globalchange  > 气候减缓与适应
DOI: 10.1038/NGEO3042
论文题名:
Biological and physical influences on marine snowfall at the equator
作者: Kiko R.; Biastoch A.; Brandt P.; Cravatte S.; Hauss H.; Hummels R.; Kriest I.; Marin F.; McDonnell A.M.P.; Oschlies A.; Picheral M.; Schwarzkopf F.U.; Thurnherr A.M.; Stemmann L.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期:11
起始页码: 852
结束页码: 858
语种: 英语
Scopus关键词: Acoustic Doppler Current Profiler ; biogeochemistry ; carbon flux ; equatorial dynamics ; fecal pellet ; imaging method ; nekton ; oceanic current ; particle size ; primary production ; size distribution ; snow ; zooplankton ; Atlantic Ocean ; Pacific Ocean
英文摘要: 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 highresolution 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° S-1° 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° N and 2° S. We thus suggest that zooplankton movements and ocean currents modulate the transfer of particulate carbon from the surface to the deep ocean. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105678
Appears in Collections:气候减缓与适应
科学计划与规划

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作者单位: GEOMAR Helmholtz Centre for Ocean Research Kiel, Düsternbrooker Weg 20, Kiel, Germany; Faculty of Mathematics and Natural Sciences, University of Kiel, Kiel, Germany; LEGOS, University of Toulouse, IRD, CNES, CNRS, UPS, Toulouse, France; University of Alaska Fairbanks, College of Fisheries and Ocean Sciences, Fairbanks, AK, United States; CNRS, UMR 7093, Laboratoire D'Océanographie de Villefranche-sur-Mer (LOV), Observatoire Océanologique, Villefranche-sur-Mer, France; Lamont-Doherty Earth Observatory, Palisades, NY, United States; Sorbonne Universités, UPMC Univ Paris 06, UMR 7093, LOV, Observatoire Océanologique, Villefranche-sur-Mer, France

Recommended Citation:
Kiko R.,Biastoch A.,Brandt P.,et al. Biological and physical influences on marine snowfall at the equator[J]. Nature Geoscience,2017-01-01,10(11)
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