The Arabian Sea Oxygen Minimum Zone (OMZ) is one of the most intense of the world ocean OMZs witnessing denitrification, hence, has implications to global climate. In order to understand the Holocene variations in the OMZ of this region, a sediment core (BP3-GCR3) from a water depth of 500 m was retrieved, which is presently swept by nearly anoxic waters of the core of the OMZ. The sedimentary oxide-bound Mn, a reliable redox proxy, exhibits a gradual decrease from ∼14 ppm during the early-Holocene to ∼8 ppm during the late-Holocene, suggesting a relatively less intense OMZ during the former period. The concentration of a suite of other redox-sensitive elements (Fe, Co and Ce) associated with the dispersed sedimentary oxide particulates also show a gradual and coherent decrease through the Holocene suggesting reduction of dissolved oxygen (DO) in the core of the OMZ towards the modern times. This intensification of OMZ seems to be a result of increased export production coupled with decreasing ventilation of thermocline waters through the Holocene. A one-time positive shift is observed at ∼5.5 ka BP in the organic carbon content (OC) from ∼2 % to ∼10 % in core-top. This shift in OC content is also marked by rapid decrease of CaCO₃ by ∼20 %, suggesting enhanced carbonate dissolution due to increased anoxia in the OMZ core caused by increased export production in the late Holocene.

阿拉伯海氧气最低限度区域（OMZ）是世界海洋中最强的反硝化区域之一，因此对全球气候有影响。为了了解该地区OMZ的全新世变化，从水深500 m处取回了一个沉积岩心（BP3-GCR3），目前该沉积物岩心被OMZ岩心的近缺氧水所淹没。沉积氧化物结合的Mn是一种可靠的氧化还原替代物，从全新世初期的〜14 ppm逐渐降低到全新世后期的〜8 ppm，逐渐降低，这表明前一时期的OMZ强度相对较低。一组其他氧化还原敏感元素（Fe，Co和Ce）与分散的沉积氧化物颗粒相关联，在整个全新世期间也显示出逐渐而连贯的下降，表明在近代以来OMZ核心中的溶解氧（DO）减少了。OMZ的加剧似乎是出口生产增加的结果，以及通过全新世的温跃层水的通风减少所致。在约5.5 ka BP处，芯顶有机碳含量（OC）从约2％到约10％发生了一次正向位移。OC含量的这种变化也以CaCO的迅速减少为特征 核心顶部的有机碳含量（OC）为5 ka BP，从约2％到约10％。OC含量的这种变化也以CaCO的迅速减少为特征 核心顶部的有机碳含量（OC）为5 ka BP，从约2％到约10％。OC含量的这种变化也以CaCO的迅速减少为特征₃约为20％，这表明由于全新世晚期出口产品产量增加导致OMZ核心缺氧增加，碳酸盐溶解增加。