Renewal time and transport of unventilated Central Intermediate Water of the Weddell Sea derived from biogeochemical properties
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ID: 308738
2002
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Abstract
We have investigated the intermediate water mass of the central Weddell Gyre using TCO 2 and oxygen data of FS Polarstern cruises in 1992, 1996 and 1998.This water mass, designated as Central Intermediate Water (CIW), is enriched in CO 2 and depleted in O 2 relative to its source water due to biological degradation.CO 2 enrichment and O 2 depletion were quanti ed by calculating the difference between the concentrations in the CIW and those in the more southern source water, the Circumpolar Deep Water, which derives from the Antarctic Circumpolar Current.Inventories of enrichment and depletion were determined over the whole depth range of CIW, i.e. about 200-800 m.The O 2 depletion inventory was greater than that of TCO 2 enrichment which is in line with a biological origin of the signal.Spatial and interannual variation appeared to be small.Because subsurface remineralization in the central Weddell Gyre is largely restricted to the CIW, the export production estimate from previous work has been applied to compute the renewal time of CIW from these inventories.A renewal time of only three years was found.TCO 2 -and O 2 -based computations were consistent, the former showing larger variation, though.From renewal time and volume of the CIW, a transport velocity (renewal rate) of 6 -7 Sv was obtained.Of this, about 1 Sv is upwelled into the surface layer.The remaining 5-6 Sv CIW must be exported to the north, which is opposite to previous views.Results of water mass age and transport rate have thus been obtained using a method based on biogeochemical parameters.As the CIW cannot be identi ed by temperature and salinity, nor with transient tracers because it is hardly ventilated, this is the only way to obtain such results.As part of the CIW export, a large amount of remineralized CO 2 enters the abyssal oceans where it is sequestered for long periods of time.The CIW is a principal and highly ef cient player in the biological pump mechanism of the Southern Ocean.
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openalex_W2119887378
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| Authors | Mario Hoppema, H. J. W. de Baar, Eberhard Fahrbach, Richard G. J. Bellerby |
| Journal | journal of marine research |
| Year | 2002 |
| DOI |
10.1357/002224002762688696
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| URL | |
| Keywords | Keywords not found |
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