Please use this identifier to cite or link to this item: http://localhost:80/handle/1956/12376
Title: Increased ventilation of Antarctic deep water during the warm mid-Pliocene
subject: VDP::Matematikk og naturvitenskap: 400::Geofag: 450::Oseanografi: 452;VDP::Mathematics and natural scienses: 400::Geosciences: 450::Oceanography: 452
Publisher: Nature Publishing Group
Description: The mid-Pliocene warm period is a recent warm geological period that shares similarities with predictions of future climate. It is generally held the mid-Pliocene Atlantic Meridional Overturning Circulation must have been stronger, to explain a weak Atlantic meridional δ13C gradient and large northern high-latitude warming. However, climate models do not simulate such stronger Atlantic Meridional Overturning Circulation, when forced with mid-Pliocene boundary conditions. Proxy reconstructions allow for an alternative scenario that the weak δ13C gradient can be explained by increased ventilation and reduced stratification in the Southern Ocean. Here this alternative scenario is supported by simulations with the Norwegian Earth System Model (NorESM-L), which simulate an intensified and slightly poleward shifted wind field off Antarctica, giving enhanced ventilation and reduced stratification in the Southern Ocean. Our findings challenge the prevailing theory and show how increased Southern Ocean ventilation can reconcile existing model-data discrepancies about Atlantic Meridional Overturning Circulation while explaining fundamental ocean features.
publishedVersion
Journal Article
URI: http://localhost:80/handle/1956/12376
More Information: Nature Communications 2013, 4:1499
http://hdl.handle.net/1956/12376
1038477
10.1038/ncomms2521
Appears in Collections:Department of Earth Science

Files in This Item:
Click on the URI links for accessing contents.
Title: Increased ventilation of Antarctic deep water during the warm mid-Pliocene
subject: VDP::Matematikk og naturvitenskap: 400::Geofag: 450::Oseanografi: 452;VDP::Mathematics and natural scienses: 400::Geosciences: 450::Oceanography: 452
Publisher: Nature Publishing Group
Description: The mid-Pliocene warm period is a recent warm geological period that shares similarities with predictions of future climate. It is generally held the mid-Pliocene Atlantic Meridional Overturning Circulation must have been stronger, to explain a weak Atlantic meridional δ13C gradient and large northern high-latitude warming. However, climate models do not simulate such stronger Atlantic Meridional Overturning Circulation, when forced with mid-Pliocene boundary conditions. Proxy reconstructions allow for an alternative scenario that the weak δ13C gradient can be explained by increased ventilation and reduced stratification in the Southern Ocean. Here this alternative scenario is supported by simulations with the Norwegian Earth System Model (NorESM-L), which simulate an intensified and slightly poleward shifted wind field off Antarctica, giving enhanced ventilation and reduced stratification in the Southern Ocean. Our findings challenge the prevailing theory and show how increased Southern Ocean ventilation can reconcile existing model-data discrepancies about Atlantic Meridional Overturning Circulation while explaining fundamental ocean features.
publishedVersion
Journal Article
URI: http://localhost:80/handle/1956/12376
More Information: Nature Communications 2013, 4:1499
http://hdl.handle.net/1956/12376
1038477
10.1038/ncomms2521
Appears in Collections:Department of Earth Science

Files in This Item:
Click on the URI links for accessing contents.
Title: Increased ventilation of Antarctic deep water during the warm mid-Pliocene
subject: VDP::Matematikk og naturvitenskap: 400::Geofag: 450::Oseanografi: 452;VDP::Mathematics and natural scienses: 400::Geosciences: 450::Oceanography: 452
Publisher: Nature Publishing Group
Description: The mid-Pliocene warm period is a recent warm geological period that shares similarities with predictions of future climate. It is generally held the mid-Pliocene Atlantic Meridional Overturning Circulation must have been stronger, to explain a weak Atlantic meridional δ13C gradient and large northern high-latitude warming. However, climate models do not simulate such stronger Atlantic Meridional Overturning Circulation, when forced with mid-Pliocene boundary conditions. Proxy reconstructions allow for an alternative scenario that the weak δ13C gradient can be explained by increased ventilation and reduced stratification in the Southern Ocean. Here this alternative scenario is supported by simulations with the Norwegian Earth System Model (NorESM-L), which simulate an intensified and slightly poleward shifted wind field off Antarctica, giving enhanced ventilation and reduced stratification in the Southern Ocean. Our findings challenge the prevailing theory and show how increased Southern Ocean ventilation can reconcile existing model-data discrepancies about Atlantic Meridional Overturning Circulation while explaining fundamental ocean features.
publishedVersion
Journal Article
URI: http://localhost:80/handle/1956/12376
More Information: Nature Communications 2013, 4:1499
http://hdl.handle.net/1956/12376
1038477
10.1038/ncomms2521
Appears in Collections:Department of Earth Science

Files in This Item:
Click on the URI links for accessing contents.