What did we learn about ocean particle dynamics in the GEOSECS–JGOFS era?
Rutgers van der Loeff, Michiel M.
Lam, Phoebe J.
Sherrell, Robert M.
German, Christopher R.
MetadataShow full item record
KeywordHistorical review; Oceanic Particle distribution sources and sinks; GEOSECS; JGOFS; GEOTRACES
Particles determine the residence time of many dissolved elements in seawater. Although a substantial number of field studies were conducted in the framework of major oceanographic programs as GEOSECS and JGOFS, knowledge about particle dynamics is still scarce. Moreover, the particulate trace metal behavior remains largely unknown. The GEOSECS sampling strategy during the 1970’s focused on large sections across oceanic basins, where particles were collected by membrane filtration after Niskin bottle sampling, biasing the sampling towards the small particle pool. Late in this period, the first in situ pumps allowing large volume sampling were also developed. During the 1990’s, JGOFS focused on the quantification of the “exported carbon flux” and its seasonal variability in representative biogeochemical provinces of the ocean, mostly using sediment trap deployments. Although scarce and discrete in time and space, these pioneering studies allowed an understanding of the basic fate of marine particles. This understanding improved considerably, especially when the analysis of oceanic tracers such as natural radionuclides allowed the first quantification of processes such as dissolved-particle exchange and particle settling velocities. Because the GEOTRACES program emphasizes the importance of collecting, characterizing and 39 analyzing marine particles, this paper reflects our present understanding of the sources, fate and sinks of oceanic particles at the early stages of the program.
Author Posting. © The Author(s), 2014. This is the author's version of the work. It is posted here by permission of Elsevier for personal use, not for redistribution. The definitive version was published in Progress in Oceanography 133 (2015):6-16, doi:10.1016/j.pocean.2014.12.018.
Showing items related by title, author, creator and subject.
What can paired measurements of Th isotope activity and particle concentration tell us about particle cycling in the ocean? Marchal, Olivier; Lam, Phoebe J. (2012-04-17)The ability of paired measurements of thorium isotope activity and particle concentration to constrain rate constants of sorption reactions and particle dynamics in the ocean is examined. This study is motivated by GEOTRACES ...
Green, Rebecca E. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2002-06)Predictions of chlorophyll concentration from satellite ocean color are an indicator of phytoplankton primary productivity, with implications for foodweb structure, fisheries, and the global carbon cycle. Current models ...
Hayes, Christopher T.; Anderson, Robert F.; Fleisher, Martin Q.; Vivancos, Sebastian M.; Lam, Phoebe J.; Ohnemus, Daniel C.; Huang, Kuo-Fang; Robinson, Laura F.; Lu, Yanbin; Cheng, Hai; Edwards, R. Lawrence; Moran, S. Bradley (2015-01)The natural radionuclides 231Pa and 230Th are incorporated into the marine sediment record by scavenging, or adsorption to various particle types, via chemical reactions that are not fully understood. Because these ...