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Evolution and dynamics of tropical river plumes in the Great Barrier Reef: An integrated remote sensing and in situ study

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dc.contributor Australian Institute Of Marine Science
dc.contributor Sch Math & Phys Sci
dc.contributor James Cook Univ N Queensland
dc.contributor University Of Southern Mississippi
dc.contributor Flinders University South Australia
dc.contributor Univ So Mississippi
dc.contributor James Cook University
dc.contributor Airborne Res Australia
dc.contributor Dept Marine Sci
dc.contributor Australian Inst Marine Sci
dc.contributor Flinders Univ S Australia
dc.contributor Australian Institute Of Marine Science (aims) en PRYTZ, A BURRAGE, DM HERON, ML HACKER, JM STIEGLITZ, TC STEINBERG, CR 2017-03-21T01:16:53Z 2017-03-21T01:16:53Z 2013-02-28T06:48:19Z 2019-05-09T01:09:33Z 2013-02-28T06:48:19Z 2017-03-21T01:16:53Z 2017-03-21T01:16:53Z 2019-05-09T01:09:33Z 2002-09-01
dc.identifier 6462 en
dc.identifier.citation Burrage DM, Heron ML, Hacker JM, Stieglitz TC, Steinberg CR and Prytz A (2002) Evolution and dynamics of tropical river plumes in the Great Barrier Reef: An integrated remote sensing and in situ study. Journal of Geophysical Research. 107: 12-10. en
dc.identifier.issn 2169-9275
dc.description.abstract [1] The short-lived but intense discharge of freshwater from tropical rivers into the Great Barrier Reef (GBR) Lagoon and the associated salinity reductions are a critical consideration in marine research and management of the ecologically sensitive GBR World Heritage Area. Salinity provides a unique tracer that gives clues to the origin of river-borne contaminants and allows the influences of storm-induced resuspension and river discharge on turbidity to be clearly distinguished. We describe a field investigation of the evolution and dynamics of the Herbert River plume in the central GBR. Its primary goals were to use an airborne salinity mapper and in situ instruments to study the three-dimensional structure and evolution of the plume and to lay a foundation for numerical modeling studies of its dynamics. The aircraft surveys provided a rapid assessment of the plumes spatial extent, while the in situ data revealed details of its subsurface structure. The Herbert River plume was produced by heavy rainfall associated with tropical storms during the La Nina-dominated 1999/2000 monsoon season. In the near field, the surface expression of the plume boundaries was indicated by sharp color and salinity fronts that were clearly visible from the air and sea surface. In the far field and middle Lagoon, the plume was more dispersed and ultimately merged with the larger-scale salinity gradients and with the remnant plume of the more distant, and larger, Burdekin River. The plume location and structure evolved in response to changing river flows, tidal and subtidal circulation, and wind. Using Garvine's Kelvin number-based scheme, the plume was classified as intermediate in dynamical character and thus is subject to a variety of forcings. The plume evolved in response to changes in the relative intensity of tidal currents and low-frequency circulation due to wind and western boundary current forcing. It also displayed a characteristic "hook-shaped'' structure, which has been identified previously in numerical plume model studies. This structure appeared in the presence of accelerating along-shelf current flow and horizontal shear and it indicates that the plume circulation had a strongly three-dimensional character. The approach demonstrates the efficacy of combining airborne and in situ methods to observe rapidly evolving coastal salinity structure and dynamics and sets the stage for future satellite-borne studies of larger-scale features showing contrasting salinity distributions.
dc.language English
dc.language en en
dc.relation.ispartof Journal of Geophysical Research - pages: 107: 12-10 en
dc.relation.ispartof Null
dc.subject Alaska
dc.subject Dynamics
dc.subject Baroclinic Transport
dc.subject Surface
dc.subject Fate
dc.subject Front
dc.subject Plume
dc.subject Gulf
dc.subject Geosciences, Multidisciplinary
dc.subject Continental-shelf
dc.subject Oceanography
dc.subject Event
dc.subject Convergence
dc.subject Coastal Current
dc.subject Salinity
dc.subject Waters
dc.title Evolution and dynamics of tropical river plumes in the Great Barrier Reef: An integrated remote sensing and in situ study
dc.type journal article en
dc.identifier.doi 10.1029/2001JC001024
dc.identifier.wos WOS:000180574100016

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