ECCO2 and Carbon Cycle Modeling :Arctic Ocean Applications

Manfredi Manizza, EAPS-MIT

OUTLINE ?

1) Why the Arctic Carbon Cycle and ECCO2 ?

2) Where are we now ?

3) To do next

4) Open Discussion

1 - Arctic Carbon Budget (NSF funded)

TERRESTRIAL BIOSPHERE

OCEAN(Physics/BGC)

ATMOSPHERE

Manizza, Follows, Marshall (MIT)

Prinn (MIT)

McGuire et al. (U. Alaska)

CO2 Fluxes CO2 Fluxes

DOCInput

From Global to Regional with ECCO2

1) Global ECCO2 Solutions of Eddy-Resolving (1/4)MITgcm (Cube22 and more - Hill & Menemenlis).

2) Use of Arctic domain and extraction of physicalfields (uvw,T,S,KPP,sea-ice cover,etc).

3) Set-up for OFF-LINE experiments on ACESCluster @ MIT with MITgcm.

4) Implementation of ocean biogeochemical schemesof different complexity.

QuickTime™ and aYUV420 codec decompressor

are needed to see this picture.

Global Cubed Sphere from ECCO2

Face 3

Focus on the Arctic Ocean (Face 3)

440 Grid Points

400 Grid Points50 Vertical Levels

Original Face 3 (510x510x50)

2 - Tracer Release Experiment 1 : Out of Bering Strait

7 years – continuous ink source – instant monthly velocity fields

Surface flow

[Tracer]@ surface

0

10

2 - Where are we now ?

I) Set-up on MIT ACES cluster : DONE !

II) Testing Tracer Release/Sponge Layer : DONE !

III) Reaching Optimal Comput. Speed : ALMOST DONE..

IV) Experiments with decaying tracer : TO START

V) Activation Full Ocean Carbon PKG : Long Term Goal.

3 - Arctic Rivers & Ocean Carbon Cycle

TERRESTRIAL BIOSPHERE

OCEAN

ATMOSPHERE

Riverine Carbon Transfer

CO2 Fluxes CO2 Fluxes

DOC Input

3 -River-dominated semi-enclosed system

Arctic Ocean = 10 % Global Ocean

1/2 Global Ocean Run-Off into the Arctic !!!!

Discharge (m3 m2 yr-1)

0.05 0.15 0.25 0.35

DOC export (g C m

-2 yr

-1)

0.5

1.5

2.5

ObYukonLenaYeniseyMackenzie

Arctic Rivers & DOC

Data from Bruce Peterson, MBL

DOC ExportgC/m2/yr

Assessing Lifetime of Riverine DOC

Circulation Only

Circul. + Decay

∂C/∂t = Adv. + Diff.

∂C/∂t = Adv. + Diff. + C

= 1/ = Decay Time Scale = 1 month; 10 years ; 100

years

C = Idealized Tracer

Tracer Release Experiment 2 : Lena River Mouth

6 years – continuous ink source – instant monthly velocity fields

Surface flow

[Tracer]@ surface

10

0

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are needed to see this picture.

Arctic Project To-Do List

1) Reshaping NEW Arctic Domain (last minute) : COMMON ARCTIC GRID of ECCO2 (CAGE-2).

2) Use of latest version of ECCO2 (Cube 47) solutions including Freshwater Run-Off Dataset from P. Winsor.

3) Adaptation to CAGE-2 of DOC River Discharge Dataset from McClelland (UTexas) & Peterson (MBL).

THANKS to :

Stephanie Dutkiewicz, Chris Hill, Jean-Michel Campin,Mick Follows, John Marshall, Dimitris Menemenlis,

Peter Winsor, Bruce Peterson.