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

Neil John Holbrook, Ian David Goodwin, Shayne McGregor, Ernesto Molina, Scott Brendan Power

Research output: Contribution to journalArticleResearchpeer-review

51 Citations (Scopus)

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 >90 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 (33 51 18 S, 151 13 32 E). We further demonstrate, using a linear reduced-gravity ocean model, that ENSO to decadal timescale 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 multiannual 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. (c) 2010 Elsevier Ltd.
Original languageEnglish
Pages (from-to)547 - 558
Number of pages12
JournalDeep-Sea Research Part II: Topical Studies in Oceanography
Volume58
Issue number5
DOIs
Publication statusPublished - 2011
Externally publishedYes

Cite this

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title = "ENSO to multi-decadal time scale changes in East Australian Current transports and Fort Denison sea level: oceanic Rossby waves as the connecting mechanism",
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 >90 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 (33 51 18 S, 151 13 32 E). We further demonstrate, using a linear reduced-gravity ocean model, that ENSO to decadal timescale 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 multiannual 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. (c) 2010 Elsevier Ltd.",
author = "Holbrook, {Neil John} and Goodwin, {Ian David} and Shayne McGregor and Ernesto Molina and Power, {Scott Brendan}",
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doi = "10.1016/j.dsr2.2010.06.007",
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journal = "Deep-Sea Research Part II: Topical Studies in Oceanography",
issn = "0967-0645",
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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. / Holbrook, Neil John; Goodwin, Ian David; McGregor, Shayne; Molina, Ernesto; Power, Scott Brendan.

In: Deep-Sea Research Part II: Topical Studies in Oceanography, Vol. 58, No. 5, 2011, p. 547 - 558.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - ENSO to multi-decadal time scale changes in East Australian Current transports and Fort Denison sea level: oceanic Rossby waves as the connecting mechanism

AU - Holbrook, Neil John

AU - Goodwin, Ian David

AU - McGregor, Shayne

AU - Molina, Ernesto

AU - Power, Scott Brendan

PY - 2011

Y1 - 2011

N2 - 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 >90 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 (33 51 18 S, 151 13 32 E). We further demonstrate, using a linear reduced-gravity ocean model, that ENSO to decadal timescale 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 multiannual 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. (c) 2010 Elsevier Ltd.

AB - 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 >90 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 (33 51 18 S, 151 13 32 E). We further demonstrate, using a linear reduced-gravity ocean model, that ENSO to decadal timescale 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 multiannual 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. (c) 2010 Elsevier Ltd.

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U2 - 10.1016/j.dsr2.2010.06.007

DO - 10.1016/j.dsr2.2010.06.007

M3 - Article

VL - 58

SP - 547

EP - 558

JO - Deep-Sea Research Part II: Topical Studies in Oceanography

JF - Deep-Sea Research Part II: Topical Studies in Oceanography

SN - 0967-0645

IS - 5

ER -