Preprints
https://doi.org/10.5194/bg-2021-97
https://doi.org/10.5194/bg-2021-97

  26 Apr 2021

26 Apr 2021

Review status: this preprint is currently under review for the journal BG.

Deep chlorophyll maximum and nutricline in the Mediterranean Sea: emerging properties from a multi-platform assimilated biogeochemical model experiment

Anna Teruzzi, Giorgio Bolzon, Laura Feudale, and Gianpiero Cossarini Anna Teruzzi et al.
  • Istituto Nazionale di Oceanografia e di Geofisica Sperimentale - OGS, Trieste, 34100, Italy

Abstract. Data assimilation has had a positive impact on biogeochemical modelling in a number of oceanographic applications. The recent operational availability of data from BGC-Argo floats, which provide valuable insights into key vertical biogeochemical processes, can lead to further improvements in 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 one-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 and semi-independent (before 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 and intensity and nutricline depth. The outcomes of the model simulation assimilating both satellite data and BGC-Argo data have been used to explore 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.

Anna Teruzzi et al.

Status: open (until 11 Jun 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Anna Teruzzi et al.

Anna Teruzzi et al.

Viewed

Total article views: 226 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
177 45 4 226 1 1
  • HTML: 177
  • PDF: 45
  • XML: 4
  • Total: 226
  • BibTeX: 1
  • EndNote: 1
Views and downloads (calculated since 26 Apr 2021)
Cumulative views and downloads (calculated since 26 Apr 2021)

Viewed (geographical distribution)

Total article views: 216 (including HTML, PDF, and XML) Thereof 216 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 16 May 2021
Download
Short summary
During summer, maxima of phytoplankton chlorophyll concentration (DCM) occur in the subsurface of the Mediterranean Sea, and can play a relevant role in carbon sequestration into the ocean interior. A numerical model based on in situ and satellite observations provides insights on the wide range of DCM conditions across the relatively small Mediterranean Sea, and shows a western DCM that is 25 % shallower and with higher phytoplankton chlorophyll concentration than in the eastern Mediterranean.
Altmetrics