On the position of southern hemisphere westerlies at the Last Glacial Maximum: an outline of AGCM simulation results and evaluation of their implications

Karl-Heinz Wyrwoll, Buwen Dong, P. Valdes

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    72 Citations (Scopus)

    Abstract

    The paper evaluates the claim of a poleward displacement of the southern hemisphere mid-latitude westerly circulation at the Last Glacial Maximum (LGM). The claim was initially based on the interpretation of the Late Quaternary paleoenvironmental records of southern South America and drew on conceptual paleo-circulation reconstructions and the results of early AGCM simulations. A guide to likely LGM changes in the position of the southern hemisphere westerlies can in principle be obtained through a modelling of associated storm tracks. A detailed analysis of the position of the southern hemisphere storm tracks at the LGM was undertaken using the UGAMP GCM. The results of the experiment suggest that a general poleward displacement of the zonal maximum of the southern hemisphere westerlies occurred at the LGM. But this is a generalization and in detail the changes in the westerly circulation are more far-ranging with significant regional differences. (C) 2000 Elsevier Science Ltd. All rights reserved.
    Original languageEnglish
    Pages (from-to)881-898
    JournalQuaternary Science Reviews
    Volume19
    DOIs
    Publication statusPublished - 2000

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