Spatial and temporal variations in sea surface pCO2 and air-sea flux of CO2 in the Bering Sea revealed by satellite-based data during 2003–2019

• DOI: 10.3389/fmars.2023.1099916
• Publication Date: 2023-06-14T05:18:20Z
• Authors: Siqi Zhang; Yan Bai; Xianqiang He; Zhiting Jiang; Teng Li; Fang Gong; Shujie Yu; Delu Pan
• Keywords: Mixed layer

The understanding of long-time-series variations in air-sea CO 2 flux the Bering Sea is critical, as it passage area from North Pacific Ocean water to Arctic. Here, a data-driven remote sensing retrieval method constructed based on large amount underway partial pressure ( p ) data Sea. After several experiments, Gaussian process regression model with input parameters sea surface temperature, height, mixed-layer depth, chlorophyll concentration, dry air mole fractions , and bathymetry was selected. validation independent data, root mean square error was< 24 μatm (R = 0.94) satisfactory performance. Then, we reconstructed 2003 2019 estimated corresponding fluxes. Significant seasonal were identified, higher winter/spring than summer/autumn both basin shelf area. Semiquantitative analysis reveals that non-temperature-dominated temperature effect 12.7 non-temperature −51.8 μatm. From 2019, atmospheric increased at rate 2.1 yr −1 while rapidly (2.8 ); thus, emissions increased. However, carbon sink continental still continuously whole exhibited an increasing integral fluxes 6 19 TgC over 17 years. Meanwhile, amplitudes also increased, approaching 14 per decade. reaction added seawater reduced ocean system capacity. This first study present satellite high resolution Sea, which beneficial for studying changes ecosystems