Speleothems of South American and Asian Monsoons Influenced by a Green Sahara
Speleothems of South American and Asian Monsoons Influenced by a Green Sahara
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受绿色撒哈拉沙漠影响的南美和亚洲季风的洞穴沉积
DOI：
10.1029/2020gl089695
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发表时间：
2020-11
影响因子：
5.2
通讯作者：
C. Tabor;B. Otto‐Bliesner;Zhengyu Liu
中科院分区：
文献类型：
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作者：
C. Tabor;B. Otto‐Bliesner;Zhengyu Liu
全新世中期经常被用于气候模型的代理比较研究，但模型往往难以复制这一时期的代理信号。在这里，我们使用一个追踪水同位素的地球系统模型来确定撒哈拉植被在模拟中全新世气候中的重要性，重点是南美和亚洲季风区洞穴中记录的δ18O值。我们发现，在中全新世期间，植被覆盖的撒哈拉沙漠导致了全球变暖，总体上放大了南美和亚洲季风区降水的δ18O值相对于工业化前的变化；这两个反馈都改善了模式代理协议。我们的结果强调了区域植被变化对于准确模拟过去气候的重要性，即使研究区域远离植被变化的源头。
The mid‐Holocene is frequently used for climate model‐proxy comparison studies, yet models often struggle to replicate the proxy signals from this period. Here, we use an Earth system model that tracks water isotopologies to determine the importance of a vegetated Sahara in the simulation of mid‐Holocene climate, with a focus on δ18O values recorded in speleothems from the South American and Asian monsoon regions. We find that inclusion of a vegetated Sahara during the mid‐Holocene leads to global warming and generally amplifies the changes in the δ18O values of the precipitation in the South American and Asian monsoon regions relative to preindustrial; both feedbacks improve model‐proxy agreement. Our results highlight the importance of regional vegetation alteration for accurate simulation of past climate, even when the region of study is far from the source of vegetation change.