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- W2326672348 abstract "We estimated mixed layer gross and net community production on a total of 20 crossings in the Australian sector of the Southern Ocean during the summer half-years (October–March) of 2007–2010. These estimates were calculated from measurements of O 2 /Ar ratios and triple isotope compositions of O 2 in ~250 seawater samples collected underway. For comparison purposes, we also measured the seasonal drawdown of mixed layer NO 3 - and SiO 2 concentrations during 2006–2007 and 2007–2008. Across all samples, average values of gross and net O 2 production (measured by O 2 /Ar and O 2 isotopes), were about 86±90 and 18±17 mmol O 2 m −2 day −1 , respectively. Gross production was highest at the Subtropical Front (up to ~230 mmol O 2 m −2 day −1 ), and decreased southward (to ~10 near the southern boundary of the Antarctic Circumpolar Current). In contrast, net community production showed little meridional variation. Net and gross O 2 production increased throughout the spring-to-fall period, although most SiO 2 drawdown occurred in December. Consistent with satellite chlorophyll estimates, we saw no evidence for an intense spring bloom (e.g. as has been observed in the North Atlantic). Volumetric net and gross O 2 production in the mixed layer, normalized to chlorophyll, increased (with considerable scatter) with average irradiance in the mixed layer. These relationships provide a basis for estimating production from Argo float data and properties observed by satellite. • We measured gross and net production on repeated crossings of the Southern Ocean, Australian sector. • Gross (but not net) production is highest in the north; there is no evidence for a strong spring bloom. • Chlorophyll-normalized net and gross production in the mixed layer rise with irradiance." @default.
- W2326672348 created "2016-06-24" @default.
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- W2326672348 date "2016-06-01" @default.
- W2326672348 modified "2023-09-24" @default.
- W2326672348 title "Ocean productivity south of Australia during spring and summer" @default.
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- W2326672348 doi "https://doi.org/10.1016/j.dsr.2016.02.018" @default.
- W2326672348 hasPublicationYear "2016" @default.
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