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Discussion papers | Copyright
https://doi.org/10.5194/cp-2018-12
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 21 Mar 2018

Research article | 21 Mar 2018

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This discussion paper is a preprint. A revision of the manuscript is under review for the journal Climate of the Past (CP).

Link between the Surface Mass Balance of the Greenland Ice Sheet and the North Atlantic Oscillation under preindustrial and last interglacial climates: a study with a Coupled Global Circulation Model

Silvana Ramos Buarque and David Salas y Melia Silvana Ramos Buarque and David Salas y Melia
  • Centre National de Recherches Météorologiques (CNRM), Toulouse, 31057, France

Abstract. The relationship between the Surface Mass Balance (SMB) of the Greenland Ice Sheet (GrIS) and the North Atlantic Oscillation (NAO) is examined from numerical simulations performed with a new atmospheric stretched grid configuration of the Centre National de Recherches Météorologiques – Coupled Model (CNRM-CM) version 5.2 under three periods : preindustrial climate, a warm phase (early Eemian, 130kaBP) and a cool phase (glacial inception, 115kaBP) of the last interglacial. The horizontal grid of the atmospheric component of CNRM-CM5.2 is stretched from the tilted pole on the Baffin Bay (72°N, 65°W) in order to obtain a higher spatial resolution on Greenland. The correlation between simulated SMB anomalies averaged over Greenland and the NAO index is weak in winter and significant in summer (about 0.6 for the three periods). In summer, spatial correlations between the NAO index and SMB display different patterns from one period to another. These differences are analysed in terms of the respective influence of the positive and negative phases of the NAO on accumulation and melting. Accumulation in South Greenland is significantly correlated with the positive (negative) phase of the NAO in a warm (cold) climate. Under preindustrial and 115ka climates, melting along the margins is more correlated with the positive phase of the NAO than with its negative phase, whereas at 130ka it is more correlated with the negative phase of the NAO in North and North-East Greenland.

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Silvana Ramos Buarque and David Salas y Melia
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Silvana Ramos Buarque and David Salas y Melia
Silvana Ramos Buarque and David Salas y Melia
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Short summary
The link between the Surface Mass Balance of the Greenland Ice Sheet with the North Atlantic Oscillation (NAO) is examined from simulations performed with the new stretched coupled model ARPEGE which has a high resolution (50 km). This study has highlighted that during preindustrial and interglacial period, in summer the accumulation in the South Greenland is significantly correlated with the positive (negative) phase of the NAO in a warm (cold) climate.
The link between the Surface Mass Balance of the Greenland Ice Sheet with the North Atlantic...
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