Glaciares de Chile


"Continental-scale temperature variability during the last two millennia"

PAGES2K Consortium, including A. Rivera (2013) : «Continental-scale temperature variability during the last two millennia» Nature Geoscience, DOI:10.1038/NATGEO1797 .

Resumen / Abstract.

Past global climate changes had strong regional expression. Toelucidate their spatio-temporal pattern, we reconstructed past temperatures for seven continental-scale regions during the past one to two minennia. The most coherent feaure in nearly all of the regional temperature reconstructions is a long-term coolingtrend, which ended late in the nineteenth century. At multidecadal to centennial scales, temperature variability shows distinctly different regional patterns, with more similarity within each hemisphere than between them. There were no globally synchronous multi-decadal warm or cold intervals that define a worldwide Medieval Warm Period or Little Ice Age, but all reconsbuctions show generally cold conditions between AD 1580 and 1880, punctuated in sorne regions by warm decades during the eighteenth century. The bansition to these colder conditions occurred earlier in the Arctic, Europe and Asia than in North America or the Southern Hemisphere regions. Recent warming reversed the Iong-term cooling; during the period AD 1971-2000, the area-weighted average reconsbuded temperature was higher than any other time in nearly 1,400 years.