Bio-optical provinces in the eastern Atlantic Ocean and their biogeographical relevance

Taylor, Bettina B; Torrecilla, Elena; Bernhardt, Anja; Taylor, Marc H; Peeken, Ilka; Röttgers, Rüdiger; Piera, Jaume; Bracher, Astrid

doi:10.5194/bg-8-3609-2011

Cited by 220 publications

(142 citation statements)

References 87 publications

(90 reference statements)

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“…All samples were analysed based on the HPLC method of Barlow et al (1997), as detailed in Hoffmann et al (2006). This method was adapted to our instrument (Waters 600, Waters, USA) and quality controlled as described in detail in Taylor et al (2011).…”

Section: Methodsmentioning

confidence: 99%

Algal pigments in Southern Ocean abyssal foraminiferans indicate pelagobenthic coupling

Cedhagen

Cheah

Bracher

et al. 2014

Deep Sea Research Part II: Topical Studies in Oceanography

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a b s t r a c tThe cytoplasm of four species of abyssal benthic foraminiferans from the Southern Ocean (around 511S; 121W and 501S; 391W) was analysed by High Performance Liquid Chromatography (HPLC) and found to contain large concentrations of algal pigments and their degradation products. The composition of the algal pigments in the foraminiferan cytoplasm reflected the plankton community at the surface. Some foraminiferans contained high ratios of chlorophyll a/degraded pigments because they were feeding on fresher phytodetritus. Other foraminiferans contained only degraded pigments which shows that they utilized degraded phytodetritus. The concentration of algal pigment and corresponding degradation products in the foraminiferan cytoplasm is much higher than in the surrounding sediment. It shows that the foraminiferans collect a diluted and sparse food resource and concentrate it as they build up their cytoplasm. This ability contributes to the understanding of the great quantitative success of foraminiferans in the deep sea. Benthic foraminiferans are a food source for many abyssal metazoans. They form a link between the degraded food resources, phytodetritus, back to the active metazoan food chains.

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Section: Methodsmentioning

confidence: 99%

Algal pigments in Southern Ocean abyssal foraminiferans indicate pelagobenthic coupling

Cedhagen

Cheah

Bracher

et al. 2014

Deep Sea Research Part II: Topical Studies in Oceanography

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“…This is based on the assumption that active fluorescence F is correlated to the amount of available T Chl a (Kolber and Falkowski, 1993). The method to convert fluorescence to T Chl a is described in detail in Taylor et al (2011). Mean conversion factors specific for each zone were determined for collocated F and HPLC-T Chl a (the sum of monovinyl Chl a, divinyl Chl a and Chlorophyllide a; the latter is mainly formed as artefact of the former two during the extraction process and therefore included in the calculation) measurements.…”

Section: Phytoplankton Pigment Analysis and Continuous Measurement Ofmentioning

confidence: 99%

“…Water samples were filtered onto GF/F filters, shock-frozen in liquid nitrogen and stored at −80 • C. Pigments listed in Table 1 of Taylor et al (2011) were analysed using a HPLC technique according to Barlow et al (1997) as described in Taylor et al (2011). Surface pigment data were already used in a study by Bracher et al (2015).…”

