We present the analysis of global sympagic primary production (PP) from 300 years of pre-industrial and historical simulations of the E3SMv1.1-BGC model. The model includes a novel, eight-element sea ice biogeochemical component, MPAS-Seaice zbgc, which is resolved in three spatial dimensions and uses a vertical transport scheme based on internal brine dynamics. Modeled ice algal chlorophyll-a concentrations and column-integrated values are broadly consistent with observations, though chl-a profile fractions indicate that upper ice communities of the Southern Ocean are underestimated. Simulations of polar integrated sea ice PP support the lower bound in published estimates for both polar regions with mean Arctic values of 7.5 and 15.5 TgC/a in the Southern Ocean. However, comparisons of the polar climate state with observations, using a maximal bound for ice algal growth rates, suggest that the Arctic lower bound is a significant underestimation driven by biases in ocean surface nitrate, and that correction of these biases supports as much as 60.7 TgC/a of net Arctic PP. Simulated Southern Ocean sympagic PP is predominantly light-limited, and regional patterns, particularly in the coastal high production band, are found to be negatively correlated with snow thickness.

中文翻译：

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使用 E3SMv1.1-BGC 调查对海冰藻生产的控制

我们从 E3SMv1.1-BGC 模型的 300 年工业化前和历史模拟中对全球同源初级生产 (PP) 进行了分析。该模型包括一个新颖的八元素海冰生物地球化学成分 MPAS-Seaice zbgc，它在三个空间维度上进行解析，并使用基于内部盐水动力学的垂直传输方案。模拟的冰藻叶绿素-a 浓度和柱积分值与观察结果大致一致，尽管 chl-a 剖面分数表明南大洋的上层冰群落被低估了。极地综合海冰 PP 的模拟支持已发表的两个极地地区估计值的下限，南大洋的北极平均值为 7.5 和 15.5 TgC/a。然而，将极地气候状态与观测结果进行比较，使用冰藻生长速率的最大界限，表明北极下限是由海洋表面硝酸盐的偏差驱动的显着低估，并且这些偏差的校正支持高达 60.7 TgC/a 的净北极 PP。模拟的南大洋同域 PP 主要受光限制，并且发现区域模式，特别是在沿海高产带中，与积雪厚度呈负相关。