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Biogeosciences An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/bg-2020-34
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-2020-34
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  27 Feb 2020

27 Feb 2020

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A revised version of this preprint was accepted for the journal BG and is expected to appear here in due course.

Characterisation of extreme events waves in marine ecosystems: the case of Mediterranean Sea

Valeria Di Biagio, Gianpiero Cossarini, Stefano Salon, and Cosimo Solidoro Valeria Di Biagio et al.
  • Department of Oceanography, Istituto Nazionale di Oceanografia e di Geofisica Sperimentale OGS, Sgonico (TS), 34010

Abstract. We propose a new method to identify and characterise the occurrence of prolonged extreme events in marine ecosystems on the basin scale. There is a growing interest about events that can affect ecosystem functions and services in a changing climate. Our method identifies extreme events as peak occurrences over 99th percentile thresholds computed from local time series and defines an Extreme Events Wave (EEW) as a connected region including these events. The EEWs are characterised by a set of novel indexes, referred to initiation, extent, duration and strength. The indexes, associated to the areas covered by each EEW, are then statistically analysed to highlight the main features of the EEWs on the considered domain. We applied the method to the winter-spring daily chlorophyll field of a validated multidecadal hindcast provided by a coupled hydrodynamic-biogeochemical model of the Mediterranean open-sea ecosystem, with 1/12° horizontal resolution. This allowed to identify the maxima of chlorophyll as exceptionally high and prolonged blooms and to characterise their phenomenology in the period 1994–2012. A fuzzy k-means cluster analysis on the EEWs indexes provided a bio-regionalisation of the Mediterranean Sea associated to the occurrence of chlorophyll EEWs with different regimes.

Valeria Di Biagio et al.

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Valeria Di Biagio et al.

Valeria Di Biagio et al.

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Latest update: 23 Nov 2020
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Short summary
Events that can influence the functioning of the earth's ecosystems arouse a growing interest in a changing climate. We propose a method to identify and characterise waves of extreme events affecting marine ecosystems for multi-week periods over wide areas. Our method can be applied to suitable ecosystem variables, and has been used to describe different kinds of Mediterranean phytoplankton blooms through the analysis of the chlorophyll output from a high-resolution model.
Events that can influence the functioning of the earth's ecosystems arouse a growing interest in...
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