During each summer monsoon, the northeastern Indian Ocean receives a huge amount of rain and river discharge, resulting in strong stratification and prevalence of oligotrophic conditions. These water column changes impact upper ocean productivity which is reflected in the planktonic foraminifera distribution, providing an opportunity to study the effect of monsoon forcing and stratification history. Analogous to modern‐day stratification, very intense water column stratification and productivity collapse were observed associated with Indian summer monsoon (ISM) evolution. This paper reports significant stratification events during MIS 3 (37.0 to 33 and 27 to 24 cal ka), Bølling/Allerød (B/A), early Holocene (10.0 to 8.0 cal ka) and mid‐Holocene (7.0 to 5.0 cal ka) which slowly muted upwelling and productivity. The deglacial intensification of the ISM started in the early stages of the Bølling/Allerød (B/A) followed by slight weakening during the Younger Dryas and regained strength during the early Holocene, coinciding with the highest summer insolation at 30°N. A progressive decline in the abundances of productivity and salinity proxies from 4.2 to 2.0 cal ka suggests a gradual weakening of the ISM. The late Quaternary productivity variations in the Bay of Bengal and the Andaman Sea are primarily controlled by salinity‐related stratification.

中文翻译：

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印度夏季风引起的第四纪晚期第四纪记录和安达曼海的生产力崩溃

在每个夏季风期间，东北印度洋都会收到大量的雨水和河流排泄物，从而导致强烈的分层和贫营养状况的普遍发生。这些水柱变化影响上层海洋生产力，这反映在浮游有孔虫的分布中，为研究季风强迫和分层历史的影响提供了机会。与现代分层相似，与印度夏季风（ISM）演化有关的水柱分层和生产力崩溃也很严重。本文报告了在MIS 3（37.0至33和27至24 cal ka），Bølling/Allerød（B / A），早全新世（10.0至8.0 cal ka）和全新世中期（7.0至5.0 cal ka）期间发生的重大分层事件。慢慢使上升流和生产力减弱。ISM的冰期增强始于Bølling/Allerød（B / A）的早期阶段，随后在Younger Dryas时期略有减弱，并在全新世早期恢复了强度，这与30°N的夏季最高日照强度相吻合。生产率和盐分含量的丰度从4.2千卡逐渐下降到2.0千卡，表明ISM逐渐减弱。孟加拉湾和安达曼海的第四纪晚期生产力变化主要受与盐度有关的分层控制。0 cal ka表示ISM逐渐减弱。孟加拉湾和安达曼海的第四纪晚期生产力变化主要受与盐度有关的分层控制。0 cal ka表示ISM逐渐减弱。孟加拉湾和安达曼海的第四纪晚期生产力变化主要受与盐度有关的分层控制。