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Added value of a regional climate model (MAR) for simulating the current surface mass balance of the Antarctic ice sheet compared to a general circulation model (ACCESS1.3)

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(1)

Added value of a regional climate model

(MAR) for simulating the current surface

mass balance of the Antarctic ice sheet

compared to a general circulation model

(ACCESS1.3)

C. Kittel

(2)

Introduction

(3)

Introduction

General circulation model (GCM)

Climate projections

Inputs for ice sheet models for the next IPCC report

BUT

Low resolution

Poor representation of polar climate specificities

Are we using the right tool for predicting the Antarctic surface climate?

(4)

Methods

Comparing the SMB modelled by a RCM and a GCM

ACCESS1.3

 1.25°x1.25° resolution

 Does not directly compute the SMB

 SMB ≈ SF + RF - SU

AC3 mean SMB (1980-2005) (kg/m²yr)

(5)

Methods

Comparing the SMB modelled by a RCM and a GCM

MAR

Polar-adapted physics

Correctly represents the Antarctic SMB (dz/dt) 35km x 35km

(6)

Integrated values

Gt/yr SMB SF RF SU ME

MAR-ERI 2557 2664 33 140 35

MAR-AC3 2635 2717 41 123 41

(7)
(8)

Spatial comparison

(9)

Discussion

But what about the representation of the summer climate?

°C Mean Bias RMSE r

MAR-ERI -1.6 2.2 0.99

MAR-AC3 -1.2 2.6 0.99

(10)

Conclusion

• Using a RCM seems to be not required to represent the current mean SMB of the Antarctic Ice Sheet

• Better representation of the summer climate by MAR

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