The reykjanes ridge experiment and ovide plans
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The Reykjanes Ridge experiment and OVIDE plans. V. Thierry H. Mercier, P. Lherminier , B. Ferron , N. Daniault and the RREX and OVIDE groups LPO, Brest (France), CNRS/IFREMER/IRD/UBO LOCEAN, Paris (France), CNRS/UPMC IIM, Vigo (Spain). The OVIDE project. Objectives

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The reykjanes ridge experiment and ovide plans

The Reykjanes Ridge experiment and OVIDE plans

V. Thierry

H. Mercier, P. Lherminier, B. Ferron, N. Daniault and the RREX and OVIDE groups

LPO, Brest (France), CNRS/IFREMER/IRD/UBO

LOCEAN, Paris (France), CNRS/UPMC

IIM, Vigo (Spain)


The ovide project
The OVIDE project

  • Objectives

  • Quantify and understand the MOC variability

  • Understand storage mechanisms of anthropogenic CO2 in the Atlantic Ocean

  • Quantify and understand water mass properties variability

  • Means

  • Hydrographic section (2002, 04, 06, 08, 10, 12 + Fourex 1997)

  • Current meters, Argo, Altimetry

  • Modeling, data assimilation

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Partners: LPO, IIM Vigo, S.B. Roscoff, LOCEAN

Contribution to CLIVAR, IOCCP, Argo

Funding: Ifremer, INSU, CSIC, CNES, Météo-France, LEFE, CarboChange

Collaborations : SIO, WHOI, DFO, NOCS



Quantify and understand the moc variability1
Quantify and understand the MOC variability

Red points: MOC from OVIDE and FOUREX hydrographic data

Blue line: upper limb of the MOC computed from Altimetry

Black lines: upper limb of the MOC computed from Altimetry + Argo or WOA

Mercier et al 2013, Prog. Oceanogr.


Variability of egic transport 2005 2006
Variability of EGIC transport: 2005-2006

Daniault et al, 2010, JPO


Variability of egic transport 1993 2010
Variability of EGIC transport: 1993-2010

Daniault et al, 2011, GRL


Understand storage mechanisms of anthropogenic co2 in the atlantic ocean
Understand storage mechanisms of anthropogenic CO2 in the Atlantic Ocean

Perez et al, 2010, Biogeosciences


Understand storage mechanisms of anthropogenic co2 in the atlantic ocean1
Understand storage mechanisms of anthropogenic CO2 in the Atlantic Ocean

Perez et al, 2013, Nature Geosciences


Reykjanes ridge mode water variability
Reykjanes Ridge Mode Water variability Atlantic Ocean

PSAL

SIG0

TPOT

Thierry et al 2008, JGR, de Boissséson et al, 2012, JGR


Conclusions
Conclusions Atlantic Ocean

  • Climate relevant indexes of the North-Atlantic Ocean variability are monitored: MOC, water mass properties, CO2 storage

  • Data from sustained observing systems (altimetry, Argo) have been used to compute proxies of those indexes

    • to extend the time series backward in time

    • to interpolate in between the hydrographic sections

    • to resolve time-scales that are not resolved by the hydrographic data (seasonal)

  • Hydrographic cruises remain mandatory

    • to acquire data that are not accessible by sustained observing systems and autonomous platform (pH, CO2, deep limb of the MOC, CO2 storage)

    • to resolve small spatial scales that are not resolved by sustained observing systems

    • to define and validate proxies (and the associated hypothesis) of the indexes

    • to calibrate Argo data


Ovide plans
OVIDE plans Atlantic Ocean

High-frequency hydrographic data are required to capture interannual variability and long-term trends in the highly variable North-Atlantic Ocean

  • Continue the OVIDE time series on a 2 year basis :

  • GEOVIDE in 2014: funded (GEOTRACES + OVIDE)

  • OVIDE in 2016

    • Ship time under IIM Vigo responsibility (BOCATS project)

    • Expected funding: Spain, France, Europe

  • OVIDE 2018

    • Ship time under LPO/France responsibility

    • Expected funding: France, Spain, Europe


  • The reykjanes ridge experiment

    A process study to understand the role of the Reykjanes Ridge on the large scale circulation, water mass transformation and ultimately on the MOC

    The Reykjanes Ridge Experiment

    • Reykjanes Ridge is localized in a strategic place for the MOC

    • The flow along and above the ridge is poorly understood and its representation in ocean models is flawed.


    The reykjanes ridge experiment and ovide plans
    Objective 1: Document Ridge on the large scale circulation, water mass transformation and ultimately on the MOCand understand how does the Reykjanes Ridge control the large-scale circulation

    Summer mean 2002-2010 velocity across the Ovide section and salinity along the section

    • What are the dynamical flow regimes that prevail on the two sides of the ridge ?

    • How the RRMW and ISOW are transferred toward the Irminger Sea ?


    The reykjanes ridge experiment and ovide plans
    Objective 2: Document and understand how does the Reykjanes Ridge influence, through turbulent mixing, water mass transformation

    • Turbulent kinetic energy dissipation is enhanced nearby the Reykjanes Ridge: near the bottom and at the base of the mode water layer.

    • We want to quantify the spatio-temporal varaibility of the mixing around the ridge and its influence on the currents and water-masses.


