Stratification of dissolved organic matter in the upper 2000 m water column at the Mariana Trench

Li, Penghui; Tao, Jianchang; Lin, Jian; Shi, Quan; Li, Xinxin; Zhang, Chuanlun

doi:10.1016/j.scitotenv.2019.03.094

Cited by 30 publications

(20 citation statements)

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“…The long‐term incubation shows the almost depleted of labile SDOM (Figure c) and the accumulation of relatively refractory DOM by FDOM analysis (supporting information Figure S4). With the FT‐ICR‐MS analysis, the overall properties of the residual SDOM indicate that the SDOM was microbially modified to a higher unsaturated state and likely containing more aromatic rings in molecules, these properties of residue SDOM are similar to the properties of deep‐sea RDOM (Catalá et al, ; Flerus et al, ; Hertkorn et al, ; Lechtenfeld et al, ; Li et al, ; Medeiros et al, ). The chemical changes of DOM properties (Table ) combined with the succession of microbial community (Figure b) observed in our study might reflect the generation of RDOM via the microbial carbon pump (Jiao et al, ), which proposes that the microbial successive processing on labile DOM generates long‐lived RDOM in the water column (Jiao et al, ; Jiao et al, ).…”

Section: Resultsmentioning

confidence: 97%

“…These calibrant formulas also matched with seawater DOM. Molecular formulas were assigned with the calibrated mass data using an in‐house software (Li et al, ). All assigned formulas had to meet the following basic chemical criteria: (1) the number of H atoms cannot exceed 2C + N + 2; (2) the sum of H and N atoms must be even (the “nitrogen rule”); and (3) the number of N or O atoms cannot exceed the number of C atoms (Flerus et al, ; Koch et al, ; Kujawinski & Behn, ).…”

Section: Methodsmentioning

confidence: 99%

“…This again indicates that heterotrophic bacteria preferentially utilized more saturated compounds, and produced organic molecules that have more unsaturated structures. Previous studies found that decreasing DOM Δ 14 C values go along with a shift in the molecular composition with increasing average Mass and DBE, but H/C ratios decrease when DOM sampling is conducted from surface to the deeper ocean (Flerus et al, 2012;Lechtenfeld et al, 2014;Li et al, 2019;Medeiros et al, 2015). In our incubation study, the transformation of SDOM during the 110 days (decreasing H/C a from 1.284 ± 0.001 to 1.241 ± 0.001, increasing Mass a from 426.730 ± 0.046 to 455.346 ± 3.166 and DBE a from 8.764 ± 0.033 to 9.498 ± 0.017) is somewhat similar to the trends observed in the water column DOM and changes observed from surface to deeper ocean waters (mentioned above), where has a relatively high content of RDOM that resist microbial degradation (Barber, 1968;Hansell, 2013;Hedges, 1992;Hertkorn et al, 2013;Hertkorn et al, 2006).…”

Section: Journal Of Geophysical Research: Biogeosciencesmentioning

confidence: 97%

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Microbial Processing of Sediment‐Derived Dissolved Organic Matter: Implications for Its Subsequent Biogeochemical Cycling in Overlying Seawater

et al. 2019

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Coastal sediments contain a large amount of dissolved organic matter (DOM), which can be mobilized into the overlying water by natural and anthropogenic activities. The bioavailability and subsequent biogeochemical effects of this sediment-derived DOM are unclear. To investigate those, we collected a sediment pore-water DOM (SDOM) sample and its overlying seawater to conduct a bioassay experiment, which allowed tracking of both short-term and long-term microbial processes in the context of DOM transformations. Short-term incubation results show that the SDOM extract supported the growth of specific taxa. The microbial community composition changed dramatically and an approximately 50% of SDOM-derived carbon was consumed within the first 2 days. Viruses likely played a role in promoting bacterial community succession, further enhancing transformation of this SDOM. Long-term incubation results show that labile DOM was gradually consumed, while approximately 16% of the initial SDOM appeared to be recalcitrant to microbial utilization and remained at the end (after 110 days) of the incubation experiment. Despite the short-term drastic changes in microbial community composition, a highly diverse microbial community is similar to the control at the end of the incubation. It is suggested here that resuspension of coastal sediments weakens their role as a net sink of carbon, with most of the mobilized SDOM transformed by successive microbial communities in the overlying seawater and the remaining recalcitrant organic material becoming part of the long-lived DOM pool. Thus, the bioavailability of the coastal SDOM might influence the carbon budget in coastal oceans.

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Section: Resultsmentioning

confidence: 97%

Section: Methodsmentioning

confidence: 99%

Section: Journal Of Geophysical Research: Biogeosciencesmentioning

confidence: 97%

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Microbial Processing of Sediment‐Derived Dissolved Organic Matter: Implications for Its Subsequent Biogeochemical Cycling in Overlying Seawater

et al. 2019

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“…The first 'Challenger Deep' expedition was conducted by the R/V Shiyan 3 of the South China Sea Institute of Oceanology (SCSIO) in December 2016, in which a variety of multidisciplinary experiments were carried out, including physical oceanography, sediment sampling, gravity and magnetic measurements, and active and passive source seismic survey (Lin et al 2017;Li et al 2019). The active source seismic experiment lasted 2 weeks from 1 December 2016 with 18 OBSs deployed along a ∼350-km-long NW-SE-trending profile across the Challenger Deep (Fig.…”

Section: E X P E D I T I O N S a N D O B S E X P E R I M E N T Smentioning

confidence: 99%

Along-strike variation in slab geometry at the southern Mariana subduction zone revealed by seismicity through ocean bottom seismic experiments

