EBOOK Ice Age Southern Andes C.J. Heusser.pdf

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EBOOK Ice Age Southern Andes

C.J. Heusser

Elsevier

A Chronicle of Palaeoecological Events The Southern Andes, stretching from the subtropics to the

subantarctic, are ideally located for palaeoenvironmental research. Over the broad and continuous

latitudinal extent of the cordillera (-24), vegetation is adjusted to climatic gradients and atmospheric

circulation patterns.Opposed to the prevailing Southern Westerlies, the Southern Andes are positioned to

receive the brunt of the winds, while biota are set to record the shifting of incoming storm systems over

time. Sequential, latitudinally-placed, sedimentary deposits containing microfossils and macroremains, as

archives of past vegetation and climate, make possible the detection of equatorward and poleward

displacement of plant communities and, as a consequence, changes in climatic controls. No terrestrial

setting in the Southern Hemisphere is so unique for palaeoenvironmental reconstruction during and since

the last ice age. Twenty radiocarbon-dated fossil pollen and spore records chosen to place emphasis on

the last ice age include high-resolution, submillennial data sets that also cover the Holocene, thus

providing contrast between present interglacial and past glacial ages. From a refined data base, the

records constitute the foundation for interpreting factors responsible for vegetation change over >50,000

C years, glacial-interglacial migration and refugial patterns for a diversity of taxa, and the extent of

intrahemispheric and polar hemispheric synchroneity versus asynchroneity.

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