OS Ocean Science OS Ocean Sci. 1812-0792 Copernicus Publications Göttingen, Germany 10.5194/os-3-245-2007 The improvements of the ships of opportunity program in MFS-TEP Manzella G. M. R. 1 Reseghetti F. 1 Coppini G. 2 Borghini M. 3 Cruzado A. 4 Galli C. 3 Gertman I. 5 Gervais T. 6 Hayes D. 9 Millot C. 6 Murashkovsky A. 5 Özsoy E. 7 Tziavos C. 8 Velasquez Z. 4 Zodiatis G. 9 ENEA CLIM, Forte S.Teresa, Pozzuolo, 19036 Lerici, Italy INGV, Via Donato Creti 12, 40128 Bologna, Italy CNR ISMAR, Sezione di La Spezia, Pozzuolo, 19036 Lerici, Italy CSIC CEAB, Access Cala St. Francesc, 14, 17300 Blanes, Spain IOLR, POB 8030, Tel Shikmona Haifa 31080, Israel CNRS LOB COM, POB 330, ZPB 83507 La Seyne-sur-mer, France IMS METU, PK 28 Erdemli, Icel 33731, Turkey HCMR, POB 712, 19013 Anavissos, Attiki, Greece Oceanography Centre, University of Cyprus, Nicosia, Cyprus 23 05 2007 3 2 245 258 Copyright: © 2007 G. M. R. Manzella et al. 2007 This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Generic License. To view a copy of this licence, visit https://creativecommons.org/licenses/by-nc-sa/2.5/ This article is available from https://os.copernicus.org/articles/3/245/2007/os-3-245-2007.html The full text article is available as a PDF file from https://os.copernicus.org/articles/3/245/2007/os-3-245-2007.pdf

The Ships Of Opportunity Program in the Mediterranean Sea was established at the end of 1999, in the framework of the Mediterranean Forecasting System – Pilot Project (MFS-PP). Many improvements have been made in data collection, transmission and management. Calibration of selected XBTs and a comparison of XBTs vs. CTDs during some research cruises have assured the quality of the data. Transmission now allows receiving data in full resolution by using GSM or satellite telecommunication services; management is offering access to high quality data and view services. The effects of technological and methodological improvements in the observing system are assessed in terms of capability to represent the most important circulation features. The improved methodologies have been tested during the Mediterranean Forecasting System – Toward Environmental Prediction (MFS-TEP) – Targeted Operational Period (MFS-TOP), lasting from September 2004 to February 2005. In spite of the short period of measurements, several important aspects of the Mediterranean Sea circulation have been verified, such as eddies and gyres in the various sub-basins, and dense water formation processes in some of them (vertical homogeneous profiles of about 13°C down to ~800 m in the Provençal, and of about 14.9°C down to ~300 m in the Levantine have allowed defining an index of dense water formation).

 References AODC: Guide to MK12 – XBT System (Including Launching, returns and faults), Australian Oceanographic Data Centre (AODC), METOC Services, 1–63, 1999. AODC: Expendable Bathythermographs (XBT) delayed mode. Quality control manual. Australian Oceanographic Data Centre (AODC), Data Management Group, Technical Manual 1/2001, 1–24, 2001. Brenner, S.: Structure and evolution of warm core eddies in the Eastern Mediterranean Levantine Basin, J. Geophys. Res., 94, 12 593–12 602, 1989. Cook, S. and Sy, A.: Best guide and principles manual for the Ships Of Opportunity Program (SOOP) and EXpendable Bathythermograph (XBT) operations. Prepared for the IOC-WMO-3rd Session of the JCOMM Ship of Opportunity Implementation Panel (SOOPIP-III), 28–31 March 2000, La Jolla, California, USA, 1–26, 2001. Demirov, E., Pinardi, N., Fratianni, C., Tonani, M., Giacomelli, L., and DeMey, P.: Assimilation scheme of the Mediterranean Forecasting System: operational implementation, Ann. Geophys., 21, 189–204, 2003. Emelianov, M., Font, J., Turiel, A., Millot, C., Solé, J., Poulain, P.