Many different atmospheric trace gases have been directly and indirectly linked to biological sources and sinks. Here we assess how atmospheric mixing ratios of a range of halocarbons (CH₃Br, CH₂Br₂, CHBr₃, CH₃Cl, CHCl₃, and CH₃I) and COS are causally connected to naturally occurring marine eukaryotic phytoplankton in coastal Southern California. We use a self-organizing map to characterize the abiotic environment and empirical dynamic modeling with convergent cross mapping to identify causal interactions between multiple in situ 8-year time-series, sampled at the Ellen Browning Scripps Pier at Scripps Institution of Oceanography. Our work supports previous findings that halocarbon production is found in a variety of marine phytoplankton taxa and suggests that local phytoplankton may have the ability to affect changes in the mixing ratios of halocarbons in nearshore environments. There were notable links between changes in CH₃I and several different diatom taxa and between changes in CHCl₃ and a group of phytoplankton during specific ecosystem states. Our results suggest that both seasonal and non-seasonal shifts in eukaryotic phytoplankton structure contribute to small fluctuations in atmospheric halocarbon mixing ratios that exhibit strong seasonality and may occasionally play a larger role in atmospheric mixing ratios of halocarbons that display reduced seasonality.

许多不同的大气痕量气体已直接和间接地与生物源和汇联系在一起。在这里，我们评估了一系列卤代烃（CH ₃ Br，CH ₂ Br ₂，CHBr ₃，CH ₃ Cl，CHCl ₃和CH ₃ I）和COS的大气混合比率如何与沿海自然形成的海洋真核浮游植物成因果关系加州南部。我们使用自组织图来描述非生物环境的特征，并使用会聚交叉映射法进行经验动态建模以识别多个原位之间的因果关系8年时间序列，在斯克里普斯海洋学研究所的艾伦·布朗宁斯克里普斯码头采样。我们的工作支持先前的发现，即在各种海洋浮游植物类群中发现了卤化碳的产生，并表明当地的浮游生物可能具有影响近岸环境中卤化碳混合比变化的能力。CH ₃ I和几种不同的硅藻类群之间的变化与CHCl _3的变化之间存在显着的联系以及在特定生态系统状态下的一组浮游植物。我们的结果表明，真核浮游植物结构的季节性和非季节性变化都有助于表现出强烈季节性的大气卤代烃混合比的小幅波动，并且偶尔会在季节性降低的卤代烃的大气混合比中发挥更大的作用。