Titlebook: Use of Proxies in Paleoceanography; Examples from the So Gerhard Fischer,Gerold Wefer Book 1999 Springer-Verlag Berlin Heidelberg 1999 Atla

EWER

Organic Carbon and Carbonate as Paleoproductivity Proxies: Examples from High and Low Productivity Acomponents as paleoproductivity proxies are exemplified by comparison of two sediment cores: one from the high productivity upwelling region off Angola, and the other from the low productivity area off North Brazil. Unlike the upwelling site, sedimentary organic carbon in the low productivity area i

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尊严

Variability in Export Production Documented by Downward Fluxes and Species Composition of Marine Plaand downward flux of diatom assemblages was determined from time-series sediment traps off Cape Blanc in the Mauretanian upwelling zone; south of Cape Verde Island within the Guinea Dome; along a N-S transect in the high productivity belt of the eastern equatorial Atlantic in the Guinea Basin; in th

嘴唇可修剪

Reliability of the 231Pa /230Th Activity Ratio as a Tracer for Bioproductivity of the Oceanvity ratio of recent sediments. This observation forms the basis for using the ..Pa/..Th ratio as a proxy for past changes in export productivity. However, a simple relationship between ..Pa/..Th ratio and particle flux requires that the water residence time in an ocean basin is far in excess of the

Compassionate

Sediment Redistribution, 230Thex- Normalization and Implications for the Reconstruction of Particle ments, besides other factors, greatly depends on the quantification of the amount of laterally redistributed sediment particles. This is particularly crucial in areas of highly dynamic bottom currents such as in the vicinity of the Antarctic Circumpolar Current System of the Southern Ocean but may a

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Book 1999cles of biochemical components in the ocean. These prox­ ies are measurable descriptors for desired but unobservable environmental variables such as tempera­ ture, salinity, primary productivity, nutrient content, or surface-water carbon dioxide concentrations. The proxies are employed in a manner a

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