Carbon, alkalinity and nutrient budgets on the East China Sea continental shelf

Chen, Chen‐Tung Arthur; Wang, Shu-Lun

doi:10.1029/1999jc900055

Cited by 351 publications

(273 citation statements)

References 32 publications

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“…Time and again, the East China Sea (ECS) has been found to be a sink of CO 2 (Chen and Wang 1999;Tsunogai et al 1999;Chou et al 2009a;Zhai and Dai 2009;Tseng et al 2011). This is in part because the Changjiang River not only exports a significant amount of nutrients to the ECS but also a large quantity of freshwater, which also helps to induce an estuarine type flow.…”

Section: Co 2 In the Changjiang River Plumementioning

confidence: 99%

“…This is in part because the Changjiang River not only exports a significant amount of nutrients to the ECS but also a large quantity of freshwater, which also helps to induce an estuarine type flow. That is, the lighter, fresher water flows out of the shelf on the surface, whereas the subsurface, nutrient-rich waters upwell onto the shelf (Chen and Wang 1999;Chen et al 2008). The high biological production associated with nutrients brought by the river and this upwelling reduces the pCO 2 in surface waters to below 200 µatm in the area affected by the Changjiang River plume most of the year.…”

Section: Co 2 In the Changjiang River Plumementioning

confidence: 99%

See 1 more Smart Citation

Carbon dioxide dynamics and fluxes in coastal waters influenced by river plumes

Cai

Chen²,

Borges³

2013

Biogeochemical Dynamics at Major River-Coastal Interfaces

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Section: Co 2 In the Changjiang River Plumementioning

confidence: 99%

Section: Co 2 In the Changjiang River Plumementioning

confidence: 99%

Carbon dioxide dynamics and fluxes in coastal waters influenced by river plumes

Cai

Chen²,

Borges³

2013

Biogeochemical Dynamics at Major River-Coastal Interfaces

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“…Recent studies suggest that nitrate influx by the KC is presently 1.5-3.4 times the river loading (Li, 1994;Chen and Wang, 1999;Liu et al, 2000). Thus the KIW is the main supplier of nutrients to the ECS (Chen, 1996), of which the OT serves as a boundary and a sink for the shelf production.…”

Section: Study Areamentioning

confidence: 99%

North Pacific-wide spreading of isotopically heavy nitrogen during the last deglaciation: Evidence from the western Pacific

et al. 2008

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Abstract. Sedimentary δ 15 N records in two IMAGES cores (MD012404 and MD012403) retrieved from the Okinawa Trough (OT) in the western North Pacific reveal deglacial increases with two peaks occurring during the Bølling/Allerød and the Preboreal/early Holocene periods. These peaks are synchronous with previously reported δ 15 N peaks in the Eastern Tropical North Pacific, although the amplitudes (from 3.8 to 5.8‰) are much smaller in the OT. Similar δ 15 N values for the last glacial maximum and the late-Holocene observed by us at a site far from the present-day zones of water-column denitrification (WCD) indicate that the mean 15 N/ 14 N of nitrate in the upper ocean did not differ much between the two climate states. The accumulation rate of organic carbon and total sulfur content are used as indices of the local WCD potential. The results suggest that enhancement of global WCD rather than local denitrification should be responsible for the deglacial maxima of sedimentary δ 15 N in the Okinawa Trough. Our data could provide additional constraints to better understand changes in nitrogen budget during the glacial to interglacial transition.

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“…However, it remains an open question whether this A T export from the Wadden Sea drives any CO 2 uptake in the North Sea (maybe the A T -induced CO 2 uptake has already taken place in the Wadden Sea), and also, how important the sediments of the North Sea proper are in driving CO 2 uptake in the North Sea. In the East China Sea it was already suggested by Chen and Wang (1999) that alkalinity generation due to anaerobic degradation processes in sediments adds considerably to the total alkalinity budget in this area. Furthermore, Chen (2002) proposed that shelf-generated alkalinity release from benthic anaerobic processes could be almost as important as alkalinity generated by dissolution of carbonates in the open ocean.…”

Section: Introductionmentioning

confidence: 99%

“…As main sources of A T , these authors propose denitrification together with sulfate reduction and/or silicate weathering. Chen and Wang (1999) estimated that sediments in the East China Sea generate between 2.9 and 4.9 mmol m −2 d −1 A T . Over 80 % of this A T flux was thereby attributed to iron and sulfate reduction, with no contribution from carbonate dissolution.…”

Section: Benthic Alkalinity Release In the North Seamentioning

confidence: 99%

The impact of sedimentary alkalinity release on the water column CO<sub>2</sub> system in the North Sea

et al. 2016

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Abstract. It has been previously proposed that alkalinity release from sediments can play an important role in the carbonate dynamics on continental shelves, lowering the pCO 2 of seawater and hence increasing the CO 2 uptake from the atmosphere. To test this hypothesis, sedimentary alkalinity generation was quantified within cohesive and permeable sediments across the North Sea during two cruises in September 2011 (basin-wide) and June 2012 (Dutch coastal zone). Benthic fluxes of oxygen (O 2 ), alkalinity (A T ) and dissolved inorganic carbon (DIC) were determined using shipboard closed sediment incubations. Our results show that sediments can form an important source of alkalinity for the overlying water, particularly in the shallow southern North Sea, where high A T and DIC fluxes were recorded in nearshore sediments of the Belgian, Dutch and German coastal zone. In contrast, fluxes of A T and DIC are substantially lower in the deeper, seasonally stratified, northern part of the North Sea. Based on the data collected, we performed a model analysis to constrain the main pathways of alkalinity generation in the sediment, and to quantify how sedimentary alkalinity drives atmospheric CO 2 uptake in the southern North Sea. Overall, our results show that sedimentary alkalinity generation should be regarded as a key component in the CO 2 dynamics of shallow coastal systems.

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Carbon, alkalinity and nutrient budgets on the East China Sea continental shelf

Cited by 351 publications

References 32 publications

Carbon dioxide dynamics and fluxes in coastal waters influenced by river plumes

Carbon dioxide dynamics and fluxes in coastal waters influenced by river plumes

North Pacific-wide spreading of isotopically heavy nitrogen during the last deglaciation: Evidence from the western Pacific

The impact of sedimentary alkalinity release on the water column CO<sub>2</sub> system in the North Sea

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Carbon, alkalinity and nutrient budgets on the East China Sea continental shelf

Cited by 351 publications

References 32 publications

Carbon dioxide dynamics and fluxes in coastal waters influenced by river plumes

Carbon dioxide dynamics and fluxes in coastal waters influenced by river plumes

North Pacific-wide spreading of isotopically heavy nitrogen during the last deglaciation: Evidence from the western Pacific

The impact of sedimentary alkalinity release on the water column CO&lt;sub&gt;2&lt;/sub&gt; system in the North Sea

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The impact of sedimentary alkalinity release on the water column CO<sub>2</sub> system in the North Sea