Mid-Holocene Northern Hemisphere warming driven by Arctic amplification
Mid-Holocene Northern Hemisphere warming driven by Arctic amplification
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DOI：
10.1126/sciadv.aax8203
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发表时间：
2019-12
期刊：
影响因子：
13.6
通讯作者：
Hyo‐Seok Park;Seong‐Joong Kim;A. Stewart;S. Son;K. Seo
中科院分区：
文献类型：
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作者：
Hyo‐Seok Park;Seong‐Joong Kim;A. Stewart;S. Son;K. Seo
对全新世中期气候模式集合和古代理的分析表明，全新世中期北半球是温暖的。全新世最热的特点是强烈的夏季太阳加热，相对于工业化前的气候大幅提高了夏季温度。然而，夏季变暖被冬季日照减弱所补偿，全新世最热年平均温度仍然不明确。使用全新世中期的多模型模拟，我们表明北半球年平均温度与北极放大程度和海冰损失密切相关。其他模型实验表明，夏季北极海冰流失持续到冬季，并增加了中高纬度地区的气温。这些结果根据四个代理数据集进行评估，以验证全新世中期北部高纬度地区的年平均气温比工业化前的气候更温暖，这是由于北极放大驱动的季节性校正温度上升。这项研究为“全新世温度难题”提供了解决方案，这是全新世最热的古代理与气候模型模拟之间众所周知的差异。
Analyses of a mid-Holocene climate model ensemble and paleo-proxies reveal that the mid-Holocene Northern Hemisphere was warm. The Holocene thermal maximum was characterized by strong summer solar heating that substantially increased the summertime temperature relative to preindustrial climate. However, the summer warming was compensated by weaker winter insolation, and the annual mean temperature of the Holocene thermal maximum remains ambiguous. Using multimodel mid-Holocene simulations, we show that the annual mean Northern Hemisphere temperature is strongly correlated with the degree of Arctic amplification and sea ice loss. Additional model experiments show that the summer Arctic sea ice loss persists into winter and increases the mid- and high-latitude temperatures. These results are evaluated against four proxy datasets to verify that the annual mean northern high-latitude temperature during the mid-Holocene was warmer than the preindustrial climate, because of the seasonally rectified temperature increase driven by the Arctic amplification. This study offers a resolution to the “Holocene temperature conundrum”, a well-known discrepancy between paleo-proxies and climate model simulations of Holocene thermal maximum.