Size‐fractionated phytoplankton standing stocks and primary production during austral winter and spring 1993 in the Subtropical Convergence region near New Zealand

Bradford‐Grieve, Janet M.; Chang, F. Hoe; Gall, Mark; Pickmere, S.; Richards, Fred

doi:10.1080/00288330.1997.9516759

Cited by 100 publications

(85 citation statements)

References 70 publications

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“…The physical, chemical, and biological characteristics of water masses and seasonal variations for the present study are consistent with other investigations in New Zealand waters (see references within Bradford- Grieve et al 1997) and show relatively homogeneous distribution of chlorophyll a within ST and SA waters, but a great variation in the STC. Satellite colour images from the Coastal Zone Colour Scanner have been used to estimate the potential primary production of the STC region and Southern Ocean (Sullivan et al 1993;Longhurst et al 1995).…”

Section: Variability Spatial and Seasonal Considerationssupporting

confidence: 80%

“…Methodology from voyages 3009 and 3014 were similar, except incubation containers were placed in shade cloth bags of known light transmission in an open deck incubator (Bradford-Grieve et al 1997).…”

Section: Photosynthesis Measurementsmentioning

confidence: 99%

“…Where appropriate other data is included from voyages to the STC region during 1993 (Bradford-Grieve et al 1997) and 1997. Altogether data from five research voyages between 1993 and 1997, across the STC near the Chatham Rise, east of the South Island are used (Table 1, Fig.…”

Section: Study Areamentioning

confidence: 99%

“…Sampling included deep chlorophyll maxima (DCM) when this feature was present. Full details of water collection, sampling methods, and analysis are presented elsewhere (Bradford-Grieve et al 1997;Hawes et al 1997). …”

Section: Water Collection and Samplingmentioning

confidence: 99%

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Predicting rates of primary production in the vicinity of the Subtropical Convergence east of New Zealand

Gall¹,

Hawes²,

Boyd³

1999

New Zealand Journal of Marine and Freshwater Research

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Water column integrated productivity of phytoplankton in three water masses east of New Zealand (Subtropical, Subtropical Convergence, and Subantarctic) varied both seasonally and spatially, ranging across two orders of magnitude. Productivity was highest in spring and autumn, and lowest in winter. Subtropical and Convergence waters were generally more productive than Subantarctic waters, but during summer the 2-3-fold range of production was similar in each of the three water masses. Multiple regression analysis identified that most of the variability in production was associated with differences in integrated chlorophyll a concentrations (56%). By considering both surface chlorophyll a and incident irradiance we derived a relationship which explained 74% of observed spatial and seasonal variability in integrated production. These surface variables can be sensed remotely, suggesting the potential for broad spatial mapping of the Received 14 July 1998; accepted 9 March 1999 seasonal cycles of production in these water masses in the New Zealand Exclusive Economic Zone (NZEEZ). Further analysis of the relationship identified that most of the remaining variability could be attributed to p b opt (a temperature-dependent photoadaptive term). Exceptions to the relationship and the application of productivity models within NZEEZ are discussed. M98042

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Section: Variability Spatial and Seasonal Considerationssupporting

confidence: 80%

Section: Photosynthesis Measurementsmentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

Section: Water Collection and Samplingmentioning

confidence: 99%

See 2 more Smart Citations

Predicting rates of primary production in the vicinity of the Subtropical Convergence east of New Zealand

Gall¹,

Hawes²,

Boyd³

1999

New Zealand Journal of Marine and Freshwater Research

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“…It is defined by surface temperature gradients of 4 ∘ C/200 km and strong along-rise currents [11][12][13]. Primary production in the frontal zone is high [14]. Flow from the north of warm, highly saline, nutrient-depleted Subtropical Surface Water (STW) extends south into the STF at ∼43 ∘ S. South of the STF is cold, less saline, nutrient-replete, Australasian Subantarctic Water (ASW) covering Bounty Trough and Campbell Plateau.…”

