Data

IMOS - OceanCurrent - Gridded sea level anomaly - Delayed mode - DM03

Australian Ocean Data Network
Integrated Marine Observing System (IMOS)
Viewed: [[ro.stat.viewed]] Cited: [[ro.stat.cited]] Accessed: [[ro.stat.accessed]]
ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=https://catalogue-imos.aodn.org.au/geonetwork/srv/api/records/663be14d-bb88-4e84-a34c-6c84a0196e2e&rft.title=IMOS - OceanCurrent - Gridded sea level anomaly - Delayed mode - DM03&rft.identifier=https://catalogue-imos.aodn.org.au/geonetwork/srv/api/records/663be14d-bb88-4e84-a34c-6c84a0196e2e&rft.description=Daily maps of gridded sea level anomaly (GSLA), gridded sea level (GSL) and geostrophic velocity (UCUR, VCUR) for the Australasian region. GSLA is mapped using optimal interpolation of de-tided, de-meaned, inverse-barometer-adjusted altimeter and coastal tide gauge estimates of sea level. The altimeter measurements were obtained from the RADS database (https://rads.tudelft.nl) and uses the most recent corrections (as of December 2025). Tide gauge data was obtained from the Australian National Collection of Homogenised Observations of Relative Sea Level (ANCHORS) dataset (Hague et al., 2022) and the Bureau of Meteorology’s Australian Baseline Sea Level Monitoring Project. GSL is obtained by adding an estimate of the Mean Dynamic Height using the mean of an 18yr run of OFAM3 (Ocean Forecasting Australia Model version 3). UCUR and VCUR, are the total geostrophic surface velocities estimated from the GSL. UCUR_MEAN and VCUR_MEAN are the geostrophic surface velocities due to the Mean Dynamic Height. MASK is to be applied to exclude regions where the gridding approach and input data are not appropriate, such as gulfs and shallow shelf sHi Neas.The altimeter data window for input to the Delayed Mode (DM) maps is symmetrical about the map date. The width of the window is dependent on the number of altimeters flying at the time and ranges from 20 days (1993-1997) to 10 days (1998-2025). The altimeter data is weighted by the difference between the analysis date of the map and the time of each altimeter observation.The tide gauge data window for input is of 3 days centred on the map date.Updates to DM03 relative to DM02:-    Revised GSLA maps from 1993 to 2025-    Uses the latest altimetric corrections-    Applies an along-track long-wavelength correction (LWC) to the altimeter data from non-reference missions (LWC files available on request)-    Uses ANCHORS tide gauge data from 1993-2023Since March 2026, this DM03 product has been available via the AODN Portal, and supersedes the DM02 product formerly provided. The DM02 data details are provided via https://catalogue-imos.aodn.org.au/geonetwork/srv/api/records/da30c0b8-4978-4a26-915e-b80c88bb4510.Maintenance and Update Frequency: asNeeded&rft.creator=Integrated Marine Observing System (IMOS) &rft.date=2026&rft.coverage=westlimit=57.00000000000001; southlimit=-59.99999999999999; eastlimit=185.00; northlimit=10.00&rft.coverage=westlimit=57.00000000000001; southlimit=-59.99999999999999; eastlimit=185.00; northlimit=10.00&rft_rights=Creative Commons Attribution 4.0 International License http://creativecommons.org/licenses/by/4.0/&rft_rights=The citation in a list of references is: IMOS [year-of-data-download], [Title], [data-access-URL], accessed [date-of-access].&rft_rights=Any users of IMOS data are required to clearly acknowledge the source of the material derived from IMOS in the format: Data was sourced from Australia’s Integrated Marine Observing System (IMOS) – IMOS is enabled by the National Collaborative Research Infrastructure strategy (NCRIS). If relevant, also credit other organisations involved in collection of this particular datastream (as listed in 'credit' in the metadata record).&rft_rights=Data, products and services from IMOS are provided as is without any warranty as to fitness for a particular purpose.&rft_subject=oceans&rft_subject=SEA SURFACE HEIGHT&rft_subject=EARTH SCIENCE&rft_subject=OCEANS&rft_subject=SEA SURFACE TOPOGRAPHY&rft_subject=EDDIES&rft_subject=OCEAN CIRCULATION&rft_subject=GYRES&rft_subject=OCEAN CURRENTS&rft_subject=Oceans | Ocean Circulation | Upwelling&rft_subject=Satellite Altimetry&rft_subject=Global / Oceans | Indian Ocean&rft_subject=Global / Oceans | Southern Ocean&rft_subject=Global / Oceans | Pacific Ocean&rft_subject=Marine Features (Australia) | Great Australian Bight, SA/WA&rft_subject=Marine Features (Australia) | Bass Strait, TAS/VIC&rft_subject=Regional Seas | Tasman Sea&rft_subject=Regional Seas | Coral Sea&rft_subject=Regional Seas | Solomon Sea&rft_subject=Regional Seas | Arafura Sea&rft_subject=Regional Seas | Timor Sea&rft_subject=Regional Seas | Banda Sea&rft_subject=Regional Seas | Java Sea&rft_subject=Regional Seas | Philippine Sea&rft_subject=Regional Seas | South China Sea&rft_subject=Regional Seas | Celebes Sea&rft_subject=Marine Features | Strait of Malacca&rft_subject=Regional Seas | Gulf of Thailand&rft_subject=Countries | India&rft_subject=Countries | Australia&rft_subject=States, Territories (Australia) | New South Wales&rft_subject=States, Territories (Australia) | Queensland&rft_subject=Countries | Timor-Leste&rft_subject=States, Territories (Australia) | Northern Territory&rft_subject=Countries | Vanuatu&rft_subject=States, Territories (Australia) | Tasmania&rft_subject=Countries | New Zealand&rft_subject=States, Territories (Australia) | Western Australia&rft_subject=States, Territories (Australia) | Victoria&rft_subject=States, Territories (Australia) | South Australia&rft_subject=Countries | Sri Lanka&rft_subject=Countries | Indonesia&rft_subject=Countries | Malaysia&rft_subject=Countries | Papua New Guinea&rft_subject=Countries | Fiji&rft_subject=Countries | Singapore&rft_subject=Countries | New Caledonia&rft_subject=Offshore Islands (Australia) | Macquarie Island&rft_subject=Countries | Philippines&rft_subject=orbiting satellite&rft_subject=Sea surface height above geoid&rft_subject=Eastward geostrophic current velocity in the water body&rft_subject=Northward geostrophic current velocity in the water body&rft_subject=Sea surface height anomaly&rft_subject=IMOS OceanCurrent&rft.type=dataset&rft.language=English Access the data
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Licence & Rights:

