Observations on Chatham Rise currents

Heath, R. A.

doi:10.1080/00288330.1983.9516006

Cited by 20 publications

(8 citation statements)

References 6 publications

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“…The amplitudes of both the semidiurnal and diurnal tides are highest at the central mooring, and fall off to the north and the south. The semi-diurnal phase increases by about 30° going from the southern to the northern moorings, which is in agreement with the large phase change across the Chatham Rise as presented by Heath (1983), and reinforces the notion that the M 2 tide rotates anti-clockwise around New Zealand. In contrast, the diurnal phase is the same at the northern and central sites.…”

Section: Current Meterssupporting

confidence: 74%

“…Estimates of the amplitudes in the diurnal and semi-diurnal bands are presented in Table 1, along with Heath's (1983) estimates of the components from a depth of 193 m. Table 1 shows large spatial variations in the amplitudes and ellipticity of the two components. The amplitudes of both the semidiurnal and diurnal tides are highest at the central mooring, and fall off to the north and the south.…”

Section: Current Metersmentioning

confidence: 99%

“…New Zealand Journal of Marine and Freshwater Research, 1994, Vol Heath's (1983) mooring is also shown (M). Inset shows latitude as a function of time for Transects 2-15 made along 179°E.…”

Section: °Ementioning

confidence: 99%

“…The central and southern moorings were passed less frequently, but again the currents agree well. Heath (1983) deployed current meters for 34 days on the crest of the rise at 179°27'E (about 50 km east of our observations; Fig. 1).…”

Section: Comparison Of Adcp and Current Meter Measurementsmentioning

confidence: 99%

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Acoustic Doppler Current Profiler measurements over the Chatham Rise

Chiswell

1994

New Zealand Journal of Marine and Freshwater Research

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In September 1991, several north-south transects were made across the Chatham Rise along 179°E, using a ship equipped with a 150 kHz Acoustic Doppler Current Profiler (ADCP). Current meters were deployed near the crest of the rise. There is good agreement between the ADCP and current meter measurements. Zonal (along-rise) currents are dominated by diurnal tides, whereas meridian (cross-rise) currents are dominated by semi-diurnal tides. An estimate of the mean currents over 4 days of intensive observations over the northern flank of the Chatham Rise shows currents of up to 0.15 m s -1 , probably associated with meanders of the Subtropical Convergence.

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Section: Current Meterssupporting

confidence: 74%

Section: Current Metersmentioning

confidence: 99%

“…New Zealand Journal of Marine and Freshwater Research, 1994, Vol Heath's (1983) mooring is also shown (M). Inset shows latitude as a function of time for Transects 2-15 made along 179°E.…”

Section: °Ementioning

confidence: 99%

Section: Comparison Of Adcp and Current Meter Measurementsmentioning

confidence: 99%

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Acoustic Doppler Current Profiler measurements over the Chatham Rise

Chiswell

1994

New Zealand Journal of Marine and Freshwater Research

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“…Work on currents in the vicinity of the Chatham Rise by Heath ( 1983), Greig & Gilmour (1992), and Chiswell (1994) indicate that they are dominated by the M 2 tide with smaller diurnal tides also present. None of these studies report evidence of oscillations at the shorter periods under consideration here.…”

Section: Introductionmentioning

confidence: 99%

Short period (1–4 h) sea level fluctuations on the Canterbury coast, New Zealand

Goring

Henry

1998

New Zealand Journal of Marine and Freshwater Research

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Data from six sea level sites on the Canterbury coast, New Zealand, were analysed for short period (1-4 h) waves. Persistent waves with periods of 3.4 h in Pegasus Bay and 2.4 h in the Canterbury Bight were found. Their amplitude and phase are highly variable. Edge waves of similar period were found in simulations using a 2-dimensional, harmonic, shallow water, numerical model. Numerical and analytical modelling showed that the offshore decay in amplitude may be approximated by Stokes zero-mode edge waves, but the numerical model revealed that the detailed structure of the offshore decay is more complicated than can be explained by analytical models using a semi-infinite sloping beach. Rotation appears to have little effect. In Pegasus Bay the edge waves are trapped laterally between the northern extent of the bay and Banks Peninsula and offshore by the shelf. In the Canterbury Bight they are trapped laterally between Banks Peninsula and the curvature of the coast and offshore by the shelf. The origin of the waves and the reason for their variability are unclear, but may be the result of the non-linear interaction between semidiurnal tides and meteorological effects.

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Glacial to deglacial reservoir ages of surface waters in the southern South Pacific

Sarnthein¹,

Küssner²,

Lamy³

et al. 2020

Preprint

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This study is focused on the time coordinate of paleoclimate research. It employs an advanced tuning technique to age-classify glacial-to-deglacial ocean sediments with semi-millennial resolution and a new level in dating accuracy. The method is based on age-calibrated suites of atmospheric radiocarbon plateaus that are reflected by analogous radiocarbon plateaus obtained from planktic foraminifers sampled in sediment cores at centennial-scale resolution. The results provide a novel record of short-term changes in the radiocarbon age of dissolved carbon and ventilation, i.e. the 'reservoir age' of ocean surface waters. Such proxy records document variations in ocean circulation and mixing, now established at four sites along the western and eastern margins of the subpolar South Pacific. The age tie points are confirmed in a sediment core off Chile by independently dated marine ash layers. Our results provide precise stratigraphic correlations across the ocean and with paleoclimate records of Antarctic ice cores. In particular, the age records support the model of "bipolar seesaw" at the onset of rapid deglacial Antarctic warming coeval with the onset of the Heinrich cold spell in the North Atlantic, moreover, with the Antarctic Cold Reversal that preceded the onset of the Younger Dryas cold spell in the northern Hemisphere.

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Observations on Chatham Rise currents

Cited by 20 publications

References 6 publications

Acoustic Doppler Current Profiler measurements over the Chatham Rise

Acoustic Doppler Current Profiler measurements over the Chatham Rise

Short period (1–4 h) sea level fluctuations on the Canterbury coast, New Zealand

Glacial to deglacial reservoir ages of surface waters in the southern South Pacific

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