Strengthened East Asian Winter Monsoon Regulated by Insolation and Arctic Sea Ice Since the Middle Holocene
Strengthened East Asian Winter Monsoon Regulated by Insolation and Arctic Sea Ice Since the Middle Holocene
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DOI：
10.1029/2023gl105440
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发表时间：
2023-11
影响因子：
5.2
通讯作者：
Peng Zhou;Xinzhou Li;Zhengguo Shi;Y. Sha;J. Lei;Zhisheng An
中科院分区：
文献类型：
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作者：
Peng Zhou;Xinzhou Li;Zhengguo Shi;Y. Sha;J. Lei;Zhisheng An
东亚冬季风（EAWM）是亚洲重要的气候系统，具有重要的社会和经济影响。然而，EAWM在全新世期间的轨道尺度变化及其相关机制仍然没有完全了解。基于一个耦合气候模式的高分辨率瞬态模拟，我们在这里提出了一个连续的气候演变的EAWM响应轨道强迫。我们模拟的春季EAWM变化与黄土的粒度记录一致，自中全新世以来表现出明显的加强趋势。在冬季，也模拟了类似的增加趋势，但统计上不显着。研究结果表明，全新世东亚冬季风基本上是由高、低纬度纬纬向温度梯度控制的。除了北方太阳辐射强迫外，北极海冰和欧亚雪盖的反馈也对南北向温度梯度产生了调节作用，这表明它们对全新世东亚冬季风的演化起着重要的驱动作用。
The East Asian winter monsoon (EAWM) is a crucial climate system in Asia, with significant social and economic impacts. Orbital‐scale variability of the EAWM during the Holocene and its associated mechanisms, however, are still not fully understood. Based on a high‐resolution transient simulation by a coupled climate model, we present here a continuous climate evolution of the EAWM in response to orbital forcing. Our simulated springtime EAWM variations, consistent with grain size records of loess, exhibit an obvious strengthening trend since the mid‐Holocene. In winter, a similar increasing trend is also simulated although not statistically significant. Our results suggest that the Holocene EAWM is basically controlled by meridional temperature gradients between high and low latitudes in both seasons. Other than northern insolation forcing, the feedbacks from Arctic sea ice and Eurasian snow cover also modulate the meridional temperature gradients, highlighting their important roles in driving EAWM evolution during the Holocene.