Modern coccolithophoridae of the atlantic ocean—I. Placoliths and cyrtoliths

McIntyre, Andrew; Bé, Allan W. H.

doi:10.1016/0011-7471(67)90065-4

Cited by 267 publications

(270 citation statements)

References 16 publications

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“…Of the coccolithophore species, Emiliania huxleyi is the most abundant, and its coccoliths can often be found from tropical to sub-arctic regions and further north into regions with water temperatures 0øC [Heimdal, 1983]. The distribution of E. huxleyi coccoliths in sediments generally matches the distribution of the overlying species in the water column [Mcintyre and Be, 1967].…”

mentioning

confidence: 73%

Retrieval of coccolithophore calcite concentration from SeaWiFS Imagery

Gordon¹,

Boynton²,

Balch³

et al. 2001

Geophysical Research Letters

129

107

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Abstract.We examined blooms of the coccolithophorid E. huxleyi, observed in SeaWiFS imagery, with a new algorithm for the retrieval of detached coccolith concentration. The algorithm uses only SeaWiFS bands in the red and near infrared (NIR) to minimize the influence of the absorption by chlorophyll and dissolved organic material. We used published experimental determinations of the calcite specific backscattering and its spectral dependence, and assumed that the absorption coefficient of the medium was that of pure water, to estimate the marine contribution to the SeaWiFS radiance. The aerosol (and Rayleigh-aerosol interaction) contribution to the radiance was modeled as an exponential function of wavelength. These allow derivation of the coccolith concentration on a pixel-by-pixel basis from SeaWiFS imagery. Application to a July 30, 1999 SeaWiFS image of a bloom south of Plymouth, UK indicates that the SeaWiFS estimates are in good agreement with surface measurements of coccolith concentration.

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mentioning

confidence: 73%

Retrieval of coccolithophore calcite concentration from SeaWiFS Imagery

Gordon¹,

Boynton²,

Balch³

et al. 2001

Geophysical Research Letters

129

107

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“…Coccolithophores, among which Emiliania huxleyi is the most abundant and widespread species, are considered to be the main productive calcifying organism on Earth and often form massive blooms in temperate and sub-polar oceans, in particular at continental margins and shelf seas (Brown and Yoder, 1994;Holligan et al, 1983;McIntyre and Be, 1967). Coccolithophores contribute to the export to depth of carbon by both primary production (PP) and calcification (CAL).…”

Section: Introductionmentioning

confidence: 99%

Particle export during a bloom of Emiliania huxleyi in the North-West European continental margin

Schmidt

Harlay

Borges

et al. 2013

Journal of Marine Systems

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Coccolithophores, the dominant pelagic calcifiers in the oceans, play a key role in the marine carbon cycle through calcification, primary production and carbon export, the main drivers of the biological CO 2 pump. In May 2002 a cruise was conducted on the outer shelf of the North-West European continental margin, from the north Bay of Biscay to the Celtic Sea (47.0°-50.5°N, 5.0°-11.0°W), an area where massive blooms of Emiliania huxleyi are observed annually. Biogeochemical variables including primary production, calcification, partial pressure of CO 2 (pCO 2 ), chlorophyll-a (Chl-a), particle load, particulate organic and inorganic carbon (POC, PIC) and 234 Th, were measured in surface waters to assess particle dynamic and carbon export in relation to the development of a coccolithophore bloom. We observed a marked northward decrease in Chl-a concentration and calcification rates: the bloom exhibited lower values and may be less well developed in the Goban Spur area. The export fluxes of POC and PIC from the top 80 m, determined using the ratios of POC and PIC to 234 Th of particles, ranged from 81 to 323 mg C m − 2 d − 1 and from 30 to 84 mg C m − 2 d − 1 , respectively. The highest fluxes were observed in waters presenting a well-developed coccolithophore bloom, as shown by high reflectance of surface waters. This experiment confirms that the occurrence of coccolithophores promotes efficient export of organic and inorganic carbon on the North-West European margin.

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“…In the modern oceans there is a general correlation between high-productivity environments and low-diversity coccolithophore assemblages, dominated by bloom-forming species such as Emiliania huxleyi, while oligotrophic environments are associated with diverse assemblages, often with a clear depth zonation and a distinct lower photic zone (LPZ) flora [Broerse et al, 2000;Kinkel et al, 2000;McIntyre and Bé, 1967;Okada and Honjo, 1973]. The response of the calcareous phytoplankton to global change through the Eocene-Oligocene boundary is poorly known when compared to other critical intervals such as the Paleocene-Eocene boundary [e.g., Bralower, 2002;Gibbs et al, 2006aGibbs et al, , 2006bRaffi et al, 2005].…”

Section: Introductionmentioning

confidence: 99%

Major shifts in calcareous phytoplankton assemblages through the Eocene‐Oligocene transition of Tanzania and their implications for low‐latitude primary production

et al. 2008

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A high‐resolution record of exceptionally well preserved calcareous nannofossil assemblages from Tanzania is marked by two key transitions closely related to the climatic events of the Eocene‐Oligocene transition (EOT). The first transition, at ∼34.0 Ma, precedes the first positive shift in δ18O and coincides with a distinct interval of very low nannofossil abundance and a cooling in sea surface temperatures (SST). The second, at ∼33.63 Ma, is immediately above the Eocene‐Oligocene boundary (EOB) and is associated with a significant drop in nannofossil diversity. Both transitions involve significant reductions in the abundance of holococcoliths and other oligotrophic taxa. These changes in calcareous phytoplankton assemblages indicate (1) a widespread and significant perturbation to the low‐latitude surface ocean closely tied to the EOB, (2) a potential role for reduced carbonate primary production at the onset of global cooling, and (3) a significant increase in nutrient availability in the low‐latitude surface ocean through the EOT.

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Modern coccolithophoridae of the atlantic ocean—I. Placoliths and cyrtoliths

Cited by 267 publications

References 16 publications

Retrieval of coccolithophore calcite concentration from SeaWiFS Imagery

Retrieval of coccolithophore calcite concentration from SeaWiFS Imagery

Particle export during a bloom of Emiliania huxleyi in the North-West European continental margin

Major shifts in calcareous phytoplankton assemblages through the Eocene‐Oligocene transition of Tanzania and their implications for low‐latitude primary production

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