期刊
NATURE GEOSCIENCE
卷 10, 期 11, 页码 852-+出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NGEO3042
关键词
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资金
- German Science Foundation through the Collaborative Research Center [754]
- German Federal Ministry of Education and Research
- UVP5 operations
- Agnes b. and Etienne Bourgois
- Veolia Environment Foundation
- Region Bretagne
- Lorient Agglomeration
- World Courier
- Illumina
- EDF Foundation
- FRB
- Prince Albert II de Monaco Foundation
- Chair VISION of the CNRS
- UPMC
- National Science Foundation
- US Global Ocean Carbon and Repeat Hydrography Program
- University of Alaska Fairbanks
- US GO_SHIP [NSF OCE-1437015]
- French national programme LEFE/INSU (ZEBRE)
- IRD
- Fund for Scientific Research-Flanders, Rega Institute, KU Leuven, The French Ministry of Research and the French Government 'Investissements d'Avenir' programmes OCEANOMICS [ANR-11-BTBR-0008]
- Directorate For Geosciences
- Division Of Ocean Sciences [1459835] Funding Source: National Science Foundation
- Directorate For Geosciences
- Division Of Ocean Sciences [1421118] Funding Source: National Science Foundation
High primary productivity in the equatorial Atlantic and Pacific oceans is one of the key features of tropical ocean biogeochemistry and fuels a substantial flux of particulate matter towards the abyssal ocean. How biological processes and equatorial current dynamics shape the particle size distribution and flux, however, is poorly understood. Here we use high-resolution size-resolved particle imaging and Acoustic Doppler Current Profiler data to assess these influences in equatorial oceans. We find an increase in particle abundance and flux at depths of 300 to 600 m at the Atlantic and Pacific equator, a depth range to which zooplankton and nekton migrate vertically in a daily cycle. We attribute this particle maximum to faecal pellet production by these organisms. At depths of 1,000 to 4,000 m, we find that the particulate organic carbon flux is up to three times greater in the equatorial belt (1 degrees S-1 degrees N) than in off-equatorial regions. At 3,000 m, the flux is dominated by small particles less than 0.53 mm in diameter. The dominance of small particles seems to be caused by enhanced active and passive particle export in this region, as well as by the focusing of particles by deep eastward jets found at 2 degrees N and 2 degrees S. We thus suggest that zooplankton movements and ocean currents modulate the transfer of particulate carbon from the surface to the deep ocean.
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