By Ruediger Stein
This examine of natural carbon accumulation in marine environments starts with a evaluate of mechanisms controlling natural carbon deposition, targeting effects from expeditions into Baffin Bay and the Labrador Sea, in addition to the ocean of Japan and the northwest coast of Africa. significant gadgets of the research have been the reconstruction of alterations in palaeoceanic variables and the heritage of palaeoclimates in numerous environments. The members additionally constructed extra basic versions for natural carbon accumulation and in comparison organic-carbon features derived from assorted analytical suggestions with the intention to achieve the best-fitting interpretation version.
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Extra resources for Accumulation of organic carbon in marine sediments: results from the Deep Sea Drilling Project Ocean Drilling Program (DSDP ODP)
O. . . . :. : ! L. - . ~ . l . i°i i°i°! % ! i i°i t. , ..... o.... . . % :i,:~::~:b::::: ..... - . . . . . 0 40 5. 1. Introduction During ODP-Leg 105, holes were drilled at three sites in Baffin Bay and the Labrador Sea (Fig. 27). , 1987). 72" 88" 50" t4° 68" 64 ° 60" 56° ,52" 48" 44" 40* Fig. 27: Location map of Sites 645, 646, and 647. Black arrows indicate surface-water circulation (according to Tchernia, 1982). BIC = Baffin Island Current; LAC = Labrador Current; EGC = East Greenlandcurrent; WGC = West Greenland Current.
J Q) C 0 0 UJ . J w 1.... I C: / 0 I I 0 I I E ~d j J Fig. 37: Total organic carbon content at Site 647. Stippled field marks interval of major occurrence of biogenic opal according to Bohrmann and Stein (1989).
This means, the sediment data of a specific variable canl~ot be taken as a direct measure of its production rate in the surface water. Thus, further information about environmental conditions such as, for example, degree of dissolution, oxygen content in the water body or extent of bioturbation, is necessary (see above). From this it is obvious that different independant tracers should be used for reconstruction of paleoproductivity in order to minimize errors in interpretations. 2. C h a r a c t e r i s t i c s o f oxic a n d a n o x i c e n v i r o n m e n t s Informations about the oxygen content of deep/bottom water masses can be derived from different parameters (Fig.