Planktic foraminifera-based sea-surface temperature record in the Tasman Sea and history of the Subtropical Front around New Zealand, over the last one million years

Hayward, Bruce W.; Sabaa, Ashwaq T; Kolodziej, Andrew Peter; Crundwell, Martin P.; Steph, Silke; Scott, G. H.; Neil, Helen L; Bostock, Helen C.; Carter, Lionel; Grenfell, Hugh R.

doi:10.1016/j.marmicro.2011.10.003

Cited by 47 publications

(103 citation statements)

References 57 publications

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“…(c) Late Pleistocene glacial stages, which are marked by large equatorward displacements of the STF and SAF, as well as increased bathymetric control over front positions to the east of New Zealand (constrained by multiple sites in Hayward et al . [] and Sikes et al . [], site numbers not shown here).…”

Section: Discussionmentioning

confidence: 99%

“…[], site numbers not shown here). The TF also migrated northward but some influence of subtropical water to the northern Tasman Sea is hypothesized (orange arrows [ Hayward et al ., ]). For the modern positions of the fronts please refer to Figure .…”

Section: Discussionmentioning

confidence: 99%

“…(b) Tasman Sea bathymetry and major circulation patterns, adapted from Hayward et al . []. SAF = Subantarctic Front.…”

Section: Introductionmentioning

confidence: 99%

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Pliocene‐Pleistocene evolution of sea surface and intermediate water temperatures from the southwest Pacific

et al. 2016

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Over the last 5 million years, the global climate system has evolved toward a colder mean state, marked by large‐amplitude oscillations in continental ice volume. Equatorward expansion of polar waters and strengthening temperature gradients have been detected. However, the response of the mid latitudes and high latitudes of the Southern Hemisphere is not well documented, despite the potential importance for climate feedbacks including sea ice distribution and low‐high latitude heat transport. Here we reconstruct the Pliocene‐Pleistocene history of both sea surface and Antarctic Intermediate Water (AAIW) temperatures on orbital time scales from Deep Sea Drilling Project Site 593 in the Tasman Sea, southwest Pacific. We confirm overall Pliocene‐Pleistocene cooling trends in both the surface ocean and AAIW, although the patterns are complex. The Pliocene is warmer than modern, but our data suggest an equatorward displacement of the subtropical front relative to present and a poleward displacement of the subantarctic front of the Antarctic Circumpolar Current (ACC). Two main intervals of cooling, from ~3 Ma and ~1.5 Ma, are coeval with cooling and ice sheet expansion noted elsewhere and suggest that equatorward expansion of polar water masses also characterized the southwest Pacific through the Pliocene‐Pleistocene. However, the observed trends in sea surface temperature and AAIW temperature are not identical despite an underlying link to the ACC, and intervals of unusual surface ocean warmth (~2 Ma) and large‐amplitude variability in AAIW temperatures (from ~1 Ma) highlight complex interactions between equatorward displacements of fronts associated with the ACC and/or varying poleward heat transport from the subtropics.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Pliocene‐Pleistocene evolution of sea surface and intermediate water temperatures from the southwest Pacific

et al. 2016

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“…The TF serves as the boundary between the warm tropical Coral Sea and cool subtropical Tasman Sea, forming a complex pattern of currents and eddies flowing mainly south and/or east influenced by the southward East Australian Current and regional seafloor topography, while the STF is a strong oceanic current separating warmer subtropical and cooler sub-Antarctic waters flowing south of Tasmania and south and east of New Zealand's South Island (Figure 1). Sea current strength and latitudinal position of both features have varied significantly since the formation of the Tasman Sea 65 Ma (Colgan, 2016;Martínez, 1994), and circulation has been influenced by glacial cycling, reaching a maximum during glacial maxima (Hayward et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…Palaeoceanographic reconstructions suggest that while the TF flowed close to the northern coast of New Zealand at 35°S during the previous interglacial (ca. 400 ka (MIS11) and 100 ka(MIS 5.5;Hayward et al, 2012). 10° of latitude(Kawagata, 2001), and was thus likely not a particularly effective vector of faunal exchange between these two regions during the last glacial period.…”

