Report
HOLOCENE PRECIPITATION RECORDS FROM INNER MONGOLIA DERIVED FROM HYDROGEN ISOTOPE COMPOSITIONS OF SEDIMENT FATTY ACIDS
| العنوان: | HOLOCENE PRECIPITATION RECORDS FROM INNER MONGOLIA DERIVED FROM HYDROGEN ISOTOPE COMPOSITIONS OF SEDIMENT FATTY ACIDS |
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| المؤلفون: | Chen, Qingmin, Zhou, Weijian, Wang, Zhe, Xian, Feng, Burr, George S. |
| بيانات النشر: | UNIV ARIZONA DEPT GEOSCIENCES |
| سنة النشر: | 2019 |
| المجموعة: | Institute of Earth Environment: IEECAS OpenIR (Chinese Academy of Sciences) / 中国科学院地球环境研究所机构知识库 |
| مصطلحات موضوعية: | Duoerji, East Asian monsoon, hydrogen isotopes, n-fatty acids, precipitation records, GRAIN-SIZE DISTRIBUTION, ASIAN MONSOON, N-ALKANES, LEAF WAXES, LACUSTRINE SEDIMENTS, HIGH-RESOLUTION, CLIMATIC-CHANGE, NORTHERN IDAHO, LAKE-SEDIMENTS, D/H RATIOS, Geochemistry & Geophysics |
| الوصف: | The Inner Mongolian Plateau lies along the northern limit reached by the East Asian summer monsoon. This geographic setting makes it especially sensitive to environmental change and an excellent site for understanding Quaternary East Asian monsoon variability. In this study we present new results of hydrogen isotopic compositions of fatty acids extracted from sediments, which were used to construct Holocene paleoprecipitation (or moisture) changes in Northern China. The hydrogen isotopic composition (D/H ratio) of n-acids in the sedimentary sequence of the Duoerji peat. Inner Mongolia, was determined with gas chromatography and mass spectrometry. Changes in the precipitation from middle Inner Mongolia are recorded by the D/H ratio of n-C-20, n-C-22, n-C-24, n-C-26, n-C-28 acids (delta D). From 10-9 ka, the relatively high delta D values indicate reduced precipitation in the Early Holocene. Subsequently, increased precipitation is reflected by reduced delta D values from 9-5.5 ka. After 5.5 ka, gradually increasing delta D values record an overall decrease in precipitation. The precipitation trends established for the Duoerji sequence are consistent with other major paleoclimate proxies in the East Asian monsoon region, especially with a distinct Holocene optimum of increased monsoonal activity from 9-5.5 ka. The delta D resulting paleo-precipitation record clearly shows that the Holocene climate in Northern China is basically controlled by the insolation changes. |
| نوع الوثيقة: | report |
| اللغة: | English |
| Relation: | RADIOCARBON; http://ir.ieecas.cn/handle/361006/14341; http://ir.ieecas.cn/handle/361006/14342 |
| DOI: | 10.1017/RDC.2018.75 |
| الاتاحة: | http://ir.ieecas.cn/handle/361006/14341 http://ir.ieecas.cn/handle/361006/14342 https://doi.org/10.1017/RDC.2018.75 |
| رقم الانضمام: | edsbas.62C6897B |
| قاعدة البيانات: | BASE |
| DOI: | 10.1017/RDC.2018.75 |
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