CTD profiles in western Sardinia (2000 - 2004), western Mediterranean
|Temporal extent||2000-05-28 -2004-01-26|
|Author(s)||Ribotti Alberto1, Di Bitetto Massimiliano2, Borghini Mireno3, Sorgente Roberto1|
|Affiliation(s)||1 : CNR-IAS, Oristano, Italy
2 : CNR-DSB, Roma, Italy
3 : CNR-ISMAR, La Spezia, Italy
|Keyword(s)||Sardinia, water masses, mesoscale activity, hydrological data, western Mediterranean, CTD profiles|
Hydrological data have been collected during 7 oceanographic cruises, named medgoos, organized in the Sardinia Sea and in the Sardinia Channel between May 2000 and January 2004 (table 1) by the Italian Consiglio Nazionale delle Ricerche (CNR).
The 61,30 meters long R/V Urania of CNR was used during all cruises. Data of conductivity, temperature, dissolved oxygen (DO) and Chlorophyll-a fluorescence (Chl-a) were acquired by a SBE911 plus CTD probe (Sea-Bird Inc.) equipped with a 24 Niskin bottle rosette for water column samples collection. The CTD data were quality checked and processed by Seasoft software. Then salinity was checked against the on-board analyses of water samples by a Guildline-Autosal salinometer. The same for DO data checked against Winkler titration analyses. Chl-a data were not calibrated, so they are reported as Relative Fluorescence Units. During cruises from medgoos4 to medgoos7 acquired temperature data were checked at defined depths against inverted thermometers installed in correspondence of the Niskin bottles number 1, 3, 5, 7 of the rosette sampler. Pre-cruise and post-cruise calibrations of the sensors were performed at the SACLANT Center (now NATO-CMRE) of La Spezia (Italy). Redundant sensors were often used for both temperature and salinity measurements, apart during the medgoos1 and medgoos2 cruises.
The vessel was positioned using an integrated navigation system consisting of two DGPS antennas managed by Andrews Hydrographics software installed on HP 386, 33 MHz PCs.
The data set is provided per cruise as ODV Spreadsheet files in TXT format:
|Utilisation||These data are published without any warranty: the user assumes all risk arising from his/her use of these data. These data are intended to be quality controlled, but it is possible that they contain errors. It is the unique responsibility of the user to assess if the data are appropriate for his/her use, and to interpret them accordingly. We welcome users to ask questions and report problems to the contact addresses listed in the data files|
|Acknowledgments||The data used in this work have been collected in the framework of several national and European projects, i.e. the Italian MIUR project SIMBIOS (Operative Programme of the Marine Environment Plan, Cluster C10, Project n. 13 – D.n. 778.RIC); the EU Marie Curie Host Fellowship ODASS (HPMD-CT-2001-00075); the EU MAMA (EVR1-CT-2001-20010), the EU MFSPP (MAS3-CT98–0171); the EU MFSTEP (EVK3-CT-2002-00075).|
• pressure: a Digiquarz 4000 pressure transducer was used. The transducer had a resolution of 0.01 ppm, oscillator frequency 34 KHz - 38KHz and temperature range 0 °C - 125 °C;
• temperature: a SBE-3/F thermometer with response time of 70 ms, temperature range -5 ° - + 35 °, accuracy about 0.004 ° C per year, resolution 0.0003 ° C;
• conductivity: a SBE-4 sensor with a range of 0.0 - 7 S/m, resolution 0.00004 S/m, accuracy about 0.0003 S/m per month and response time of 0.085 sec with pump or 0.17 sec without pump;
• dissolved oxygen: a SBE-13 Beckman/YSI sensor with a range of 0 - 15 ml/l, accuracy of 0.1 ml/l, resolution 0.01 ml/l and response time 2 sec at a temperature of 25 °C during cruises medgoos1, 2, 3, 4. During cruises medgoos5, 6, 7 a SBE-43 polarographic membrane sensor for pumped CTD applications with titanium (7000 m) housing was used with a range of 120% of surface saturation in all natural waters, accuracy of ±2% of saturation
• fluorescence: a Sea Tech Inc. fluorometer with energy emitted by the flash lamp of 0.25 J for flash, temperature range 0 ° - 25 °C, resolution 0.15 mg/l.