Data

WAMSI Node 1.1.2 - Coupled hydrodynamic and biogeochemical models

Australian Ocean Data Network
CSIRO O&A, Information & Data Centre (Point of contact) CSIRO Oceans & Atmosphere - Hobart (Associated with)
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ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=https://marlin.csiro.au/geonetwork/srv/eng/catalog.search#/metadata/8002c12d-f599-4dde-878b-8d7fc39fd992&rft.title=WAMSI Node 1.1.2 - Coupled hydrodynamic and biogeochemical models&rft.identifier=Anzlic Identifier: ANZCW0306008584&rft.publisher=Australian Ocean Data Network&rft.description=The dynamics of the seasonal evolution of chlorophyll a at the continental shelf break around 32 degrees south has been investigated using a one-dimensional numerical BGC model at shelf and lagoon scales. The results show that a combination of vertical mixing associated with the Leeuwin Current and surface cooling during the winter months is responsible for the wintertime increase in chlorophyll a concentration at the shelf break (Greenwood and Soetaert, 2008). In addition, variation in the timing and magnitude of the winter increase in chlorophyll is shown, for the first time, to relate to the strength of the Leeuwin Current. A nitrogen budget for the southwest WA shelf has been derived by diagnosing the simulated fluxes of particulate and dissolved nitrogen from the 3-D model across the shelf boundaries (across two cross-shelf transects at 27S and 34.5S and across the 100 m isobath) as well as deposition and release of nitrogen at the seafloor.Progress Code: completedMaintenance and Update Frequency: notPlannedStatement: A coupled three-dimensional hydrodynamic-biogeochemical model (ROMS) has been configured for the southwest shelf off Western Australia. The primary task of the model is to simulate seasonal changes in phytoplankton chlorophyll concentrations and help quantify seasonal fluxes of nitrogen on and off the shelf. The model domain extends from the coast to offshore 108oE and from 35oS (Cape Leeuwin) to 21oS (the North West Cape). The horizontal resolution in cross-shore direction varies between 2 km and 4 km from the coast to the 1000 m isobath and then increases to 8 km at the oceanic boundary. The alongshore resolution varies from 3 km to 8 km. There are 30 vertical levels with refinement in the top 200 m. Full details of the hydrodynamic model are given in chapter 1. The biogeochemical model describes pelagic and benthic aspects of nitrogen cycling.The pelagic model is NPZD in nature, and includes seven state variables: phytoplankton (PHY), zooplankton (ZOO), nitrate (NO3), ammonium (NH4), small and large detritus (SDET and LDET), and phytoplankton chlorophyll (CHL).&rft.creator=Anonymous&rft.date=2009&rft.coverage=westlimit=20; southlimit=-70; eastlimit=127; northlimit=28&rft.coverage=westlimit=20; southlimit=-70; eastlimit=127; northlimit=28&rft_rights=&rft_rights=Data is made available under a Creative Commons Attribution 4.0 International Licence (<a href=http://creativecommons.org/licenses/by/4.0/>http://creativecommons.org/licenses/by/4.0/</a>). Data is supplied 'as is' without any warranty or guarantee except as required by law to be given to you. The data may not be free of error, comprehensive, current or appropriate for your particular purpose. You accept all risk and responsibility for its use. ATTRIBUTION STATEMENT: The dataset [Insert-dataset-name-here] downloaded on [Insert-DD-Mmm-YYYY-here] was provided by CSIRO.&rft_subject=oceans&rft_subject=Coastal Waters (Australia) | West Australia Coast West, WA&rft_subject=Global / Oceans | East Indian Ocean&rft_subject=Global / Oceans | Indian Ocean&rft_subject=WAMSI Node 1 Project 1: Southwest Australian Coastal Biogeochemistry&rft_subject=Western Australian Marine Science Institute&rft.type=dataset&rft.language=English Access the data
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Data is made available under a Creative Commons Attribution 4.0 International Licence (http://creativecommons.org/licenses/by/4.0/). Data is supplied 'as is' without any warranty or guarantee except as required by law to be given to you. The data may not be free of error, comprehensive, current or appropriate for your particular purpose. You accept all risk and responsibility for its use. ATTRIBUTION STATEMENT: The dataset [Insert-dataset-name-here] downloaded on [Insert-DD-Mmm-YYYY-here] was provided by CSIRO.

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The dynamics of the seasonal evolution of chlorophyll a at the continental shelf break around 32 degrees south has been investigated using a one-dimensional numerical BGC model at shelf and lagoon scales. The results show that a combination of vertical mixing associated with the Leeuwin Current and surface cooling during the winter months is responsible for the wintertime increase in chlorophyll a concentration at the shelf break (Greenwood and Soetaert, 2008). In addition, variation in the timing and magnitude of the winter increase in chlorophyll is shown, for the first time, to relate to the strength of the Leeuwin Current. A nitrogen budget for the southwest WA shelf has been derived by diagnosing the simulated fluxes of particulate and dissolved nitrogen from the 3-D model across the shelf boundaries (across two cross-shelf transects at 27S and 34.5S and across the 100 m isobath) as well as deposition and release of nitrogen at the seafloor.

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Progress Code: completed
Maintenance and Update Frequency: notPlanned
Statement: A coupled three-dimensional hydrodynamic-biogeochemical model (ROMS) has been configured for the southwest shelf off Western Australia. The primary task of the model is to simulate seasonal changes in phytoplankton chlorophyll concentrations and help quantify seasonal fluxes of nitrogen on and off the shelf. The model domain extends from the coast to offshore 108oE and from 35oS (Cape Leeuwin) to 21oS (the North West Cape). The horizontal resolution in cross-shore direction varies between 2 km and 4 km from the coast to the 1000 m isobath and then increases to 8 km at the oceanic boundary. The alongshore resolution varies from 3 km to 8 km. There are 30 vertical levels with refinement in the top 200 m. Full details of the hydrodynamic model are given in chapter 1. The biogeochemical model describes pelagic and benthic aspects of nitrogen cycling.The pelagic model is NPZD in nature, and includes seven state variables: phytoplankton (PHY), zooplankton (ZOO), nitrate (NO3), ammonium (NH4), small and large detritus (SDET and LDET), and phytoplankton chlorophyll (CHL).

Notes

Credit
Jim Greenwood
Credit
Liejun Zhong
Credit
Peter Craig
Credit
Ming Feng and Karen Wild-Allen

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127,28 127,-70 20,-70 20,28 127,28

73.5,-21

text: westlimit=20; southlimit=-70; eastlimit=127; northlimit=28

Subjects
Coastal Waters (Australia) | West Australia Coast West, WA | Global / Oceans | East Indian Ocean | Global / Oceans | Indian Ocean | WAMSI Node 1 Project 1: Southwest Australian Coastal Biogeochemistry | Western Australian Marine Science Institute | oceans |

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  • Local : Anzlic Identifier: ANZCW0306008584
  • Local : Marlin Record Number: 8584
  • global : 8002c12d-f599-4dde-878b-8d7fc39fd992