A new method to determine depth-dependent carbon export fluxes using vertical 230Th profiles

Details A new method to determine depth-dependent carbon export fluxes using vertical 230Th profiles A new method to determine depth-dependent carbon export fluxes using vertical 230Th profiles

Mar 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3305609h&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 5, CiteID L05609

Mathematics

Logic

Oceanography: Biological And Chemical: Biogeochemical Cycles, Processes, And Modeling (0412, 0414, 0793, 1615, 4912), Oceanography: Biological And Chemical: Carbon Cycling (0428), Oceanography: Biological And Chemical: Marine Inorganic Chemistry (1050), Oceanography: Biological And Chemical: Radioactivity And Radioisotopes, Oceanography: Biological And Chemical: Sorptive Scavenging

Scientific paper

Because of their particle-reactive properties, radiogenic thorium isotopes in oceanic waters have been used in studies for the particle removal processes. In particular, 234Th has extensively been utilized to determine the carbon export flux from the euphotic zone. On the other hand, 230Th in seawater has so far mainly provided information on residence times, settling velocities and adsorption-desorption rates of 230Th in the water column. Here we introduce a new model to calculate the carbon export flux from vertical 230Th profiles. According to this model, the carbon export flux is directly related to the POC/230Th ratio in sinking or suspended particulate matter. The carbon export flux can be directly calculated from vertical profiles of POC and particulate 230Th, which should become an effective means to constrain ocean biogeochemical models.

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