Abstract. We investigate in which ways marine biologically-mediated heating increases the surface atmospheric temperature. While the effects of phytoplankton light absorption on the ocean have gained attention over the past years, the impact of this biogeophysical mechanism on the atmosphere is still unclear. Phytoplankton light absorption warms the surface of the ocean with consequences for the air-sea heat exchange and CO₂ flux. We focus on the ocean-atmosphere interface and study the importance of air-sea heat exchange versus air-sea CO₂ flux. To shed light on the role of phytoplankton light absorption on the surface atmospheric temperature, we performed different simulations with the EcoGENIE Earth system model. We configure the model without a seasonal cycle and, if not stated otherwise, the atmospheric CO₂ concentration is allowed to evolve freely. The climate pathways examined are: heat exchange, dissolved CO₂, solubility of CO₂, and sea-ice covered area. Overall we show that the air-sea CO₂ exchange has a larger effect on the biologically-induced atmospheric warming than the air-sea heat flux. Moreover, we notice that the freely evolving solubility of CO₂ has a cooling effect on the surface atmospheric temperature.

中文翻译：

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浮游植物引起的大气变暖背后的气候途径

摘要。我们研究了海洋生物介导的加热以哪些方式增加了地表大气温度。虽然浮游植物光吸收对海洋的影响在过去几年中受到关注，但这种生物地球物理机制对大气的影响仍不清楚。浮游植物的光吸收使海洋表面变暖，从而对海气热交换和 CO ₂通量产生影响。我们专注于海洋 - 大气界面，并研究海气热交换与海气 CO ₂的重要性通量。为了阐明浮游植物光吸收对地表大气温度的作用，我们使用 EcoGENIE 地球系统模型进行了不同的模拟。我们在没有季节性周期的情况下配置模型，如果没有另外说明，允许大气 CO ₂浓度自由演变。检查的气候途径是：热交换，溶解的CO ₂，CO的溶解度₂，和海冰覆盖的区域。总的来说，我们表明海气 CO ₂交换对生物诱导的大气变暖的影响比海气热通量更大。此外，我们注意到 CO ₂自由演化的溶解度对地表大气温度具有冷却作用。