Supply and demand of nutrients and dissolved organic matter at and across the NW European shelf break in relation to hydrography and biogeochemical activity

Hydes, D.J.; Gall, A. L.; Miller, Axel E. J.; Brockmann, U. H.; Raabe, Thomas; Holley, Sam; Álvarez-Salgado, X. Antón; Antia, AN; Balzer, Wolfgang; Chou, Lei; Elskens, Marc; Helder, W.; Joint, Ian; Orren, M. J.

doi:10.1016/s0967-0645(01)00031-5

Cited by 38 publications

(25 citation statements)

References 43 publications

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“…Chl-a increased rapidly in early April 2006 with the onset of the spring bloom and peaked in mid-April (Fig. 3), in agreement with previous observations in the area Hydes et al, 2001;Joint et al, 2001). A second peak of Chl-a was observed three weeks later, after which Chl-a concentration decreased, and remained low from early July onwards.…”

Section: Seasonal Evolution Of Key Remotely Sensed Biological and Modsupporting

confidence: 91%

Biogeochemistry and carbon mass balance of a coccolithophore bloom in the northern Bay of Biscay (June 2006)

Harlay

Chou

Bodt

et al. 2011

Deep Sea Research Part I: Oceanographic Research Papers

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a b s t r a c tPrimary production (PP), calcification (CAL), bacterial production (BP) and dark community respiration (DCR) were measured along with a set of various biogeochemical variables, in early June 2006, at several stations at the shelf break of the northern Bay of Biscay. The cruise was carried out after the main spring diatom bloom that, based on the analysis of a time-series of remotely sensed chlorophyll-a (Chl-a), peaked in mid-April. Remotely sensed sea surface temperature (SST) indicated the occurrence of enhanced vertical mixing (due to internal tides) at the continental slope, while adjacent waters on the continental shelf were stratified, as confirmed by vertical profiles of temperature acquired during the cruise. The surface layer of the stratified water masses (on the continental shelf) was depleted of inorganic nutrients. Dissolved silicate (DSi) levels probably did not allow significant diatom development. We hypothesize that mixing at the continental slope allowed the injection of inorganic nutrients that triggered the blooming of mixed phytoplanktonic communities dominated by coccolithophores (Emiliania huxleyi) that were favoured with regards to diatoms due to the low DSi levels. Based on this conceptual frame, we used an indicator of vertical stratification to classify the different sampled stations, and to reconstruct the possible evolution of the bloom from the onset at the continental slope (triggered by vertical mixing) through its development as the water mass was advected on-shelf and stratified. We also established a carbon mass balance at each station by integrating in the photic layer PP, CAL and DCR. This allowed computation at each station of the contribution of PP, CAL and DCR to CO 2 fluxes in the photic layer, and how they changed from one station to another along the sequence of bloom development (as traced by the stratification indicator). This also showed a shift from net autotrophy to net heterotrophy as the water mass aged (stratified), and suggested the importance of extracellular production of carbon to sustain the bacterial demand in the photic and aphotic layers.

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Section: Seasonal Evolution Of Key Remotely Sensed Biological and Modsupporting

confidence: 91%

Biogeochemistry and carbon mass balance of a coccolithophore bloom in the northern Bay of Biscay (June 2006)

Harlay

Chou

Bodt

et al. 2011

Deep Sea Research Part I: Oceanographic Research Papers

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“…This new production value is well within the range of Hydes et al (2001). Over a period of two months covering the spring bloom, our calculated value corresponds to a mean new production of 0.57 g C m À2 d À1 .…”

Section: à2supporting

confidence: 75%

“…Hydes et al (2001) suggested that the organic carbon production during the spring bloom might have ranged from 23 g C m À2 in regions of lower nitrate with a shallower thermocline, to 41 g C m À2 in regions of high nitrate with a deeper thermocline. We have considered that the average winter concentration of inorganic nitrogen (mainly NO 3 À ) equals 8.6 mmol kg À1 in the upper 100 m of the water column (see Fig.…”

mentioning

confidence: 99%

The carbon cycle at the ocean margin in the northern Gulf of Biscay

Wollast

Chou

2001

Deep Sea Research Part II: Topical Studies in Oceanography

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“…The high frequency data available from each of these variables could be used to further investigate the timing of the spring bloom in this area although there are numerous studies that have investigated bloom timing in this region using both in situ and remote sensing data (eg: Pingree, 1975;Garcia-Soto & Pingree, 1998;Garcia-Soto et al, 2002;Garcia-Soto & Pingree, 2009). Hydes et al, (2001) showed that nutrient concentrations below 300 m remained relatively consistent between cruises and from Hydes et al, 2001 nitrate profiles an increase in mixing from 200m to 400m…”

Section: Variation In Net Community Production In Relation To Nutrienmentioning

confidence: 99%

“…At temperate latitudes nutrient supply to the upper ocean in winter drives phytoplankton productivity and the uptake of carbon dioxide from the atmosphere in the following spring (Eppley & Peterson, 1979;Williams et al, 2000;Hydes et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Seasonal and inter-annual variability in nutrient supply in relation to mixing in the Bay of Biscay

Hartman

Hydes

Jiang

et al. 2014

Deep Sea Research Part II: Topical Studies in Oceanography

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Supply and demand of nutrients and dissolved organic matter at and across the NW European shelf break in relation to hydrography and biogeochemical activity

Cited by 38 publications

References 43 publications

Biogeochemistry and carbon mass balance of a coccolithophore bloom in the northern Bay of Biscay (June 2006)

Biogeochemistry and carbon mass balance of a coccolithophore bloom in the northern Bay of Biscay (June 2006)

The carbon cycle at the ocean margin in the northern Gulf of Biscay

Seasonal and inter-annual variability in nutrient supply in relation to mixing in the Bay of Biscay

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