Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

OXYGEN Mediterranean

For marble provenance studies, the most successful technique seems to be the measurement, through mass spectrometry, of the abundance ratios of the stable isotopes of carbon and oxygen (116). However, no single technique appears to provide unequivocal results, especially in cases such as the different Mediterranean sources, and a combination is often necessary to arrive at an approximate place of origin (117). [Pg.423]

To determine whether his Pacific samples were in fact representative of other oceans, Patterson and a Japanese colleague, Mitsunobu Tat-sumoto, began developing profiles of the lead in ocean layers in Atlantic and Mediterranean waters. Patterson hated ocean-going field trips he often became violently seasick, once so seriously that he had to be given oxygen. Because the ships were coated with leaded paints and compounds, sampling was tricky, too. Despite the problems, Patterson could see that, as in the Pacific, lead was concentrated in the upper portions of the Atlantic and Mediterranean. [Pg.175]

Fig. 2 Development of anoxic conditions in the Black Sea water column over time, based on modeling results. Solid and dashed lines represent vertical profiles of dissolved oxygen and hydrogen sulfide, respectively. Numbers are x 1000 years since the first appearance of the Mediterranean waters in the Black Sea. Filled circles and horizontal bars represent the average and the range of the observed concentrations in the present Black Sea,... Fig. 2 Development of anoxic conditions in the Black Sea water column over time, based on modeling results. Solid and dashed lines represent vertical profiles of dissolved oxygen and hydrogen sulfide, respectively. Numbers are x 1000 years since the first appearance of the Mediterranean waters in the Black Sea. Filled circles and horizontal bars represent the average and the range of the observed concentrations in the present Black Sea,...
The sulfur budget for the Black Sea has been considered in several papers [23, 24,74-77]. Sulfide sources are sulfide production in sediments, sulfide flux at the sediment/water interface, and sulfide production in the water column. Sulfide sinks are sulfide oxidation at the oxic/anoxic interface and in the basin interior by dissolved oxygen of the modified Mediterranean water and iron sulfide formation in the water column. [Pg.323]

Loss rates of both CCI4 and Fll in anoxic waters are probably due to biological rather than chemical removal (Lee et al., 1999). It also seems likely that some of the chlorofluorocarbons are removed in fully oxygenated surface waters. Observations show that there is a deficit of CCI4 in the Antarctic surface and bottom waters (Meredith et al., 1996). Finally, fluorinated compounds such as CFC-113 are degraded in warm surface waters of the temperate North Atlantic, the tropical western Pacific, the Eastern Mediterranean, and even the Weddell Sea (Roether et al., 2001). CFC-113 depletions were —3% yr, with possibly accelerated rates in the mixed layer or near the surface. [Pg.2928]

Fihppelh G. M., Sierro F. J., Flores J. A., Vazquez A., Utriha R., Perez-Folgado M., and Latimer J. C. (2003) A sediment-nutrient-oxygen feedback responsible for productivity variations in Late Miocene sapropel sequences of the western Mediterranean. Palaeogeogr. Palaeoclimatol Palaeoecol. 190, 335-348. [Pg.3615]

Vengosh A., Spivack A. J., Artzi Y., and Ayalon A. (1999) Boron, strontium, and oxygen isotopic and geochemical constraints for the origin of salinity in groundwater from the Mediterranean coast of Israel. Water Resour. Res. 35, 1877-1894. [Pg.4904]

At middle and southern European latitudes, farther from the immediate impact of glacier advances and retreats, well-dated isotope records from speleothems from widely spaced caves allow comparison of regional climate shifts. McDermott et al. (1999) found, for example that early Holocene warm conditions prevailed on the Atlantic seaboard (southern Ireland) while relatively cool conditions occurred in the Mediterranean region of southern France. At 3500 years these conditions were shown to reverse. In the eastern Mediterranean, oxygen and carbon isotope ratios have been used to determine wet and dry periods (Frumkin et al., 1994 Frumkin et al., 1999a, b Bar-Matthews et al., 1996). The wetter climate of the Holocene is recorded in the speleothems. [Pg.157]

Bar-Matthews, M., Ayalon, A., Matthews, A., Sass, E. and Halicz, L., 1996, Carbon and oxygen isotope study of the active water-carbonate system in a karstic Mediterranean cave Implications for paleoclimate research in semiarid regions, Geochim. Cosmochim. Acta 60 337-347. [Pg.170]

Bar-Matthews, M., Ayalon, A., Gilmour, M., Matthews, A. Hawkesworth, C.J. (2003) Sea-land oxygen isotopic relationships from planktonic foraminifera and speleothems in the Eastern Mediterranean region and their implication for paleo-rainfall during interglacial intervals. Geochimica et Cosmochimica Acta 67, 3181-3199. [Pg.235]


See other pages where OXYGEN Mediterranean is mentioned: [Pg.24]    [Pg.29]    [Pg.73]    [Pg.85]    [Pg.86]    [Pg.87]    [Pg.90]    [Pg.451]    [Pg.33]    [Pg.340]    [Pg.352]    [Pg.303]    [Pg.801]    [Pg.24]    [Pg.315]    [Pg.230]    [Pg.152]    [Pg.525]    [Pg.243]    [Pg.149]    [Pg.69]    [Pg.311]    [Pg.326]    [Pg.262]    [Pg.150]    [Pg.685]    [Pg.698]    [Pg.1328]    [Pg.1492]    [Pg.4404]    [Pg.4898]    [Pg.21]    [Pg.335]    [Pg.1171]    [Pg.191]    [Pg.172]    [Pg.287]    [Pg.10]   
See also in sourсe #XX -- [ Pg.225 , Pg.226 , Pg.276 ]




SEARCH



Mediterranean

© 2024 chempedia.info