During 33 years, from January 1986 to December 2018, seawater temperature has then been registered daily at 4pm in the pumping station([1])-[#_ftn1] of the Nuclear Power Station of Flamanville located 25 km south west of Cherbourg. In order to cool their condensers, seawater has been drawn off with a water flows of 45 m3s-1. The monthly average seawater temperature minimum has been registered in February (8,90°C), with extremes values in 1986 (6,80°C) and 2016 (10,33°C). The maximum of the seawater temperature has been registered in august (17, 81°C), varying from 16,28°C in 1986 to 18,60°C in 2014. The annual average seawater temperature is 13,09°C when using monthly average values and 13,13°C using all 12053 individuals values. Mean annual values differ from 11,37 °C in 1986 to 14,18 °C in 2014. Before this time-series of 33 years, the only dataset available had been registered between 1904 and 1923 and had been published in 35 by J. R. Lumby([5])-[#_ftn5] at 12 meter depth to get an additional time-series of 999 seawater temperatures recorded from September 1976 to May 1980, in a discontinuous way. An increase of 1,2 °C in the annual mean seawater temperature is observed between the first and the third time-series. A key point when analysing those three time-series is to keep in mind the difference in the location, depth and in the sensor. Conclusions from comparisons of those three time series need to be done carefully. Those data are now updated each year before being published in an annual report for Ifremer and EDF([6])-[#_ftn6] about the ecological and fishery monitoring of Flamanville Nuclear Power Station location.   ([1])-[#_ftnref1] Geographical coordinates of the pumping station : 49,53 N – 1,88 W ([2])-[#_ftnref2] LUMBY, J.R. 1935.- « Salinity and temperature of the English Channel ». Fishery Investigations, series II, vol. XIV, n°3 ([3])-[#_ftnref3] Coordonnées géographiques du R 26 : 49° 37’ N – 02° 14’ W ([4])-[#_ftnref4] Today Laboratoire National d'Hydraulique et Environnement (LNHE) ([5])-[#_ftnref5] Geographical coordinates  of Fertex and Aanderaa : 49° 32’ 29’’N -  001° 53’ 49’’W ([6])-[#_ftnref6] ROPERT M., E. ANTAJAN, G. COURTAY, L. DREVES, A. FOVEAU, T. HERNÀNDEZ FARIÑAS, C. LOOTS, I. SCHLAICH , B. SIMON. (2019). Surveillance écologique et halieutique du site électronucléaire de Flamanville : Année 2018. RST/ODE/UL/LERN-19.001. Conv. EDF C4493C0850. 217 p. Important Note: This submission has been initially submitted to SEA scieNtific Open data Edition (SEANOE) publication service and received the recorded DOI. The metadata elements have been further processed (refined) in EMODnet Ingestion Service in order to conform with the Data Submission Service specifications.

We gathered ocean profiles during the first two floes of the N-ICE2015 ice camp north of Svalbard with IAOOS ocean profilers. Between January and March 2015, four ocean profilers were deployed: two below a full IAOOS platform (500 m long cable) during floe 1, two on an 800 m long instrumented line in a tent-covered testing-hole during floe1 and floe 2. The ocean profilers, from French manufacturer NKE (PROVOR SPI), carried a Seabird SBE41CP CTD (Conductivity, Temperature, Depth) with an Aanderaa 4330 optode for dissolved oxygen (DO). The profilers were set to perform two profiles a day from 500 m upward (800 m from testing hole) starting at 6 am and 6 pm. They provided the first winter data in the region with a total of 138 profiles during floe 1 (January 15- February 21) with 62, 50, and 26 profiles for IAOOS7, IAOOS8, and IAOOS 9, respectively and 16 profiles during floe 2 (February 24 - March 19- IAOOS 11 from testing hole). Following quality control, we retain all the temperature profiles and remove 1% of the salinity profiles. Finally, the accuracy is estimated to be 0.002°C in temperature, and 0.02 g/kg in salinity. Several profiles are missing or incomplete because of high drift speeds (> 0.4 m s-1) impeding the ascent of the profiler. There are no bottle DO measurements during Floe 1 to calibrate the DO data. DO accuracy is estimated comparing the deep values of DO concentration (rather stable at 500m) between the three profilers. A difference of 3 µmol L-1 is observed between IAOOS 8 and 9, and IAOOS 7. An offset of 3 µmol L-1 is then applied to the oxygen data from IAOOS7 and the accuracy of the data is estimated to be at ±3 µmol L-1. The vertical resolution of the processed CTD data is 1 dbar in the upper 400 dbars, 5 dbars from 400 to 550 dbars and 10 dbars from 550 to 850 dbars. The vertical resolution in dissolved oxygen is 2 dbars over all depths. Important Note: This submission has been initially submitted to SEA scieNtific Open data Edition (SEANOE) publication service and received the recorded DOI. The metadata elements have been further processed (refined) in EMODnet Ingestion Service in order to conform with the Data Submission Service specifications.

