Data for Chukchi Sea Ice and Primary Production

Arctic sea ice strongly influences climate and marine ecosystems, but its relationship with ocean productivity is not always direct. By analyzing chemical and biological indicators preserved in seafloor sediments, we reconstructed changes in sea ice and marine productivity in the central Chukchi Sea over the past ~8,000 years. Here we present a new multi-proxy sedimentary record from the central Chukchi Sea spanning the middle to late Holocene. We integrate IP₂₅, phytoplankton biomarkers, diatom assemblages, and biogenic silica to (i) reconstruct the millennial-scale evolution of sea-ice cover and primary productivity, (ii) evaluate the roles of Pacific Water inflow and summer insolation as boundary forcings, and (iii) assess the consistency and added sensitivity of the IP₂₅ signal relative to microfossil-based indicators. By explicitly examining the phase relationship between sea-ice variability and productivity, our study provides a pre-industrial benchmark and mechanistic constraints on how inflow-driven stratification and nutrient supply may shape future Arctic primary production and carbon cycling.北极海冰对气候与海洋生态系统具有强烈调控作用，但其与海洋生产力的关联并非始终直接。通过分析保存在海底沉积物中的化学与生物学指标，我们重建了过去约8000年楚科奇海中部海冰与海洋生产力的变化历史。 本文报道了一则采自楚科奇海中部、覆盖中全新世至晚全新世的新型多代理沉积记录。我们整合了IP₂₅、浮游植物生物标志物、硅藻组合与生物硅数据，以实现三大研究目标：（一）重建海冰覆盖与初级生产力的千年尺度演化历程；（二）评估太平洋入流与夏季日照辐射作为边界强迫因子的作用；（三）对比IP₂₅信号与基于微体化石的指标，分析其一致性与额外敏感性。通过明确探究海冰变异性与生产力之间的相位关系，本研究提供了工业前基准值，并为揭示入流驱动的层化作用与营养盐供给如何影响未来北极初级生产与碳循环提供了机制约束。