Influence of bloom dynamics on Particle Export Efficiency in the North Atlantic: a comparative study of radioanalytical techniques and sediment traps

Ceballos-Romero, Elena; Moigne, Frédéric A.C. Le; Henson, Stephanie A.; Marsay, Chris M.; Sanders, Richard; Garcı́a-Tenorio, R.; Villa-Alfageme, María

doi:10.1016/j.marchem.2016.10.001

Cited by 29 publications

(39 citation statements)

References 95 publications

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“…4). This greater POC export observed when the bloom had already declined may be caused by an ecosystem change, as already described in the Southern Ocean with the emergence of silicified diatoms because of nutrient stress (e.g., Baines et al, 2010;Claquin et al, 2002).…”

Section: Influence Of the Intensity And Stage Of The Bloom On Poc Expmentioning

confidence: 60%

High variability of particulate organic carbon export along the North Atlantic GEOTRACES section GA01 as deduced from <sup>234</sup>Th fluxes

et al. 2018

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Abstract. In this study we report particulate organic carbon (POC) export fluxes for different biogeochemical basins in the North Atlantic as part of the GEOTRACES GA01 expedition (GEOVIDE, May–June 2014). Surface POC export fluxes were deduced by combining export fluxes of total Thorium-234 (234Th) with the ratio of POC to 234Th of sinking particles at the depth of export. Particles were collected in two size classes (>53 and 1–53 µm) using in situ pumps and the large size fraction was considered representative of sinking material. Surface POC export fluxes revealed latitudinal variations between provinces, ranging from 1.4 mmol m−2 d−1 in the Irminger basin, where the bloom was close to its maximum, to 12 mmol m−2 d−1 near the Iberian Margin, where the bloom had already declined. In addition to the state of progress of the bloom, variations of the POC export fluxes were also related to the phytoplankton size and community structure. In line with previous studies, the presence of coccolithophorids and diatoms appeared to enhance the POC export flux, while the dominance of picophytoplankton cells, such as cyanobacteria, resulted in lower fluxes. The ratio of POC export to primary production (PP) strongly varied regionally and was generally low (≤14 %), except at two stations located near the Iberian Margin (35 %) and within the Labrador basin (38 %), which were characterized by unusual low in situ PP. We thus conclude that during the GEOVIDE cruise, the North Atlantic was not as efficient in exporting carbon from the surface, as reported earlier by others. Finally, we also estimated the POC export at 100 m below the surface export depth to investigate the POC transfer efficiencies. This parameter was also highly variable amongst regions, with the highest transfer efficiency at sites where coccolithophorids dominated.

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Section: Influence Of the Intensity And Stage Of The Bloom On Poc Expmentioning

confidence: 60%

High variability of particulate organic carbon export along the North Atlantic GEOTRACES section GA01 as deduced from <sup>234</sup>Th fluxes

et al. 2018

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“…The 210 Po‐ 210 Pb pair is widely used to quantify the POC flux out of the euphotic zone [ Buesseler et al ., ; Verdeny et al ., ; Ceballos‐Romero et al ., ]. This study proved that it could also be used to track the flux of particulate components (such as POC and PON) out of the mesopelagic layer and estimate some crucial parameters (such as residence time) on particulate cycling in mesopelagic water.…”

Section: Discussionmentioning

confidence: 99%

“…The 210 Po‐ 210 Pb pair is also listed as one of the important proxies for investigating the oceanic particle dynamics in the ongoing GEOTRACES program [ Church et al ., ; Rigaud et al ., ]. Since the half‐life of 210 Po enables 210 Po‐ 210 Pb pair to record information on particle cycling over time scales from days to seasons, this pair, together with sediment trap and 234 Th‐ 238 U approach, is used to better decipher the POC export from the euphotic zone on different time scales [ Hong et al ., ; Ceballos‐Romero et al ., ; Maiti et al ., ].…”

Section: Introductionmentioning

confidence: 97%

“…The 210 Po- 210 Pb pair is also listed as one of the important proxies for investigating the oceanic particle dynamics in the ongoing GEOTRACES program [Church et al, 2012;Rigaud et al, 2013Rigaud et al, , 2015. Since the half-life of 210 Po enables 210 Po- 210 Pb pair to record information on particle cycling over time scales from days to seasons, this pair, together with sediment trap and 234 Th-238 U approach, is used to better decipher the POC export from the euphotic zone on different time scales [Hong et al, 2013;Ceballos-Romero et al, 2016;Maiti et al, 2016]. [Kim, 2001], Aleutian Basin [Hu et al, 2014], the South China Sea (SCS) [Chung and Wu, 2005;Wei et al, 2014Wei et al, , 2017, and at a few GEOTRACES stations in Atlantic Ocean [Church et al, 2012;Rigaud et al, 2015].…”

Section: Introductionmentioning

confidence: 99%

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Utilizing ²¹⁰Po deficit to constrain particle dynamics in mesopelagic water, western South China Sea

