scor

FacebookTwitter

High particulate organic carbon export in the Arabian Sea

In the framework of Indian GEOTRACES cruise GI02, high-resolution sampling was carried out in the Arabian Sea and the Indian Ocean during April–May 2014. The first 234Th-based carbon export flux ever made in the southern Arabian Sea are presented. In contrast to episodic decrease of primary production from 17°N to 16°S, POC export fluxes show high values  (up to 9 mmol m-2 d-1), definitely larger than what was observed in the Bengal Bay at the same season. 234Th deficit in subsurface depths is due to the diel vertical migration, grazing, and fecal pellet production by mesozooplankton. Interestingly, the modelled POC export fluxes from in situ and satellite-derived primary production are higher than the field values (234Th-Based) for two models and are comparable for a third one, discrepancies discussed in the paper.

18 Subha 2Figures: (A) Depth-latitude vertical profile of oxygen saturation (%) (white contour lines) is shown relative to 234Th/238U activity ratio (A.R.) along the 65°E meridional section of the Arabian Sea and the Indian Ocean. (B) Plot showing relation between primary production and POC export flux. The POC export flux sinking out of the euphotic zone was derived by Laws, Dunne and Henson’s models. Dashed trend lines represent export efficiencies of 2, 5, 10 and 20%. Click here to view the figure larger.

Reference:

Subha Anand, S., Rengarajan, R., & Sarma, V. V. S. S. (2018). Th-234 Based Carbon Export Flux along the Indian GEOTRACES GI02 Section in the Arabian Sea and the Indian Ocean. Global Biogeochemical Cycles, 32(3), 417–436. http://doi.org/10.1002/2017GB005847

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.