Eddy induced coastal plankton community changes in a coupled numerical model of the Gulf of Lion (NW Mediterranean Sea)
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1 Eddy induced coastal plankton community changes in a coupled numerical model of the Gulf of Lion (NW Mediterranean Sea) Rose Campbell1,2, Frédéric Diaz1, ZiYuan Hu1, Andrea Doglioli1, Anne Petrenko1, and Ivan Dekeyser1 EGU General Assembly April 6th, 2011 Vienna (1) Aix-Marseille Université, CNRS, IRD, Laboratoire d Océanographie Physique et Biogéochimique, OSU/Centre d Océanologie de Marseille, Marseille, France (rose.campbell@univmed.fr) (2) ACRI-ST, 260 Route du Pin Montard, BP Sophia Antipolis, France
2 About eddies cyclonic eddy anticyclonic eddy How does an anticyclonic eddy modify the coastal planktonic ecosystem?
3 Study Zone: Gulf of Lion, NW Mediterranean Sea Gulf of Lion forcings Strong N & NW winds Rhone River plume Northern current Eddy study zone
4 Model properties: Symphonie Symphonie (Marsaleix et al 2008) 3D- primitive equation model 3 km resolution 40 sigma-z hybrid levels Open boundary conditions: OPA from MFSTEP Realistic river discharge rates for 6 rivers
5 Model properties: Eco3M Eco3M-NWMED (Baklouti et al 2006) Multi-nutrients Multi plankton functional types Non-redfieldian biomass C, N, P, Si, Chl OBC: BFM outputs 10-day average Realistic river inputs of NO3, PO4, NH4, and DOC
6 Previous work on anticyclones in Gulf of Lion Modelled relative vorticity Hu et al 2011 Millot (1982) suggested AC created by strong NW winds Hu et al (2011) studied AC eddies from : frequently present during stratified period alimented by strong winds
7 Anticyclonic eddy 2001 Temperature Beginning Middle End Warm-core eddy July 17th August 18th 2001 ~40km in diameter (elliptical) Hu et al 2011 C Wavelet analysis contour Used Symphonie model + wavelet analysis to study AC
8 SeaWiFS signature in total chlorophyll July 25th, 2001 July 30th, 2001 SeaWiFS mgchlm-3 Model
9 Vertical temperature patterns Deepening of warm surface waters Downwards vertical velocities Wind-driven upwelling, upwards vertical velocities to the north of the eddy S N
10 Nutrients horizontal and vertical Nitrate concentrations high near coast Upwelling area to the north low in nutrients Already taken up by phytoplankton What brings nitrate to the eastern edge? mmolnm-3
11 Nutrients : vertical view Nitrate: Middle date Upwards vertical velocities on edges of eddy mmolnm-3
12 Nutrients : vertical view Nitrate: Middle date Upwards vertical velocities on edges of eddy mmolnm-3
13 Response of phytoplankton Beginning Nanophytoplankton Middle End NE edge High Phyto Low Nutrient W edge Low Phyto High Nutrient Diatoms mmolcm days for nutrients to arrive in the North
14 Response of Zooplankton Beginning Middle End Coastal edge Low Zoo SE Edge High Zoo Meso Micro mmolcm-3 Grazing stops filament from completing a full rotation?
15 The story of this coastal AC eddy Strong NW wind
16 The story of this coastal AC eddy Strong NW wind Upwelling
17 The story of this coastal AC eddy Strong NW wind Upwelling Anticyclonic eddy in place
18 The story of this coastal AC eddy Strong NW wind Upwelling Anticyclonic eddy in place Nutrients driven up at the coast
19 The story of this coastal AC eddy Strong NW wind Upwelling Anticyclonic eddy in place Nutrients driven up at the coast Nutrients advected around the eddy
20 The story of this coastal AC eddy Strong NW wind Upwelling Anticyclonic eddy in place Nutrients driven up at the coast Nutrients advected around the eddy Phytoplankton development
21 The story of this coastal AC eddy Strong NW wind Upwelling Anticyclonic eddy in place Nutrients driven up at the coast Nutrients advected around the eddy Phytoplankton development
22 The story of this coastal AC eddy Strong NW wind Upwelling Anticyclonic eddy in place Nutrients driven up at the coast Nutrients advected around the eddy Phytoplankton development End of phytoplankton development
23 Conclusions & Next steps The anticyclonic eddy acts as a transporter of phytoplankton and nutrients The planktonic ecosystem is modified by the presence of the eddy (atypical diatom development in summer) Next steps : Nutrient pumping Advection Phytoplankton development Top-down and bottom-up control Study more eddies and generalize the mechanisms involved Increase horizontal model resolution to 1km Lagrangian Transport Experiment (LATEX) Nencioli this session poster, and session NP6.1 oral Friday 9:30 room 13 Petrenko session OS2.1poster Doglioli session OS2.1 poster
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