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The Great Australian Bight Research Program

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The Great Australian Bight Research Program 2013-2017 The Great Australian Bight Research Program Building a bigger picture of the Bight The Great Australian Bight Research Program Program findings 2013—2017 The Great Australian Bight Research Program is a collaboration between BP, CSIRO, the South Australian Research and Development Institute (SARDI), the University of Adelaide, and Flinders University. The Program aims to provide a whole-of-system understanding of the environment, economic and social values of the region; providing an information source for all to use. Our Partners The Great Australian Bight Research Program: Program Findings 2013-2017 Report is an Administrative Report that has not been reviewed outside the Program and is not considered peer-reviewed literature. Material presented may later be published in formal peer-reviewed scientific literature. ©2018 3 CONTENTS 6 INTRODUCTION 8 OCEAN PHYSICS 12 OPEN WATER RESEARCH 16 SEA-FLOOR BIODIVERSITY 22 ICONIC SPECIES AND APEX PREDATORS 28 PETROLEUM GEOLOGY AND GEOCHEMISTRY 32 SOCIO-ECONOMIC ANALYSIS 36 MODELLING AND INTEGRATION 40 PUBLICATIONS 51 MODELS DEVELOPED FOR THE GABRP 52 AWARDS 52 PARTNERS 53 OTHER PARTICIPANTS 5 Program INTRODUCTION findings 2013—2017 The Great Australian Bight extends from Cape Pasley, Western Australia to Cape Catastrophe, Kangaroo The Great Australian Bight Island, South Australia. Research Program has transformed the deep This unique marine environment is part of the world’s longest The four-year, $20 million social, environmental and economic southern-facing coastline, contains significant natural study brought together multi-disciplinary research teams resources, and is of global conservation significance. comprising more than 100 scientists and technical staff. It was ecosystems of the Great undertaken as a collaborative program involving BP, CSIRO, More than 85 per cent of known species in the region are the South Australian Research and Development Institute Australian Bight from one found nowhere else in the world. The Great Australian Bight (SARDI), the University of Adelaide, and Flinders University. provides critical habitats and migration pathways for iconic species and predators at the top of the food chain (apex New scientific knowledge developed in the GABRP includes: of Australia’s least studied predators), including Australian sea lions, white sharks, and pygmy blue whales. Australia’s largest and most valuable > Improved understanding of the ocean processes environments to one of the stocks of fishes in the open sea (pelagic fishes), especially underpinning the ecosystem. Australian sardine and southern bluefin tuna, occur in > New insights into what drives productivity in the open ocean. the Bight, and there are important coastal fisheries for most well known. crustaceans (e.g. southern rock lobster, prawns and crabs), > Greater awareness of the region’s biodiversity, especially molluscs (e.g. abalone) and finfish (e.g. snapper, King George in the deep ocean beyond the continental shelf. whiting, garfish and flathead), with the majority of South Australia’s valuable aquaculture farming residing in the coastal > Identification of at least 277 species that are new to science, waters off Eyre Peninsula. The Great Australian Bight is also and almost 887 species not previously reported in the Great considered to be one of the most prospective under-explored Australian Bight.* oil and gas provinces in the world. > Improved understanding of the biology and ecology Indigenous communities have strong cultural connections to of the region’s marine mammals, seabirds and sharks. the region, and many coastal towns rely on the pristine marine Improved understanding of the migratory and foraging environment that supports aquaculture, fisheries, recreational > patterns of southern bluefin tuna. fishing and tourism industries. NORTHERN TERRITORY Collation of historical information on seismic activity Prior to the Great Australian Bight Research Program > in the Great Australian Bight. (GABRP), relatively little was known about the region. Previous QUEENSLAND research focused mainly on coastal and shelf waters, while > Confirmation of oil and gas characteristics in the the deep-water ecosystems of the Great Australian Bight WESTERN AUSTRALIA Great Australian Bight. were poorly understood. The GABRP has transformed the ecosystems of the Bight from one of Australia’s least studied > Improved understanding of the values and priorities SOUTH AUSTRALIA deep sea environments to one of the most well-known. of people living in the Great Australian Bight’s coastal townships. The GABRP was established in April 2013 to develop scientific Ceduna PERTH NEW SOUTH WALES knowledge, tools and baselines to