SCOR WG 116
Sediment Trap and 234Th Methods for Carbon Export Flux Determination
Chair: Ken Buesseler (USA)
Other Full Members:
Avan N. Antia (Germany), Scott Fowler (Monaco), Orjan Gustafsson (Sweden), Koh Harada (Japan), Chen Min (China-Beijing), M.M. Sarin (India), Deborah K. Steinberg (USA), Tom Trull (Australia), and Michiel Rutgers van der Loeff (Germany)
Associate Members: Anthony F. Michaels (USA)
Terms of Reference
- To explain the terms "export production" and "new production" and their inter-relation. How does the carbon flux determined using traps and 234Th relate to export production?
- To review the current status of carbon export flux determination using moored and floating sediment traps, their advantages and problems, associated uncertainties and their magnitudes.
- To suggest suitable trap designs and necessary protocols to get reliable flux data.
- To review the basis of 234Th based carbon export flux measurements, models, assumptions and parameters used in the calculations.
- To assess the reliability of these assumptions/parameters, the sources and magnitudes of associated uncertainties. (For example: How do the time scales of sampling, temporal variability in 234Th fluxes, POC/234Th ratio in different particulate pools affect the flux data?).
- To intercompare the carbon export fluxes determined by trap and 234Th methods. If they differ, what are the main causes of discrepancy and how can they be resolved?
- To suggest experimental design and protocols to be followed to obtain quantitative and reliable carbon export fluxes based on the above methods. Can 234Th serve as a global survey tool to determine carbon export fluxes?
- To prepare an interim report within 2 years and a final report in 2 years.
Financial Sponsors: U.S. National Science Foundation, SCOR
#1: 8-9 July 2001 in Amsterdam, The Netherlands
#2: 3-7 November 2003 on Catalina Island, California, USA
#3: 19-21 August 2004 in Woods Hole, Massachusetts, USA
#4: 18-21 April 2005 in Xiamen, China
Product: Buesseler et al. 2007. An assessment of the use of sediment traps for estimating upper ocean particle fluxes. Journal of Marine Research, 65, 345–416 - Used with permission from the Journal of Marine Research (http://peabody.yale.edu/scientific-publications/journal-marine-research/home)
Website for Activity: http://usjgofs.whoi.edu/mzweb/scorwg116/index.htm