Late Quaternary paleoenvironmental reconstruction of the Buor Khaya peninsula using a multiproxy approach

The study site Buor Khaya peninsula (71°34' N, 132°12' E) is surrounded by the Laptev Sea and located in the northeastern part of Yakutia, Russia. The aims and objectives of this study is a paleoenvironmental reconstruction of Buor Khaya during the Late Quaternary using a multi proxy approach. In detail, two shore sediment profiles were utilized analyzing ground ice (180, 2H), bioindicators (macro fossils, macro remains) and sediments (mass specific magnetic susceptibility, grain-size parameters, biogeochemistry, bulk density, density fractionation, radiocarbon age) in order to receive detailed information on the paleoenvironmental development. Moreover, stratigraphic differentiated carbon inventory calculation has been focus to study the transformation of organic matter. In this context, degradation of organic carbon matter fixed in the permafrost was of particular interest. Having detected all proxies, the two archives contain lake sediments of former thermo karst lakes of Holocene ages. They reveal different stages of thermokarst development. The longer profile BUO-05 show increasing grain size from the bottom to the top, which can be explained with higher transportation energy. In addition, the short profile BUO-03 has a remarkable high ice content. Continuing the data interpretation will certainly reveal further results.