The South Atlantic in the Late Quaternary: Reconstruction of by R. Schlitzer, R. Usbeck, G. Fischer (auth.), Professor Dr.

By R. Schlitzer, R. Usbeck, G. Fischer (auth.), Professor Dr. Gerold Wefer, Dr. Stefan Mulitza, Dr. Volker Ratmeyer (eds.)

The South Atlantic performs a serious function within the couplingofoceanic tactics among the Antarctic and the decrease latitudes. The Antarctic Ocean, besides the adjoining southern seas, is of considerable significance for worldwide weather and for the distributionofwater plenty simply because itprovides huge areas ofthe international ocean with intermediate and backside waters. not like the North Atlantic, the Southern Ocean acts extra as an "information distributor", in place of an amplifier. simply because the North Atlantic is influencedby the South Atlantic during the contributionofwarm floor water,the incomingsupply ofNADW - within the region of the Southern Ocean as Circumantarctic Deep Water - affects the oceanography ofthe Antarctic. The competing affects from the northern and southern oceans at the present and mass funds structures might be most sensible studied within the South Atlantic. not just do adjustments within the present platforms within the jap Atlantic high-production areas impact the strength price range, additionally they impression the nutrient inventories, and for this reason impression the whole productiveness ofthe ocean. moreover, the huge zone of the polar entrance is a severe region with admire to productivity-related circulate because it is the resource of Antarctic Intermediate Water. even though theAntarctic Intermediate Watertoday liesdeeper than the water that rises within the upwelling areas, it's the long term resource ofnutrients which are finally liable for the availability oforganic topic to the ocean flooring and to sediments.

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Extra resources for The South Atlantic in the Late Quaternary: Reconstruction of Material Budgets and Current Systems

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These differences in the C org :ballast ratios (='transport ratios', cf. , 2002) may be due to a difference in the relative proportions ofballast minerals as hypothesized by Armstrong et al . (2002). Particle fluxes of all components in the western part of the tropical Atlantic clearly decreased from north to south, following the general decrease in primary production from the mesotrophic equatorial site (WAOO) to the oli gotrophic site in the northernmost gyre of the Brazil Ba sin (WA l l "S; Table 1; see Fischer et al.

At both latter sites, Fischer et al. (2002) obtained relative standard deviations rising up to 94% (site PF) and even 120% (site BO) using an extended data set. Both locations are characterized by a high degree of seasonality ('strongly seasonal to pulsed production systems' , Berger and Wefer 1990) as described in Fischer et al. (2002). However, primary production values according to Antoine et al. (1996) are rather low at both sites (40-65 gC nr 2 yr") , although probably underestimated by a factor of two or more (Schlitzer 2002).

1, close to the value found by Antia et al. (2001) applying to the deep Atlantic (::::: 1 at 2000 m). As discussed above, the relationship between opal/BSi and organic carbon fluxes varies with the region, and no clear picture emerges when lithogenic versus organic carbon fluxes are plotted. A plot of total ballast versus organic carbon seems to indicate a linear increase in the lower range of ballast and organic carbon fluxes (insert in Fig. 48,N=61). In the higher range, the scattering of data points is very large.

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