    The reykjanes ridge experiment and ovide plans

    Objective 3: Identify and quantify the key ocean model parameters involved in the representation of the dynamics of the flows around the Reykjanes Ridge

    • Ocean models show large discrepancies in the representation of the flow and water mass properties in the subpolar gyre of the North Atlantic

    • Part of the deficiencies comes from errors in the representation of the dynamics of the flows around the Reykjanes Ridge


    The reykjanes ridge experiment rrex
    The Reykjanes Ridge Experiment (RREX) parameters involved in the representation of the dynamics of the flows around the Reykjanes Ridge

    Idealized experiment + new and existing datasets + realistic simulations understand mechanisms at play in the vicinity of the RR and incorporate them appropriately in large-scale models

    • Hydrographicsurvey :

    • 113 CTD-O2-ADCP casts

    • Water sample: S, O2 and nutrients

    • Mixing measurement (VMP profile) every other CTD casts

    • Argo floatsdeployment

    • Duringcruise

    • Every 3 monthsowing to the ASFAR device

    • Currentmetermeasurements


    The reykjanes ridge experiment rrex1
    The Reykjanes Ridge Experiment (RREX) parameters involved in the representation of the dynamics of the flows around the Reykjanes Ridge

    Idealized experiment + new dataset + realistic simulations understand mechanisms at play in the vicinity of the RR and incorporate them appropriately in larg-scale models

    • Hydrographicsurvey :

    • 113 CTD-O2-ADCP casts

    • Water sample: S, O2 and nutrients

    • Mixing measurement (VMP profile) every other CTD casts

    • Argo floatsdeployment

    • Duringcruise

    • Every 3 monthsowing to the ASFAR device

    • Currentmetermeasurements


    The reykjanes ridge experiment rrex2
    The Reykjanes Ridge Experiment (RREX) parameters involved in the representation of the dynamics of the flows around the Reykjanes Ridge

    Idealized experiment + new dataset + realistic simulations understand mechanisms at play in the vicinity of the RR and incorporate them appropriately in larg-scale models

    • Hydrographicsurvey :

    • 113 CTD-O2-ADCP casts

    • Water sample: S, O2 and nutrients

    • Mixing measurement (VMP profile) every other CTD casts

    • Argo floatsdeployment

    • Duringcruise

    • Every 3 monthsowing to the ASFAR device

    • Currentmetermeasurements


    Asfar autonomous system for argo floats release
    ASFAR parameters involved in the representation of the dynamics of the flows around the Reykjanes Ridge Autonomous System for Argo floats Release


    The reykjanes ridge experiment rrex3
    The Reykjanes Ridge Experiment (RREX) parameters involved in the representation of the dynamics of the flows around the Reykjanes Ridge

    Idealized experiment + new dataset + realistic simulations understand mechanisms at play in the vicinity of the RR and incorporate them appropriately in larg-scale models

    • Hydrographicsurvey :

    • 113 CTD-O2-ADCP casts

    • Water sample: S, O2 and nutrients

    • Mixing measurement (VMP profile) every other CTD casts

    • Argo floatsdeployment

    • Duringcruise

    • Every 3 monthsowing to the ASFAR device

    • Currentmetermeasurements


    The rrex moorings
    The RREX moorings parameters involved in the representation of the dynamics of the flows around the Reykjanes Ridge


    The rrex planning funding and collaborations
    The RREX planning, funding and collaborations parameters involved in the representation of the dynamics of the flows around the Reykjanes Ridge

    • RREX Planning

      • Summer 2015: Hydrographic survey and mooring deployment for 2 year

      • Summer 2016: Refill the 2 ASFAR

      • Summer 2017: Moorings recovery and 2nd realization of the survey

    • Funding: France, Spain, Europe

      • Ship time: priority 1 afterevaluation

      • Part of the fundingalreadyacquired (easternmoorings, hydrographiccruise)

      • Needfunding for western moorings and to maintainmoorings longer than 2 years

    • Partners: LPO, LOCEAN, LEGI, IIM Vigo

    • Collaborations : SIO Moscow, OSNAP partners


    Osnap vs rrex moorings
    OSNAP vs. RREX moorings parameters involved in the representation of the dynamics of the flows around the Reykjanes Ridge


    Argo floats and argo floats with oxygen sensor
    Argo floats and Argo floats with oxygen sensor parameters involved in the representation of the dynamics of the flows around the Reykjanes Ridge

    • Use ASFAR system (bottom or mooring) to deploy Argo floats on a regular basis in North-Atlantic

    • We aim at developing and sustaining a global Argo-O2 array to monitor changes in O2 content

      • Pilot experiment in the North-Atlantic

      • Monitor deep convection

      • Follow ventilation pathways of water masses

      • Follow OMZ

      • Biogeochemical studies

    • 12 deep Argo floats (0-4000m) with 02 sensors will have to be deployed in 2015 and 2016

    Argo profiles with O2 sensor

    • We will look for ship of opportunity with O2 measurements to deploy some of those floats in the North-Atlantic and to validate the data


    The reykjanes ridge experiment and ovide plans

    Thank you parameters involved in the representation of the dynamics of the flows around the Reykjanes Ridge


    The reykjanes ridge experiment and ovide plans

    The RREX moorings parameters involved in the representation of the dynamics of the flows around the Reykjanes Ridge

    Kinetic energy dissipation along Ovide section


    The rrex moorings1
    The RREX moorings parameters involved in the representation of the dynamics of the flows around the Reykjanes Ridge


    Deep arvor 6901468
    Deep-Arvor 6901468 parameters involved in the representation of the dynamics of the flows around the Reykjanes Ridge

    DOXY_ADJUSTED = 1.003*DOXY + 41.3