scor

FacebookTwitter

New revelations on boundary scavenging in the North Pacific

Thorium (Th) and protactinium (Pa) are very efficient tracers of particle dynamics in the ocean. More particularly, their relative distributions inform on the intensity of "scavenging", in other words, the processes that remove dissolved elements from seawater by their precipitation or adsorption on particles. Thanks to 12 new profiles in the North Pacific, Hayes and co-authors observe a much larger relative difference in scavenging intensity between the Subtropical gyre and Subarctic Pacific gyre than within each of these regions. This effect is greater for Pa than for Th, likely reflecting the fact that biogenic silica, a phase produced by diatoms which has a strong affinity for Pa, is much more prevalent in the North. While highlighting the role of biogeography, the study also finds that in the deep ocean, manganese oxides, an inorganic phase, may play an additional role in Pa scavenging.

13 Hayes lFigure: Simplified figure showing scavenging intensity in the Pacific Ocean.
Please click here to view the figure larger.

Reference:

Hayes, C. T., Anderson, R. F., Jaccard, S. L., François, R., Fleisher, M. Q., Soon, M., & Gersonde, R. (2013). A new perspective on boundary scavenging in the North Pacific Ocean. Earth and Planetary Science Letters, 369-370, 86–97. doi:10.1016/j.epsl.2013.03.008. Click here to access the paper.

Isotopes Atlantic Ocean Iron Global scale Pacific Ocean Neodymium Neodymium isotopes Particles Multiple TEIs Southern Ocean Zinc Thorium Land-ocean inputs Hydrothermal Arctic Ocean Analysis Modelling Circulation Cadmium Land-ocean input Thorium isotopes Data compilation Indian Ocean Cycles Mercury Radium Speciation Barium Silicon Aerosol input Iron isotopes Copper Manganese Hypoxia Radium isotopes Phosphate Cobalt Rare Earth Element Lead Lead isotopes Aluminium Protocol Mediterranean Sea Aerosols Boundary Exchange Protactinium Thorium-Protactinium Paleoceanography Environmental change Organic matter Nepheloids Aerosol Cadmium isotopes Zinc isotopes International Polar Year Uranium Microbial Rare Earth Elements Benthic Limitation Phytoplankton Oxygen Silicon isotopes Chromium Chronium isotopes BioGEOSCAPES Particulate Organic Carbon Export fluxes Residence times Methylmercury Surface waters Helium Paleocirculation Proxy Nickel Remineralization Nitrogen Sediments Climate change Lanthanum Yttrium Scandium Intercalibration Lithogenic Macronutriments Micronutriments Hafnium Hafnium isotopes Ice Sea ice Helium isotopes Particle fluxes Barium isotopes Biological pump Iodine Uranium isotopes Artificial Intelligence Cadmium sulfide Antarctic geology Beryllium Mammals Phosporus Time Series Productivity Red Sea Distribution coefficient Mesoscale transport Fertilisation Processes Estuaries Mesopelagic Anoxia Black Sea ICPMS Ecosystem CO2 degassing Transmissiometer Eddy Kinetic Energy Fate Scavenging Fractionation Distribution Iron sulfide Precipitation Shelf Inputs River Pitzer equations Gadolinium Intercomparison Coastal area Gallium Submarine Ground Water Discharge Cooper isotopes Total Hg Fertilization Experiments Behavior Budget Atmospheric Dynamic SAFE samples Boundary Scavenging Procedure Osmium Arsenic Aerosols input Nitrate Nutrients Deep water Copper isotopes Dissolved concentations

 Data Product (IDP2017)

eGEOTRACES Atlas

 Data Assembly Centre (GDAC)

 Outreach

Subscribe Mailing list

Contact us

To get a username and password, please contact the GEOTRACES IPO.

This site uses cookies to offer you a better browsing experience. Find out more on how we use cookies and how you can change your settings.