Orbital Asian summer monsoon dynamics revealed using an isotope- enabled global climate model
Orbital Asian summer monsoon dynamics revealed using an isotope- enabled global climate model
复制标题
DOI：
10.1038/ncomms6371
复制
发表时间：
2014-11-01
影响因子：
16.6
通讯作者：
Renssen, Hans
中科院分区：
文献类型：
--
作者：
Caley, Thibaut;Roche, Didier M.;Renssen, Hans
亚洲夏季风在轨道尺度上的动态是一个相当有争议的主题。亚洲洞穴三角洲O-18记录作为夏季风强度的替代指标的有效性以及季风的最终强迫和时间受到了质疑。这里，利用包括水同位素在内的15万年瞬变模拟的结果，我们证明了亚洲洞穴d18O记录不能仅在轨道时间尺度上有效地替代夏季风强度。相反，我们的结果表明，这些记录反映了印度支那地区大部分地区的水文过程和环流状况的年度变化。我们的结果支持了内部强迫的作用，例如赤道太平洋的海表面温度，以调节亚洲区域内古气候指标记录的季风降水的时间。
The Asian summer monsoon dynamics at the orbital scale are a subject of considerable debate. The validity of Asian speleothem delta O-18 records as a proxy for summer monsoon intensity is questioned together with the ultimate forcing and timing of the monsoon. Here, using the results of a 150,000-year transient simulation including water isotopes, we demonstrate that Asian speleothem d18O records are not a valid proxy for summer monsoon intensity only at the orbital timescale. Rather, our results show that these records reflect annual variations in hydrologic processes and circulation regime over a large part of the Indo-Asian region. Our results support the role of internal forcing, such as sea surface temperature in the equatorial Pacific, to modulate the timing of monsoon precipitation recorded in paleo-proxies inside the Asian region.