Lake Baikal isotope records of Holocene Central Asian precipitation
Lake Baikal isotope records of Holocene Central Asian precipitation
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全新世中亚降水的贝加尔湖同位素记录
DOI：
10.1016/j.quascirev.2018.04.013
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发表时间：
2018
影响因子：
4
通讯作者：
Swann G
中科院分区：
文献类型：
--
作者：
Swann G
气候模式目前对中亚地区未来气候变化的预测相互矛盾。考虑到可用水变化对整个地区社区和生态系统的潜在影响，需要了解降水的历史趋势，以帮助模型开发和评估该地区对未来水文气候变化的脆弱性。本文介绍了位于中亚西伯利亚南部靠近蒙古边境的贝加尔湖的记录，证明了20世纪和21世纪该地区硅藻二氧化硅（δ18Odiatom）氧同位素组成与降水之间的关系。由此，我们认为近年来的年降水量处于过去1万年来的最低水平，并确定了整个全新世早期至晚期降水的显著长期变化。根据与其他区域记录的比较，这些趋势反映了贝加尔湖周围更广泛的中亚地区的情况，并突出了未来气候变化导致降水进一步变化的可能性。
Climate models currently provide conflicting predictions of future climate change across Central Asia. With concern over the potential for a change in water availability to impact communities and ecosystems across the region, an understanding of historical trends in precipitation is required to aid model development and assess the vulnerability of the region to future changes in the hydroclimate. Here we present a record from Lake Baikal, located in the southern Siberian region of central Asia close to the Mongolian border, which demonstrates a relationship between the oxygen isotope composition of diatom silica (δ18Odiatom) and precipitation to the region over the 20th and 21st Century. From this, we suggest that annual rates of precipitation in recent times are at their lowest for the past 10,000 years and identify significant long-term variations in precipitation throughout the early to late Holocene interval. Based on comparisons to other regional records, these trends are suggested to reflect conditions across the wider Central Asian region around Lake Baikal and highlight the potential for further changes in precipitation with future climate change.