Deep chlorophyll maximum and nutricline in the Mediterranean Sea: emerging properties from a multi-platform assimilated biogeochemical model experiment
<p>Data assimilation has led to advancements in biogeochemical modelling and scientific understanding of the ocean. The recent operational availability of data from BGC-Argo (biogeochemical Argo) floats, which provide valuable insights into key vertical biogeochemical processes, stands to furt...
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| Autores principales: | , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
Copernicus Publications
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/c088f233659d46c19c78d201ea82138d |
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| Sumario: | <p>Data assimilation has led to advancements in
biogeochemical modelling and scientific understanding of the ocean. The
recent operational availability of data from BGC-Argo (biogeochemical Argo) floats, which provide
valuable insights into key vertical biogeochemical processes, stands to
further improve biogeochemical modelling through assimilation schemes that
include float observations in addition to traditionally assimilated
satellite data. In the present work, we demonstrate the feasibility of joint
multi-platform assimilation in realistic biogeochemical applications by
presenting the results of 1-year simulations of Mediterranean Sea
biogeochemistry. Different combinations of satellite chlorophyll data and
BGC-Argo nitrate and chlorophyll data have been tested, and validation with
respect to available independent non-assimilated and assimilated (before the
assimilation) observations showed that assimilation of both satellite and
float observations outperformed the assimilation of platforms considered
individually. Moreover, the assimilation of BGC-Argo data impacted the
vertical structure of nutrients and phytoplankton in terms of deep
chlorophyll maximum depth, intensity, and nutricline depth. The outcomes of
the model simulation assimilating both satellite data and BGC-Argo data
provide a consistent picture of the basin-wide differences in vertical
features associated with summer stratified conditions, describing a
relatively high variability between the western and eastern Mediterranean,
with thinner and shallower but intense deep chlorophyll maxima associated
with steeper and narrower nutriclines in the western Mediterranean.</p> |
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