A 1000-YEAR OXYGEN ISOTOPE RECORD OF SOUTH AMERICAN HYDROCLIMATE FROM LAKE JUNIN IN THE CENTRAL ANDES OF PERU
作者： Mark Abbott , Kaitlin Clark
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摘要: The South American Summer Monsoon (SASM) provides the Peruvian Andes with precipitation during austral summer. Over multidecadal timescales SASM is influenced by sea surface temperature (SST) anomalies, land-sea gradients, El Nino Southern Oscillation (ENSO) and location of Intertropical Convergence Zone (ITCZ). Decadal to multi-decadal changes in are documented δ18O values authigenic calcite precipitated from waters Lake Junin (11.0°S, 76.2°W), which today a hydrologically open-basin lake system. This sediment record archives calcite-rich sediments that were used determine timing magnitude regional associated variability SASM. Low provide evidence for strengthened monsoon system spanning Little Ice Age (LIA) AD 1250 1600. Following LIA, higher Current Warm Period (CWP) 1850 present consistent time decreased intensity. These data suggest sensitive ITCZ, Atlantic tropical SST anomalies controlled Northern Hemisphere temperatures. The deviates other paleoclimate records 1932, recording sharp sustained decrease values. event attributed construction Upamayo Dam, resulted impoundment Rio San Juan Junin, delivering river low meteoric rainwater lake. Trace metal reveals uniform enrichment beginning at 12 cm depth (AD 1932), providing reliable age-depth correlation between 12cm dam 1932. This project demonstrates ITCZ location, dominantly anomalies. relationship suggests continued warming north will prove be detrimental latitudes reducing across region.
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