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Navigating the southern seas with small fins: Genetic connectivity of seahorses (Hippocampus abdominalis) across the Tasman Sea

Ashe

Wilson

2019

Journal of Biogeography

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Aim: Historical patterns of ocean circulation in the Southern Hemisphere have been well-studied, but the effects of coastal oceanography on marine biogeography in this region remain poorly understood relative to northern latitudes. Our study investigates historical and contemporary patterns of migration and dispersal across the Tasman Sea.Location: Coastal regions of the Tasman Sea including southeastern Australia, Tasmania and New Zealand.Taxon: Hippocampus abdominalis, the pot-bellied seahorse, one of the most broadly distributed seahorse species, and the only seahorse to have successfully colonized New Zealand from Australia across 2,000 km of open ocean. Methods:We used a multilocus genetic dataset to measure population diversity and differentiation from seahorses across the full species range to investigate contemporary and historical demography, and to reconstruct colonization routes across the Tasman Sea. Results:Genetic data indicate that seahorses colonized New Zealand from Australia during the previous interglacial-glacial cycle (12,000-120,000 ybp), and have evolved in relative isolation since the initial establishment event. Contemporary effective population sizes in the newly colonized range are substantially larger than those inferred in Australia, and both appear to be reduced relative to ancestral levels. Australian seahorses are genetically diverse and show high levels of population connectivity, while the distribution of genetic variation in New Zealand suggests an initial colonization of the South Island following by northward migration. Importantly, despite clear evidence that New Zealand seahorses are descendent from Australian ancestors, patterns of contemporary genetic diversity are consistent with trans-Tasman migration from New Zealand to Australia, suggesting that genetic variation accumulated in the newly colonized range may be contributing to the genetic diversity of Australian seahorses.Main conclusions: Despite a largely independent evolutionary trajectory of seahorses separated by the Tasman Sea, haplotype sharing between populations in Australia and New Zealand suggests that secondary genetic exchange is contributing to the contemporary phylogeography of the species. Patterns of genetic structure in H. abdominalis mirror those found in other rafting species, suggesting that adult dispersal via rafting has been an important vector of marine dispersal in this species. 197

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Changes in the position of the Subtropical Front south of New Zealand since the last glacial period

et al. 2015

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This study fills an important gap in our understanding of past changes in the Southern Subtropical Front (S-STF) in the southwest Pacific Ocean. Paleo-sea surface temperatures (SST) were estimated from planktic foraminiferal census counts from cores straddling the modern S-STF in the Solander Trough, south of New Zealand. The estimated SST were compared for 6 time slices; glacial period (25-21 ka), Last Glacial Maximum (LGM; 21-18 ka), early deglaciation (18-16 ka), late deglacial/early Holocene period (14-8 ka), mid-Holocene period (8-4 ka), and late Holocene period (4-0 ka). The position of the S-STF was determined by two methods:(1) the location of the 10°C isotherm and (2) the location of the highest SST gradients. These new results suggest that the S-STF was not continuous between east and west of New Zealand during the glacial period. Steep SST gradients indicate that a strong S-STF rapidly shifted south during the LGM and early deglaciation. During the late deglacial and Holocene periods the position of the S-STF differs between the two methods with reduced SST gradients, suggesting a more diffuse S-STF in the Solander Trough at this time. The glacial SST data suggest that the S-STF shifted north to the west of New Zealand, while to the east there was a stronger SST gradient across the front. This was possibly the result of an increased wind stress curl, which could have been caused by stronger, or more northerly Southern Hemisphere westerly winds (SHWW), or a merging of the SHWW split jet in this region.

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Planktic foraminifera-based sea-surface temperature record in the Tasman Sea and history of the Subtropical Front around New Zealand, over the last one million years

Cited by 47 publications

References 57 publications

Pliocene‐Pleistocene evolution of sea surface and intermediate water temperatures from the southwest Pacific

Pliocene‐Pleistocene evolution of sea surface and intermediate water temperatures from the southwest Pacific

Navigating the southern seas with small fins: Genetic connectivity of seahorses (Hippocampus abdominalis) across the Tasman Sea

Changes in the position of the Subtropical Front south of New Zealand since the last glacial period

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