Late Quaternary Vegetation History And Climate Change In The Gobi Desert, South Mongolia

摘要: Southern Mongolia is a part of the arid to semiarid region Central Asia and represents transitional zone between circulation systems westerlies associated North Atlantic Oscillation (NAO), Asian summer monsoon the Mongolian High Pressure System (MHPS). The sedimentary records from this geographically important are central key to understand past vegetation climate changes, owing to variations in intensity interacting systems. It is imperative understand palaeoclimate dynamics landscape development based on history and get notion about future environmental conditions under the ongoing Global change. available palaeo-vegetation and palaeo-climate data from mainly conducted in Northwestern Northwestern China. present research work focus palaeo-ecological analyses two lake archives of southern (Bayan Tohomiin Nuur Orog Nuur). The multidisciplinary these sediment cores were carried out reconstruct level expose influencing biotic or abiotic factors during last 50 kilo calibrated years before (50 ka cal BP). Palynological geochemical analyses Bayan revealed detailed history of vegetation landscape in continental from 15 4 BP. reconstructed phases between 12.3- 11.1 8.6- 7.6 BP can be correlated Younger Dryas 8.2 event respectively. Stable relatively moist occurred mid-Holocene 6.3 4.9 ka cal A moisture maximum attributed to the strengthening westerlies. However, combined influence caused quite humid phase just before Holocene optimum, while bordering areas north south investigation area dry. The aridity southern increased after 3.8 as inferred geochemical record archive. The palynological study sediments show reconstructed ka. Generally semi humid prevailed between 49.5 44.7 BP, correlating Marine Oxygen Isotope stage 3 (MIS 3). is followed by relatively dry cool 23.2 corresponding 2 2). The increase concentration green algae Pediastrum and Botryococcus indicate increase 23.2 and 22.7 aridity increases since 18.9 kacal till onset early Holocene. Our findings indicate continuous oscillations documented period of about ka. Generally desert steppe is prevailing as indicated Artemisia, Chenopodiaceae Ephedra. Our show general consistence data with surrounding regions Asia. further multidisciplinary studies palaeo-climate archives emphasized to gain deeper understanding changes and to decode complex spatial pattern arid Central late Quaternary. Such multidisciplinary approach will provide base predictions for future contribute information for nature conservation.