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ENSO to multi-decadal time scale changes in East Australian Current transports and Fort Denison sea level: Oceanic Rossby waves as the connecting mechanism

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Holbrook, NJ and Goodwin, I and McGregor, S and Molina, E and Power, S (2011) ENSO to multi-decadal time scale changes in East Australian Current transports and Fort Denison sea level: Oceanic Rossby waves as the connecting mechanism. Deep-Sea Research II, 58 (5). pp. 547-558. ISSN 0967-0645

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Abstract

The connection between East Australian Current (EAC) transport variability and Australia’s east coast sea level has received little treatment in the literature. This is due in part to the complex interacting physical processes operating in the coastal zone combined with the sparsity of observations available to improve our understanding of these possible connections. This study demonstrates a statistically significant (at the 490% level) relationship between interannual to decadal time scale variations in observed estimates of the EAC transport changes and east coast sea level measured at the high-quality, long record Fort Denison tide-gauge in Sydney Harbour, Australia (3315101800S, 15111303200E). We further demonstrate, using a linear reduced-gravity ocean model, that ENSO to decadal time-scale variations and the ocean-adjusted multi-decadal trend (approx. 1 cm/decade) in observed sea level at Fort Denison are strongly connected to modulations of EAC transports by incoming westward propagating oceanic Rossby waves. We show that EAC transport and Fort Denison sea level vary in a manner expected from both Tasman Sea generated Rossby waves, which account for the interannual and multi-annual variability, and remotely forced (from east of New Zealand) Rossby wave connections through the mid-latitudes, accounting for the ocean-adjusted multi-decadal trend observed at the New South Wales coast – with the regional-Tasman Sea forcing explaining the greatest overall proportion of EAC transport and sea-level variances.

Item Type: Article
Journal or Publication Title: Deep-Sea Research II
Page Range: pp. 547-558
ISSN: 0967-0645
Identification Number - DOI: 10.1016/j.dsr2.2010.06.007
Additional Information: The definitive version is available at http://www.sciencedirect.com
Date Deposited: 01 Sep 2011 04:40
Last Modified: 18 Nov 2014 04:21
URI: http://eprints.utas.edu.au/id/eprint/11626
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