Eddies: Fluid Dynamical Niches or Transporters?–A Case Study in the Western Baltic Sea

Vortmeyer-Kley, Rahel; Lünsmann, Benedict; Berthold, Maximilian; Gräwe, Ulf; Feudel, Ulrike

doi:10.3389/fmars.2019.00118

Cited by 9 publications

(8 citation statements)

References 72 publications

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“…We analyzed eight Baltic eddies in total. The results are used in a study of plankton population dynamics in coherent eddy cores 39 to guarantee a common history of water parcels.…”

Section: Discussionmentioning

confidence: 99%

“…The velocity fields are part of a multidecadal simulation and cover the timespan March 2010 to October 2010. The temporal resolution of the velocity fields is 1 h. More details of the coupled setup of GETM can be found in 25,39 where the data set was originally used.…”

Section: Baltic Seamentioning

confidence: 99%

“…We use a Lagrangian descriptor, the MV-tool 25 , to identify all eddies with a lifetime longer than 100 h that travel more than 8 km (see 39 for details). From this eddy data set, we select eight test eddies by hand for detailed analysis.…”

Section: Baltic Seamentioning

confidence: 99%

“…The presented approach is successfully applied in 39 to facilitate the study of plankton population dynamics in coherent water masses in the Baltic Sea. There, the identification of coherent sets directly follows ideas of this article (see Sec.…”

Section: Introductionmentioning

confidence: 99%

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An extended transfer operator approach for time-consistent coherent set analysis

Lünsmann,

Vortmeyer-Kley,

Kantz

2019

Preprint

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Coherent oceanic mesoscale structures, especially the non-filamenting cores of oceanic eddies, have gained a lot of attention in recent years. These Lagrangian structures are considered to play a significant role in oceanic transport processes which, in turn, impact marine life, weather and potentially even the climate itself. Answering questions regarding these phenomena requires robust tools for the detection and identification of these structures. In this article, we use transfer operator ideas to develop a novel method for the identification of weakly-mixing coherent volumes in oceanic velocity field data sets. Unlike other methods, the approach focuses on maximizing consistency over longer time periods. We employ a time-centralized transfer operator approach with practical modifications to identify potential structures in predetermined domains and couple adjacent time steps to decide how to conduct the final partitioning. The analysis pipeline includes plausibility checks that give further insights into the stability and coherence of the inferred structure. The presented method is able to find changing masses of maximal coherence in stationary and non-stationary toy models and yields good results when applied to field data.

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“…We analyzed eight Baltic eddies in total. The results are used in a study of plankton population dynamics in coherent eddy cores 39 to guarantee a common history of water parcels.…”

Section: Discussionmentioning

confidence: 99%

Section: Baltic Seamentioning

confidence: 99%

Section: Baltic Seamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An extended transfer operator approach for time-consistent coherent set analysis

Lünsmann,

Vortmeyer-Kley,

Kantz

2019

Preprint

Self Cite

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“…Thus, nekton must migrate between patches to feed, which are continually and unpredictably dispersed, meaning they have resource encounter rates that typically cannot be bettered using local information 17 . Nekton live at a scale where the foraging landscape is highly fragmented and disordered due to these physical processes, and operate on biological timescales which are significantly longer than eddy lifespans 16,18 . As they are trophically linked to the plankton, they must actively work to overcome the dispersal, ultimately increasing their locomotory costs, which also grow with prey size 19 .…”

Section: Main Textmentioning

confidence: 99%

Synergetic impacts of turbulence and fishing reduce ocean biomass

McKerral

Seymour

Lavery

et al. 2021

Preprint

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A universal scaling relationship exists between organism abundance and body size1,2. Within ocean habitats this relationship deviates from that generally observed in terrestrial systems2-4, where marine macro-fauna display steeper size-abundance scaling than expected. This is indicative of a fundamental shift in food-web organization, yet a conclusive mechanism for this pattern has remained elusive. We demonstrate that while fishing has partially contributed to the reduced abundance of larger organisms, a larger effect comes from ocean turbulence: the energetic cost of movement within a turbulent environment induces additional biomass losses among the nekton. These results identify turbulence as a novel mechanism governing the marine size-abundance distribution, highlighting the complex interplay of biophysical forces that must be considered alongside anthropogenic impacts in processes governing marine ecosystems.

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Comparing Eulerian and Lagrangian eddy census for a tide-less, semi-enclosed basin, the Baltic Sea

et al. 2019

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Eddies: Fluid Dynamical Niches or Transporters?–A Case Study in the Western Baltic Sea

Cited by 9 publications

References 72 publications

An extended transfer operator approach for time-consistent coherent set analysis

An extended transfer operator approach for time-consistent coherent set analysis

Synergetic impacts of turbulence and fishing reduce ocean biomass

Comparing Eulerian and Lagrangian eddy census for a tide-less, semi-enclosed basin, the Baltic Sea

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