Asian summer monsoonal variations during the Holocene revealed by Huguangyan maar lake sediment record
Asian summer monsoonal variations during the Holocene revealed by Huguangyan maar lake sediment record
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DOI：
10.1016/j.palaeo.2012.01.020
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发表时间：
2012-03
期刊：
影响因子：
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通讯作者：
Xudong Wu;Zhaohui Zhang;Xiaomei Xu;Ji Shen
中科院分区：
文献类型：
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作者：
Xudong Wu;Zhaohui Zhang;Xiaomei Xu;Ji Shen
全新世夏季风演变的高分辨率记录是重建古气候的必要条件，但很难获得。在这里，我们提供了一个连续的，良好的，高分辨率的记录，湖光岩玛珥湖位于西太平洋气候体制。利用叶绿素a、总有机碳、Sr/Rb比值和磁化率等多项指标重建了全新世季风变化。高叶绿素a值与强夏季风有关，反之亦然。高时间分辨率的放射性碳测年使我们能够划分夏季风的演变阶段。湛江地区夏季风在全新世早期最强，6080 yr BP开始减弱，3600 yr BP左右开始明显减弱。在我们的高分辨率测年支持下，大约6080年BP的转变比以前的估计滞后了约1700年。全新世30°N夏季太阳辐射的减少可能是夏季风逐渐减弱的原因。夏季风强度和ENSO活动在整个全新世的反相协变表明，它们可能是相互关联的，在轨道尺度上由太阳辐射共同驱动。
High-resolution records of summer monsoonal evolution in the Holocene are essential to paleoclimate reconstruction but are hard to obtain. Here we provide a continuous, well-dated, high-resolution record from Huguangyan maar lake located in the west Pacific climate regime. Multi-proxies including chlorophyll a, TOC, Sr/Rb ratio and magnetic susceptibility have been used to reconstruct the monsoon variations in the Holocene. Higher chlorophyll a values are related with stronger summer monsoon, and vice versa. High-temporal resolution radiocarbon dating enables us to divide summer monsoon evolution stages. Summer monsoon in Zhanjiang area was strongest in the early Holocene but began to decline at 6080yr BP, and weakened substantially since about 3600yr BP. The transition around 6080yr BP, supported by our high-resolution dating, lags the previous estimates by ~1700years. The decreasing summer solar radiation at 30°N through the Holocene is probably responsible for gradually weakened summer monsoon. The anti-phased co-variation of summer monsoon intensity and ENSO activity throughout the Holocene suggests that they could be interlinked, driven together by solar radiation at orbital scale.