Oguz T., S.Besiktepe, O.Basturk, I.Salihoglu, D.Aubrey, A.Balci, E.Demirov, V.Diaconu, L.Dorogan, M.Duman, L.Ivanov, S.Konovalov, A.Stayanov, S.Tugrul, V.Vladimirov, A.Yilmaz.
CoMSBlack'92a Physical and Chemical Intercalibration Workshop. Erdemli, Turkey, 15-29 January 1993. Intergovernmental Oceanographic Commission, Workshop Report. UNESCO, Paris. No.98, 86pp.

Abstract

An Intercalibration Workshop for physical and chemical data was held at the Institute of Marine Sciences (IMS) of the Middle East Technical University, Erdemli, Turkey, from 15-29 January 1993, for physical and chemical data acquired during CoMSBlack '92a. This intercalibration exercise was a follow-up to an intercalibration exercise for CoMSBlack '92a biological data held at this same site during December, 1992.

CoMSBlack '92a acquired complete hydrographic, biological, and chemical data set for the entire Black Sea with the participation of all Black Sea riparian countries (except Georgia) as well as the U.S. Nearly 400 hydrographic stations were occupied to the nominal water depth of 500 dbar; biological and chemical measurements were made at 100 of these stations. This quasi-synoptic survey was accomplished using five ships during an interval of approximately three weeks. The cruise coverage was essentially the same as for the companion cruise, HydroBlack '91 of September 1991.

Results show good agreement between CTD's from the different regions (an improvement over HydroBlack '91), and the intercalibrated results show a consistent and high resolution detail of the dynamic topography and other physical characteristics of the entire Black Sea basin. The intercalibrated data set is now available within each country and from WHOI, and contributes to the basis for studies on ocean physics as well as interdisciplinary issues such as oxygen depletion within the basin and hydrogen sulfide distribution. This effort provides an intercalibrated, spatially-dense baseline against which all future and past measurements can be compared, contributing to results from HydroBlack '91.

The chemical data showed considerably more disparity, because of sensitivity of results to sampling methods and equipment, analytical techniques, and various sources of contamination. In addition, some ships were not able to measure all parameters for a variety of reasons, and some chemical fields are therefore incomplete. However, the data show a considerable improvement over those from HydroBlack '91, and provide some exciting data for future papers.

The Workshop resulted in exchange of all data, plans for a detailed, ship-board intercalibration cruise for sampling and analysis comparisons for biogeochemical purposes, and detailed outlines of scientific articles to be prepared during the following six months, to be submitted to scientific journals.

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