000016585 001__ 16585
000016585 037__ $$aUTEXAS:2152/4084
000016585 041__ $$aeng
000016585 245__ $$aDendroclimatic Research in the South American Sector of the Southern Ocean: Indicators of Atmosphere-Ocean Climate Variability
000016585 260__ $$c2001
000016585 500__ $$a
000016585 520__ $$aA tree-ring chronology network recently developed from the subantarctic forests provides an opportunity to study long-term climatic variability at higher latitudes in the South American sector of the Southern Ocean. Based on the longest pressure records available in the South American-Antarctic Peninsula (SAAP) sector of the Southern Oceans, zonal and meridional indices have been developed for the region. Temperature records in southern South America and the Antarctic Peninsula are strongly affected by the strength of the meridional flow, whereas precipitation variations along the Pacific coast in southern South America are more related to changes in the zonal circulation at higher latitudes. We employed dendroclimatic techniques for reconstructing both the zonal (ZSAAP) and the meridional (MSAAP) circulation indices over the past four centuries. The ZSAAP reconstruction shows dominant modes of variation at around 4.4 and 5 years, which may be associated with the proposed Antarctic Circumpolar Wave in the Southern Oceans. Contrasting patterns in meridionality during the past two centuries are observed in the MSAAP reconstruction. Since the mid 1950s the northerly flow has steady increased, reaching unprecedented levels during the 1980s in the context of the past 400 years.
000016585 65017 $$aSouth America
000016585 6557_ $$aWorking Paper
000016585 7860_ $$nVisiting Resource Professors Papers;
000016585 8564_ $$uhttp://repositories.lib.utexas.edu/handle/2152/4084$$zUTEXAS:2152/4084
000016585 909C0 $$Y
000016585 909C4 $$dhttp://repositories.lib.utexas.edu/handle/2152/4084$$pUTEXAS:2152/4084
000016585 980__ $$aUTEXAS