Objective Reconcile the conflicting evidence of the meridional westerly wind shift during the Last Glacial Maximum LGM indicated by proxyrecords from the atmosphere and ocean Approach ID: 442510
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The De-correlation of Westerly Winds and Westerly-Wind Stress over the Southern Ocean during the Last Glacial Maximum
Objective
Reconcile the conflicting evidence of the meridional westerly wind shift during the Last Glacial Maximum (LGM) indicated by proxy-records from the atmosphere and oceanApproachPerform a data-model comparison using paleo-reconstructions, modern observations and reanalysis products and 8 state-of-art models that participated in the latest Paleoclimate Modelling Intercomparison Project phase 3 (PMIP3).Analyze mismatch between the strengthening and poleward shift in the westerly winds and weakening and equatorward shift in the westerly-wind stress over the Southern Ocean in some models. The de-correlation between winds and wind stress was further analyzed as it may reflect the real LGM condition when the extensive Antarctic sea ice intrusion during the LGM reduces the efficacy of the westerly winds in generating stress over the liquid ocean, leading to the mismatch.
ImpactReconciled the conflicting paleo-climate evidence of westerly winds over the Southern Ocean during the LGM and revealed how they compared to modern climateDemonstrated that climate models that are skillful in simulating the present-day conditions are also useful for understanding paleo-climate and interpreting paleo-climate records
W Liu, J Lu, LR Leung, S-P Xie, Z Liu, and J Zhu. 2015. “The De-correlation of Westerly Winds and Westerly-Wind Stress over the Southern Ocean during the Last Glacial Maximum.” Climate Dynamics early online. DOI: 10.1007/s00382-015-2530-4
S
urface
winds,
wind
speed,
wind
stress,
and 90% sea ice
in
the LGM simulated by a GCM.
Note in (b) the maximum wind speed (wind stress) to the south (north) of the sea ice margin, showing a de-correlation between winds and wind stress