East Asian Monsoon History and Paleoceanography of the Japan Sea Over the Last 460,000 Years
East Asian Monsoon History and Paleoceanography of the Japan Sea Over the Last 460,000 Years
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DOI：
10.1029/2018pa003331
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发表时间：
2018-07
影响因子：
3.5
通讯作者：
S. Gallagher;T. Sagawa;A. Henderson;M. Saavedra‐Pellitero;D. De Vleeschouwer;H. Black;T. Itaki;S. Toucanne;M. Bassetti;S. Clemens;W. Anderson;C. Alvarez‐Zarikian;R. Tada
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文献类型：
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作者：
S. Gallagher;T. Sagawa;A. Henderson;M. Saavedra‐Pellitero;D. De Vleeschouwer;H. Black;T. Itaki;S. Toucanne;M. Bassetti;S. Clemens;W. Anderson;C. Alvarez‐Zarikian;R. Tada
日本海直接受到亚洲季风的影响，亚洲季风是一个在北半球夏季将水分和热量输送到东南亚的系统，是地球海洋大气环流的主要驱动力。对来自日本海综合大洋钻探计划考察346站点U1427的460 kyr记录的有孔虫和相分析揭示了由于海平面和东亚季风强度而变化的营养通量和氧化记录。东亚夏季风在海洋同位素阶段（MIS）5e、MIS 7 e、MIS 9 e和MIS 11 c最强烈，此时对马暖流流入无限制的混合良好的正常盐度日本海，而东亚冬季风（EAWM）条件主导MIS 2、MIS 4、MIS 6，和MIS 8，当海平面极小值限制日本海时，在没有Tsushima流的情况下导致低盐度和氧气条件。当东海沿岸沃茨突破对马海峡时，终端TV、TIII、TII和TI的特征是氧分层减少、低盐度和较高生产力的海洋条件。中国的黄土，洞穴，和日本的琵琶湖（日本）和U1427代理记录表明，东亚夏季风在低到高的日照过渡加强，而最强的EAWM盛行在最低的日照期间或高到低的日照过渡。冰盖/CO2强迫导致最强的EAWM事件在冰川和增强EASM在间冰期。代理模式之间的不匹配表明，纬度和陆地/海洋热对比在东亚季风变化中发挥了作用，这表明冰盖动态，日照和热梯度之间的复杂相互作用控制季风强度。
The Japan Sea is directly influenced by the Asian monsoon, a system that transports moisture and heat across southeast Asia during the boreal summer, and is a major driver of the Earth's ocean‐atmospheric circulation. Foraminiferal and facies analyses of a 460‐kyr record from Integrated Ocean Drilling Program Expedition 346 Site U1427 in the Japan Sea reveal a record of nutrient flux and oxygenation that varied due to sea level and East Asian monsoon intensity. The East Asian summer monsoon (EASM) was most intense during marine isotope stage (MIS) 5e, MIS 7e, MIS 9e, and MIS 11c when the Tsushima Warm Current flowed into an unrestricted well‐mixed normal salinity Japan Sea, whereas East Asian winter monsoon (EAWM) conditions dominated MIS 2, MIS 4, MIS 6, and MIS 8 when sea level minima restricted the Japan Sea resulting in low‐salinity and oxygen conditions in the absence of Tsushima flow. Reduced oxygen stratified, low‐salinity, and higher productivity oceanic conditions characterize Terminations TV, TIII, TII, and TI when East China Sea coastal waters breached the Tsushima Strait. Chinese loess, cave, and Lake Biwa (Japan) and U1427 proxy records suggest EASM intensification during low to high insolation transitions, whereas the strongest EAWM prevailed during lowest insolation periods or high to low insolation transitions. Ice sheet/CO2 forcing leads to the strongest EAWM events in glacials and enhanced EASM in interglacials. Mismatches between proxy patterns suggest that latitudinal and land/sea thermal contrasts played a role in East Asian monsoon variability, suggesting that a complex interplay between ice sheet dynamics, insolation, and thermal gradients controls monsoonal intensity.