OSSE and Bio-Argo

North Atlantic Sub-polar Gyre

South Atlantic sub-tropical Gyre

Questions to be addressed

Existing data

Future deployment plans

Bio-Argo Floats

Measurements

o PAR, Ed(380), Ed(412), Ed(490)

o bbp(700): POC proxy

o Chla fluorescence: Chla concentration proxy

o O2

o NO3o pH, pCO2, passive acoustic, video

Missions

o Temporal resolution configurable: from diel

cycle to Argo 10 day cycling mode: adaptative

sampling strategy

o Vertical configuration configurable: up to 0.1m

resolution

Sub-polar gyre

• ~3000 profiles over the last 2.5

years

• 7 new floats recently deployed by

US colleagues

• NO3 not well resolved

http://remocean.eu

Sub-polar gyre

Magnitude of the CO2 sink of biologicalorigin

– Phytoplankton bloom• Timing

• magnitude

• main phytoplankton groups involved (?)

– Export• « Classical » export: sinking of particulate material

when bloom collapses. Sinking rate vsremineralisation rates

03/01/2016Name of the meeetingLacour et al., GRL, 2015

Bloom Timing and magnitude in the Labrador

Sea: climatological / bioregionalisation

approach

Sequence of bloom export : one

example in the Labrador Sea

~ 30 time series like

this (but with

nuances…) over

the last two years

03/01/2016Name of the meeeting

The importance of meso-and sub-

mesoscale in production and export

Some exemples of

« unclassical way » of

particulate matter export

Sub-polar gyre

Magnitude of the CO2 sink of biological origin

– Phytoplankton bloom• Timing

• magnitude

• main phytoplankton groups involved (?)

– Export• « Classical » export: sinking of particulate material

when bloom collapses. Sinking rate vs remineralisationrates

• Mixed-layer pump (when re-stratification occurs)

• Eddy-driven pump

• => small-scale regions of intense carbon export?

Sub-tropical gyre

• ~400 profiles over the

last 2.5 years

• NO3 /O2 well resolved

Sub-tropical gyre

Balance between oxygen production and

respiration (Net community production):

– From O2 floats time series in North and South

Pacific subtropical Gyre, NCP > 0

• To be adressed in the South Atlantic

– Combined role of nitracline location / avialable

irradiance in driving production at the level of

the Deep Chlorophyll Maximum (DCM): a

seasonal problem.

From Mignot et al, Global Biogeochemical Cycles 2014

Sub-tropical gyre

Example of (on-going) time serie in the

South Atlantic subtropical gyre

Name of the meeeting

T S s

Chla bbp/POC

O2 NO3

Ed380 Ed412 Ed490 PAR

CDOM

AtlantOs Bio-Argo deployment plan

• 7 Bio-Argo floats: where?

– PAR, Ed(380), Ed(412), Ed(490)

– bbp(700): POC proxy

– Chla fluorescence: Chla concentration proxy

– O2

– NO3

• 7 deep O2-Argo : where?

Planning a global BioGeoChemical-Argo network

Villefranche-sur-mer, January 11-13, 2016

• Science questions

• Sizing the array

– OSSE

– Regionalization approach