Open Licence view details
CC-BY

Creative Commons Attribution 4.0 International License
http://creativecommons.org/licenses/by/4.0/

The citation in a list of references is: "IMOS [year-of-data-download], [Title], [data-access-URL], accessed [date-of-access]."

Any users of IMOS data are required to clearly acknowledge the source of the material derived from IMOS in the format: "Data was sourced from Australia’s Integrated Marine Observing System (IMOS) – IMOS is enabled by the National Collaborative Research Infrastructure strategy (NCRIS)." If relevant, also credit other organisations involved in collection of this particular datastream (as listed in 'credit' in the metadata record).

Data, products and services from IMOS are provided "as is" without any warranty as to fitness for a particular purpose.

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Full description

Daily maps of gridded sea level anomaly (GSLA), gridded sea level (GSL) and geostrophic velocity (UCUR, VCUR) for the Australasian region. GSLA is mapped using optimal interpolation of de-tided, de-meaned, inverse-barometer-adjusted altimeter and coastal tide gauge estimates of sea level. The altimeter measurements were obtained from the RADS database (https://rads.tudelft.nl) and uses the most recent corrections (as of December 2025). Tide gauge data was obtained from the Australian National Collection of Homogenised Observations of Relative Sea Level (ANCHORS) dataset (Hague et al., 2022) and the Bureau of Meteorology’s Australian Baseline Sea Level Monitoring Project. GSL is obtained by adding an estimate of the Mean Dynamic Height using the mean of an 18yr run of OFAM3 (Ocean Forecasting Australia Model version 3). UCUR and VCUR, are the total geostrophic surface velocities estimated from the GSL. UCUR_MEAN and VCUR_MEAN are the geostrophic surface velocities due to the Mean Dynamic Height. MASK is to be applied to exclude regions where the gridding approach and input data are not appropriate, such as gulfs and shallow shelf sHi Neas.

