期刊
JOURNAL OF PALEOLIMNOLOGY
卷 33, 期 3, 页码 283-302出版社
SPRINGER
DOI: 10.1007/s10933-004-5331-z
关键词
Argentina; lacustrine sediments; lake level changes; Little Ice Age; Medieval Climate Anomaly; Southern Patagonia
The volcanogenic lake Laguna Potrok Aike, Santa Cruz, Argentina, reveals an unprecedented continuous high resolution climatic record for the steppe regions of southern Patagonia. With the applied multi-proxy approach rapid climatic changes before the turn of the first millennium were detected followed by medieval droughts which are intersected by moist and/or cold periods of varying durations and intensities. The 'total inorganic carbon' content was identified as a sensitive lake level indicator. This proxy suggests that during the late Middle Ages (ca. AD 1230 - 1410) the lake level was rather low representing a signal of the 'Medieval Climate Anomaly' in southeastern Patagonia. At the beginning of the 'Little Ice Age' the lake level rose considerably staying on a high level during the whole period. Subsequently, the lake level lowered again in the course of the 20th century.
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