This paper reconstructs the relative sea level (RSL) and palaeoclimate of the northern coasts of the Persian Gulf (PG) during the last 16 centuries using physiochemical and ecological proxies from a radiocarbon-dated sediment core from the Nayband Bay (NB) estuary. The results show that between 1600 and 1150 cal yr BP, the NB was a marine lagoon with high river discharge, indicated by low organic matter content sandy silt sediments, high foraminiferal abundance (7900 tests per 10 cm³), and balanced agglutinated and hyaline taxa. During the Medieval Warm Period, the NB became a shallow lagoon, and consequently, a playa with high eolian input and low river discharge formed in the studied site that extended until 500 cal. yr BP. This condition is indicated by sediment finning trend, elevated magnetic susceptibility in sandy mud sediments, and low foraminiferal frequency dominated by hyaline taxa (mainly opportunist Ammonia beccarii). During the stillstand condition corresponding to 500–250 cal yr BP, the evolution of tidal channels in the area provided a platform for developing the upcoming mangrove habitat. In the last 250 years, RSL in the north of NB dropped enough to create a low-energy intertidal flat sheltered by a sandbar, which allowed mangrove growth. We conclude that the ecological and sedimentological evolution of the shallow marginal NB is mainly driven by eustatic RSL decline superimposed by local uplift. We suggest that the current orbitally-induced increasing insolation trend, enhanced by human-induced global warming, could increase aridity in the PG and the southern Zagros.

本文利用奈班德湾(NB) 河口放射性碳测年沉积岩芯的物理化学和生态指标重建了过去 16 世纪波斯湾北部海岸 (PG) 的相对海平面 (RSL) 和古气候。结果表明，在1600-1150cal yr BP之间，NB是一个河流流量高的海洋泻湖，表现为有机质含量低的砂质粉砂沉积物，有孔虫丰度高（7900个/10cm ³ ），以及平衡的凝集和透明类群。在中世纪温暖时期，NB 变成了一个浅泻湖，因此，在研究地点形成了风成输入高、河流流量低的普拉亚，一直延伸到 500 cal。年血压。这种情况的表现是沉积物鳍状化趋势、砂泥沉积物中磁化率升高以及以透明类群（主要是机会性氨藻）为主的有孔虫频率低。在相当于500-250cal yr BP的静止状态期间，该地区潮汐通道的演变为即将到来的红树林栖息地的发展提供了平台。在过去的 250 年里，新布伦茨北部的 RSL 下降得足够多，形成了一个由沙洲遮蔽的低能量潮间带，使红树林得以生长。我们得出的结论是，NB浅部边缘的生态和沉积演化主要是由海平面RSL下降和局部抬升叠加驱动的。我们认为，当前轨道引起的日照增加趋势，加上人为引起的全球变暖，可能会加剧PG和扎格罗斯南部的干旱。