Sea water temperature was monitored on a continuous basis from the start-up of the laboratory at Carna (Co. Galway) in July 1974 until 2003, when a rebuild of a section of the laboratory removed the recorder. The sea water intake pipe extended about 100m beyond the end of the pier, the pipe running in gullies between the rocks, weighed down with concrete weights to a point beyond the low water springs mark. It was 4inch Hydrodare pipe, pinned along the outside of the pier wall, to the lab, where it entered the building through a constant head arrangement of the pipework. The total distance from intake to the lab was about 200m. A pump house was built on the seaward side of the pier. The pumps were centrifugal patterns, and the pumps were change dover the years as larger volumes were required. The minimum flow rate was 600L per minute. This flow would increase slightly on a high tide. After installation, for a period of about three months, the displayed temperature was checked against the temperature at the tide edge and no discernible difference was noted. Pipe intake at approx. 53° 18.55'N, 9° 49.75'W. The measurement device was initially a Cambridge Instruments 10 inch circular chart recorder fitted with a seven day rotation motor. The first measurement system was a MIS expansion probe, connected to the recorder by a capillary, the actual measuring bulb was contained in a stainless steel pocket fitted into the incoming seawater line. On changing the chart, the temperatures were extracted by hand and then typed up. The temperatures were taken for midnight, 6am, noon and 6pm. Where the clocks went forward in Spring for Summer Time or back in Autumn to GMT, the changeover on the chart would usually have been on the following Monday morning about 9am. When the recorder pattern became outdated around 1998, and spares difficult to obtain, the recorder was changed for a Cambridge Instrument P100L, 4 inch strip chart recorder. The measuring probe was a Pt100 platinum resistance thermometer, BS1904 specification, again fitted into a stainless steel pocket fitted into the supply line. The charts on this instrument were changed on a fortnightly basis and again, the six-hourly temperatures extracted by hand and typed up.

oceanographic data as recorded by the fixed station in Gaeta harbor

A comprehensive set of oceanographic data were collected in Fortune Bay, a broad, mid-latitude fjord located on the south coast of Newfoundland (Canada). The dataset was gathered in partnership with IFREMER who collected data around the adjacent French archipelago of Saint-Pierre and Miquelon. The dataset consists of data from taut-line moorings, land-based stations (a tide gauge and a couple of weather stations) and CTD profiles performed during mooring maintenances (~every 6 months). Parameters covered by the moorings include water column temperature (thermistor chain), salinity (2 points/depths per mooring), dissolved oxygen (on a limited number of moorings, within the surface layer) as well as current profiles (ADCP). Land-based stations monitored water level and temperature (tide gauge) and wind speed and direction, atmospheric pressure, air temperature and solar radiation (weather station). CTD profiles include dissolved oxygen for the most part. The program lasted two full years from May 2015 to May 2017 and sampling interval varied from 1-60 min depending on the instrument. Important Note: This submission has been initially submitted to SEA scieNtific Open data Edition (SEANOE) publication service and received the recorded DOI. The metadata elements have been further processed (refined) in EMODnet Ingestion Service in order to conform with the Data Submission Service specifications.

Sea level - Genova

Sea Level La Spezia station

Sea level Imperia Station

Civitavecchia mooring

La Spezia mooring