Semal Yemenicioglu

Seasonal chemical and mineralogical variability of atmospheric particles in the coastal region of the Northeast Mediterranean

Abstract A time-serial analysis of atmospheric particles collected since 1990 at a coastal site bordering the northeastern Mediterranean Sea shows that the collected samples, display seasonal patterns in both concentration and color. The 1990–91 and 1992 collections yield an annualised average of around 0.5 g/day dust loading reducing to around 0.3 g/day when the sea-salt contribution is excluded. The highest concentrations of atmospheric particles of continental origin for both natural (e.g. Fe, Mn) and anthropogenic (e.g. Cd, Pb) materials are observed between April and October and this variability is inversely related to the frequency and the amount of rainfall. Sea-salt aerosol (Na) contents do not follow this pattern but are related to local wind speeds. Trace elements in the dusts also display seasonal variations in enrichment factors (EF), with respect to average elemental abundances in crustal rocks. The non-enriched (crustal) elements appear to be indicators of long-distance supply while the strongly enriched (anthropogenic) and moderately enriched suites of elements represents inputs from local or “anomalous” sources. The similar morphology of quartz and calcite grains and the uniformity of the clay mineral assemblages in samples collected over a two-year period strongly indicate a common source for the bulk of the atmospheric particles. The dominant clay types (palygorskite and smectite) document a desertic source areas.

Airborne material collections and their chemical composition over the Black Sea

Abstract The chemical composition of the Black Sea aerosol was studied during the July 1992 CoMSBLACK 92 cruise on board R V Bilim. It has been shown that the chemical composition of the Black Sea aerosols can change very rapidly in accordance with changes in the wind regime. The influence of the Saharan desert particles can alter the elemental concentrations of trace metals. The result has been summarized on Enrichment Factor diagrams to permit comparison with previous and future studies. The atmospheric input of oxidized nitrogen (NO3+NO2−N) can reach 13% of the total inorganic nitrogen input of the Danube. Lead (Pb) input reaches 39% of this riverine input. Such loads can play an important role in the present state of the sea.

Occurrence and seasonal variation of butyltin species along the mediterranean coast of Turkey

Organotin compounds are extensively used in industrial andagricultural applications, as disinfectants and antifouling additives.The use of TBT as an antifoulant additive in paints increases its le-vel in seawater, especially near marinas and harbours. In general,progressive substitution of organic groups to the tin atom in anyR