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.

Second dataset of core PTA02-04 included in doi:10.1594/PANGAEA.672039. Age for flooded shore sample = percent of modern carbon (pMC). Project: South Argentinean Lake Sediment Archives and modeling (SALSA) http://www.salsa.uni-bremen.de; funded by German Ministry of Education and Research (BMBF) within the framework of the German Climate Research Program DEKLIM, http://www.deklim.de

Supplement to: Haberzettl, Torsten; Fey, Michael; Lücke, Andreas; Maidana, Nora; Mayr, Christoph; Ohlendorf, Christian; Schäbitz, Frank; Schleser, Gerhard Hans; Wille, Michael; Zolitschka, Bernd (2005): Climatically induced lake level changes during the last two millennia as reflected in sediments of Laguna Potrok Aike, southern Patagonia (Santa Cruz, Argentina). Journal of Paleolimnology, 33(3), 283-302