Millennial-scale variations of the intermediate water in the South China Sea (SCS) have not been well understood due to limited data. Here we investigate the temperature and δO of seawater (δO, a proxy of salinity) evolution history of the intermediate water during the last deglaciation by analyzing Mg/Ca and oxygen isotopes of planktonic foraminifera in the southern SCS. The results indicate that intermediate water was warm and salty during the Heinrich 1 (H1) and Younger Dryas (YD) cold events, while it was cold and fresh during the Bølling-Alleød (B-A) warm event in the southern SCS. By comparison with other paleorecords, we find that there was a weak intrusion of the low-salinity intermediate water from the western Pacific into the SCS during H1 and YD, whereas the opposite occurred during the B-A. Our study reveals that the variability in the intrusion intensity of intermediate water into the SCS from the western Pacific was primarily influenced by the changes in winter wind intensity during the last deglaciation.

中文翻译：

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末次冰消期南海中层水入侵的变化

由于数据有限，南海中间水的千年尺度变化尚不清楚。本文通过分析南海南部浮游有孔虫的 Mg/Ca 和氧同位素，研究了末次冰消期中间水的温度和 δ18O（盐度的代表）演化历史。结果表明，南海南部海因里希1号（H1）和新仙女木（YD）寒冷事件期间，中间水是温暖和咸的，而伯林-阿勒德（BA）温暖事件期间，南海南部中间水是寒冷和新鲜的。通过与其他古记录的比较，我们发现H1和YD期间西太平洋低盐度中层水对南海的侵入较弱，而BA期间则相反。研究表明，西太平洋中间水侵入南海的强度变化主要受末次冰消期冬季风强度变化的影响。