Monthly mean sea-air flux of CO2 from the FVCOM-NPZC model from 2003 to 2019

The data set is the monthly average sea-air flux of CO2 (FCO2) data from 2003 to 2019 output by the FVCOM-NPZC model. The FVCOM-NPZC model was initialized with the realistic forcing in 2003 for a three-year spin-up. A continuous run was then started from January 1, 2003 to December 31, 2019. For the FVCOM dynamical model, the river discharge information for the Changjiang River was taken from publicly available observational data from the Datong hydrometric station (http://yu-zhu.vicp.net/). The daily-mean heat fluxes were obtained from objectively analysed air–sea fluxes, and the 3-h wind stress data were obtained from the ERA-Interim reanalysis. The open boundary conditions, including the daily temperature, salinity and velocities at the Taiwan Strait, the western Pacific Ocean and the Japan/East Sea, were obtained from the hybrid coordinate ocean model. In the ecological model, inputs of nutrients, DIC, DOC, and POC from rivers are derived from historical river bulletins. For the Kuroshio open boundary, quarterly observational data from the PN transect are used. The DIC open boundary for the Taiwan Strait is calculated based on monthly pCO2 data from RS and climatological TA data. Other open boundaries utilize interpolated data obtained from multi-year survey data.

本数据集为FVCOM-NPZC模型输出的2003至2019年逐月平均海-气CO₂通量（FCO2）数据。该模型以2003年的实际强迫场为初始条件完成三年自旋调整后，于2003年1月1日启动连续模拟，直至2019年12月31日。针对FVCOM动力模型，长江径流量信息取自大通水文站的公开观测数据（数据源链接：http://yu-zhu.vicp.net/）；日平均热通量源自客观分析海-气通量数据集，3小时分辨率的风应力数据则取自ERA-Interim再分析数据集。台湾海峡、西太平洋及日本海/东海水域的逐日温度、盐度和流速场开边界条件，均来自混合坐标海洋模型。生态模型方面，河流输入的营养盐、溶解无机碳（Dissolved Inorganic Carbon, DIC）、溶解有机碳（Dissolved Organic Carbon, DOC）及颗粒有机碳（Particulate Organic Carbon, POC）数据均来源于历史河流通报；黑潮开边界采用PN断面的季度观测数据，台湾海峡的溶解无机碳（DIC）开边界则基于RS获取的逐月pCO₂数据及气候态总碱度（Total Alkalinity, TA）数据计算得到，其余开边界均采用基于多年调查数据插值得到的数据集。