Annual Meeting 25-27 Nov 2008 Accra, Ghana LAMTO, Ivory Coast (6°13'N / 5°01'W) Monitoring...

Annual MeetingAnnual Meeting25-27 Nov 200825-27 Nov 2008

Accra, GhanaAccra, Ghana

LAMTO, LAMTO, Ivory Coast Ivory Coast ((6°13'N / 5°01'W6°13'N / 5°01'W))

Monitoring Atmospheric COMonitoring Atmospheric CO22 and CH and CH44

concentrations in Western Africaconcentrations in Western Africa

M.Ramonet, B.Wastine, C.Kaiser, C.Vuillemin, LSCE, Gif sur Yvette

A.Diawara, P.Yao, D.Bethuel, Univ. de Cocody, Abidjan



One atmospheric site:One atmospheric site:global carbon budgetglobal carbon budget

Keeling et al.

From one background atmospheric site we know the CO2 accumulation in the atmosphere, from which we can deduced precisely the global carbon sink and its variability.



Large scaleLarge scaleSpatial distributionSpatial distribution

Reduction of the C sink at mid north latitude and of the tropical C source

New observation data (aircraft)

4

3

2

1

0

-1

-2

-3

-4

Gurney et al.2004

Stephens et al.2007

GtC

/yea

r

Tropics

Mid North

Sin

k?

?

So

urce

4

3

2

1

0

-1

-2

-3

-4

Gurney et al.2004

Stephens et al.2007

GtC

/yea

r

Tropics

Mid North

Sin

k?

?

So

urce



Continental/Regional inversionsContinental/Regional inversions



CARBON PORTAL

Comparison of three different inversions:

LSCE (v2.0): Peylin et al.

JENA (S96): Roedenbeck et al.

Carbon Tracker (EU): Wouters et al.

AtmosphericAtmosphericinversionsinversions

1.04 0.59 0.63 GtC/yr

20032003

LSCE_V2.0 JENA_S96Carbon Tracker EU

Poussi , Peylin et al., ICOS Carbon Portal



AtmosphericAtmosphericinversionsinversions

Fossil emission

Fire emission

Biosphere (inversion)

Total flux

GtC

/Yr

LSCE

JENA

CTrackerLSCEJENA

CTracker

Poussi , Peylin et al., ICOS Carbon Portal



To fill in the observational gap in To fill in the observational gap in AfricaAfrica

AscensionAscension

LamtoLamto

Mt KenyaMt Kenya

AssekremAssekrem

LampedusaLampedusa

TenerifeTenerife

Hombori

NegevNegev

FinokaliaFinokalia



LAMTO LAMTO stationstation

Primary station of

• CTBT network seismic and infrasound)

• IDAF network (wet and dry deposition fluxes)

• Biomass burning campaigns

Run from University of Cocody, Abidjan

Staff ~14 people



North viewNorth view

From the 50m high From the 50m high towertower

South viewSouth view



Local challengesLocal challenges

• High temperature

• High humidity

• High content in aerosols



Inlet Pump & filters Calibration Air distribution

Air distributionComputerPicarro CRDSPicarro pumpUPS (20min autonomy)

The parts of the analyzerThe parts of the analyzer

No drying



Schematic view of the Schematic view of the installationinstallation



Calibration Calibration protocolprotocol



Calibrations driftCalibrations drift

CO2 ~ 0.01 ppm / week

CH4 ~ 0.20 ppb / week

1 calibration / monthWMO recommendation for precision:

CO2: ±0.1ppm

CH4: ±2 ppb



Picarro ComPicarro Com

Prototype for the future European network ?



First First measurementsmeasurements



CHCH44 peaks peaks



Model Model validationvalidation



Analyzer CO2/CH4/H2O

Analyzer ESP running since Aug. 29th

Monthly calibration should be enough

CO2: Strong diurnal CO2 cycle (30-50 ppm)

CH4: Synoptic events (50-80 ppb)

70 ppb increase in November

Fire season just starting

Let's challenge the models...

Preliminary Preliminary conclusionsconclusions





Thanks for your attention.

Annual Meeting 25-27 Nov 2008 Accra, Ghana LAMTO, Ivory Coast (6°13'N / 5°01'W) Monitoring...

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Transcript of Annual Meeting 25-27 Nov 2008 Accra, Ghana LAMTO, Ivory Coast (6°13'N / 5°01'W) Monitoring...