ADRHYPOX: Hypoxia and Benthic Pelagic coupling in the Adriatic Sea

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ADRHYPOX

Hypoxia and Benthic-Pelagic Coupling in the Adriatic Sea

Arthur Capet

OGS, Trieste, Italy

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What is hypoxia ?

Affects :

I Biogeochemical processes

I Biology (Lethal and non-lethal effects)

Hypoxic Events defined in terms of

I [O2]thresolds

I Temporal extent

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Why does hypoxia occurs?

1. Primary production

2. Benthic fluxes

3. Ventilation (before stratification)

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Why does hypoxia occurs?

2. Benthic fluxes

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Why does hypoxia occurs?

2. Benthic fluxes

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Why does hypoxia occurs?

2. Benthic fluxes

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Why does hypoxia occurs?

2. Benthic fluxes

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Why does hypoxia occurs?

2. Benthic fluxes

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Hypoxia in the Adriatic ?

We knows that

1. It happens in the Emilagna-Romana Coastal zone

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Hypoxia in the Adriatic ?

We knows that

1. It happens in the Emilagna-Romana Coastal zone

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Adrhypox

Needs a 3D model to :

I Complete missing observations

I Advice monitoring strategy

I Test scenario (Environmental management policies,

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Task 1: Diagenetic modelling

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Task 1: Diagenetic modelling

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Task 1: Diagenetic modelling

without bioirrigation ∂C ∂t =Ds ∂2C ∂z2 + X R with bioirrigation Enhanced Biodiffusion ∂C ∂t = βDs ∂2C ∂z2 + X R Non-local exchange ∂C ∂t =Ds ∂2C ∂z2 − α(C − C0) + X R

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Task 1: Diagenetic modelling

Non-local formalism

I Allows a better qualitative description of pore water profiles

I Allows a better quantitative description of multivariate

dynamics

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Task 1: Diagenetic modelling

Non-local formalism

dynamics

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Task 1: Diagenetic modelling

Non-local formalism

dynamics

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Coupled Model

I 0D water column (BFM) + Metamodelling

I Forced equilibrium by reinjecting denitrification loss

I Seasonal dynamics

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Coupled Model

I 0D water column (BFM) + Metamodelling

I Forced equilibrium by reinjecting denitrification loss

I Seasonal dynamics

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Next steps for this task

I More realistic setup

I Include phosphate dynamics in the Metamodelling

framework

I Compare with 1D diagenetic model

P budget − mmol/m2/d 0.19 6.7e−09 0.19 0.0013 0.11 0.081 0.13 0.007 0.0075 0.13 0.0064 0.00064 0.0075 4.1e−23 POP OP Burial PO4 w. irr. diff. PO4 Adsorp CaP CaP Bur FeP FeP Bur

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ADRHYPOX

Arthur Capet

OGS, Trieste, Italy

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Dissemination I

Publication

I In Prep.: “Bioirrigation in multivariate diagenetic models”

Collaborations

I NIOZ: the Royal Netherlands Institute for Sea Research

I May 2015 (one month) I December 2015 (short visit) I March-April 2015 (?)

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Dissemination II

Meetings

I 8th European Conference on Ecological Modelling

(October 2014, Marrakesh)

I The 2nd International Ocean Research Conference (IORC)

(November 2014, Barcelona),

I TURBINTERMARS 2015: International conference on

turbulence and interactions in marine systems (february, 2015, Trieste)

I AGU2016 (New Orleans, February 2016)

I EGU2016 (Vienna, April 2016):

Session on Benthic processe and Benthic-Pelagic coupling (OS3.3/BG3.9) Conveners: A. Capet (OGS), G. Lessin (PML), A. Dale (Geomar) & K. Soetaert (NIOZ)

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ADRHYPOX

Arthur Capet

OGS, Trieste, Italy

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Task 1: Diagenetic modelling

Resulting Flows Dominance of Anoxic Mineralization

Cbudget − mmol/m2/d 26 5.8 4 0.57 16 0.065 10 10 POC OC Burial DIC w. irr. diff. DIC Oxic Denitr Anox

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Task 1: Diagenetic modelling

Resulting Flows .. O budget − mmol O /m2/d 2.1 8.4 4 1.5 5 O2 w. irr. diff. O2

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Task 1: Diagenetic modelling

Resulting Flows .. N budget − mmol N /m2/d 2.3 6.7e−09 2.3 0.59 0.91 0.85 0.77 0.85 0.027 0.34 0.46 PON ON Burial NH3 irrig. NH3 diff. NH3 Adsorp

NO3 irrig. NO3 diff.

NO3

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Task 1: Diagenetic modelling

Resulting Flows .. P budget − mmol/m2/d 0.19 6.7e−09 0.19 0.0013 0.11 0.081 0.13 0.007 0.0075 0.13 0.0064 0.00064 0.0075 4.1e−23 POP OP Burial PO4 w. irr. diff. PO4 Adsorp CaP CaP Bur FeP FeP Bur