Zhu

Yang

Lin

et al. 2019

Geophysical Journal International

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SUMMARYWe have conducted the first passive Ocean Bottom Seismograph (OBS) experiment near the Challenger Deep at the southernmost Mariana subduction zone by deploying and recovering an array of 6 broad-band OBSs during December 2016–June 2017. The obtained passive-source seismic records provide the first-ever near-field seismic observations in the southernmost Mariana subduction zone. We first correct clock errors of the OBS recordings based on both teleseismic waveforms and ambient noise cross-correlation. We then perform matched filter earthquake detection using 53 template events in the catalogue of the US Geological Survey and find >7000 local earthquakes during the 6-month OBS deployment period. Results of the two independent approaches show that the maximum clock drifting was ∼2 s on one instrument (OBS PA01), while the rest of OBS waveforms had negligible time drifting. After timing correction, we locate the detected earthquakes using a newly refined local velocity model that was derived from a companion active source experiment in the same region. In total, 2004 earthquakes are located with relatively high resolution. Furthermore, we calibrate the magnitudes of the detected earthquakes by measuring the relative amplitudes to their nearest relocated templates on all OBSs and acquire a high-resolution local earthquake catalogue. The magnitudes of earthquakes in our new catalogue range from 1.1 to 5.6. The earthquakes span over the Southwest Mariana rift, the megathrust interface, forearc and outer-rise regions. While most earthquakes are shallow, depths of the slab earthquakes increase from ∼100 to ∼240 km from west to east towards Guam. We also delineate the subducting interface from seismicity distribution and find an increasing trend in dip angles from west to east. The observed along-strike variation in slab dip angles and its downdip extents provide new constraints on geodynamic processes of the southernmost Mariana subduction zone.

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“…The following ranges were used: lipids (0 < O/C ≤ 0.3, 1.5 ≤ H/C ≤ 2.0), aliphatic/proteins (0.3 ≤ O/C < 0.67, 1.5 ≤ H/C ≤ 2.2), lignins/CRAM-like structures (0.1 ≤ O/C ≤ 0.67, 0.7 ≤ H/C ≤ 1.5), carbohydrates (0.67 < O/C ≤ 1.2, 1.5 ≤ H/C ≤ 2.4), unsaturated hydrocarbons (0.7 ≤ O/C ≤ 1.5, 0 < H/C ≤ 0.1), aromatic structures (0 < O/C ≤ 0.67, 0.2 ≤ H/C < 0.7), and tannins (0.67 < O/C ≤ 1.0, 0.6 ≤ H/C ≤ 1.5). The limitation of the categorization of compound groups from FT-ICR MS should be noted, as it is only based on the elemental ratios without structural information of DOM ( Li et al, 2019 ).…”

Section: Methodsmentioning

confidence: 99%

Vertical Stratification of Dissolved Organic Matter Linked to Distinct Microbial Communities in Subtropic Estuarine Sediments

Wang

Tao

et al. 2021

Front. Microbiol.

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Dissolved organic matter (DOM) provides carbon substrates and energy sources for sediment microbes driving benthic biogeochemical processes. The interactions between microbes and DOM are dynamic and complex and require the understanding based on fine-scale microbial community and physicochemical profiling. In this study, we characterized the porewater DOM composition in a 300-cm sediment core from the Pearl River estuary, China, and examined the interactions between DOM and archaeal and bacterial communities. DOM composition were highly stratified and associated with changing microbial communities. Compared to bacteria, the amplicon sequence variants of archaea showed significant Pearson correlations (r ≥ 0.65, P < 0.01) with DOM molecules of low H/C ratios, high C number and double bond equivalents, indicating that the distribution of archaea was closely correlated to recalcitrant DOM while bacteria were associated with relatively labile compounds. This was supported by the presence of auxiliary enzyme families essential for lignin degradation and bcrABCD, UbiX genes for anaerobic aromatic reduction in metagenome-assembled genomes of Bathyarchaeia. Our study demonstrates that niche differentiation between benthic bacteria and archaea may have important consequences in carbon metabolism, particularly for the transformation of recalcitrant organic carbon that may be predominant in aged marine sediments.

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Stratification of dissolved organic matter in the upper 2000 m water column at the Mariana Trench

Cited by 30 publications

References 52 publications

Microbial Processing of Sediment‐Derived Dissolved Organic Matter: Implications for Its Subsequent Biogeochemical Cycling in Overlying Seawater

Microbial Processing of Sediment‐Derived Dissolved Organic Matter: Implications for Its Subsequent Biogeochemical Cycling in Overlying Seawater

Along-strike variation in slab geometry at the southern Mariana subduction zone revealed by seismicity through ocean bottom seismic experiments

Vertical Stratification of Dissolved Organic Matter Linked to Distinct Microbial Communities in Subtropic Estuarine Sediments

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Stratification of dissolved organic matter in the upper 2000 m water column at the Mariana Trench

Cited by 30 publications

References 52 publications

Microbial Processing of Sediment‐Derived Dissolved Organic Matter: Implications for Its Subsequent Biogeochemical Cycling in Overlying Seawater

Microbial Processing of Sediment‐Derived Dissolved Organic Matter: Implications for Its Subsequent Biogeochemical Cycling in Overlying Seawater

Along-strike variation in slab geometry at the southern Mariana subduction zone revealed by seismicity through ocean bottom seismic experiments

Vertical Stratification of Dissolved Organic Matter Linked to Distinct Microbial Communities in Subtropic Estuarine Sediments

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Stratification of dissolved organic matter in the upper 2000 m water column at the Mariana Trench