Response of Westerly Jet Over the Northern Hemisphere to Astronomical Insolation During the Holocene
Response of Westerly Jet Over the Northern Hemisphere to Astronomical Insolation During the Holocene
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DOI：
10.3389/feart.2020.00282
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发表时间：
2020-07
期刊：
影响因子：
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通讯作者：
P. Zhou;Zhengguo Shi;Xinzhou Li;Weijian Zhou
中科院分区：
文献类型：
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作者：
P. Zhou;Zhengguo Shi;Xinzhou Li;Weijian Zhou
对流层高层西风急流是一种重要的大气环流系统，它的南北迁移和强度变化对全球气候有重要影响。然而，它的变化在整个欧亚大陆和北美地区的全新世没有得到很好的评价，这限制了我们对这些地区的气候变化的理解。本文利用大气环流模式试验，模拟了近10 ka来WJ的变化，揭示了WJ的强度和位置对天文日射的响应。结果表明，全新世早期至晚期，夏季WJ逐渐向南迁移，在中亚、日本和北美地区增强;冬季WJ位置基本不变，强度变化不大。这些季节性的不对称变化可以归因于温度结构，其中地面潜热和感热通量都有贡献。
The westerly jet (WJ) in the upper troposphere, an important atmospheric circulation system, is critical for influencing global climate by changes of its north–south migration and intensity. However, its variations during the Holocene across the Eurasian and North America are not well evaluated, which restricts our understanding of climate change in those regions. Using general circulation model experiments, here we simulate the variations of WJ over the past 10 ka to show its intensity and position of WJ responding to astronomical insolation. Our results suggest that the summer WJ gradually migrates southward and strengthens over the Central Asia (CA), Japan, and North America from the early Holocene (EH) to late Holocene (LH); meanwhile, the positions of the winter WJ barely move and its intensity slightly change. These seasonally asymmetric changes can be attributed to the temperature structure, in which the surface latent and sensible heat flux both contribute.