The Southland Front, New Zealand: Variability and ENSO correlations
The Southland Front, New Zealand: Variability and ENSO correlations
A detailed analysis of the Southland Front, a shelf-break system off the southeast coast of South Island, New Zealand is presented. The position, temperature, temperature range and width of the front are determined using a new statistical front detection algorithm and 21 years worth of Advanced Very High Resolution Radiometer satellite sea surface temperature (SST) data. Overall, the front is strongest (highest SST gradients) in the summer and winter, and the across front gradient decreases northward in all seasons, consistent with an equatorward decrease in stability and divergence of isobaths. The surface expression of the front moves further offshore during the winter months and is found closest inshore in the summer. Seasonality of the front is strongly controlled by the annual cycle of subtropical and subantarctic water mass temperatures. Both the temperature and strength of the front are interannually variable, and correlated with the El Niño-Southern Oscillation (ENSO); they both decrease during El Niño, and increase during La Niña events. ENSO indices lead changes in the fronts temperature by up to 6 months. Conversely, the gradient may change up to 6 months in advance of peak ENSO indices. The strength and sign of correlations is seasonally dependent.
1535-1548
Hopkins, J.
194a478e-209d-42f3-989d-d380a69c6a37
Shaw, A.G.P.
4afa8737-18d4-4c88-98a4-55572fb51562
Challenor, P.
a7e71e56-8391-442c-b140-6e4b90c33547
15 August 2010
Hopkins, J.
194a478e-209d-42f3-989d-d380a69c6a37
Shaw, A.G.P.
4afa8737-18d4-4c88-98a4-55572fb51562
Challenor, P.
a7e71e56-8391-442c-b140-6e4b90c33547
Hopkins, J., Shaw, A.G.P. and Challenor, P.
(2010)
The Southland Front, New Zealand: Variability and ENSO correlations.
Continental Shelf Research, 30 (14), .
(doi:10.1016/j.csr.2010.05.016).
Abstract
A detailed analysis of the Southland Front, a shelf-break system off the southeast coast of South Island, New Zealand is presented. The position, temperature, temperature range and width of the front are determined using a new statistical front detection algorithm and 21 years worth of Advanced Very High Resolution Radiometer satellite sea surface temperature (SST) data. Overall, the front is strongest (highest SST gradients) in the summer and winter, and the across front gradient decreases northward in all seasons, consistent with an equatorward decrease in stability and divergence of isobaths. The surface expression of the front moves further offshore during the winter months and is found closest inshore in the summer. Seasonality of the front is strongly controlled by the annual cycle of subtropical and subantarctic water mass temperatures. Both the temperature and strength of the front are interannually variable, and correlated with the El Niño-Southern Oscillation (ENSO); they both decrease during El Niño, and increase during La Niña events. ENSO indices lead changes in the fronts temperature by up to 6 months. Conversely, the gradient may change up to 6 months in advance of peak ENSO indices. The strength and sign of correlations is seasonally dependent.
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revised_hopkins09.pdf
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Published date: 15 August 2010
Organisations:
Marine Systems Modelling, Marine Physics and Ocean Climate
Identifiers
Local EPrints ID: 159079
URI: http://eprints.soton.ac.uk/id/eprint/159079
ISSN: 0278-4343
PURE UUID: 588b2783-ba6b-40c9-8c3a-11da6724a3e4
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Date deposited: 25 Jun 2010 12:09
Last modified: 14 Mar 2024 01:53
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Author:
J. Hopkins
Author:
A.G.P. Shaw
Author:
P. Challenor
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