DATA BASE DESCRIPTION (EDMED Part B)

*DATASET-NAME: CTD data collected within SINAPSI Scientific cruises, aimed at monitoring a regional transient climatic event in the Ionian Sea waters.

*TIME-PERIOD: 1997, November, 20 to present.

*GEOGRAPHIC-COVERAGE: CTD vertical profiles along two corridors in the Ionian Sea, running W-E (from the Sicily Channel to the Matapan Trench) and NE-SW (from the Matapan Trench, across the Mediterranean Ridge, up to the Syrte Basin), respectively (data set limits: South: 34N; North: 36N; West: 16E; East: 23E)

*PROJECT: SINAPSI (Seasonal, Interannual and decAdal variability of the atmosPhere, oceanS and related marIne ecosystems) Project in the Mediterranean Sea.

*PARAMETERS: CTD, Physical Oceanography. Dissolved oxygen content.

*INSTRUMENTS: CTD SeaBird 911 plus. Added to the standard instrument: 1 polarographic sensor, 1 tranmissivity meter, a 2.nd couple of temperature and electrical conductivity sensors, 1 Sea Tech scattering meter. In the brines: CTD Idronaut mod. 316

*SUMMARY: the CTD apparatus is widely used to register, with continuous vertical records, the main physical parameters of the water column. Sensors are fully calibrated, allowing to easely compare data acquired using different instruments. In the URANIA 15/97 cruise, CTD allowed for delimiting in space the actual extension of the transient climatic event in the Ionian Sea waters and monitoring in time its evolution, comparing actual data with those acquired in 1993. Data acquisition was made at 24 Hz frequency, during descent only, at a constant speed of about 1 m/s. Detailed monitoring of the brines in the brine lakes of the Mediterranean Ridge was also attempted. The instrumental configuration was always maintained as indicated in "*INSTRUMENTS" (CTD SeaBird + additional sensors), except in brines, where the CTD Idronaut, although less accurate than the SeaBird, offered the advantage of a larger range in measuring salinity. In addition to standard sensors, the CTD SeaBird apparatus is equipped also with a polarographic cell for measuring the dissolved oxygen content in water. The cell is crossed by a light electric current (of the order of m A), proportional to the amount of oxigen diffusing through a teflon wall.

*REFERENCE: CTD SeaBird 911 plus and CTD Idronaut mod. 316 Users Manuals; SINAPSI Project: field report of the Urania 15/97 cruise (in italian)

*DATA-WEBSITE: http://doga.ogs.trieste.it/sinapsi/

*ORIGINATOR: Dr. P. Scarazzato

*CENTRE: National Institute of Oceanography and Experimental Geophysics (OGS) of Trieste

*STORAGE-MEDIUM: 12 digital files (about 15 MB in zipped format)

*AVAILABILITY: For bona fide academic research, the data set is available on request to OGS

*SUPPLY-DETAILS: files in standard CTD format

*CONTACT: Dr. P. Scarazzato (spaolo@ogs.trieste.it), tel: +39 040 2140217; fax: +39 040 2140266

*COMPLETED-BY: B. Della Vedova and B. Manca (bmanca@ogs.trieste.it)

*CURRENCY-DATE: 2001-04-27

*REVISION-DATE: 2002-02-12