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| DOI | 10.1016/j.quascirev.2020.106568 |
| Seasonal wet-dry variability of the Asian monsoon since the middle Pleistocene | |
Wang, Xin; Dettman, David L.; Wang, Mi; Zhang, Jinhui; Saito, Yoshiki; Quade, Jay; Feng, Song; Liu, Jianbao ; Chen, Fahu
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| 通讯作者 | Wang, X (通讯作者) |
| 发表日期 | 2020 |
| ISSN | 0277-3791 |
| 卷号 | 247 |
| 英文摘要 | Wet summers and dry winters are an essential feature of monsoon climates, but quantification of change in wet-dry seasonality through time is very challenging because most geological materials fail to record sub-annual environmental signals, instead integrating years, decades, or centuries. Here we quantify Asian wet-dry seasonality since the middle Pleistocene for monsoon climates using high-resolution stable oxygen isotope analysis of land snail shells from the Chinese Loess Plateau. This approach allows us to collect data on single seasons and years in geologic history. Modern shells show that: 1) the delta O-18(shell) values are higher in boreal winter (dry) seasons and lower in boreal summer (wet) seasons; 2) winter - summer differences in delta O-18(shell) (up to 19.2 parts per thousand) are much larger than that expected from seasonal temperature variation; and 3) the delta O-18(shell) range (the difference between the most positive and the most negative values) within a shell records the degree of evaporation of snail body water in the dry season, combined with a rainfall delta O-18/temperature indicator in the wet season. This range can be used as a wetdry seasonality proxy index, although clearly more work is required to calibrate this index. delta O-18(shell) ranges in glacial loess strata (mean = 13.6 parts per thousand) are systematically larger than those from interglacial paleosol layers (mean = 8.6 parts per thousand), suggesting that a significant difference in winter aridity was present, with drier winters in glacial periods and wetter winters in interglacial periods since the middle Pleistocene. This pattern may have been modified by the intrusion of the westerlies into the region in glacial dry seasons. Summer minimum delta O-18(shell) values are similar throughout the record, which contrasts significantly with glacial/interglacial speleothem records, especially if these represent typical monsoon stable isotope patterns in rains. However, if some moisture from the westerlies contribute more negative delta O-18 values in glacial intervals, these minimum delta(18)O( )values may not contradict the patterns seen in the speleothem record. Future work should focus on the seasonal timing of the isotope cycles in land snail shells. (C) 2020 The Author(s). Published by Elsevier Ltd. |
| 关键词 | STABLE-ISOTOPE COMPOSITIONLAND SNAIL SHELLSLAST GLACIAL MAXIMUMOXYGEN-ISOTOPESUMMER MONSOONINTERANNUAL VARIABILITYNORTHWESTWARD MIGRATIONCLUMPED ISOTOPESTIBETAN PLATEAUNORTH-ATLANTIC |
| 英文关键词 | Seasonality; Asian monsoon; Oxygen isotopes; Land Snails; Pleistocene |
| 语种 | 英语 |
| WOS研究方向 | Physical Geography ; Geology |
| WOS类目 | Geography, Physical ; Geosciences, Multidisciplinary |
| WOS记录号 | WOS:000581521700014 |
| 来源期刊 | QUATERNARY SCIENCE REVIEWS
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| 来源机构 | 中国科学院青藏高原研究所 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/260054 |
| 推荐引用方式 GB/T 7714 | Wang, Xin,Dettman, David L.,Wang, Mi,et al. Seasonal wet-dry variability of the Asian monsoon since the middle Pleistocene[J]. 中国科学院青藏高原研究所,2020,247. |
| APA | Wang, Xin.,Dettman, David L..,Wang, Mi.,Zhang, Jinhui.,Saito, Yoshiki.,...&Chen, Fahu.(2020).Seasonal wet-dry variability of the Asian monsoon since the middle Pleistocene.QUATERNARY SCIENCE REVIEWS,247. |
| MLA | Wang, Xin,et al."Seasonal wet-dry variability of the Asian monsoon since the middle Pleistocene".QUATERNARY SCIENCE REVIEWS 247(2020). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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