DATA BASE DESCRIPTION (EDMED Part B)

*DATASET-NAME: Scientific cruise URANIA 15/97 (SINAPSI Project), monitoring a regional transient climatic event in the Ionian Sea waters: HF stations

*TIME-PERIOD: 1997, November, 22 to 1997, December, 9

*GEOGRAPHIC-COVERAGE: 12 groups of HF penetrations in the bottom sediment, located 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: 17E; East: 23E)

*PROJECT: SINAPSI (Seasonal, Interannual and decAdal variability of the atmosPhere, oceanS and related marIne ecosystems) Project in the Mediterranean Sea. Coordinating Body: CNR, Istituto Geologia Marina (IGM), Bologna, Italy

*PARAMETERS: heat flow, temperature in sediments, thermal transients, Ionian abyssal plain, Victor Hensen sea-hill, Mediterranean Ridge, Matapan Trench, brines, anoxic basins

*INSTRUMENTS: GTA (Gruppo Tecniche Avanzate, Trieste, Italy) and ARGUS II (Applied Microsystems Ltd., Sidney, B.C., Canada) HF probes

*SUMMARY: GTA and ARGUS probes are programmable, multi-penetration instruments equipped with thermistors for in situ determinations in the sea bottom of both temperature (T) and thermal conductivity (K) versus depth. Penetration into the sediment is obtined by gravity. ARGUS records continuously (10 s sampling rate) T samples from its 16 sensors, both when in water and in the sediment. Normally, a HF estimate for each penetration is requested; in SINAPSI experiment, on the contrary, the important results are the vertical distributions of T and K in the sediment. Due to descent of warm, saline water from Egean Sea into the Matapan Trench, the boundary conditions at the top of the sediment suddently changed (about half a degree higher), inducing an important thermal perturbance, presently affecting the first few meters of the deep sea sediments, to penetrate progressively into the sea bottom. Careful sampling of this perturbed thermal field in the mud allows us to estimate both amplitude and age of the thermal event in the water mass. So, the goal of these measurements is to understand the space- and time- evolution of the transient climatic event now in progress in the Ionian Sea waters, monitoring its thermal signal in the sea bottom and comparing the actual data with those acquired in 1993

*REFERENCE: ARGUS II Reference and User Manuals; MAST II / MEDRIFF Project: field report of the Urania cruise 93/19 (in italian); SINAPSI Project: field report of the Urania 15/97 cruise (in italian)

*DATA-WEBSITE: http://sinapsi.cineca.it

*ORIGINATOR: Dr. B. Della Vedova

*CENTRE: Dept. of Civil Engineering, Division of Georesources and Environmental Engineering (GEODIC), University of Trieste

*STORAGE-MEDIUM: a database, organizing both the experimental data set and its following processing (about 80 MB).

*AVAILABILITY: For bona fide academic research, the data set is freely available on request to Dr. B. Della Vedova.

*SUPPLY-DETAILS: the database, composed by ASCII fileshas to be processed with a software package written at GEODIC expressly for it.

*CONTACT: Dr. B. Della Vedova, (dellavedova@univ.trieste.it), tel: +39 040 676 7159, fax: +39 040 676 3497

*COMPLETED-BY: B. Della Vedova (dellavedova@univ.trieste.it)

*CURRENCY-DATE: 2001-04-27

*REVISION-DATE: 2001-05-15