−1. However, in the permanent open ocean zone (POOZ), the original Fbio value of (−17 ± 10) mmol m−2 d−1 gives a corrected value for N of (−2 ± 18) mmol m−2 d−1. We hypothesize that in the WSIZ enhanced water column stability due to the release of freshwater and nutrients from sea-ice melt may account for the higher N-value. These results stress the importance of accounting for physical biases when estimating mixed layer-marine productivity from in situ O2 / Ar ratios." @default.
- W4241006445 created "2022-05-12" @default.
- W4241006445 creator A5069738292 @default.
- W4241006445 creator A5077357390 @default.
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- W4241006445 date "2012-11-15" @default.
- W4241006445 modified "2023-09-29" @default.
- W4241006445 title "Biological production in the Bellingshausen Sea from oxygen-to-argon ratios and oxygen triple isotopes" @default.
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- W4241006445 doi "https://doi.org/10.5194/bgd-9-16033-2012" @default.
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