NZOTS-STM and –SAM STM = Subtropical (macronutrient-limited); SAM = Subantarctic (micronutrient-limited) Moorings deployed October 2000-May 2012, ~3000.

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Presentation transcript:

NZOTS-STM and –SAM STM = Subtropical (macronutrient-limited); SAM = Subantarctic (micronutrient-limited) Moorings deployed October 2000-May 2012, ~3000 m water depth Biophysical parameters: T, S, DO, currents (0-200 m); satellite surface chla (SSC) Particle fluxes (1500 m) – mass, POC, PON, PP, BSi, Ca→CaCO3, Al→lithogenic, forams, pteropods, dinofl. cysts, radiolarians NZ Contact: Scott.Nodder@niwa.co.nz References: Nodder et al. (2016) JGR-Oceans (accepted) Prebble et al. (2013) Marine Micropal. 104: 25–37.

Annual cycle of chla & MLD from satellite and CTD High spring fluxes at SAM derived from subsurface production not observed by satellites High interannual variability at both sites Lower fluxes at SAM cf. STM Annual cycles extracted from 2000-12 flux data-set High spring biomass & direct fluxes at STM Delayed translation of autumnal bloom to depth at STM High summer biomass at SAM not matched by high fluxes High spring fluxes at SAM Annual cycles for satellite chla, total mass flux and particulate organic carbon flux; Solid blue dots indicates high data confidence; green dashed line = ±1 stdev for surface chla; yellow dots = ±1 stdev for 1500 m fluxes SSC = satellite surface chla; C0 = 0-5 m Σchla from CTD chla-fluorescence; Ctot = 0-300 m Σchla; MLD = mixed-layer depth