The impacts of the North American ice-sheet on glaciation conditions over northern Europe: an atmospheric circulation study with the LMDZ model* Pauline.

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Presentation transcript:

The impacts of the North American ice-sheet on glaciation conditions over northern Europe: an atmospheric circulation study with the LMDZ model* Pauline Beghin1, Sylvie Charbit1, Masa Kageyama1 Christophe Dumas1, Catherine Ritz2 1: Laboratoire des Sciences du Climat et de l’Environnement/IPSL, Gif-sur-Yvette, France 2: Laboratoire de Glaciologie et de Géophysique de l’Environnement, Grenoble, France *A study published in Beghin et al, Climate of the Past Discussions, 11, 26-61, 2015

Glacial-interglacial cycles Main contributors to glacial-interglacial sea-level changes: North American and European ice sheets Massive mid-latitude ice-sheets  strong disturbance to atmospheric circulation Interplay between these two ice-sheets via the atmospheric circulation? Here, we study the impact of the North American ice-sheet on European climate Relative sea level (m) Waelbroeck et al, 2002 time (ky)

Model and experiments model LMDZ5 atmospheric model, 96x95x39, as in IPSL_CM5A_LR Atmospheric composition, insolation, land-sea mask as in IPSL LGM PMIP3-CMIP5 simulation SSTs and sea-ice from IPSL LGM PMIP3-CMIP5 run (Kageyama et al, Climate Dynamics 2012) 5 experiments with/without North American ice-sheet albedo and varying topography from PI to LGM; no European ice-sheet boundary conditions

Winter atmospheric circulation changes no ice sheet flat ice sheet Atlantic jet stream more zonal Winds more northerly for NE Europe full ice sheet m/s

Winter circulation and European climate temperature anomalies ( K) precipitation anomalies (mm/day) Atlantic jet stream more zonal Winds more northerly for NE Europe m/s

Relationship between precipitation and jet changes precipitation anomalies (mm/day) Jet stream latitudinal position change Precipitation changes over Scandinavia So… A higher North American ice-sheet drives a drier Scandinavia/Barents/Kara area … not so good for building an ice-sheet!

Summer climate change SUMMER WINTER flat ice sheet strong cooling over Barents-Kara Seas cooling decreases as North American ice sheet gets higher cooling increases as North American ice sheet gets higher

Summer atmospheric circulation changes temperature anomalies ( K) trough over North American ice sheet southerlies reach further north

atmospheric circulation Summary change in annual precip change in annual snowfall North American ice sheet atmospheric circulation (stationary waves) WINTER over NE Europe cooler temperatures less precip (jet shifts S’d) SUMMER over NE Europe flat ice  colder but cold anomaly decreases as N America altitude increases  Impact on potential NE European ice sheet?

Ice sheet growth from GRISLI ice sheet model flat North American ice sheet favours growth of NE European ice sheet North American ice sheet growth inhibits NE European ice sheet growth

Conclusions & perspectives Atmospheric circulation changes due to North American ice sheet are large enough to impact on ice sheet growth over NE Europe Our results suggest a succession of ice sheet states with 1/ low North America ice sheet, built up of European IS 2/ growth of North America IS, smaller European IS BUT Our experiments are highly idealised, North American ice sheet did not appear all at once Need to refine experiments, e.g. using recent reconstructions from Kleman et al (2013)

Thank you! Cosquer Lascaux