Chinese cave delta O-18 records do not represent northern East Asian summer monsoon rainfall
Chinese cave delta O-18 records do not represent northern East Asian summer monsoon rainfall
复制标题
中国洞穴三角洲O-18记录并不代表东亚北部夏季季风降雨
DOI：
10.1073/pnas.1703471114
复制
发表时间：
2017
影响因子：
11.1
通讯作者：
Chen Fahu
中科院分区：
文献类型：
--
作者：
Liu Jianbao;Chen Shengqian;Chen Jianhui;Zhang Zhiping;Chen Fahu
In a recent study, Goldsmith et al. reconstructed the Holocene lake-level history of Lake Dali in Inner Mongolia from fossil beach ridges and assume it reflected East Asian summer monsoon (EASM) rainfall (1). In addition, they note a good correlation between the lake fluctuations and Chinese speleothem δ18O records, and therefore conclude that Chinese δ18O records could be used to represent the monsoonal rainfall of northern China. However, to draw these conclusions, it is necessary to consider factors such as lake hydrology, water source, and the evidence of other extant EASM rainfall records in northern China.In fact, the level of Lake Dali was not controlled solely by monsoonal rainfall because it was also fed by snow/ice melt from the Da Hinggan Range (2). For example, previous studies have demonstrated that Lake Dali reached a highstand in the early Holocene as a result of snow/ice melt input rather than monsoonal rainfall, whereas the highest lake level occurred in the mid-Holocene, which indicates the strongest EASM rainfall (3). This view is further supported by the evidence of a mid-Holocene rainfall maximum from a high-resolution, pollen-based annual precipitation record from a sediment core from Lake Dali (4)(Fig. 1E). Therefore, the Dali lake level record is not an unambiguous indicator of EASM rainfall. Moreover, Chen et al.(5) produced a well-dated,∼ 20-y-resolution, pollen-based precipitation record from an alpine lake in northern China spanning the last 14.7 ka, which indicated that the EASM maximum occurred during the mid-Holocene (Fig. 1C). This record, together with the record of paleosol development synthesized from Loess sections (Fig. 1G) and aeolian deposits (Fig. 1F) in northern China, as well as all of the other existing EASM rainfall records from