Yang

Zhang

et al. 2017

Geochem Geophys Geosyst

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The 210Po‐210Pb pair is increasingly used as a proxy of quantifying organic carbon export from the euphotic zone. However, disequilibria between 210Po and 210Pb in mesopelagic water have been poorly studied. Here we present unusual deficiencies of 210Po with respect to 210Pb in mesopelagic water (200–1000 m) in the South China Sea (SCS). The total particulate matter (TPM) increased by up to 32% in the mesopelagic layer comparing with the euphotic zone. The total 210Po/210Pb ratio varied from 0.41 to 0.98 with an average of 0.72 ± 0.19, showing an enhanced removal of 210Po in mesopelagic water. On average, particulate 210Po and 210Pb increased by 23% and 32% at the slope stations, respectively. These results indicated that the 210Po deficits result from lateral transport, probably via benthic nepheloid layer. Based on the deficiency of 210Po, the residence times of particulate 210Po were estimated to range from 0.11 to 0.25 year (avg. 0.17 ± 0.07 year), allowing resuspended sediment to disperse over a long range. The export fluxes of 210Po varied from 68 to 121 dpm m−2 d−1 with an average of 96 ± 27 dpm m−2 d−1, which was 6 times that out of the euphotic zone. Using the 210Po deficits, the export fluxes of TPM out of the mesopelagic layer were quantified to vary from 4.19 to 10.20 g m−2 d−1, revealing a large amount of particles from the shelf to the SCS basin. This study suggests that 210Po‐210Pb could be an effective tracer of tracking particle cycling in mesopelagic water.

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“…Following the biogeochemical interrelationships between oceanic carbon pools, we propose three alternative but not mutually exclusive pathways for the carbon sink: (i) it is exported out of the region as DOC, (ii) it is channelled through particulate carbon production (POC/PIC), or (iii) it is accumulated in the sediments. The low concentrations in POC and PIC in comparison with the DIC and DOC pools in the eSPNA (at least two orders of magnitude less than DIC) ( Le Moigne et al, 2013;Ceballos-Romero et al, 2016;Puigcorbé et al, 2017;Lemaitre et al, 2018) leads to the conclusion that the main DIC sink cannot be in POC and PIC pools.…”

Section: Fate Of Dic Sinkmentioning

confidence: 99%

Long-term integrated biogeochemical budget driven by circulation in the eastern subpolar North Atlantic

Fontela

Mercier

Pérez

2019

Progress in Oceanography

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The eastern subpolar North Atlantic (eSPNA) is a key region in the Atlantic Meridional Overturning Circulation (AMOC), playing an important role in biogeochemical cycles and climate regulation. Quantitative basin-scale biogeochemical budgets are still scarce despite the current need of establishing baselines of knowledge in a changing ocean. The physico-chemical data from the eight repetitions of the OVIDE section (2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014)(2015)(2016) are an unique opportunity to develop a novel evaluation of biogeochemical budgets in the eSPNA by combining robust and well established decadal mean mass transports with carbon variables, oxygen and inorganic nutrients in a full-depth inverse box model. The net balance between the carbon fixation and the respiration throughout the whole water column shows that the eSPNA is an important dissolved inorganic carbon (DIC) sink area where 119 ± 43 kmol·s-1 and 49 ± 31 kmol·s-1 of organic and inorganic carbon, respectively, are currently exported. The uptake due to mixed layer depth oxygenation of 807 ± 114 kmol·s-1 of oxygen from the atmosphere and its subsequent southward export are responsible for deep Atlantic Ocean oxygenation. Deep water formation processes connect the northward upper limb with the southward lower limb of the AMOC leading to tracer export to the deep ocean. With regard to the net macronutrient budgets, all element consumptions are balanced within uncertainties. The results presented here for carbon export and oxygen uptake are in agreement with the upper range of previous observations based on different methods. The findings of this integrated budget driven by circulation in the highly dynamic region of the eSPNA can be taken as a reference in future biogeochemical evaluations of the North Atlantic. Highlights► A large DIC sink due the biological pump is quantified in the eSPNA. ► The eSPNA is an autotrophic area of DIC sink (168±53 kmol·s -1 ) and oxygen uptake. ► Whole-water column biogeochemical budgets are based on 14 years of observations. ► Budgets of elements C, O, N, P and Si are consistently integrated and optimized.

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Influence of bloom dynamics on Particle Export Efficiency in the North Atlantic: a comparative study of radioanalytical techniques and sediment traps

Abstract: 21

Cited by 29 publications

References 95 publications

High variability of particulate organic carbon export along the North Atlantic GEOTRACES section GA01 as deduced from <sup>234</sup>Th fluxes

High variability of particulate organic carbon export along the North Atlantic GEOTRACES section GA01 as deduced from <sup>234</sup>Th fluxes

Utilizing ²¹⁰Po deficit to constrain particle dynamics in mesopelagic water, western South China Sea

Long-term integrated biogeochemical budget driven by circulation in the eastern subpolar North Atlantic

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Influence of bloom dynamics on Particle Export Efficiency in the North Atlantic: a comparative study of radioanalytical techniques and sediment traps

Abstract: 21

Cited by 29 publications

References 95 publications

High variability of particulate organic carbon export along the North Atlantic GEOTRACES section GA01 as deduced from &lt;sup&gt;234&lt;/sup&gt;Th fluxes

High variability of particulate organic carbon export along the North Atlantic GEOTRACES section GA01 as deduced from &lt;sup&gt;234&lt;/sup&gt;Th fluxes

Utilizing 210Po deficit to constrain particle dynamics in mesopelagic water, western South China Sea

Long-term integrated biogeochemical budget driven by circulation in the eastern subpolar North Atlantic

Contact Info

Product

Resources

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High variability of particulate organic carbon export along the North Atlantic GEOTRACES section GA01 as deduced from <sup>234</sup>Th fluxes

High variability of particulate organic carbon export along the North Atlantic GEOTRACES section GA01 as deduced from <sup>234</sup>Th fluxes

Utilizing ²¹⁰Po deficit to constrain particle dynamics in mesopelagic water, western South China Sea