2:15 PM - 2:37 PM
[MIS10-26] A history of regional change in hydrological changes in southeast Eurasia
Keywords:Monglian Plateau, Lake level, Lake sediment
We investigated paleoclimatic/environmental changes of northern Mongolia based on chemical and mineralogical analyses of sediment cores from Lake Hovsgol and Lake Erhel back to 18.9 and 34.3 cal. ka BP, respectively (Katsuta et al., 2007). The climate of this region was dry in the glacial period, and wet in the Holocene. Desalination of Lake Hovsgol occurred at 13.2-11.6 cal. ka BP, i.e., during the transition from the late glacial to early Holocene. At the same time, ca. 12.82 cal. ka BP, deposition in the Lake Erhel area changed from fluvial to lacustrine. Climate of northern Mongolia was humid during the late glacial to the early Holocene period (ca. 10.57-7.24 cal. ka BP for the Hovsgol and from ca. 12.82 to 7-8 cal. ka BP for the Erhel). This reconstruction differs from that for the more northern Lake Baikal region, which humidification continued from the last glacial period until mid-Holocene. This difference could be attributed to longer period of glacier melting and permafrost thawing around the Baikal and on its watershed, associated with increased summer insolation. In this presentation, we are planning to discuss the long-term history of hydrological changes based on the Lake Hovsgol sediment records.