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Sea level and circulation variability of the Gulf of Carpentaria: Influence of the Madden‐Julian Oscillation and the adjacent deep ocean

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Oliver, ECJ and Thompson, KR Sea level and circulation variability of the Gulf of Carpentaria: Influence of the Madden‐Julian Oscillation and the adjacent deep ocean. Journal of Geophysical Research, 116 (C02019). pp. 1-14. ISSN 0148-0227

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Abstract

The Madden‐Julian Oscillation (MJO) is a significant contributing factor to
intraseasonal variability in both the tropical and extratropical atmosphere and ocean. Sea
level and circulation variations in the Gulf of Carpentaria (northern Australia) and the
coastal regions of the northeastern Indian Ocean and eastern Pacific have been shown to be
related to the MJO. A nonlinear barotropic numerical model, validated with local tide
gauge data, is used to study the Gulf of Carpentaria from 1979 to 2009. It is shown that
the model reproduces well the seasonal cycle of sea level as well as intraseasonal
variations and their seasonal modulations. Intraseasonal variability is shown to be driven
by surface wind stress that is closely related to the MJO. The model is next used to
remove the local wind effect from the tide gauge data, resulting in a low‐frequency
residual signal. This low‐frequency signal is interpreted in terms of larger‐scale modes
of variability of the adjacent shelf seas and the Indian and Pacific oceans through
comparison with climatological indices, correlations with regional sea level measured by
altimeters, and Hovmöller diagrams. It is shown that this signal is generated in the
Pacific and related to the El Niño–Southern Oscillation. The implications for predictability
and forecasting in the Gulf of Carpentaria on intraseasonal timescales are discussed.

Item Type: Article
Journal or Publication Title: Journal of Geophysical Research
Page Range: pp. 1-14
ISSN: 0148-0227
Identification Number - DOI: 10.1029/2010JC006596
Additional Information:

Copyright 2013 American Geophysical Union

Date Deposited: 22 Aug 2013 02:02
Last Modified: 18 Nov 2014 04:53
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