The data refer to fifteen-day and monthly measurements of sinking particulate matter in the marine areas of the northern Aegean, Cretan, Ionian Seas and the Levantine/northeastern Mediterranean. The collection instruments were PPS3/3 Technicap sediment traps with collection areas of 0.125 m² and 12 receiving cups. The locations and corresponding depths of the trap deployments for the different areas are as follows: Historical biogeochemical flux data for the time period 2015: A) Northern Aegean Sea (station M2, Athos Basin): 39°58.16′ N, 24°43.48′ E; d...

Time series with in-situ data of the Poseidon system for the monitoring of the Greek Seas. Data include atmospheric (such as air temperature, wind speed and direction, waves, currents) and marine physical and biochemical parameters (such as temperature, salinity, chlorophyll-a, dissolved oxygen, turbidity). Data have been collected by several measuring platforms like fixed buoys, Argo floats, oceanographic cruises, FerryBox systems. They have been subject to delayed mode quality control and expand from 25/5/2000-27/5/2020.