Evaluation of Resuspended Sediments to Sinking Particles by Benthic Disturbance in the Clarion-Clipperton Nodule Fields

Kim, Hyung Jeek; Kim, Dong-Seon; Hyeong, Kiseong; Hwang, Jeomshik; Yoo, Changsik; Ham, Dong Jin; Seo, Inah

doi:10.1080/1064119x.2013.815675

Cited by 8 publications

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“…Because the POC content of surface sediments is typically several‐fold smaller than that of sinking particulate matter, overall contributions of resuspended sediment to sinking particulate load must be much higher than these estimates [ Kim et al ., ]. The CaCO 3 flux showed a positive correlation with Al flux at 3000 m, implying that benthic sources of CaCO 3 were most prominent at this depth (Figure ).…”

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confidence: 99%

Biological and physical controls on the flux and characteristics of sinking particles on the Northwest Atlantic margin

et al. 2017

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s Biogenic matter characteristics and radiocarbon contents of organic carbon (OC) were examined on sinking particle samples intercepted at three nominal depths of 1000 m, 2000 m, and 3000 m (∼50 m above the seafloor) during a 3 year sediment trap program on the New England slope in the Northwest Atlantic. We have sought to characterize the sources of sinking particles in the context of vertical export of biogenic particles from the overlying water column and lateral supply of resuspended sediment particles from adjacent margin sediments. High aluminum (Al) abundances and low OC radiocarbon contents indicated contributions from resuspended sediment which was greatest at 3000 m but also significant at shallower depths. The benthic source (i.e., laterally supplied resuspended sediment) of opal appears negligible based on the absence of a correlation with Al fluxes. In comparison, CaCO3 fluxes at 3000 m showed a positive correlation with Al fluxes. Benthic sources accounted for 42 ∼ 63% of the sinking particle flux based on radiocarbon mass balance and the relationship between Al flux and CaCO3 flux. Episodic pulses of Al at 3000 m were significantly correlated with the near‐bottom current at a nearby hydrographic mooring site, implying the importance of current variability in lateral particle transport. However, Al fluxes at 1000 m and 2000 m were coherent but differed from those at 3000 m, implying more than one mode of lateral supply of particles in the water column.

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Biological and physical controls on the flux and characteristics of sinking particles on the Northwest Atlantic margin

et al. 2017

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“…Particle fluxes do not show any correlation with the measured current speed (not shown). Moreover, POC and CaCO 3 contents in the surface sediments (0–1 cm horizon) at and around Station KOMO were only 0.7% and 0.12%, respectively (Kim et al, ). Therefore, the influence of resuspended sediment on POC and PIC fluxes is likely to be minimal.…”

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confidence: 99%

Suppressed CO₂ Outgassing by an Enhanced Biological Pump in the Eastern Tropical Pacific

Kim

Hyeong

et al. 2019

JGR Oceans

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The Eastern Tropical Pacific (ETP) is the largest oceanic source of carbon dioxide (CO 2 ) to the atmosphere. Sinking particle fluxes at a depth of 4,950 m (50 m above the seafloor) in the ETP were monitored from 2003 to 2013, during which the Pacific decadal oscillation (PDO) shifted from a positive to negative phase. We show a disproportionate increase in the efficiency of the biological pump in this region relative to the increase in primary production that occurred during La Niña years following the shift of the PDO in 2008. Biogenic carbon export from the surface mixed layer was estimated from the observed particulate organic carbon and inorganic carbon fluxes at a depth of 4,950 m and from empirical equations of the vertical attenuation of carbon flux. Enhanced biological carbon export accounted for 2.3-5.5 mol C m -2 year -1 during the La Niña events. Despite a large uncertainty associated with these estimates, we propose that CO 2 outgassing was largely suppressed by an enhanced biological pump during the La Niña events in the negative PDO phase. Plain Language SummaryWe examined the composition and flux of particles sinking to the deep Eastern Tropical Pacific from 2003 to 2013. This region is known as the largest oceanic source of CO 2 to the atmosphere. We observed that the flux of particulate organic and inorganic carbon to a depth of 4,950 m increased as the climate variability called the "Pacific decadal oscillation" shifted from a positive to negative phase (i.e., more La Niña events) in 2008. The biological pump efficiency (i.e., how efficiently biological production of organic matter is transported to the deep ocean) also increased during La Niña years. To investigate how biological production affects the CO 2 exchange with the atmosphere, we estimated the export of carbon from the surface layer based on our flux data at 4,950 m and the current understanding of carbon flux attenuation with depth. CO 2 outgassing was largely suppressed by an enhanced biological pump during the La Niña events in the negative PDO phase.

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Potential Influence of Ocean Acidification on Deep-Sea Fe–Mn Nodules: Results from Leaching Experiments

et al. 2017

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Evaluation of Resuspended Sediments to Sinking Particles by Benthic Disturbance in the Clarion-Clipperton Nodule Fields

Cited by 8 publications

References 22 publications

Biological and physical controls on the flux and characteristics of sinking particles on the Northwest Atlantic margin

Biological and physical controls on the flux and characteristics of sinking particles on the Northwest Atlantic margin

Suppressed CO₂ Outgassing by an Enhanced Biological Pump in the Eastern Tropical Pacific

Potential Influence of Ocean Acidification on Deep-Sea Fe–Mn Nodules: Results from Leaching Experiments

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Evaluation of Resuspended Sediments to Sinking Particles by Benthic Disturbance in the Clarion-Clipperton Nodule Fields

Cited by 8 publications

References 22 publications

Biological and physical controls on the flux and characteristics of sinking particles on the Northwest Atlantic margin

Biological and physical controls on the flux and characteristics of sinking particles on the Northwest Atlantic margin

Suppressed CO2 Outgassing by an Enhanced Biological Pump in the Eastern Tropical Pacific

Potential Influence of Ocean Acidification on Deep-Sea Fe–Mn Nodules: Results from Leaching Experiments

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Suppressed CO₂ Outgassing by an Enhanced Biological Pump in the Eastern Tropical Pacific