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分析了研究区季风的形成、演变及其控制因素 ,指出强烈的盐度对比是在北印度洋占主导地位的季风气候系统的直接反映。通过位于孟加拉湾地区的 3支岩心 MD771 81、MD771 83和MD771 69的 δ1 8O值所反映的表层海水盐度变化的分析 ,认为研究区全新世及末次冰期—间冰期氧同位素第 3期西南季风强烈 ,末次冰期最盛期氧同位素第 2期西南季风微弱。通过与阿拉伯海等地区进行对比 ,进一步证明南亚季风的主要驱动因素是周期为 2 3 ka的低纬度太阳辐射。
The formation, evolution and controlling factors of the monsoon in the study area are analyzed. It is pointed out that the strong salinity contrast is a direct reflection of the monsoon climate system dominated in the North Indian Ocean. Based on the analysis of the changes of salinity of surface seawater reflected by the δ18O values of three cores MD771 81, MD771 83 and MD771 69 located in the Bay of Bengal, it is considered that the intense warmth of the 3rd Southwest Monsoon of the Holocene and the Last Glacial-Interglacial Oxygen Isotope in the study area , The second stage of the last glacial oxygen isotope of the southwest monsoon weakness. Compared with the Arabian Sea and other regions, it further proves that the main driving force of the South Asian monsoon is low-latitude solar radiation with a period of 23 ka.