inform and support future The Program also developed valuable new scientific tools Cape Pasley Cape Leeuwin Port Lincoln use, development, management and conservation of the that provide a significant legacy for future scientific studies, Albany A.C.T. Cape ADELAIDE Catastrophe socio-ecological systems of the Great Australian Bight. The monitoring programs and management advice. CANBERRA VICTORIA Right: Program provided new knowledge on the structure and MELBOURNE The Great Australian Bight extends from Cape Pasley, function of the Bight’s ecosystems; on the nature and value WA to Cape Catastrophe, of its marine industries, including its potential hydrocarbon * Combined data from the Great Australian Bight Research Program – a collaboration South Australia. The 100 m, between BP, CSIRO, SARDI, the University of Adelaide and Flinders University and the 1000 m and 4000 m isobaths reserves; and on the dependence of associated coastal Great Australian Bight Deepwater Marine Program – a collaboration between Chevron and Australia’s Economic and CSIRO. Exclusive Zone across communities on the amenities provided by the environment. TAS HOBART southern Australia are shown. SW Cape GABRP: Program Findings 2013-2017 7 How the waters of the OCEAN PHYSICS Great Australian Bight work The broad-scale movements of the oceans off Australia’s south coast and its effects on marine ecology The Great Australian Bight and biodiversity have been understood for some time; has unique ocean features, however, knowledge gaps existed due to a lack of in-situ ocean data and high-resolution computer models. experiences some of the biggest waves in the world, Researchers in the GABRP’s Physical Oceanography Theme In winter, the Great Australian Bight’s circulation is driven by used three hydrodynamic models (two shelf-focused, ROMS eastward winds, the eastward shelf edge Leeuwin Current, and hosts the world’s and SHOC and one deep-sea focused, BRAN) to understand and deep upwelling 200-800 m below the surface in the west. seasonal, inter-annual and spatial circulation patterns in the Near the coast, eastward winds drive an eastward Coastal Bight and provide knowledge to underpin other studies in Current. Shelf downwelling is expected from eastward shelf longest west-east running the GABRP, and help future research. Models were validated currents and the formation of dense (cold, salty) water along using all available data, including observations made by BP the coast, where evaporation exceeds precipitation year-round. continental shelf. and the Integrated Marine Observing System (IMOS). Moored instruments, ocean gliders, surface buoys, satellites, radars The effect of waves on hydrodynamic processes was and even seals recorded ocean conditions at many locations investigated because of the significant year round swell in and depths over recent years. the Bight. Explicitly including the effect of waves did not improve the ability of the models to simulate the Bight’s Shelf-focused models simulated tidal signals and wind forced hydrodynamics, but waves were found to principally effect motions, as well as seasonal variability observed by moorings the long term drift at the surface. during 2011–14. The deep-sea focused global model (BRAN) provided tools to examine longer time scales, enabling inter- The improved understanding of circulation and nested annual variability due to the Leewin Current and far field suite of improved hydrodynamic models has advanced our El Niño events to be identified. understanding of physical processes in the Great Australian Bight. These new tools enabled the tracking of particles Shelf-focused model results matched well with observed to determine the likely sources of naturally occurring variability in shelf ocean currents for depths less than 300 m. hydrocarbon deposits collected from southern beaches Model results for winter and summer aligned with our previous as part of the GABRP, and in future will assist studies of understanding of circulation in the Bight, however model recruitment pathways for commercial fish stocks. results were obtained at a higher resolution and with more realistic forcing and initial fields of stratification. Strong evidence was found across the models for a deep (500 m) westward Flinders Current, previously not recorded. In the eastern Bight, the winds and ocean currents cause an upwelling of nutrient-rich water to the surface in summer. Westward winds from large high-pressure systems drive coastal upwelling and a westward Coastal Current in the central to eastern Great Australian Bight. A southward transport of water in the central Bight ‘collides’ with the equatorward deep ocean transport, producing downwelling year-round at the shelf edge, and a ridge in sea level that in part drives the South Australian Current to the east against the prevailing winds.
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