-M., Julià, A., and Vitrià, M.-R.: Transformation of Levantine Intermediate Water tracked by MEDARGO floats in the Western Mediterranean, Ocean Sci., 2, 281–290, 2006. Fusco, G., Manzella, G. M. R., Cruzado, A., Gacic, M., Gasparini, G. P., Kovacevic, V., Millot, C., Tziavos, C., Velasquez, Z., Walne, A., Zervakis, V., and Zodiatis, G.: Variability of mesoscale features in the Mediterranean Sea from XBT data analysis, Ann. Geophys., 21, 21–32, 2003. Gascard, J. C.: Mediterranean deep water formation, baroclinic instability and oceanic eddies, Oceanologica Acta, 1, 3, 315–330, 1978. Groom, S., Herut, B., Brenner, S., Zodiatis, G., Psarra, S., Kress, N., Krom, M. D., Law, C. S., and Drakopoulos, P.: Satellite derived spatial and temporal biological variability in the Cyprus Eddy, Deep Sea Res. II, 52, 2990–3010, 2005. Hamad, N., Millot, C., and Taupier-Letage, I.: The surface circulation in the eastern basin of the Mediterranean Sea: new elements, Proceeding of the Ankara Conference, October 2002, 2–9, 2004. Hamad, N., Millot, C., and Taupier-Letage, I.: A new hypothesis about the surface circulation in the eastern basin of the Mediterranean Sea, Progress in Oceanography, 66, 287–298, 2005. Hamad, N., Millot, C., and Taupier-Letage, I.: The surface circulation in the eastern basin of the Mediterranean Sea, Scientia Marina, 70(3), 505–517, 2006. Hecht, A., Robinson, A., and Pinardi, N.: Currents, water masses, eddies and jets in the Mediterranean Levantine basin, J. Phys. Oceanog., 8, 1320–1353, 1988. Hecht, A. and Gertman, I.: Physical features of the eastern Mediterranean resulting from the integration of POEM data with Russian Mediterranean cruises, Deep-Sea Res. I, 48, 1847–1876, 2001. Klein B., Roether W., Manca B.B., Bregant D., Beitzel V., Kovacevic V., and Lucchetta, A.: The large deep water transient in the eastern Mediterranean, Deep Sea Res. I, 46, 371–414, 1999. Klein, B., Roether, W., Civitarese, G., Gacic, M., Manca, B. B., and Ribera d'Alcalà, M.: Is the Adriatic returning to dominate the production of Eastern Mediterranean Deep Water?, Geophys. Res. Lett., 27, 3377–3380, 2000. Lascaratos, A. and Nittis, K.: A high resolution 3-D numerical study of intermediate water formation in the Levantine Sea, J. Geophys. Res., 103, 18 497–18 511, 1998. Leaman, K. D. and Schott, F.: Hydrographic structures of the convection regime in the Gulf of Lions, winter 1987, Journal Phys. Oceanogr., 21, 575–598, 1991. Malanotte Rizzoli, P., Manca, B. B., Ribera d'Alcalà, M., Theocaris, A., Brenner, S., Budillon, G., and Özsoy, E.: The eastern Mediterranean in the 80s and in the 90s: the big transition in the intermediate and deep circulation, Dynamics of Atmospheres and Oceans, 29, 365–395, 1999. Malanotte-Rizzoli, P., Manca, B. B., Marullo, S., and Özsoy, E.: The Levantine Intermediate Water Experiment (LIWEX) Group: Levantine basin – A laboratory for multiple water mass formation processes, J. Geophys. Res.-Oceans, 108(C9), 8101, https://doi.org/10.1029/2002JC001643, 2003. Manzella, G. M. R., Cardin, V., Cruzado, A., Fusco, G., Gacic, M., Galli, C., Gasparini, G. P., Gervais, T., Kovacevich, V., Millot, C., Petit de la Villeon, L., Spaggiari, G., Tonani, M., Tziavos, C., Velasquez, Z., Walne, A., Zervakis, V., and Zodiatis G.: Project improves monitoring of circulation variability in the Mediterranean Sea, EOS, 497–504, 2001. Manzella, G. M. R., Scoccimarro, E., Pinardi, N., and Tonani, M.: Improved near real time data management procedures for the Mediterranean ocean Forecasting System - Voluntary Observing Ship program, Ann. Geophys., 21, 21–32, 2003. Marullo, S., Santoleri, R., and Bignami, F.: The surface characteristics of the Tyrrhenian Sea: historical satellite data analysis, in: Seasonal