Implementation of a Real-time Oceanographic Network for the Aegean Sea and Eastern Mediterranean Regions: Action
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Citation of Original PublicationPavlis, E. C.; Evans, K.; Paradissis, D.; Milas, P.; Massinas, B.; Evangelidis, D.; Papachristos, A.; Implementation of a Real-time Oceanographic Network for the Aegean Sea and Eastern Mediterranean Regions: Action; GODAE Oceanview Symposium 2013; https://www.godae.org/~godae-data/Symposium/GOV-posters/S2.1-10-Pavlis.pdf
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Sea level monitoring is a common objective of GOOS and GGOS, both systems under GEOSS, but with quite different goals. Tide gauges provide ground truth for altimeter calibration and in situ monitoring of MSL, while precise positioning of such sites with Continuously Observing Reference Stations (CORS) help separate local tectonics from oceanographic signals. We are presenting here the extension of the regional eastern Mediterranean Altimeter Calibration network —eMACnet, to an Aegean-wide network in the Eastern Mediterranean. Coastal tide gauges equipped with GNSS receivers and offshore buoys near OSTM groundtracks (ACTION - Altimeter Calibration and Tectonics Inference Oceanographic Network) will provide better area coverage and timely data availability in support of satellite calibration, MSL and environmental monitoring, tsunami warning, etc. The original network was established with EU’s 5th FP and NASA’s OSTMST funding in 2001. Since 2008, our collaboration with the Dionysos Satellite Observatory of the Nat. Tech. Univ. of Athens (DSO/NTUA) and the Hellenic Navy Hydrographic Service (HNHS) helped expand the original network to cover all of the Aegean area, from the northernmost site at THASOS to the southernmost one on GAVDOS. Most of our tide gauge sites are equipped with CORS GNSS: MANI (Peloponnese), EMPORIO ( C h i o s ) , G AV D O S , K A S T E L I a n d PALEKASTRO (on Crete), while GAVDOS and KASTELI data are submitted in real time to IOC. ACTION’s primary purpose is the absolute calibration and validation of altimetry missions thence our choice of locations near the OSTM mean groundtrack, sampling OSTM tracks 18, 33, 94, 109, and 185, some of them in more than one location. Current and future missions are supported, JASON-2/3, Cryosat-2, HY-2A, JASON-CS and SWOT, especially the latter, requiring calibration over an area rather than over a single track only. HNHS is modernizing its tide gauge network of 21 sites, with digital systems, some already part of the IOC family. Furthermore, HNHS is in the process of installing CORS receivers by their equipment and connecting their digital systems to the global grid in near real-time. HNHS plans also to purchase and deploy (tentatively in the south Ionian sea and south of Gavdos), two open-sea buoys (NOAA’s DART II type) along with equipment for opensea environmental monitoring, connecting them eventually to the global grid in near real-time and contributing to various international projects in the area (EUROGOOS, WMO initiatives, IOC, GCOS, GOOS, GGOS, etc.) and the European Tsunami Warning System (ETWS).
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