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contributor authorZilberman, N. V.
contributor authorRoemmich, D. H.
contributor authorGille, S. T.
contributor authorGilson, J.
date accessioned2019-09-19T10:03:34Z
date available2019-09-19T10:03:34Z
date copyright4/23/2018 12:00:00 AM
date issued2018
identifier otherjtech-d-17-0153.1.pdf
identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4261072
description abstractAbstractWestern boundary currents (WBCs) are highly variable narrow meandering jets, making assessment of their volume transports a complex task. The required high-resolution temporal and spatial measurements are available only at a limited number of sites. In this study a method is developed for improving estimates of the East Australian Current (EAC) mean transport and its low-frequency variability, using complementary modern datasets. The present calculation is a case study that will be extended to other subtropical WBCs. The method developed in this work will reduce uncertainties in estimates of the WBC volume transport and in the interannual mass and heat budgets of the meridional overturning circulations, improving our understanding of the response of WBCs to local and remote forcing on long time scales. High-resolution expendable bathythermograph (HR-XBT) profiles collected along a transect crossing the EAC system near Brisbane, Australia, are merged with coexisting profiles and parking-depth trajectories from Argo floats, and with altimetric sea surface height data. Using HR-XBT/Argo/altimetry data combined with Argo trajectory-based velocities at 1000 m, the 2004?15 mean poleward alongshore transport of the EAC is 19.5 ± 2.0 Sv (1 Sv ≡ 106 m3 s?1) of which 2.5 ± 0.5 Sv recirculate equatorward just offshore of the EAC. These transport estimates are consistent in their mean and variability with concurrent and nearly collocated moored observations at 27°S, and with earlier moored observations along 30°S. Geostrophic transport anomalies in the EAC system, including the EAC recirculation, show a standard deviation of ±3.1 Sv at interannual time scales between 2004 and 2015.
publisherAmerican Meteorological Society
titleEstimating the Velocity and Transport of Western Boundary Current Systems: A Case Study of the East Australian Current near Brisbane
typeJournal Paper
journal volume35
journal issue6
journal titleJournal of Atmospheric and Oceanic Technology
identifier doi10.1175/JTECH-D-17-0153.1
journal fristpage1313
journal lastpage1329
treeJournal of Atmospheric and Oceanic Technology:;2018:;volume 035:;issue 006
contenttypeFulltext


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