Eddy formation on the coast of North Norway – evidenced by synoptic sampling

Pedersen, Ole‐Petter; Zhou, Meng; Tande, Kurt S.; Edvardsen, Are

doi:10.1016/j.icesjms.2005.01.017

Cited by 23 publications

(30 citation statements)

References 21 publications

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“…Fig. 6) Pedersen et al (2005) calculated the relative geostrophical current for the study area (based on den- sity measurements from the CTD on the SCANFISH, see their paper for more details). Their results show the presence of several mesoscale eddies.…”

Section: Zooplankton Size Spectra (Fig 5)mentioning

confidence: 99%

“…The hydrodynamic conditions are described by Pedersen et al (2005), whose study revealed non-linear mesoscale eddies translating eastward, following the shelf break. Anti-cyclonic eddies contained coastal water, while cyclonic eddies contained oceanic water.…”

Section: Eddiesmentioning

confidence: 99%

“…Meanders and eddies also exist in our study area. Although the most significant eddy transport follows the shelf, it is also clear that mesoscale eddies are translated on-shelf (Pedersen et al 2005). The intrusion of eddies of oceanic water and plankton (both meso-and protozoan) onto the shelf may increase the temperature, provide food for fish larvae and seed the shelf water, before being eroded.…”

Section: Importance Of Eddies For Capelin Recruitmentmentioning

confidence: 99%

“…The southern Barents Sea is dominated by interactions of 2 waters: coastal water and Atlantic water (Loeng 1991), and the mixing of these 2 waters prevails in the hatching and nursery areas of capelin larvae. Mesoscale hydrographical features such as fronts and eddies dominate in this area (Pedersen et al 2005), and may affect larval survival and subsequently recruitment. After hatching, the fish larvae are transported offshelf towards nurseries in the central part of the Barents Sea, and few larvae remain in the coastal area after 2 wk (Gjøsaeter 1998.…”

Section: Spawning Sites Of Capelin Mallotus Villosusmentioning

confidence: 99%

“…There were only a few net tows covering a very limited area, which may well have missed dense capelin larvae patches, whereas the towed SCANFISH-OPC measurements covered a much larger area, and provided more accurate estimates of their distribution. Since this area is highly dynamic, with coastal jets and translating eddies (Pedersen et al 2005), the water mass can be replaced in certain areas within a few days. However, it is likely that larvae were continuously hatching in the area throughout the whole sampling period in May.…”

mentioning

confidence: 99%

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Interactions between biological and environmental structures along the coast of northern Norway

Fossheim¹,

Zhou²,

Tande³

et al. 2005

Mar. Ecol. Prog. Ser.

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Spatial and temporal variability in physical conditions off the northern coast of Norway may affect the 3D distribution of mesozooplankton and capelin larvae (Mallotus villosus Müller) during the early capelin recruitment period. To monitor distribution patterns, we sampled the water masses down to 100 m on 3 successive occasions in May 2001 with a SCANFISH-OPC-CTD-F platform. We found distinct differences between coastal and oceanic waters in the study area. The water masses were most clearly distinguished by salinity and there was a tendency for higher zooplankton abundance and biomass in water of oceanic origin. Our study area was characterised by mesoscale eddies, translating in an easterly direction which follow the Norwegian Coastal Current. Cyclonic eddies contained oceanic water, high zooplankton abundance and biomass, whereas anti-cyclonic eddies contained water masses of coastal origin and low abundance of zooplankton. The eddies found in the spawning and hatching habitat of capelin were relatively small and of short duration; however, their impact on the biological community in terms of mediating exchange of biotas across the shelf can be significant. KEY WORDS: Optical plankton counter · Eddy · Barents Sea · Capelin larvae Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 300: [147][148][149][150][151][152][153][154][155][156][157][158] 2005 (Lobel & Robinson 1986, Boehlert et al. 1992, Bograd et al. 1994, Rodriguez et al. 2001, Halvorsen et al. 2003 and affect the biological productivity of coastal regions (Rey 1981, Kimura et al. 1997, Kasai et al. 2002). An eddy can concentrate buoyant passive materials when its secondary circulation converges. This mechanism may aggregate patches of plankton in confined areas and may provide favourable retention areas (Halvorsen et al. 2003). A divergent eddy on the other hand may increase primary production due to the upwelling of nutrient-rich deep water to the euphotic surface layer, which may further enhance zooplankton production (Kimura et al. 1997, Nakata et al. 2000.Abundant fish larvae have previously been observed in both cyclonic and anti-cyclonic (Schumacher et al. 1993) eddies. Canino et al. (1991) suggested that feeding and survival conditions may be better in eddies. Bograd et al. (1994) found that larvae retained within an eddy had a lower mortality rate than elsewhere. It has also been hypothesised that retention in eddies, that move downstream at slower rates than mean currents (Bograd et al. 1994), aid in delivering larvae to the nurseries. Eddies may aid in retention of fish larvae in coastal areas (Kasai et al. 2002) and may decrease the likelihood of them being transported into the oceanic regime (Bograd et al. 1994), or may function as a transport mechanism from coastal areas to offshore nursery grounds (Komatsu et al. 2002). Eddies are also important for larvae in helping them to avoid excessive transport (i.e. currents may carry them away from the nurseries) by retaining them in ...

