Field samples were collected biweekly from a coastal site in Agios Kosmas, over a 26-year period between November 1988 and April 2015, as well as, with gaps, from June 2015 to June 2018.

Measurements of atmospheric and oceanographic variables (wind speed and direction, relative humidity, dew point, atmospheric pressure and temperature, sea temperature, pressure and salinity) were collected from the Kalloni Bay mooring (26.2084, 39.1677) in Lesvos Island. The reference for this dataset is found at the scientific publication https://doi.org/10.17882/100845.

Time series of biogeochemical and biological water-column data from open and deep-sea areas of the Greek Seas. The dataset includes historical data, as well as data collected within the framework of the CLIMPACT I and II projects using sediment traps.

The data concern nutrient concentrations in the water column from five selected stations in the Cretan Sea and the southeastern Ionian Sea. The samples were collected during the oceanographic cruise that took place in April 2025 within the framework of the CLIMPACT project. Water samples were collected using the rosette sampling system aboard the R/V AEGAEO, at discrete depths throughout the water column, from the surface to the seabed at each station. Depending on the maximum depth of each station, samples were collected from 12 to 18 discrete depths. The...

Samples for phytoplankton pigments in the water column were selected at 3 discrete points/stations in the Cretan Sea, during an oceanographic cruise conducted in April 2025 under the CLIMPACT project. Data include phytoplankton pigments analyses from 6 discrete depths at each station. Samples were taken with Niskin bottles and initially processed on board, while finally processed and analysed via HPLC method at HCMR Crete.

Data of hydrological parameters in the water column selected at 11 discrete points in the Cretan and southeast Ionian Sea, during an oceanographic cruise conducted in April 2025 under the CLIMPACT project. Data include pressure, in-situ temperature, potential temperature, salinity, potential density σθ and dissolved oxygen, from surface to bottom. Data were sampled with shipborne CTD probe.

Hourly values of hydrological data in the area of Antikythira strait, produced by a marine mooring deployed by HCMR. The monitoring instruments have been positioned at two depths: a) Close to the bottom (approximately 895 m) and b) At intermediate depth (325 m). The mooring site is found at latitude 35ο 36.8 N and longitude 23o 32.3 E.

This dataset contains blue carbon data from monospecific Posidonia oceanica meadows in the South Aegean Sea, including the Saronikos Gulf, the Cyclades Archipelago, the Dodecanese Archipelago and Crete Island. The dataset includes information from 42 sampling sites and 123 sediment cores collected between 2013 and 2023. The file provides sampling-site information, geographic coordinates, water depth, sampling year, sediment-core characteristics, core compaction, slicing resolution and laboratory processing methods. It also includes mean values for sedimen...

Zooplankton was collected at 10 stations in the epipelagic zone from 200 m up to the surface layer by vertical hauls (0.5m s−1) of a WP-2 standard net (Hydrobios) with 200 μm mesh size. The nets were carefully rinsed and the samples were halved, on board with a Folsom splitter. The first half was used for dry mass biomass determination and the other half was preserved in a seawater sodium tetraborate buffered formaldehyde solution (4% final concentration) for later determination of zooplankton composition and abundance. This data collection was funded by ...

Hourly values of hydrological data in the area of Antikythira strait, produced by a marine mooring deployed by HCMR. The monitoring instruments have been positioned at two depths: a) Close to the bottom (approximately 875 m) and b) At intermediate depth (325 m). The mooring site is found at latitude 35ο 36.8 N and longitude 23o 32.3 E.