Strong Asymmetry of Interhemispheric Ice Volume During MIS 11, MIS 9, and MIS 7 Drives Heterogeneity of Interglacial Precipitation Intensity Over Asia
Strong Asymmetry of Interhemispheric Ice Volume During MIS 11, MIS 9, and MIS 7 Drives Heterogeneity of Interglacial Precipitation Intensity Over Asia
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DOI：
10.1029/2022gl100269
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发表时间：
2022-09
影响因子：
5.2
通讯作者：
Liangqing Cheng;Yubin Wu;Yougui Song;Linhai Yang;Xiaodong Miao;H. Sun;X. Qiang;Hong Chang;H. Long;Zhibao Dong
中科院分区：
文献类型：
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作者：
Liangqing Cheng;Yubin Wu;Yougui Song;Linhai Yang;Xiaodong Miao;H. Sun;X. Qiang;Hong Chang;H. Long;Zhibao Dong
深入了解过去间冰期的特征可以增强我们对当前暖期的理解，并改善对未来气候的预测。在这项研究中，我们分析了过去900 ka的降水记录，发现亚洲各地间冰期的降水强度各不相同，特别是在Brunhes中期过渡前后发生的间冰期之间。为了阐明间冰期降水强度变化的机制，我们利用中亚伊犁盆地最厚的黄土钻孔（202.49 m）记录了近900 ka的高分辨率风成记录，并利用Community Earth System Model 1.2.2进行模拟。认为伊犁黄土分选系数是反映风强度的敏感指标，它间接反映了北方冰量的变化。数值模拟实验的支持下，我们认为，强烈的不对称性的半球间的冰量在海洋同位素阶段11，9，和7驱动亚洲的间冰期降水强度的异质性。
Gaining insight into the characteristics of past interglacials enhances our understanding of the current warm period and improves predictions of future climate. In this study, we analyze precipitation records of the past 900 ka and find that precipitation intensity during interglacials varied across Asia, especially between interglacials that occurred before and after the mid‐Brunhes transition. To clarify the mechanism of precipitation intensity variation during interglacials, we present a high‐resolution eolian record documenting the past 900 ka, which is from the thickest loess core (202.49 m) drilled in Ili Basin, Central Asia and conduct modeling with Community Earth System Model 1.2.2. We propose that sorting coefficient of Ili loess is a sensitive proxy for wind intensity, and it indirectly reflects Northern Hemisphere ice volume. Supported by numerical modeling experiments, we suggest that strong asymmetry of interhemispheric ice volume during marine isotope stages 11, 9, and 7 drives heterogeneity of interglacial precipitation intensity over Asia.