Wind-triggered events of phytoplankton downward flux in the Northeast Water Polynya

Pesant, Stéphane; Legendre, Louis; Gosselin, Michel; Bauerfeind, Eduard; Budéus, Gereon

doi:10.1016/s0924-7963(01)00065-3

Cited by 20 publications

(9 citation statements)

References 50 publications

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“…The northeast Atlantic is characterized by episodic wind events [ Stramska et al , 1995] and a meteorological buoy located in the study area (41.6°N, 20.0°W) has recorded highly variable winds (range 0–20 m s −1 ) from January to August 2001 (http://www.lodyc.jussieu.fr/POMME). Pesant et al [2002] have shown that increased mixing has a big importance for the removal of phytoplankton from the surface. Wind‐triggered events of phytoplankton downward flux can also be responsible for the occurrence of the two sedimentation episodes of spring 2001 as especially high winds (up to 19 m s −1 ) are recorded in the area by mid‐April.…”

Section: Discussionmentioning

confidence: 99%

Silica fluxes in the northeast Atlantic frontal zone of Mode Water formation (38°–45°N, 16°–22°W) in 2001–2002

Mosseri¹

2005

J. Geophys. Res.

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[1] The biogenic (BSi) and lithogenic (LSi) silica export fluxes were investigated in the northeast Atlantic (38°- at 1000 m) was lower than BSi and accounted for 10% of the total silica export flux.45°NResults show a strong coupling between the two siliceous particulate fractions, which is interpreted as reflecting LSi scavenging by BSi and limitation of BSi production in surface water by lithogenic (trace metals) inputs. BSi export was maximum at the beginning of the productive season during the spring bloom. However, annual BSi export fluxes in 2001 were quite higher at 400 m in the southern area (e.g., 0.249-0.288 at the southeast station versus 0.211 mmol BSi m À2 d À1 at the northeast station) contradictory to the classical south-north surface production increase. We suggest an advective lateral transport within the upper 400 m of siliceous particles from the northern, more productive area to the southern region.

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Section: Discussionmentioning

confidence: 99%

Silica fluxes in the northeast Atlantic frontal zone of Mode Water formation (38°–45°N, 16°–22°W) in 2001–2002

Mosseri¹

2005

J. Geophys. Res.

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“…Phytoplankton biomass and photosynthetic capacity were fractionated into three size classes (large, medium, small), by serial filtration on 20 μ m mesh, 5 μ m mesh and Whatman GF/F glass‐fibre filter (0.7 μ m), following the methods in many marine studies (Rodriguez & Guerrero, 1994; Marañón et al. , 2001; Pesant et al. , 2002).…”

Section: Methodsmentioning

confidence: 99%

“…Phytoplankton biomass and photosynthetic capacity were fractionated into three size classes (large, medium, small), by serial filtration on 20 lm mesh, 5 lm mesh and Whatman GF/F glass-fibre filter (0.7 lm), following the methods in many marine studies (Rodriguez & Guerrero, 1994;Marañ ó n et al, 2001;Pesant et al, 2002). Chlorophyll a was also measured with one filtration on Whatman GF/F and compared with the sum of the three components of the fractionated biomass: the sum of the three fractionated components and the total biomass were not significantly different, so the proportion of biomass lost by the fractionation is considered negligible.…”

Section: Biological Parametersmentioning

confidence: 99%

Short‐term variability in physical forcing in temperate reservoirs: effects on phytoplankton dynamics and sedimentary fluxes

2006

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1. The effects of wind events on phytoplankton dynamics were investigated in two temperate reservoirs. 2. Meteorological forcing, change in physical and chemical structure of the water column and biological responses of phytoplankton communities were followed for 3 weeks in three seasons. 3. Depending on the season, the phytoplankton response differed in response to nutrient and light conditions, and to the intensity of stratification and mixing. 4. We demonstrated that, on a time scale of a few days, wind events can modify phytoplankton dynamics, in terms of size structure and exported biomass. An increase of mixing favoured the largest size class and disadvantaged the smallest size class, while an increase in stratification had the opposite effects. The short-term change in size structure was reflected in the sedimentary fluxes but with a time lag.

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“…Indeed, moderate turbulence favors the formation of algal aggregates, which sink much faster than single cells (Jackson 1990, Kiørboe et al 1998, though exceptions are reported (Kiørboe et al 1998). Pesant et al (2002) showed that wind-driven mixing in the upper water column of the Northeast Water polynya reduced the residence time of phytoplankton, thus favouring downward export. In the SETCOLs, algal aggregates were rare due to both the lack of turbulence and small sample volume.…”

Section: Downward Export Of Pocmentioning

confidence: 99%

Phytoplankton production in the North Water Polynya: size-fractions and carbon fluxes, April to July 1998

Mei¹,

Legendre²,

Gratton³

et al. 2003

Mar. Ecol. Prog. Ser.

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Wind-triggered events of phytoplankton downward flux in the Northeast Water Polynya

Cited by 20 publications

References 50 publications

Silica fluxes in the northeast Atlantic frontal zone of Mode Water formation (38°–45°N, 16°–22°W) in 2001–2002

Silica fluxes in the northeast Atlantic frontal zone of Mode Water formation (38°–45°N, 16°–22°W) in 2001–2002

Short‐term variability in physical forcing in temperate reservoirs: effects on phytoplankton dynamics and sedimentary fluxes

Phytoplankton production in the North Water Polynya: size-fractions and carbon fluxes, April to July 1998

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