and Interannual variability of the Western Mediterranean Sea, AGU Coastal and estuarine studies 46, edited by: La Violette, P. E., 135–154, 1995. MedAtlas Group: Specification for Mediterranean banking and regional quality controls. IFREMER, Direction Scientific, Sismer-Brest, SISMER/IS/94-014, pp 29, 1994. Millot, C.: The circulation of the Levantine Intermediate Water in the Algerian Basin, J. Geophys. Res., 92(C8), 8265–8276, 1987. Millot, C.: Circulation in the Western Mediterranean Sea, J. Mar. Syst., 20, 1–4, 423–442, 1999. Millot, C. and Taupier-Letage, I.: Circulation in the Mediterranean Sea. The handbook of environmental chemistry, Vol K (The Natural Environment and the Biological Cycles), Springer-Verlag Editor, 29–66, 2005a. Millot, C. and Taupier-Letage, I.: Additional evidence of LIW entrainment across the Algerian Basin by mesoscale eddies and not by permanent westward-flowing vein, Progress in Oceanography, 231–250, 2005b. Ovchinnikov, I. M., Plakhin, A., Moskalenko, L. V., Neglyad, K. V., Osadchii, A. S., Fedoseev, A. F., Krivosheya, V. G., and Votive, K. V.: Gidrologiia Sredizemnogo Moria. Gidrometeoizdat, Leningrad, 375 pp. (in Russian), 1976. Özsoy, E., Hecht, A., and Ünlüata, Ü.: Circulation and hydrology of the Levantine Basin. Results of POEM Coordinated Experiments 1985–1986, Progress in Oceanography, 22, 125–170, 1989. Özsoy, E., Hecht, A., Ünlüata, Ü., Brenner, S., Oguz, T., Bishop, J., Latif, M. A., and Rosentroub, Z.: A review of the Levantine Basin circulation and its variability during 1985–88, Dyn. Atmos. Oceans, 15, 421–456, 1991. Özsoy, E., Hecht, A., Ünlüata, Ü., Brenner, S., Sur, H.\'Y., Bishop, J., Latif, M. A., Rozentraub, Z., and Oguz, T.: A synthesis of the Levantine Basin circulation and hydrography, 1985–1990, Deep-Sea Res., 40, 1075–1119, 1993. Pinardi, N., Allen, I., Demirov, E., DeMey, P., Korres, G., Lascaratos, A., LeTraon, P.-Y., Maillard, C., Manzella, G., and Tziavos, C.: The Mediterranean ocean Forecasting System: first phase of implementation (1998–2001), Ann. Geophys., 21, 3–20, 2003. POEM Group: General Circulation of the Eastern Mediterranean Sea, Earth Sci. Rev., 32, 285–309, 1992. Raicich, F. and Rampazzo, A.: Observing system simulation experiments for the assessment of temperature sampling strategies in the Mediterranean Sea, Ann. Geophys., 21, 151–166, 2003. Reseghetti, F., Borghini, M., and Manzella, G. M. R.: Factors affecting the quality of XBT data – results of analyses on profiles from the Western Mediterranean Sea, Ocean Sci., 3, 59–75, 2007. Roether, W., Manca, B. B., Klein, B., Bregant, D., Georgopoulos, D., Beitzel, V., Kovacevich, V., and Luchetta, A.: Recent changes in the eastern Mediterranean deep water, Science, 271, 333–335, 1996. Smith, N. R., Harrison, D. E., Bailey, R., Delcroix, T., Hanawa, K., Keely, B., Meyers, G., Molinari, B., and Roemmich, D.: The role of XBT sampling in the ocean thermal network, OCEANOBS St. Raphael 18–22 October, 1999. Sur, H.\'Y., Özsoy, E., and Ünlüata, Ü.: Simultaneous deep and intermediate depth convection in the northern Levantine Sea, winter, Oceanol. Acta, 16, 33–43, 1992. Zodiatis, G., Manca, B., and Balopoulos, E.: Synoptic, seasonal and interannual variability of the warm core eddy south of Cyprus, SE Levantine basin, Rapp. Comm. Int. Mer Medit., 36, 89–90, 2001. Zodiatis, G., Drakopoulos, P., Brenner, S., and Groom, S.: Variability of the Cyprus warm core Eddy during the CYCLOPS project, Deep Sea Res. II, 52, 2897–2910, 2005a. Zodiatis, G., Drakopoulos, P., Gertman, I., Brenner, S., and Hayes, D.: The Atlantic Water Mesoscale Hydrodynamics in the Levantine Basin, 27th CIESM Monograph on Strategies for understanding mesoscale processes, pages 131, Villefranche-sur-mer, 25–28 March 2005.