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IMOS - OceanCurrent - Gridded sea level anomaly - Delayed mode - DM02

Created 23/06/2025

Updated 23/06/2025

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Daily maps of gridded sea level anomaly (GSLA), gridded sea level (GSL) and surface geostrophic velocity (UCUR, VCUR) for the Australasian region. GSLA is mapped using optimal interpolation of detided, de-meaned, inverse-barometer-adjusted altimeter and coastal tide gauge estimates of sea level. Altimeter SSHA (sea surface height anomaly) was obtained from the RADS database and uses the most recent corrections (as of March 2020). Tide gauge data was obtained from 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. 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 30 days to 14 days. The altimeter data window for Near Real Time (NRT) maps is asymmetrical about the analysis date (-21 to 4 days). For both NRT and DM, altimeter data is weighted by the difference between the analysis date of the map and the time of each altimeter observation. DM02 - Delayed Mode GSLA version 02 DM02 GSLA is a complete update of the previous version, DM01 using the latest corrections and applies a long-wave correction to the non-reference mission altimeter SSHA to revise all daily maps from 1993-2020. Since April 2023, this DM02 product has been available via the AODN Portal, and supersedes the DM01 product formerly provided. The DM01 data is no longer updated, and is still available via https://catalogue-imos.aodn.org.au:443/geonetwork/srv/api/records/c68b6e1b-98a6-415e-8563-f526e1db1bd5. References: http://oceancurrent.imos.org.au/

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Additional Info

Field Value
Title IMOS - OceanCurrent - Gridded sea level anomaly - Delayed mode - DM02
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/5129d60b-55bc-4bca-976b-d8bd0e15fd7b
Contact Point
Australian Ocean Data Network
Gabriela.Semolinipilo@csiro.au
Reference Period 21/03/2024
Geospatial Coverage
Map data © OpenStreetMap contributors
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Data Portal Australian Oceans Data Network

Data Source

This dataset was originally found on Australian Oceans Data Network "IMOS - OceanCurrent - Gridded sea level anomaly - Delayed mode - DM02". Please visit the source to access the original metadata of the dataset:
https://catalogue.aodn.org.au/geonetwork/srv/eng/csw/dataset/imos-oceancurrent-gridded-sea-level-anomaly-delayed-mode-dm02