Cyclonic cold-core eddy in the eastern North Atlantic. I Physical description

Mittelstaedt, Ekkehard

doi:10.3354/meps039145

Cited by 31 publications

(19 citation statements)

References 5 publications

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“…4b) show that at Stn 164 the surface values persisted into greater depth than at other stations. This may indicate some degree of downwelling or rather vertical mixing at this station, as here highest geostrophic velocities were estimated for the upper part of the water column down to about 250 m depth (Mittelstaedt 1987). When the eddy originally formed, Kupferman et al (1986) observed slightly higher orthophosphate and silicate concentrations in its core in comparison to the ambient water.…”

Section: Physical Conditionsmentioning

confidence: 92%

“…The mechanism of formation of a cyclonic cold-core eddy from a Polar Front meander has been described by Kupferman et al (1986) and Mittelstaedt (1987). When it was first detected in April 1985, it had the form of a meander nearly 300 km long and only 40 km wide extending south-eastwards from the Polar Front (Kupferman et al 1986).…”

Section: Biotrans Publication Nomentioning

confidence: 99%

“…By the time of the present investigations the eddy had cut off from the Polar Front forming a n isolated mesoscale feature. At the surface it had a diameter of about 100 km widening to about 200 km at greater depth (Mittelstaedt 1987). The oceanographic surveys showed that the eddy was evident down to a depth of at least 2500 m and possibly to even greater depths (Kupferman et al 1986).…”

Section: Biotrans Publication Nomentioning

confidence: 99%

“…Temperature and salinity were measured by a conductivity-temperature-depth system (CTD); further details on the methodology and the physical oceanography of the eddy are described by Mittelstaedt (1987). Zooplankton surveys are presented by Beckmann et al (1987).…”

Section: Methodsmentioning

confidence: 99%

“…In the eastern part of the North Atlantic eddies have seldom been investigated (Le Groupe Tourbillon 1983, Kupferman et al 1986, Mittelstaedt 1987. They have only been studied with respect to their physical properties, but their impact on the distribution of nutrients, development and growth of planktonic organisms has not yet been described.…”

Section: Biotrans Publication Nomentioning

confidence: 99%

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Cyclonic cold-core eddy in the eastern North Atlantic. II. Nutrients, phytoplankton and bacterioplankton

Lochte¹,

Pfannkuche²

1987

Mar. Ecol. Prog. Ser.

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A cyclonic cold-core eddy in the Northeast Atlantic of about 100 km in diameter at the sea surface was investigated in May 1985, approximately 3 wk after it had separated from the Polar Front. A strong thermocline, which was shallower but more pronounced than in the ambient water, separated a warm surface layer within the eddy from deeper cold water, while horizontal salinity gradients marked the boundary to the ambient water. The cold-core eddy could be distinguished from amblent Northeast Atlantic water in terms of its nutrient chemistry, phytoplankton species distribution and abundance, bacterial numbers and cell size. The surface layer of the eddy was distinct from deeper eddy water, and was characterized by high concentrations of chlorophyll a, total phytoplankton biomass, dinoflagellates and bacteria. At the eddy's margin diatoms were predominant. It is argued that the physical isolation of the eddy surface layer due to the formation of a shallow thermocline led to rapid utilisation of nutrients. This probably enabled the development of a dinoflagellate-dominated phytoplankton population and of organisms capable of heterotrophic regenerative processes.

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Section: Physical Conditionsmentioning

confidence: 92%

Section: Biotrans Publication Nomentioning

confidence: 99%

Section: Biotrans Publication Nomentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Biotrans Publication Nomentioning

confidence: 99%

See 3 more Smart Citations

Cyclonic cold-core eddy in the eastern North Atlantic. II. Nutrients, phytoplankton and bacterioplankton

Lochte¹,

Pfannkuche²

1987

Mar. Ecol. Prog. Ser.

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Unmixing of stable isotope signals using single specimen δ¹⁸O analyses

Wit

Reichart

Ganssen

2013

Geochem Geophys Geosyst

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[1] The resolution at which foraminiferal stable isotopes are applied in paleo-environmental studies is ever increasing, resulting in continuous sampling of sediment cores. The resolution of such continuously sampled records depends on the rate of sedimentation of foraminiferal shells in its relation to the intensity of bioturbation. Bioturbation essentially mixes sediment layers of different age, altering the primary climate signal, thereby impacting the accuracy of both the timing and magnitude of reconstructed climate changes. A new approach to assess and correct the impact of bioturbation is investigated here, based on the d 18 O of individual specimens of planktonic foraminifera Globorotalia inflata from a series of boxcore samples in the Eastern North Atlantic. Average d 18 O values decrease southward from 1.62 to 1.07% with the exception of site T86-11 (1.35%). The d 18 O distribution of each station can be fitted with a uni-to polymodal distribution. A nonunimodal distribution strongly suggests admixing of bioturbated individuals. Quantification of these distributions allows deconvolving the original and bioturbated signals and subsequently provides a correction for bioturbation.

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Deep-Sea Food Chains and the Global Carbon Cycle

Rowe¹,

Pariente²

1992

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A Series presenting the results of activities sponsored by the NA TO Science Committee, which aims at the dissemination of advanced scientific and technological knowledge, with a view to strengthening links between scientific communities.The electronic index to the NATO ASI Series provides full bibliographical references (with keywords and/or abstracts) to more than 30000 contributions from international scientists published in all sections of the NATO ASI Series. Access to the NATO-PCO-DATA BASE is possible in two ways: -via online FILE 128 (NATO-PCO-DATA BASE) hosted by ESRIN,

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Cyclonic cold-core eddy in the eastern North Atlantic. I Physical description

Cited by 31 publications

References 5 publications

Cyclonic cold-core eddy in the eastern North Atlantic. II. Nutrients, phytoplankton and bacterioplankton

Cyclonic cold-core eddy in the eastern North Atlantic. II. Nutrients, phytoplankton and bacterioplankton

Unmixing of stable isotope signals using single specimen δ¹⁸O analyses

Deep-Sea Food Chains and the Global Carbon Cycle

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Cyclonic cold-core eddy in the eastern North Atlantic. I Physical description

Cited by 31 publications

References 5 publications

Cyclonic cold-core eddy in the eastern North Atlantic. II. Nutrients, phytoplankton and bacterioplankton

Cyclonic cold-core eddy in the eastern North Atlantic. II. Nutrients, phytoplankton and bacterioplankton

Unmixing of stable isotope signals using single specimen δ18O analyses

Deep-Sea Food Chains and the Global Carbon Cycle

Contact Info

Product

Resources

About

Unmixing of stable isotope signals using single specimen δ¹⁸O analyses