Holocene climate changes in the mid-high-latitude-monsoon margin reflected by the pollen record from Hulun Lake, northeastern Inner Mongolia
| Autor: | Dayou Zhai, Zaur Lomtatidze, Yuecong Li, Qinghai Xu, Jule Xiao, Shigeru Itoh, Zhigang Chang, Ruilin Wen |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Palynology
010506 paleontology geography geography.geographical_feature_category 010504 meteorology & atmospheric sciences Steppe Climate change Monsoon 01 natural sciences Arts and Humanities (miscellaneous) Climatology Paleoclimatology General Earth and Planetary Sciences East Asian Monsoon Physical geography Precipitation Geology Holocene 0105 earth and related environmental sciences Earth-Surface Processes |
| Zdroj: | Quaternary Research. 73:293-303 |
| ISSN: | 1096-0287 0033-5894 |
| DOI: | 10.1016/j.yqres.2009.10.006 |
| Popis: | Pollen-assemblage data from a sediment core from Hulun Lake in northeastern Inner Mongolia describe the changes in the vegetation and climate of the East Asian monsoon margin during the Holocene. Dry steppe dominated the lake basin from ca. 11,000 to 8000 cal yr BP, suggesting a warm and dry climate. Grasses and birch forests expanded 8000 to 6400 cal yr BP, implying a remarkable increase in the monsoon precipitation. From 6400 to 4400 cal yr BP, the climate became cooler and drier. Chenopodiaceae dominated the interval from 4400 to 3350 cal yr BP, marking extremely dry condition.Artemisiarecovered 3350-2050 cal yr BP, denoting an amelioration of climatic conditions. Both temperature and precipitation decreased 2050 to 1000 cal yr BP as indicated by decreasedArtemisiaand the development of pine forests. During the last 1000 yr, human activities might have had a significant influence on the environment of the lake region. We suggest that the East Asian summer monsoon did not become intensified until 8000 cal yr BP due to the existence of remnant ice sheets in the Northern Hemisphere. Changes in the monsoon precipitation on millennial to centennial scales would be related to ocean-atmosphere interactions in the tropical Pacific. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|