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古里雅冰芯记录、青藏高原和其北侧的高湖面记录、植被变化记录指示 40～ 30kaBP即末次冰期间冰阶或深海氧同位素 3阶段后期 .青藏高原异常的温暖湿润 ,温度高于现代 2～4℃ ,降水有 4成至成倍以上的增长 ,代表着一次特强的夏季风事件 ,推测其动力一方面为高原夏季低气压强盛 ,增大了对夏季风的吸引力 ;另一方面热带洋面的旺盛蒸发 ,助长了西南季风携带丰富水汽吹越青藏高原 .特强夏季风形成背景是 40～ 30kaBP正值 2 0ka左右岁差周期的太阳高辐射阶段 ,青藏高原接受的辐射增强加大了高原与印度洋中南部的热力对比
Records of the Guli ice core, records of the Qinghai-Xizang Plateau and its northern high lake, and records of vegetation changes indicate 40-30 ka BP, ie, the third-stage of the ice or deep-sea oxygen isotope during the last ice period.The Tibetan Plateau is exceptionally warm and humid with a higher temperature than the modern 2 ~ 4 ℃, precipitation 4% to more than doubling the growth, representing a particularly strong summer monsoon event, speculated that the momentum of the plateau in the summer on the one hand the strong low pressure, increasing the attractiveness of the summer monsoon; the other hand The intense evaporation of the tropical oceans contributed to the southwester monsoon carrying abundant water vapor over the Tibetan Plateau.The background of the special strong summer monsoon is the high solar radiation period with a precession period of about 20 ka at 40 ~ 30ka BP, and the radiation intensification received by the Qinghai-Tibet Plateau is increased Thermodynamic contrast between the plateau and central and southern Indian Ocean