Variability, coherence and forcing mechanisms in the New Zealand ocean boundary currents

Fernandez, Denise; Bowen, Melissa; Sutton, Philip

doi:10.1016/j.pocean.2018.06.002

Cited by 28 publications

(52 citation statements)

References 82 publications

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“…This trend is consistent with changes in the wind stress curl that are believed to have caused the EAC to extend farther south over the past decade (Cai et al, 2005;Roemmich et al, 2007;Hill et al, 2011). Interestingly, in contrast to the EAC, there has been no significant trend in the EAuC transport over the past 30 years, and there is little correlation in variability with the large-scale or local wind forcing (Fernandez et al, 2018).…”

Section: Tropical Atlantic Current Systemsupporting

confidence: 73%

More Than 50 Years of Successful Continuous Temperature Section Measurements by the Global Expendable Bathythermograph Network, Its Integrability, Societal Benefits, and Future

et al. 2019

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in ocean heat content (OHC), sea level change, and meridional ocean heat transport. Here, we present key scientific advances in understanding the changing ocean and climate system supported by XBT observations. Improvement in XBT data quality and its impact on computations, particularly of OHC, are presented. Technology development for probes, launchers, and transmission techniques are also discussed. Finally, we offer new perspectives for the future of the Global XBT Network.

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Section: Tropical Atlantic Current Systemsupporting

confidence: 73%

More Than 50 Years of Successful Continuous Temperature Section Measurements by the Global Expendable Bathythermograph Network, Its Integrability, Societal Benefits, and Future

et al. 2019

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“…Chiswell et al 2015). Furthermore, in their study of variability in New Zealand boundary currents, Fernandez et al (2018) found no discernable trend in East Cape Current transport. Therefore, the underlying reason for this localised signal remains a matter for further research.…”

Section: Discussionmentioning

confidence: 92%

Ocean temperature change around New Zealand over the last 36 years

Sutton

Bowen

2019

New Zealand Journal of Marine and Freshwater Research

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Ocean temperature changes around New Zealand are estimated from satellite sea surface temperature (SST) products since 1981, two high resolution expendable bathythermograph transects (HRXBT) since 1986 and 1991, and Argo data since 2006. The datasets agree well where they overlap. Significant surface warming is found in subtropical waters. Greatest warming is east of Australia and in the central Pacific. All NZ coastal waters are warming, with strongest warming east of Wairarapa and weakest between East Cape and North Cape. Temperature changes are surface intensified, extending to ∼200 m in the northeast and at least 850 m in the eastern Tasman. Significant interannual variability is coherent over a large area of ocean north of the Subtropical Front and modulates extreme events. NZ air temperatures are highly correlated at interannual timescales with SSTs over a broad region of ocean north of the Subtropical Front from the eastern Tasman to east of the dateline.

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“…Finally, absolute transports, measured in Sverdrups (

1 S v = 10^{6} m^{3} s^{- 1}

) and based on the altimetry and information of velocity changes with depth, are derived from the surface geostrophic velocities and the shear over the width of the EAUC. For details in the calculations see Fernandez [].…”

Section: Methodsmentioning

confidence: 99%

Variability of the subtropical mode water in the Southwest Pacific

2017

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The variability of Subtropical Mode Water (STMW) in the Southwest Pacific is investigated using a 28 year‐long time series (1986–2014) of high‐resolution expendable bathythermograph data north of New Zealand (PX06) and a shorter time series, the Roemmich‐Gilson monthly Argo optimal interpolation for the 2004–2014 period. The variability in STMW inventories is compared to the variability in air‐sea heat fluxes, mixed layer depths and transport of the East Auckland Current (EAUC) to assess both the atmospheric and oceanic roles influencing the formation and decay of STMW. The STMW north of New Zealand has a short lifespan with little persistence of the water mass from 1 year to the next one. Deeper mixed layers and negative anomalies in surface heat fluxes are correlated with increased formation of STMW. The heat content of the STMW layer is anticorrelated with inventories, particularly during the El Niño years. This suggests that large volumes of STMW are coincident with cooler conditions in the prior winter and less oceanic heat storage. There is significant seasonal and interannual variability in STMW inventories, however there are no trends in STMW properties, including its core layer temperature over the last decade. The variability of the winter EAUC transport is highly correlated with the STMW inventories and thermocline depth in the following spring, suggesting ocean dynamics deepen the thermocline and precondition for deeper mixed layers.

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Variability, coherence and forcing mechanisms in the New Zealand ocean boundary currents

Cited by 28 publications

References 82 publications

More Than 50 Years of Successful Continuous Temperature Section Measurements by the Global Expendable Bathythermograph Network, Its Integrability, Societal Benefits, and Future

More Than 50 Years of Successful Continuous Temperature Section Measurements by the Global Expendable Bathythermograph Network, Its Integrability, Societal Benefits, and Future

Ocean temperature change around New Zealand over the last 36 years

Variability of the subtropical mode water in the Southwest Pacific

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