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Section: Zooplankton Size Spectra (Fig 5)mentioning

confidence: 99%

Section: Eddiesmentioning

confidence: 99%

Section: Importance Of Eddies For Capelin Recruitmentmentioning

confidence: 99%

Section: Spawning Sites Of Capelin Mallotus Villosusmentioning

confidence: 99%

mentioning

confidence: 99%

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Interactions between biological and environmental structures along the coast of northern Norway

Fossheim¹,

Zhou²,

Tande³

et al. 2005

Mar. Ecol. Prog. Ser.

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Spring Phytoplankton Distributions and Primary Productivity in Waters off Northern Norway

Smith

Meng

Basedow³

2022

Preprint

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Phytoplankton distributions and primary productivity were assessed off the northern coast of Norway in spring. Biomass and productivity were greatest off the continental shelf during the period of observations. * A satellite climatology showed that blooms usually form on the continental shelf first, and spread to deeper waters from 2-4 weeks after the shelf bloom. * The Calanus finmarchicus population had the potential for removing substantial amounts of chlorophyll each day, but phytoplankton vertical distributions were controlled by passive sinking.

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Long‐term variability in overwintering copepod populations in the Lofoten Basin: The role of the North Atlantic oscillation and trophic effects

Weidberg

Basedow

2019

Limnology & Oceanography

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Critical gaps in knowledge hinder our ability to infer spatiotemporal dynamics in pelagic ecosystems. In particular, environmental changes affecting key copepod species while overwintering in deep waters are still not well understood. Here, we analyzed an 11 yr time series (2000–2010) of winter (January/February) samplings in the Lofoten Basin to characterize the spatial distribution of Calanus finmarchicus overwintering abundances and to infer their long‐term temporal trends. The spatial structure of populations at depths between 700 and 900 m corresponded to mesoscale aggregations consistent with eddies in the region. Over time, increased abundances of copepods and of one of its main predators, the herring (Clupea harengus), matched a negative trend in the 7 yr lagged winter NAO index. However, this progressive climatic shift did not affect surface conditions in the region or southward but corresponded to an increase in salinity and a deepening of the vertical extension of the Atlantic Water layer. We hypothesized that this change in salinity structure across the water column increased the density contrast between copepods and ambient water masses and facilitates the ascent rates during seasonal vertical migration. We suggest a step‐wise mechanism from NAO large‐scale forcing to copepod and herring populations mediated by hydrographical changes in intermediate water masses to explain the observed trends in abundances. Thus, large‐scale, lagged climatic patterns affecting overwintering copepods might scale up to succesive trophic levels in the pelagic ecosystem.

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Eddy formation on the coast of North Norway – evidenced by synoptic sampling

Cited by 23 publications

References 21 publications

Interactions between biological and environmental structures along the coast of northern Norway

Interactions between biological and environmental structures along the coast of northern Norway

Spring Phytoplankton Distributions and Primary Productivity in Waters off Northern Norway

Long‐term variability in overwintering copepod populations in the Lofoten Basin: The role of the North Atlantic oscillation and trophic effects

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