Altimeter Calibration and Tectonics Inference Oceanographic Network (ACTION): From OSTM to SWOT
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Citation of Original PublicationPavlis, E. C.; Evans, K.; Milas, P.; Paradissis, D.; Massinas, B.; Frantzis, X.; Altimeter Calibration and Tectonics Inference Oceanographic Network (ACTION): From OSTM to SWOT; Ocean Surface Topography Mission Science Team Meeting (2012); https://www.aviso.altimetry.fr/fileadmin/documents/OSTST/2012/posters/Pavlis_altimeter_calibration.pdf;
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We will report on recent results and on the extension of the eastern Mediterranean Altimeter Calibration network—eMACnet, to an Aegean-wide network of coastal tide gauges equipped with GNSS receivers and offshore buoys near OSTM groundtracks (ACTION). In collaboration with the Nat. Tech. Univ. of Athens (NTUA), the Hellenic Navy Hydrographic Service (HNHS) and the Hellenic Center for Marine Research (HCMR), the original network is expanding to cover all of the Aegean area, from the northernmost site at THASOS to the southernmost one on GAVDOS. The south Aegean is already adequately covered from four tide gauge sites equipped with CORS GNSS: at MANI-KARA VOST ASI on southern Peloponnese, EMPORIO on the island of Chios, KASTELI on northern Crete and PALEKASTRO on the easternmost edge of Crete. Additional tide gauges and GNSS will now be deployed at KYMI-EVIA and NEA SKIONI, before the end of 2012, to densify the network in the mid- and northern Aegean. The primary purpose of the extended network is the absolute calibration and validation of altimetry missions through the continuous monitoring of sea level and tectonics at locations near the OSTM mean groundtrack. This Aegean-wide network samples at the moment the OSTM/Jason-2 tracks 18, 33, 94, 109, and 185, some of them in more than one location. It will support current and future altimeter missions JASON-2/3, ENVISAT, Cryosat-2, HY-2A, JASON-CS and SWOT, especially the latter, requiring calibration over an area rather than a single track. In discussions with HCMR we have also reached agreement for the future use of their open-sea buoys once we outfit them with CORS GNSS receivers. Furthermore, HNHS has a funded proposal to obtain new, state-of-the-art tide gauges with GNSS receivers to replace their old equipment throughout their Aegean network, and for two additional buoys (NOAA’s DART II type) and equipment for open-sea environmental monitoring. The main thrust of the project at the moment is to connect the currently deployed equipment with the global grid so that the data can be collected and made available in near real-time (e.g. on GTS). Our facilities will contribute the collected data to many other projects in the area (CLIVAR, WMO initiatives, IOC, GCOS, GOOS, GGOS, etc.) and the European Tsunami Warning System (ETWS). We will present the latest results from the current network and the latest bias estimates for OSTM/Jason-2.
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