1/8˚ resolution MOM6-COBALT physical and biogeochemical diagnostics for the Gulf of Mexico, monthly means between 2008-2018

The files in this dataset contain monthly mean chlorophyll (µg/kg), pH, nitrate (mol/kg), dissolved oxygen (mol/kg), potential temperature (˚C) and salinity model outputs for 2008-2018 for the region between 18-31˚N, 98-80˚W. Data was extracted from a global grid run with coupled ocean-ice model configured using the Modular Ocean Model 6 (MOM6, https://github.com/NOAA-GFDL/MOM6 ) and Sea Ice Simulator (SIS2) developed at the NOAA Geophysical Fluid Dynamics Laboratory (Adcroft et al., 2019). The horizontal resolution of the grid is 1/8˚, which is considered eddying and no eddy parameterization was included. Vertically, the model uses 75 hybrid vertical-sigma2 layer coordinates that is remapped onto 35 World Ocean Atlas/Coupled Model Intercomparison Project standard depth levels. The atmospheric forcing was derived from the Japanese 55-year Reanalysis version 1.5 (JRA55 1.5, https://jra.kishou.go.jp/JRA-55/index_en.html#jra-55). The model is driven by river freshwater runoff from a monthly climatology derived from Dai and Trenberth (2002) and Dai et al. (2009), which can be assessed at https://rda.ucar.edu/datasets/ds551.0/. A remapping scheme was used to add freshwater into the appropriate coastal grid cells near the river mouths. The biogeochemical model used was the Carbon, Ocean Biogeochemistry and Lower Trophics (COBALTv2, Stock et al., 2020), which uses 33 tracers for representation of coupled elemental cycles of carbon, nitrogen, phosphorus, iron, silicon, alkalinity, oxygen and lithogenic matter and associated plankton food web dynamics. More details about the model setup are described in Liu et al. (2019) and Liu et al. (2021). References: Adcroft, A., Anderson, W., Blanton, C., Bushuk, M., Dufour, C.O., Dunne, J.P., Griffies, S.M. et al. (2019). The GFDL Global Ocean and Sea Ice Model OM4.0: Model description and simulation features. Journal of Advances in Modeling Earth System, doi: 10.1029/2019MS001726 Dai, A., T. Qian, K. E. Trenberth, and J. D Milliman, 2009: Changes in continental freshwater discharge from 1948-2004. J. Climate, 22, 2773-2791 Dai, A., and K. E. Trenberth, 2002: Estimates of freshwater discharge from continents: Latitudinal and seasonal variations. J. Hydrometeorol., 3, 660-687 Liu, X., Dunne, J.P., Stock, C. A., Harrison, M.J., Adcroft, A., Resplandy, L. (2019). Simulating Water Residence Time in the Coastal Ocean: A Global Perspective. Geophysical Research Letters, 46, 22, 13910-13919. Doi:10.1029/2019GL085097 Liu, X., Stock, C.A., Dunne, J.P., Lee, M., Shevliakova, E., Malyshev, S., Milly, P.C.D (2021). Simulated Global Coastal Ecosystem Responses to a Half-Century Increase in River Nitrogen Loads. Stock, C. A., Dunne, J. P., Fan, S., Ginoux, P., John, J., Krasting, J. P., et al. (2020). Ocean biogeochemistry in GFDL's Earth System Model 4.1 and its response to increasing atmospheric CO2. Journal of Advances in Modeling Earth Systems, 12, e2019MS002043. https://doi.org/10.1029/2019MS002043本数据集包含2008-2018年间北纬18°至31°、西经80°至98°海域的逐月平均叶绿素（chlorophyll，µg/kg）、pH值、硝酸盐（nitrate，mol/kg）、溶解氧（dissolved oxygen，mol/kg）、位温（potential temperature，℃）及盐度（salinity）的模式输出结果。 数据提取自耦合海冰模式（coupled ocean-ice model）的全球网格模拟结果，该耦合模式采用美国国家海洋和大气管理局（NOAA）地球物理流体动力学实验室（Geophysical Fluid Dynamics Laboratory, GFDL）开发的模块化海洋模式6（Modular Ocean Model 6, MOM6，https://github.com/NOAA-GFDL/MOM6）与海冰模拟器2（Sea Ice Simulator, SIS2）构建（Adcroft等，2019）。 该网格的水平分辨率为1/8°，可解析中尺度涡旋，未采用涡旋参数化（eddy parameterization）方案。垂直方向上，模式采用75层混合σ2垂直坐标（hybrid vertical-sigma2 layer coordinates），并将其重映射至35层世界海洋图集（World Ocean Atlas）/耦合模式比对项目（Coupled Model Intercomparison Project）标准深度层。 大气强迫场（atmospheric forcing）源自日本55年再分析资料第1.5版（Japanese 55-year Reanalysis version 1.5, JRA55 1.5，https://jra.kishou.go.jp/JRA-55/index_en.html#jra-55）。 模式的驱动项包含基于Dai与Trenberth（2002）及Dai等（2009）构建的逐月气候态的河流淡水径流（river freshwater runoff），该数据集可通过https://rda.ucar.edu/datasets/ds551.0/获取。研究采用重映射方案将淡水注入河口附近的对应沿海网格单元。 本数据集采用的生物地球化学模式（biogeochemical model）为碳、海洋生物地球化学与低营养级生物模式（Carbon, Ocean Biogeochemistry and Lower Trophics, COBALTv2，Stock等，2020），该模式通过33种示踪剂（tracers）表征碳、氮、磷、铁、硅、碱度、氧及陆源碎屑的耦合元素循环，并模拟相关浮游生物食物网动力学过程。 关于模式设置的更多细节可参见Liu等（2019）与Liu等（2021）的研究。 参考文献： Adcroft, A., Anderson, W., Blanton, C., Bushuk, M., Dufour, C.O., Dunne, J.P., Griffies, S.M. et al. (2019). The GFDL Global Ocean and Sea Ice Model OM4.0: Model description and simulation features. Journal of Advances in Modeling Earth System, doi: 10.1029/2019MS001726 Dai, A., T. Qian, K. E. Trenberth, and J. D Milliman, 2009: Changes in continental freshwater discharge from 1948-2004. J. Climate, 22, 2773-2791 Dai, A., and K. E. Trenberth, 2002: Estimates of freshwater discharge from continents: Latitudinal and seasonal variations. J. Hydrometeorol., 3, 660-687 Liu, X., Dunne, J.P., Stock, C. A., Harrison, M.J., Adcroft, A., Resplandy, L. (2019). Simulating Water Residence Time in the Coastal Ocean: A Global Perspective. Geophysical Research Letters, 46, 22, 13910-13919. Doi:10.1029/2019GL085097 Liu, X., Stock, C.A., Dunne, J.P., Lee, M., Shevliakova, E., Malyshev, S., Milly, P.C.D (2021). Simulated Global Coastal Ecosystem Responses to a Half-Century Increase in River Nitrogen Loads. Stock, C. A., Dunne, J. P., Fan, S., Ginoux, P., John, J., Krasting, J. P., et al. (2020). Ocean biogeochemistry in GFDL's Earth System Model 4.1 and its response to increasing atmospheric CO2. Journal of Advances in Modeling Earth Systems, 12, e2019MS002043. https://doi.org/10.1029/2019MS002043