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南海北部5万年来的表层海水盐度及东亚季风降水

, PP. 227-235

Keywords: 南海,Mg/Ca,浮游有孔虫,表层海水盐度,东亚季风

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Abstract:

为了探讨末次冰期以来南海北部区域降水变化对东亚夏季风强度变化的响应,利用南海北部191PC柱状样有孔虫壳体氧同位素和镁钙比值,重建了过去5万以来的表层海水温度和海水氧同位素变化。通过分析南海北部淡水收支的主要影响因素,认为夏季风降水是本研究站位海水盐度的主要影响因素,而海平面变化导致的冲淡效应变化并非主导因素。基于此前提,将剩余海水氧同位素作为区域降水变化的指标,结果表明,南海北部降水量与东亚季风强度在50~10kaB.P.间变化趋势较一致,10kaB.P.以来则呈相反的变化趋势。本文通过对比分析南海和西太平洋相关站位的古盐度变化、东亚陆地的干湿变化,结合数值模拟结果,认为50~10kaB.P.之间,北半球大陆冰盖对东亚夏季风的影响较强,东亚内陆和南海北部降水同时响应北半球高纬气温变化,表现出冷事件时降水少而暖事件时降水多的特点。而在10kaB.P.以来,南海北部和华南地区降水量与东亚季风强度变化趋势相反,表现出东亚-西北太平洋区域降水量分布的海陆差异特征。此现象与中全新世南北半球夏季辐射量不对称变化和海陆热容差异导致的温度、水汽重新分布有关。

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