The altimeter data window for input to the Delayed Mode (DM) maps is symmetrical about the map date. The width of the window is dependent on the number of altimeters flying at the time and ranges from 20 days (1993-1997) to 10 days (1998-2025). The altimeter data is weighted by the difference between the analysis date of the map and the time of each altimeter observation.
The tide gauge data window for input is of 3 days centred on the map date.

Updates to DM03 relative to DM02:
-    Revised GSLA maps from 1993 to 2025
-    Uses the latest altimetric corrections
-    Applies an along-track long-wavelength correction (LWC) to the altimeter data from non-reference missions (LWC files available on request)
-    Uses ANCHORS tide gauge data from 1993-2023

Since March 2026, this DM03 product has been available via the AODN Portal, and supersedes the DM02 product formerly provided. The DM02 data details are provided via https://catalogue-imos.aodn.org.au/geonetwork/srv/api/records/da30c0b8-4978-4a26-915e-b80c88bb4510.

Lineage

Maintenance and Update Frequency: asNeeded

Notes

Credit
Australia’s Integrated Marine Observing System (IMOS) is enabled by the National Collaborative Research Infrastructure Strategy (NCRIS). It is operated by a consortium of institutions as an unincorporated joint venture, with the University of Tasmania as Lead Agent.
Credit
CSIRO Oceans & Atmosphere - Hobart

Created: 23 02 2026

This dataset is part of a larger collection

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Spatial Coverage And Location

text: westlimit=57.00000000000001; southlimit=-59.99999999999999; eastlimit=185.00; northlimit=10.00

Subjects
Countries | Australia | Countries | Fiji | Countries | India | Countries | Indonesia | Countries | Malaysia | Countries | New Caledonia | Countries | New Zealand | Countries | Papua New Guinea | Countries | Philippines | Countries | Singapore | Countries | Sri Lanka | Countries | Timor-Leste | Countries | Vanuatu | EARTH SCIENCE | Eddies | Eastward geostrophic current velocity in the water body | Gyres | Global / Oceans | Indian Ocean | Global / Oceans | Pacific Ocean | Global / Oceans | Southern Ocean | IMOS OceanCurrent | Marine Features (Australia) | Bass Strait, TAS/VIC | Marine Features (Australia) | Great Australian Bight, SA/WA | Marine Features | Strait of Malacca | Northward geostrophic current velocity in the water body | OCEAN CIRCULATION | Ocean Currents | OCEANS | Oceans | Ocean Circulation | Upwelling | Offshore Islands (Australia) | Macquarie Island | Regional Seas | Arafura Sea | Regional Seas | Banda Sea | Regional Seas | Celebes Sea | Regional Seas | Coral Sea | Regional Seas | Gulf of Thailand | Regional Seas | Java Sea | Regional Seas | Philippine Sea | Regional Seas | Solomon Sea | Regional Seas | South China Sea | Regional Seas | Tasman Sea | Regional Seas | Timor Sea | Sea Surface Height | SEA SURFACE TOPOGRAPHY | Satellite Altimetry | Sea surface height above geoid | Sea surface height anomaly | States, Territories (Australia) | New South Wales | States, Territories (Australia) | Northern Territory | States, Territories (Australia) | Queensland | States, Territories (Australia) | South Australia | States, Territories (Australia) | Tasmania | States, Territories (Australia) | Victoria | States, Territories (Australia) | Western Australia | oceans | orbiting satellite |

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Other Information
(NetCDF files via THREDDS catalog - Delayed Mode data)

url : https://thredds.aodn.org.au/thredds/catalog/IMOS/OceanCurrent/GSLA/DM/catalog.html

(NetCDF files via THREDDS catalog - yearly aggregated Delayed Mode data)

url : https://thredds.aodn.org.au/thredds/catalog/IMOS/OceanCurrent/GSLA/DM/yearfiles/catalog.html

(OceanCurrent web site)

url : http://oceancurrent.imos.org.au/

(View and download data though the AODN Portal)

url : https://portal.aodn.org.au/search?uuid=663be14d-bb88-4e84-a34c-6c84a0196e2e

Identifiers
  • global : 663be14d-bb88-4e84-a34c-6c84a0196e2e