Phosphorus speciation in the sediment and mass balance for the central region of the Great Barrier Reef continental shelf (Australia)

Details Phosphorus speciation in the sediment and mass balance for the central region of the Great Barrier Reef continental shelf (Australia) Phosphorus speciation in the sediment and mass balance for the central region of the Great Barrier Reef continental shelf (Australia)

Jun 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007gecoa..71.2762m&link_type=abstract

Geochimica et Cosmochimica Acta, Volume 71, Issue 11, p. 2762-2779.

Physics

4

Scientific paper

Solid phase P speciation has been determined in sediments from a transect across the central section of the continental shelf and slope of the Great Barrier Reef (GBR) lagoon. This region is characterized by a gradient of riverine aluminosilicate clay and silt nearshore, seawards of which biogenic carbonate sediment predominates. Phosphorus speciation results show large variations along this transect. Organic P and authigenic (apatite) P are the major chemical forms of phosphorus in the central GBR continental shelf sediments. Post-depositional reorganization of P was also observed, converting organic P and iron bound P (Fe P) to authigenic (apatite) P. Phosphorus burial rate was estimated from measurements of total P concentration and excess 210Pb sediment mass accumulation rates. Burial efficiency varies significantly over the shelf. Inshore areas showed significant P remobilization from sediments to the water column (up to ˜50%). The mid and the outer shelf showed little evidence for remobilization (except for coral reef platform sediments), with more of the sediment P being in the less reactive authigenic apatite phases. An appreciable fraction of this non-labile authigenic apatite phase was identified as fish bone. P sources and sinks over the central part of the GBR shelf were quantified using a mass balance approach. This showed that Coral Sea shelf edge upwelling events are essential to satisfy the large P nutrient demand of the whole GBR lagoon. P inputs due to upwelling events were greater than those contributed by local rivers over an average year.

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