Faculty Publications
ORCID iD
0000-0002-1004-5048
Document Type
Article
Abstract
[1] Simple mass balance models are applied to a high resolution 234Th profile from the northwest Pacific to examine the magnitude, rate, and depth distribution of particle remineralization processes below the euphotic zone (Ez). Here, excess 234Th (234Th > 238U) below the Ez is attributed to fragmentation processes that result in the conversion of sinking to non‐sinking particles. By considering particulate organic carbon (POC) to 234Th ratios on particles, we show that POC flux attenuation is larger than for 234Th, which we attribute to bacterial and zooplankton consumption of sinking POC. Three case studies are used to demonstrate how different combinations of particle fragmentation and POC respiration impact flux attenuation below the Ez. When sampled with high vertical resolution and precision, 234Th and POC/234Th ratios provide insights into both export from the Ez and the extent to which sinking particle fluxes and associated minerals are attenuated with depth.
Digital Object Identifier (DOI)
10.1029/2010gl044063
Publication Info
Published in Geophysical Research Letters, Volume 37, Issue 15, 2010.
Copyright 2010 by the American Geophysical Union.
APA Citation
Maiti, K., Benitez-Nelson, C., & Buesseler, K. (2010). Insights into particle formation and remineralization using the short-lived radionuclide, Thoruim-234. Geophysical Research Letters, 37(15), n/a-n/a. doi: 10.1029/2010gl044063
Rights
Copyright 2010 by the American Geophysical Union.