Abstract Climate of the eastern Arabian Sea is highly influenced by both global climate and Indian monsoon. We produced multi-proxy records of benthic foraminiferal biofacies and stable isotope ratio (δ13C and δ18O), planktic foraminifera and total organic carbon (wt%) content of sediments from core SK291/GC11 in the upper continental shelf off Mangalore, off eastern Arabian Sea (EAS) to decipher paleoenvironmental and paleoclimatic changes during the past ~23,000 years. The monsoon was weak during the Last Glacial Maximum ~23,000–18,000 calibrated years before Present (cal yr BP) when sea level was lower. Globigerinoides ruber populations fluctuate from 30 to 60% in the studied interval with a maximum during ~6000–5000 cal yr BP and a minimum during 19,000–17,000 cal yr BP. The δ18O values of benthic foraminifer Ammonia gaimardii suggest pronounced cooling phases during ~23,000–18,000 cal yr BP, and a short-term cooling at ~6000 cal yr BP. Several intervals of high organic productivity and low oxygen conditions were identified based on benthic foraminiferal biofacies during 23,247–682 cal yr BP. Wind-induced surface mixing was intense during 3200–530 cal yr BP as evidenced by high Globigerina bulloides abundances. The core was affected by moderate chemical weathering and solar variability appears to have been an important forcing factor in shaping climate of the region.

中文翻译：

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阿拉伯海东部 23000 年前的古气候和环境变化记录

摘要 阿拉伯海东部气候受全球气候和印度季风影响较大。我们生成了底栖有孔虫生物相和稳定同位素比（δ13C 和 δ18O）、浮游有孔虫和来自阿拉伯海东部芒格洛尔上陆架上部 SK291/GC11 核心沉积物的总有机碳（wt%）含量的多代理记录(EAS) 来破译过去约 23,000 年的古环境和古气候变化。当海平面较低时，季风在现在（cal yr BP）之前的最后一次冰川最大值约23,000-18,000校准年期间很弱。Globigerinoides ruber 种群在研究区间内从 30% 到 60% 波动，最大值在~6000-5000 cal yr BP 期间，最小值在19,000-17,000 cal yr BP 期间。底栖有孔虫 Ammonia gaimardii 的 δ18O 值表明在~23,000-18,000 cal yr BP 期间存在明显的冷却阶段，并且在~6000 cal yr BP 期间出现短期冷却。在 23,247-682 cal BP 期间，根据底栖有孔虫生物相确定了几个高有机生产力和低氧条件的间隔。高 Globigerina Bulloides 丰度证明了在 3200-530 cal BP 期间，风引起的表面混合是强烈的。核心受到适度化学风化的影响，太阳变化似乎是塑造该地区气候的重要推动因素。247–682 cal yr BP。高 Globigerina bulloides 丰度证明了在 3200-530 cal BP 期间，风引起的表面混合是强烈的。核心受到适度化学风化的影响，太阳变化似乎是塑造该地区气候的重要推动因素。247–682 cal yr BP。高 Globigerina Bulloides 丰度证明了在 3200-530 cal BP 期间，风引起的表面混合是强烈的。核心受到适度化学风化的影响，太阳变化似乎是塑造该地区气候的重要推动因素。