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.
UR - http://www.sciencedirect.com/science/article/pii/S0967064510002146/pdfft?md5=c3493649246576f964673f0b07c898f0&pid=1-s2.0-S0967064510002146-main.pdf
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 -