九州台古土壤S_1记录的末次间冰期东亚夏季风变化  

EASTERN ASIAN SUMMER MONSOON VARIATION DURING MIS5e AS RECORDED BY PALEOSOL S_(1) AT JIUZHOUTAI LOESS SECTION

作　　者：饶志国[1] 陈发虎[1] 汪海斌[2] 张家武[1] 朱照宇[3] 

机构地区：[1]兰州大学西部环境教育部重点实验室中德干旱环境联合研究中心,兰州730000 [2]北京师范大学资源学院,北京100875 [3]中国科学院边缘海地质重点实验室,广州510640

出　　处：《海洋地质与第四纪地质》2006年第2期103-111,共9页Marine Geology & Quaternary Geology

基　　金：国家自然科学杰出青年基金项目(40125001);科技部重点国际合作项目(2002CB714004);教育部博士点基金(20020730010)

摘　　要：对沉积速率较高的黄土高原西部地区九州台剖面S1古土壤的夏季风代用指标———磁化率、碳酸钙含量、色度进行了测量。综合分析结果表明,MIS5e开始前,夏季风有一次衰退事件,末次盛间冰期早期夏季风强于晚期,而中期夏季风强度相对较弱,然而这种变化是较为和缓的,并没有表现出类似GRIP冰心氧同位素的大幅度、快速变化,表明MIS5e期间东亚夏季风是相对稳定的。来自海洋的研究表明,西太平洋洋面温度(SST)和洋面高度在MIS5e早期和晚期相对较高,中期相对较低,证实了西太平洋环境变化和东亚夏季风强度之间存在成因上的联系。与先前有关全新世东亚夏季风研究结果的对比表明,MIS5e和全新世东亚夏季风演化具有一定的相似性,可能反映了低纬海洋和高纬大陆之间能量和物质交换对太阳辐射响应的某种内在机制。Proxies of the Eastern Asian Summer Monsoon （EASM）-magnetic susceptibility depending on frequency, carbonate content and soil color of paleosol S1 of Jiuzhoutai loess-paleosol profile whose accumulative rate is high and which is located in western Chinese Loess Plateau have been measured. Synthesis analysis of the obtained data deduced a decline event of EASM at the beginning of MISSe, and then the intensity of EASM increased quickly until the last interglacial. Early MISSe EASM is stronger than the late MIS5e one, and the middle MISSe is the weakest. The gentle change of MISSe EASM has no characters of the abrupt change of GRIP oxygen isotope, suggesting the EASM is relative stable during MISSe. The surface sea temperature and sea level in the west part of the Pacific is relatively high during early and late MISSe and relatively low during middle MISSe, consistent with the change of EASM, meaning that environmental change of the west part of the Pacific partly controlled the change of the EASM. Previous studies on Holocene EASM suggested that early Holocene EASM is stronger than late Holocene one, and middle Holocene is relatively dry. The same character of EASM change of MIS5e and Holocene may reveal the inherence mechanism of EASM change.

关 键 词：东亚夏季风 末次间冰期 全新世 九州台古土壤 

分 类 号：P532[天文地球—古生物学与地层学]