Fluxes and seasonal changes in composition of organic matter in the English Channel

Bodineau, Laurent; Thoumelin, Guy; Wartel, M.

doi:10.1016/s0278-4343(99)00055-2

Cited by 20 publications

(12 citation statements)

References 26 publications

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“…Last, the transfer of DIC and organic carbon from inner estuaries to the adjacent coastal area can lead to significant air‐sea CO 2 emissions [e.g., Borges and Frankignoulle , 1999, 2002a]. Little data are available concerning carbon fluxes from rivers or estuaries to the channel, except the flux of total organic carbon from the river Seine to the channel that amounts to 27.4 × 10 6 mol C d −1 [ Cossa et al , 1994; Bodineau et al , 1999]. If we assume that all of this organic carbon is respired, then it would produce a potential CO 2 emission for the entire channel of 0.33 mmol C m −2 d −1 .…”

Section: Resultsmentioning

confidence: 99%

Distribution of surface carbon dioxide and air‐sea exchange in the English Channel and adjacent areas

Borges

Frankignoulle

2003

J. Geophys. Res.

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[1] In the present paper we report the distribution of the partial pressure of CO 2 (pCO 2 ) in surface waters along 13 transects in the English Channel, covering the four seasons. The spatial and temporal variability of pCO 2 is controlled by a complex combination of primary production (from May to June), degradation of organic matter, temperature change, and freshwater inputs. Preliminary air-sea CO 2 exchange computations suggest that the Channel is not a major sink of atmospheric CO 2 and is probably neutral from the point of view of atmospheric coupling. This is mainly related to a relatively low export and/or burial of organic carbon and intense benthic calcification.

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Section: Resultsmentioning

confidence: 99%

Distribution of surface carbon dioxide and air‐sea exchange in the English Channel and adjacent areas

Borges

Frankignoulle

2003

J. Geophys. Res.

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“…Similarly, higher trophic levels from zooplankton to fishes and marine mammals also contribute to the production of the autochthonous DOC. Allochthonous DOC concentrations in coastal waters are generally regulated by terrestrial or riverine input (Hedges et al 1997;Bodineau et al 1999). Seasonal autochthonous and allochthonous sources with biogeochemical activity make a large contribution to the total amount of DOC present in the coastal area (Cauwet 2002).…”

Section: Introductionmentioning

confidence: 99%

Seasonal distribution, sources and sink of dissolved organic carbon in integrated aquaculture system in coastal waters

et al. 2016

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Dissolved organic carbon (DOC) concentrations were measured in the Sanggou Bay (SGB) in northern China, in order to investigate the seasonal distribution, sources and sink of DOC in an integrated multi-trophic aquaculture (IMTA) system of fish, shellfish and seaweed. The sampling was conducted during April (spring), August (summer), October (autumn) and January (winter) of 2011-2012. Salinity, Chlorophyll a (Chl a) and DOC showed large spatial and seasonal variation during sampling period. DOC increased with increasing Chl a in spring, summer and autumn and decreased with increasing salinity in summer compared to other seasons. Maximum surface concentration of DOC ranged from 108.0 to 875.2 lM and minimum from 134.4 to 184.7 lM was found during summer and spring, respectively. Terrestrial input, phytoplankton and seaweed were the main sources of DOC in SGB. Shellfish farming area was enriched in organic matter as well as served to reduce DOC levels in the bay. As it was indicated that average annual removal of 42 % DOC occurred in the shellfish, the lowest occurred at an average 32 % in combined shellfish and seaweed culture area. Additionally, controlled experiment results showed that seaweed produced approximately 64.81 ± 40.86 lM day -1 and shellfish generated approximately 13.36 ± 6.07 lM day -1 and assimilated 17.07 ± 13.12 lM day -1 DOC in SGB. Accumulation of DOC at the bottom could be a result of long-term aquaculture activities in the bay. Integration of sea cucumber into IMTA system could be useful to mitigate the stockpile of organic matter at the bottom.

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“…This idea was well supported by high chlorophyll a concentration and the high contributions from bacterial biomarker compounds within the same salinity range. The increase in DOC concentrations during and after the bloom is in response to biological activity [55], which also reflects the lability of organic matter within the estuary. Bacterial utilization of labile DOC estimated from the degradation experiment ( Figure 7C) revealed that 38% of DOC was utilized over a 70 day incubation period.…”

Section: Behaviour and Reactivity Of Doc In The Estuarymentioning

confidence: 99%

Fluxes and retention of nutrients and organic carbon in Manko estuary, Okinawa, Japan: influence of river discharge variations

Shilla

2014

Advances in Oceanography and Limnology

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Estuaries are often considered important filters for inorganic and organic nutrients, as they are located between the land and sea. This study reports on the fluvial fluxes and estuarine transformations and retention of dissolved nutrients (total oxidized nitrogen [TON D NO 2 ¡ and NO 3 ¡ ]), NH 4 C , PO 4 3¡, and dissolved organic carbon (DOC) in Manko estuary, Okinawa, Japan. The transport and transformation of dissolved nutrients and DOC varied widely among the eight conducted surveys due to variations in freshwater discharge and subsequent flushing times. Under high fluvial discharge, particularly during the MayÀJune rainy season, the transport of nutrients and DOC accounted for up to 70%, 88%, 93%, and 53% of the annual transport of TON, NH 4 C , PO 4 3¡ , and DOC, respectively. The flushing times of river water into the estuary, which varied from 0.5 to 46 days, were important in determining the degree to which fluvial nutrients were transformed and retained within the estuary. The effect of long flushing times was evident during the dry months (DecemberÀMarch), when biological and geochemical processes within the estuary removed most of the fluvial nutrients and DOC.

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Fluxes and seasonal changes in composition of organic matter in the English Channel

Cited by 20 publications

References 26 publications

Distribution of surface carbon dioxide and air‐sea exchange in the English Channel and adjacent areas

Distribution of surface carbon dioxide and air‐sea exchange in the English Channel and adjacent areas

Seasonal distribution, sources and sink of dissolved organic carbon in integrated aquaculture system in coastal waters

Fluxes and retention of nutrients and organic carbon in Manko estuary, Okinawa, Japan: influence of river discharge variations

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