PYLOS Service Activities

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SA Number: 15.1

Name of the SA: Pylos – Southern Ionian Sea Water Column and Seabed Observations to assess deep water thermohaline circulation

Institute: Hellenic Center for Marine Research – Institute of Oceanography

Name:

Observatory manager: L. Perivoliotis (lperiv@hcmr.gr)

Short SA Description:

Pylos – Southern Ionian Sea Water Column and Seabed Observations to assess deep water thermohaline circulation

SA Description:

The Mediterranean Sea has often been named as a mini-ocean or a natural geophysical laboratory since it possesses its own conveyor belt:  Surface water inflows from Atlantic Ocean and travels eastwards all the way to the Levantine basin, where it becomes denser sinking into deeper layers and flows into the opposite direction out of the basin. In the Eastern basin, there are two areas where deep water is formed – the Adriatic and the Aegean Seas. Recent developments have shown that both sites have the potential to contribute to the waters filling the deep Ionian and Levantine basins (deeper than 2000m down to the bottom). Less dense water, flows in the intermediate layers, is formed primarily in the Levantine as well as in the Cretan Sea. The Pylos site in the SE Ionian is a crossroad where all the above intermediate and deep water masses meet. It is especially on the pathway of the Aegean Sea dense water that travels to the north along the western coast of Greece. Furthermore, the observatory is located in a very geologically active area with many earthquakes and landslides, which are potential sources of tsunamis that might affect the entire Eastern Mediterranean Sea.

The Service Activity is provided since the beginning of the project, while all the data and the derived products are freely available to the community. Data are hosted in the MonGOOS Data Center as netCDF files containing both data and metadata, where the Pylos observatory can be located by its WMO code 68422. Real time quality control procedures are applied to the data upon their collection, while twice a year extended validation procedures are also applied, taking into account neighboring information from different platforms and the latest climatology. Visualization products (daily and monthly mean time series of the measured parameters) are available through the FixO3 website, while data download in monthly basis is also possible through a dedicated FixO3 observatory webpage.

Provided products include: Atmospheric data : Sea level atmospheric pressure, Air temperature (dry), Gust wind speed, Wind speed, Wind direction relative true north. Marine data : Surface current speed, Surface current direction relative true north, Significant wave height, Wave direction relative true north, Average Zero Crossing wave period, Sea pressure, temperature and salinity at various depths, Oxygen at the sea floor.  Due to a major failure in the inductive cable, the underwater component of the station was taken out of order in April 2013 and the normal operation was fully restored during November 2014. Data form the seabed component are available for the period September 2013-March 2014

Visualisations:

Picture 1: Surface float of Pylos observatory

Picture 1: Surface float of Pylos observatory

 

Picture 2: The seabed platform of the Pylos observatory ready for transportation to the site location

Picture 2: The seabed platform of the Pylos observatory ready for transportation to the site location

 

Picture 3: Temperature recordings of the water column down to 1000m since fall of 2007

Picture 3: Temperature recordings of the water column down to 1000m since fall of 2007

 

Recordings of the significant wave height since fall of 2007

Picture 4: Recordings of the significant wave height since fall of 2007

One click links to your SA:

http://www.fixo3.eu/observatory-data-PYLOS/ Data visualization for daily and monthly values

http://mongoos.hcmr.gr/data/fixO3/ Pylos observatory monthly datasets (NetCDF, availability since September 2013)

http://oceanobs.mongoos.eu/platform_info.php?tspr=TS&type=MO&name=68422&startDt=2015-01-01&endDt=2015-10-13 Pylos observatory recordings at MonGOOS data portal (updated on daily basis)