Spatio-temporal variability of the carbonate system and air-sea CO2 fluxes in the South Yellow Sea and East China Sea during the warm seasons
This data was collected in the South Yellow Sea and East China Sea during spring, 2017 and summer, 2018. The carbonate system data demonstrated that the South Yellow-East China Sea region shifted from a strong CO2 sink in spring to a weak CO2 source in summer, and revealed the mechanisms of the carbonate system variability and the driver mechanisms of the pCO2 variations in different subregions and seasons. The underway pCO2 data showed a high-resolution of pCO2 variability in the entire South Yellow Sea and East China Sea. This data is a valid tool to allow us better understanding of the process determing the spatial and temporal vairiations of the carbonate system in continetal seas, which is an important step toward estimating global air-sea CO2 fluxes.
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pH was measured onboard at 25 °C by Fisher pH meter (Star A211) combining with Ross Orion combination electrode (Ross-8102) on NBS scale with a precision of ±0.01. DIC and TA samples were collected in 250 mL borosilicate glass bottles and poisoned with 100 μL saturated HgCl2, then analyzed at home Lab within 1 month. DIC samples were analyzed with AS-C3 DIC analyzer (Apollo SciTech Inc.); TA samples were determined by Gran titration using the open-cell method with a semi-automatic potentiometric titration system (ApolloSciTech Inc.). underway pCO2 was monitored through an underway pCO2 analyzer (AS-P2, ApolloSciTech Inc.) with a Picarro detector (G2301)