This dataset consists of 33 years (1985 to 2018), of global significant wave height and wind speed obtained from 13 altimeters, namely: GEOSAT, ERS-1, TOPEX, ERS-2, GFO, JASON-1, ENVISAT, JASON-2, CRYOSAT-2, HY-2A, SARAL, JASON-3 and SENTINEL-3A.
The altimeter data have been calibrated and validated against National Oceanographic Data Center (NODC) buoy data. Differences between altimeter and buoy data as a function of time are investigated for long-term stability. A cross validation between altimeters is also carried out in order to check the stability and consistency of the calibrations developed. Quantile-quantile comparisons between altimeter and buoy data as well as between altimeters are undertaking to test consistency of probability distributions and extreme value performance. The data were binned into 1o by 1o bins globally, to provide convenient access for users to download only the regions of interest. All data is quality controlled. This globally calibrated and cross-validated dataset provides a single point of storage for all altimeter missions in a consistent format.
The ongoing IMOS (Integrated Marine Observing System) Surface Waves Sub-Facility Altimeter Wave/Wind database is available through the Australian Ocean Data Network portal (https://portal.aodn.org.au/search?uuid=91ae1b2f-39e4-4d30-a853-5deb774614ca), the main repository for marine data in Australia. The data represented by this metadata record is a snapshot of the database at the time of this publication (February 2019), and has been assigned a DOI and will be maintained in perpetuity by the AODN.
Maintenance and Update Frequency: notPlanned
Statement: The data has been calibrated against NDBC buoy data and validated with independent buoy measurements and at cross-over points with other altimeter missions. The long term stability of the data has been assessed against buoy data and any discontinuities which may occur due to changes in the processing techniques or instrumentation has been removed in the calibration process. Calibration details can be found in Young et al., 2017, JTech.
Statement: This dataset replaces an earlier version (DOI: 10.26198/5c184f4a5cd2e (https://dx.doi.org/10.26198/5c184f4a5cd2e).
An error was discovered in the NetCDFs in relation to the wind speed values, and these have been corrected in this version of the dataset.
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.
Australian Research Council (ARC) Grants: DP130100215 and DP160100738