Phytoplankton distributions around New Zealand derived from SeaWiFS remotely‐sensed ocean colour data

Murphy, Richard J.; Pinkerton, Matthew H.; Richardson, K.; Bradford‐Grieve, Janet M.; Boyd, Philip W.

doi:10.1080/00288330.2001.9517005

Cited by 214 publications

(211 citation statements)

References 43 publications

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“…Only at the southwest margin of the latter are they <10%. These data, which are consistent with those collected from traps between [47][48][49][50][51][52][53][54] ∘ S near Tasmania [56], contrast with its 62% abundance in Trap 1 at Pukaki Rise (Figure 1). This is higher than its average in HB (49%).…”

Section: Taxa As Hydrographicsupporting

confidence: 80%

“…The STF marks a sharp decline in its abundance (Figure 6(b)). It is strongly dominant in HB2 which is in the vicinity of the STF region [49] and features relatively high chlorophyll-a concentrations and winter deepening of the mixed layer. Although its abundance at site #3 in HB2 may be enhanced by dissolution [9, Figure 2]), the biotope possibly captures a strong trophic signal.…”

Section: Taxa As Hydrographicmentioning

confidence: 99%

“…At sites under STW, the taxon is most abundant nearest North Island (HB1), possibly responding to high nutrient levels near the shelf break, and at site #1. It is notably rare in HB2, near a region with high chlorophyll-a concentrations [49].…”

Section: Taxa As Hydrographicmentioning

confidence: 99%

“…Kincaid et al [44] found that its abundance is correlated with phytoplankton blooms. Vertically stratified plankton tows in the Southern Ocean between [41][42][43][44][45][46][47][48][49][50][51][52][53] ∘ S [45] show its abundance covaries closely with fluorescence maxima, a biomass proxy, in near-surface water. Schiebel et al [46] found that its abundance is closely related to entrainment of nutrient-rich water.…”

Section: Taxa As Hydrographicmentioning

confidence: 99%

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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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Section: Taxa As Hydrographicsupporting

confidence: 80%

Section: Taxa As Hydrographicmentioning

confidence: 99%

Section: Taxa As Hydrographicmentioning

confidence: 99%

Section: Taxa As Hydrographicmentioning

confidence: 99%

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

Scott

2013

ISRN Oceanography

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“…Hence, any contribution to increased paleoproductivity that upwelling might make is unlikely to have affected Site 593 to any great extent. In regions of high primary productivity in the vicinity of upwelling or oceanographic fronts, the flux of phytoplankton will be higher than in more oligotrophic areas (Yoder et al 1994;Murphy et al 2001), which would alter the ratio of nannofossils to foraminifera (Gasol et al 1997). Site 593 is not presently located near an oceanographic front, nor has it done so in the past (Nelson & Cooke 2001).…”

Section: Productivitymentioning

confidence: 99%

Textural variations in Neogene pelagic carbonate ooze at DSDP Site 593, southern Tasman Sea, and their paleoceanographic implications

Cooke¹,

Nelson

Crundwell

et al. 2004

New Zealand Journal of Geology and Geophysics

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Changes in Neogene sediment texture in pelagic carbonate-rich oozes on the Challenger Plateau, southern Tasman Sea, are used to infer changes in depositional paleocurrent velocities. The most obvious record of textural change is in the mud: sand ratio. Increases in the sand content are inferred to indicate a general up-core trend towards increasing winnowing of sediments resulting from increasing flow velocity of Southern Component Intermediate Water (SCIW), the forerunner of Antarctic Intermediate Water. In particular, the intervals c. 19-14.5 Ma, c. 9.5-8 Ma, and after 5 Ma are suggested to be times of increased SCIW velocity and strong sediment winnowing. Within the mud fraction, the fine silt to coarse clay sizes from 15.6 to 2 µm make the greatest contribution to the sediments and are composed of nannofossil plates. During extreme winnowing events it is the fine silt to very coarse clay material (13-3 µm) within this range that is preferentially removed, suggesting the 10 µm cohesive silt boundary reported for siliciclastic sediments does not apply to calcitic skeletal grains. The winnowed sediment comprises coccolithophore placoliths and spheres, represented by a mode at 4-7 µm.Further support for seafloor winnowing is gained from the presence in Hole 593 of a condensed sedimentary section from c. 18 to 14 Ma where the sand content increases to c. 20% of the bulk sample. Associated with the condensed section is a 6 m thick orange unit representing sediments subjected to particularly oxygen-rich, late early to early middle Miocene SCIW. Together these are inferred to indicate increased SCIW velocity resulting in winnowed sediment associated with faster arrival of oxygen-rich surface water subducted to form SCIW. Glacial development of Antarctica has been recorded from many deep-sea sites, with extreme glacials providing the mechanism to increase watermass flow. Miocene glacial zones Mi1b-Mi6 are identified in an associated oxygen isotope record from Hole 593, and correspond with times of particularly invigorated paleocirculation, bottom winnowing, and sediment textural changes.

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Intensification and variability of the confluence of subtropical and subantarctic boundary currents east of New Zealand

2014

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The confluence of subtropical and subantarctic boundary currents east of New Zealand creates strong fronts. The fronts have clear signatures in sea surface height (SSH) and sea surface temperature (SST) which make the confluence a good region to investigate the variability of the boundary currents of the South Pacific. Analysis of the 20 year time series of the SSH is used to investigate the location and strength of fronts, measured as the gradient in SSH (rSSH), and the eddy kinetic energy (EKE) and their relationship to local and large-scale wind forcing. The intensity of the rSSH and the EKE have increased at a rate of 0.02 cm km 21 and 32 cm 2 s 22 decade 21 , respectively. There is a significant correlation (r 5 0.7, p < 0.01) between the rSSH and EKE signals, reflecting baroclinic instabilities inherent in the fronts. Differences between northward and southward wind-driven transports across the confluence from the Island Rule are also increasing at 7.5 Sv decade 21 along with an upward trend in the SST differences across the region.Time series of the Southern Annular Mode (SAM) and Southern Oscillation Index (SOI) and local winds were compared to the frontal strength. Although the positive trend in the SOI coincides with increasing subtropical inflows, there is little correspondence of the indices and local winds with short-term variability. While these results indicate a connection between the intensification of the confluence and South Pacific winds, there is little change in frontal location north of Bollons Seamount which suggests bathymetry influences the location of the confluence.

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Phytoplankton distributions around New Zealand derived from SeaWiFS remotely‐sensed ocean colour data

Cited by 214 publications

References 43 publications

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

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

Textural variations in Neogene pelagic carbonate ooze at DSDP Site 593, southern Tasman Sea, and their paleoceanographic implications

Intensification and variability of the confluence of subtropical and subantarctic boundary currents east of New Zealand

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