Particulate organic carbon flux: refers to the total amount of POC passing through a certain section within a certain period of time, the unit is kilotons (kt). The dataset has a high spatial resolution of 500 meters × 500 meters and covers the Yangtze River Estuary and its adjacent sea areas from July 2011 to June 2018. Compared with the measured POC flux data (the product of the measured POC concentration and the measured flow rate) of Xuliujing Hydrological Station, the root mean square error of this data set is 0.16 g/(s·m2), and the average relative error is 28.13%.
This dataset is a POC flux estimation model constructed based on a combination of GOCI remote sensing data and the FVCOM three-dimensional hydrodynamic-sediment model. The monthly POC flux at each grid point is calculated. Among them, the FVCOM three-dimensional hydrodynamic-sediment model uses the predicted water levels obtained from the eight major tidal divisions of the China Sea 1/30° tidal model in the OTIS (OSU Tidal Data Inversion) model on the open boundary as tidal forcing. The daily measured flow data from the Datong Hydrological Station and the monthly average sediment concentration provided by the "China River Sediment Bulletin" are used as input, and wind field at the upper boundary of the air and sea from the European Center for Medium-Range Weather Forecasts (ECMWF) is used as input. Assuming that the sediment concentration profile distribution of the Yangtze River Estuary is similar to the POC profile distribution, the sediment concentration profile distribution simulated by FVCOM is combined with the sea surface POC concentration inverted by GOCI to obtain the three-dimensional distribution of POC concentration in the Yangtze River Estuary, which is consistent with the three-dimensional distribution of POC concentration simulated by FVCOM. The flow fields are combined to calculate the POC flux. This method makes full use of the observational advantages of the two methods and also reduces the uncertainty of the separate estimation results of the two methods, providing a new idea for estimating the flux of POC and other materials into the sea in complex estuaries.
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