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Altered Atmospheric Circulation during Last Glacial Maximum

This study examines the altered atmospheric circulation regime during the Last Glacial Maximum, comparing it to the present climate. The research suggests a stronger and steadier Atlantic jet, reduced storminess, and a poleward heat flux at 850mb, among other findings.

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Altered Atmospheric Circulation during Last Glacial Maximum

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  1. An altered atmospheric circulation regime during Last Glacial MaximumCamille Li, Aaron DonohoeDavid BattistiUniversity of Washington

  2. Coupled model winter jet and storminess poleward heat flux 850mb (Km/s)

  3. Coupled model winter jet and storminess • Compared to today’s climate, the ice age climate simulated by the coupled model exhibits • a stronger, steadier Atlantic jet • reduced storminess poleward heat flux 850mb (Km/s)

  4. Coupled model winter jet and storminess poleward heat flux 850mb (Km/s)

  5. Coupled model winter jet and storminess Laurentide elevation (km) ICE-5G ICE-4G poleward heat flux 850mb (Km/s)

  6. CAM Model Run with ICE 5G Vertically Integrated JFM Eddy Heat Transport LGM Modern K m/s LGM- Modern Contours are the jet speed at 400 hPa

  7. I.) Narrow LGM jet inhibits storm growth Jet Speed Cross Sections LGM jet is narrow Possible Causes of Reduced LGM Atlantic Storminess NOT Strong enough effect II.) High LGM Static stability inhibits storm growth Strong LGM Baroclinicity still predicts stronger storm Growth III.) LGM Storms are not seeded efficiently LGM Modern 50 Magnitude Geopotential Height Perturbation (meters) 0 0 4 8 12 16 Days Since Storm Entered Atlantic Domain

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