Acclimation of phytoplankton Fe:C ratios dampens the biogeochemical response to varying atmospheric deposition of soluble iron

Dissolved iron (dFe) plays an important role in regulating marine biological productivity. In high-nutrient, low-chlorophyll regions (> 33% of the global ocean) iron is the primary growth-limiting nutrient, and elsewhere iron can regulate nitrogen fixation and growth by diazotrophs. The link between iron availability and carbon export is strongly dependent on the phytoplankton iron quotas, or cellular Fe:C ratios. This ratio can vary by more than an order of magnitude in the open ocean and is positively correlated with ambient dFe concentrations in sparse field observations. The Community Earth System Model ocean component was modified to simulate dynamic, group-specific, phytoplankton iron quotas (Fe:C) that vary as a function of ambient iron concentration. The simulated Fe:C ratios match the spatial trends in the observed Fe:C ratios. Acclimation of phytoplankton Fe:C ratios dampens the biogeochemical response to varying atmospheric deposition of soluble iron, compared to a fixed ..., This dataset contains NetCDF output from the CESM v1.98 model, ocean only, Biogeochemical Elemental Cycling. The files presented are a 20 year average for the final 20 years of a 300 year simulation (Years 281-300). Files are provided for every simulation conducted for the results of the paper. This includes the optimal variable stoichiometry model and fixed Fe:C versions with values of 3, 7, 10 for the four iron deposition simulations (onlyBC is Pyro Only, noBC is Dust Only, CESM2opt is Pyro + Dust, BCx2 is 2xPyro + Dust). Supplemental runs include a limited variable run (with parameterization from Moore et al., 2004) and two fixed runs where Fe:C is set at 5 and 6, all three with the CESM2opt (Pyro + Dust) forcing. The fec_full_diaz.csv file contains the observational data of phytoplankton Fe:C including the following fields: num (unique location number), UniqueStn (unique station name), CellType3 (aflag (autotrophic flagellate), diatom, diaz(diazotroph), or NA), CellTypeNum (1 = di..., These .nc files can be opened via Panoply, Python, or any other program that can import NetCDFs. The excel file can be opened using Microsoft Excel, Google Sheets or any other program that can import CSVs. The .m and .mat files can be viewed and executed with MATLAB, or viewed with VSCode or Python using the Scipy or PyTables libraries.溶解态铁（dissolved iron, dFe）在调控海洋生物生产力中发挥着关键作用。在高营养盐低叶绿素区域（占全球海洋面积逾33%），铁是首要的生长限制性营养盐；而在其他海域，铁可调控固氮生物（diazotrophs）的固氮作用与生长速率。铁有效性与碳输出之间的关联，高度依赖于浮游植物的铁配额，即细胞内Fe:C比值。在开阔大洋中，该比值的变化幅度可超过一个数量级，且在现有稀疏野外观测中，其与环境溶解态铁浓度呈显著正相关。 研究团队对社区地球系统模型（Community Earth System Model, CESM）的海洋模块进行了修改，以模拟动态的、类群特异性的浮游植物铁配额（Fe:C），该比值随环境铁浓度动态变化。模拟得到的Fe:C比值与观测到的Fe:C比值空间分布趋势高度吻合。相较于固定Fe:C比值的情景，浮游植物Fe:C比值的驯化响应会削弱生物地球化学过程对大气可溶性铁沉降变化的响应幅度。 本数据集包含CESM v1.98模型仅海洋模块的生物地球化学元素循环（Biogeochemical Elemental Cycling）输出的NetCDF文件。所提供的文件为300年模拟时段最后20年（第281至300年）的20年平均值。本文研究结果对应的所有模拟实验均提供了对应文件，包括最优变量化学计量比模型，以及Fe:C固定为3、7、10的固定比值模型，共覆盖4组铁沉降模拟实验：其中onlyBC仅为Pyro输入，noBC仅为Dust输入，CESM2opt为Pyro + Dust输入，BCx2为2倍Pyro + Dust输入。 补充运行实验包括1组有限变量参数化模拟（采用Moore等人2004年的参数化方案），以及2组Fe:C固定为5和6的固定比值模拟，这3组实验均采用CESM2opt（Pyro + Dust）强迫方案。 fec_full_diaz.csv文件包含浮游植物Fe:C的观测数据集，其字段包括：num（唯一位置编号）、UniqueStn（唯一站位名称）、CellType3（可选值包括aflag即自养鞭毛虫、diatom即硅藻、diaz即固氮生物，或NA）、CellTypeNum（1=硅藻……）。 上述.nc文件可通过Panoply、Python或其他支持NetCDF导入的程序打开。Excel格式文件可使用Microsoft Excel、Google Sheets或其他支持CSV导入的程序打开。.m与.mat文件可通过MATLAB查看并运行，或使用VSCode、Python结合Scipy或PyTables库进行查看。