Speciation and burial flux of phosphorus in the surface sediments of the eastern Mediterranean

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2000
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Abstract
The distribution of various forms of P in surface sediments across the Eastern Mediterranean and in Saharan dust and Nile particulates as a potentially important source of sediment to the basin has been determined using the SEDEX procedure (Ruttenberg, 1992). The distribution of most phases could be described by a rather simple mixing between Adriatic sediment and Saharan dust across the Ionian Sea and between Saharan dust and Nile particulates across the Levantine basin. The relative proportions of P between the various phases were similar to that found previously in other marine systems with P ~aut~ \> P ~Fe~ \> P ~det~ \> P ~ex~ . However, P ~org~ in the Eastern Mediterranean was approximately 15 to 20 percent which was lower than that found in many other marine sediments. P ~Fe~ was higher ( approximately 36 percent) in the areas adjacent to the Nile delta than elsewhere across the basin. Saharan dust was a source of P to surface waters. There was, however, no evidence of uptake of phosphate by Saharan dust in Levantine Deep water (LDW). By contrast Nile particulates adsorb phosphate from LDW probably into an Fe-bound phase. The organic C/P ratio in the deep part of the basin was 136 which is typical of low sedimentation rate ocean sediments and indicates that the organic P being buried is likely to be refractory. However on the Israeli shelf, where Nile particulates predominate, the organic C/P was also low ( approximately 164) which is unusual for a sediment with a relatively high sedimentation rate (0.005-0.3 cm/yr). It was suggested that this was due to the unusual nature of the Nile system in which inorganic particulates were jetted out into the basin beyond the plume of increased primary productivity. The burial flux of total P in the Eastern Mediterranean was calculated as 5.5 \* 10 ^12^ mmole P/yr. Previous estimates of the P budget of the eastern basin have used the net flux of P through the straits of Sicily to calculate the terrestrial and atmospheric input to the basin. These estimates, which ignored sediment burial of P, need to be increased by a factor of approximately 2. However 3.0 \* 10 ^12^ mmole P/yr of this input was from the river Nile, which as a result of the completion of the Aswan dam in 1965, no longer supplies sediment to the basin.
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openalex_W2019902010 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors L. M. Eijsink
Journal american journal of science
Year 2000
DOI
10.2475/ajs.300.6.483
URL
https://ajs.scholasticahq.com/article/61344.pdf
Keywords Keywords not found

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