Section: Phytoplankton Pigment Analysis and Continuous Measurement Ofmentioning

confidence: 99%

Halocarbon emissions and sources in the equatorial Atlantic Cold Tongue

et al. 2015

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Abstract.Halocarbons from oceanic sources contribute to halogens in the troposphere, and can be transported into the stratosphere where they take part in ozone depletion. This paper presents distribution and sources in the equatorial Atlantic from June and July 2011 of the four compounds bromoform (CHBr 3 ), dibromomethane (CH 2 Br 2 ), methyl iodide (CH 3 I) and diiodomethane (CH 2 I 2 ). Enhanced biological production during the Atlantic Cold Tongue (ACT) season, indicated by phytoplankton pigment concentrations, led to elevated concentrations of CHBr 3 of up to 44.7 and up to 9.2 pmol L −1 for CH 2 Br 2 in surface water, which is comparable to other tropical upwelling systems. While both compounds correlated very well with each other in the surface water, CH 2 Br 2 was often more elevated in greater depth than CHBr 3 , which showed maxima in the vicinity of the deep chlorophyll maximum. The deeper maximum of CH 2 Br 2 indicates an additional source in comparison to CHBr 3 or a slower degradation of CH 2 Br 2 . Concentrations of CH 3 I of up to 12.8 pmol L −1 in the surface water were measured. In contrary to expectations of a predominantly photochemical source in the tropical ocean, its distribution was mostly in agreement with biological parameters, indicating a biological source. CH 2 I 2 was very low in the near surface water with maximum concentrations of only 3.7 pmol L −1 . CH 2 I 2 showed distinct maxima in deeper waters similar to CH 2 Br 2 . For the first time, diapycnal fluxes of the four halocarbons from the upper thermocline into and out of the mixed layer were determined. These fluxes were low in comparison to the halocarbon sea-to-air fluxes. This indicates that despite the observed maximum concentrations at depth, production in the surface mixed layer is the main oceanic source for all four compounds and one of the main driving factors of their emissions into the atmosphere in the ACTregion. The calculated production rates of the compounds in the mixed layer are 34 ± 65 pmol m −3 h −1 for CHBr 3 , 10 ± 12 pmol m −3 h −1 for CH 2 Br 2 , 21 ± 24 pmol m −3 h −1 for CH 3 I and 384 ± 318 pmol m −3 h −1 for CH 2 I 2 determined from 13 depth profiles.

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“…Filtered samples were then immediately shock-frozen in liquid nitrogen and stored at À 80°C until analysis. Measurements for particulate ½a p ðλÞ; m À 1 and detrital ½a d ðλÞ; m À 1 absorption were carried out using a Cary 4000 UV/VIS dual beam spectrophotometer equipped with a 150-mm integrating sphere (Varian Inc., USA) as described in Taylor et al (2011). Phytoplankton absorption [a ph (λ), m…”

Section: Mvchl-bmentioning

confidence: 99%

Importance of deep mixing and silicic acid in regulating phytoplankton biomass and community in the iron-limited Antarctic Polar Front region in summer

Cheah

Soppa

Wiegmann

et al. 2017

Deep Sea Research Part II: Topical Studies in Oceanography

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a b s t r a c tPhytoplankton community structure and their physiological response in the vicinity of the Antarctic Polar Front (APF; 44°S to 53°S, centred at 10°E) were investigated as part of the ANT-XXVIII/3 Eddy-Pump cruise conducted in austral summer 2012. Our results show that under iron-limited ð o 0:3 μmol m À 3 Þ conditions, high total chlorophyll-a (TChl-a) concentrations ð 40:6 mg m À 3 Þ can be observed at stations with deep mixed layer ð 4 60 mÞ across the APF. In contrast, light was excessive at stations with shallower mixed layer and phytoplankton were producing higher amounts of photoprotective pigments, diadinoxanthin (DD) and diatoxanthin (DT), at the expense of TChl-a, resulting in higher ratios of (DD þDT)/ TChl-a. North of the APF, significantly lower silicic acid (Si(OH) 4 ) concentrations ð o 2 mmol m À 3 Þ lead to the domination of nanophytoplankton consisting mostly of haptophytes, which produced higher ratios of (DD þDT)/TChl-a under relatively low irradiance conditions. The Si(OH) 4 replete ð 4 5 mmol m À 3 Þ region south of the APF, on the contrary, was dominated by microphytoplankton (diatoms and dinoflagellates) with lower ratios of (DD þDT)/TChl-a, despite having been exposed to higher levels of irradiance. The significant correlation between nanophytoplankton and (DD þDT)/TChl-a indicates that differences in taxon-specific response to light are also influencing TChl-a concentration in the APF during summer. Our results reveal that provided mixing is deep and Si(OH) 4 is replete, TChl-a concentrations higher than 0:6 mg m À 3 are achievable in the iron-limited APF waters during summer.

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Bio-optical provinces in the eastern Atlantic Ocean and their biogeographical relevance

Abstract: Postprint (published version

Cited by 220 publications

References 87 publications

Algal pigments in Southern Ocean abyssal foraminiferans indicate pelagobenthic coupling

Algal pigments in Southern Ocean abyssal foraminiferans indicate pelagobenthic coupling

Halocarbon emissions and sources in the equatorial Atlantic Cold Tongue

Importance of deep mixing and silicic acid in regulating phytoplankton biomass and community in the iron-limited Antarctic Polar Front region in summer

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