New Seafloor Carbonate Synthesis Product | POGO

New Seafloor Carbonate Synthesis Product

To interface with whole-earth scale models, such as climate and circulation models, ocean substrates data have been gridded from dbSEABED at the global scale. The grid resolution is low (0.1 degrees), as for most of the models. Leads of this mapping project are seeking collaborations with chemical oceanographers.   

The carbonate synthesis follows early work by Archer (1996, "An atlas of the distribution of calcium carbonate in sediments of the deep sea." Global Biogeochemical Cycles 10, 159-174), but with a number of changes: 

1) The amount of data available is much greater, now millions of samples and sites.

2) The core-top criterion is relaxed (based on arguments involving bioturbation, erosion, management of core over-penetrations in underlying database). More sampling types are included: grabs and dredges, scuba and submersible dives.

3) Exposed rock areas (such as the spreading ridges) and Fe-Mn nodule grounds are accounted for. 

4) Shallow-water areas, which also play a role in ocean carbonate chemistry (Andersson & Mackenzie, 2012.  "Revisiting four scientific debates in ocean acidification research", Biogeosciences. 9, 893-905) are mapped. Prime amongst the shallow water areas is the "Coral Triangle" area of SE-Asia, Indonesia. 

The mapping suggests lower carbonate contents overall than mapped in earlier works. This may affect modeled budgets for earth-system carbon dioxide and outcomes for ocean acidification. Some geographic data on the regional distributions of skeletal carbonate types and mineralogies are also available from the project.

The dbSEABED data are rapidly being extended and new griddings are generated on request. For more information and to view the product, please visit:

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