Palynological Assemblages And Paleoclimate Quantitative Reconstruction In The Ebinur Lake Region Since The Holocene

The inland arid, semi-arid closed lakes the response is very sensitive to climate change,so it is the ideal paleoenvironmental research sites, and palynological assemblages of lakesediments can directly reflect the landscape and vegetation types of plant communities inthe Lake District, and thus become an important paleoclimate research. Ebinur Lake islocated in the Junggar Basin of the southwest, is the center of this catchment area.214surface pollen samples taken from the Ebinur Lake region, combined with a near18meteorological stations in the30years1970-2000meteorological data and the the EbinurLake easterly direction1.7meters deep profiles use WAPLS (weighted average method ofleast squares) quantitative Ebinur Lake region since the mid-Holocene paleoclimatereconstruction evolution: between4730-4014a BP Ebinur Lake region showed a cold wetclimate characteristics, the average temperature of-2.8°C, average precipitation270.5mm;in between4014-2780a BP less precipitation, average precipitation is252.5mm, and lowtemperature, average temperature of-3.5°C the the Ebinur Lake region as a whole desertvegetation landscape shows a cold and dry climate conditions; in2780-2382a BP betweentemperature rise, an average of-2.9°C temperature rise compared to the previous vicinity;precipitation between299-400mm, average351mm, river water within the basin plentyEbinur Lake in the high lake period; in2382-2134a BP, the average temperature of-1.8‵,the average annual rainfall is216mm, elevated temperatures and decreased precipitationEbinur Lake area of narrow period, the Lake weekly desert vegetation. Some evidenceindicates that the entire northern region of Xinjiang may show a warm and dry climateenvironment. Between2134-1437a BP, the average temperature of-0.6°C and an averagerainfall of310mm, rising temperatures, increased precipitation, river basin of water, thelake is higher; between1437-131a BP, with an average temperature of0.7‵, the averageannual rainfall is339mm, Overall, temperature increases, precipitation increases, EbinurLake in the high-water period, which reflects the environment in the Middle Ages, EbinurLake area may be significantly better than modern. The segment late watching, fern sporesincrease the temperature drop may show the Little Ice Age about the17th century to theearly19th century, the Ebinur Lake region in the westerlies, affected by the monsoon isweak, in cold climate period, by stems from Atlantic westerlies strongly southward gas thecyclone strengthened affect, bring more water vapor. Ebinur Lake water level in a relative period of rise. Nearly200years, due to the impact of human activities, the the Ebinur Lakeregion growing drought, intensified desertification of lakefront, become one of the mainsource of dust storm in western China.