Section: Oceanographic Outlinementioning

confidence: 99%

Planktonic Foraminifera as Oceanographic Proxies: Comparison of Biogeographic Classifications Using Some Southwest Pacific Core-Top Faunas

Scott

2013

ISRN Oceanography

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The distribution of planktonic foraminifera, as free-floating protists, is largely controlled by hydrography. Their death assemblages in surficial sediments provide proxy data on upper water mass properties for paleoceanography. Techniques for mapping faunal distributions for this purpose are compared in a study of 35 core-top samples that span the Subtropical Front in the Southwest Pacific. Faunas are analyzed by taxon composition, order of dominant taxa, and abundance. Taxon composition (presence-absence data) and dominant taxa (ordinal data) recognize groups of sites that approximate major water mass distributions (cool subtropical water, subantarctic water) and clearly define the location of the Subtropical Front. Quantitative data (relative abundances) more closely reflect the success of taxa in upper water mass niches. This information resolves groups of sites that reflect differences in intrawater mass hydrography. Comparisons suggest that abundance data should provide much better oceanographic resolution globally than the widely used ordinal biogeographic classification that identifies only Tropical, Subtropical Transitional, Subpolar and Polar provinces. As the data are strongly structured by variance in the abundance of Globigerina bulloides, Globorotalia inflata, Neogloboquadrina incompta, and Neogloboquadrina pachyderma, comparable classifications result from most clustering strategies. Principal coordinates analysis best represents the configuration of sites in two dimensions.

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Annual cycles of deep‐ocean biogeochemical export fluxes in subtropical and subantarctic waters, southwest Pacific Ocean

2016

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The annual cycles of particle fluxes derived from moored sediment trap data collected during 2000–2012 in subtropical (STW) and subantarctic waters (SAW) east of New Zealand are presented. These observations are the most comprehensive export flux time series from temperate Southern Hemisphere latitudes to date. With high levels of variability, fluxes in SAW were markedly lower than in STW, reflecting the picophytoplankton‐dominated communities in the iron‐limited, high nutrient‐low chlorophyll SAW. Austral spring chlorophyll blooms in surface STW were near synchronous with elevated fluxes of bio‐siliceous, carbonate, and organic carbon‐rich materials to the deep ocean, probably facilitated by diatom and/or coccolithophorid sedimentation. Lithogenic fluxes were also high in STW, compared to SAW, reflecting proximity to the New Zealand landmass. In contrast, the highest biogenic fluxes in SAW occurred in spring when surface chlorophyll concentrations were low, while highest annual chlorophyll concentrations were in summer with no associated flux increase. We hypothesize that the high spring export in SAW results from subsurface chlorophyll accumulation that is not evident from remote‐sensing satellites. This material was also rich in biogenic silica, perhaps related to the preferential export of diatoms and other silica‐producing organisms, such as silicoflagellates and radiolarians. Organic carbon fluxes in STW are similar to that of other mesotrophic to oligotrophic waters (∼6–7 mg C m−2 d−1), whereas export from SAW is below the global average (∼3 mg C m−2 d−1). Regional differences in flux across the SW Pacific and Tasman region reflect variations in physical processes and ecosystem structure and function.

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Size‐fractionated phytoplankton standing stocks and primary production during austral winter and spring 1993 in the Subtropical Convergence region near New Zealand

Cited by 100 publications

References 70 publications

Predicting rates of primary production in the vicinity of the Subtropical Convergence east of New Zealand

Predicting rates of primary production in the vicinity of the Subtropical Convergence east of New Zealand

Planktonic Foraminifera as Oceanographic Proxies: Comparison of Biogeographic Classifications Using Some Southwest Pacific Core-Top Faunas

Annual cycles of deep‐ocean biogeochemical export fluxes in subtropical and subantarctic waters, southwest Pacific Ocean

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