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A machine-learning reconstruction of sea surface pCO2 in the North American Atlantic Coastal Ocean Margin from 1993 to 2021.
- Source :
- Earth System Science Data Discussions; 8/19/2024, p1-32, 32p
- Publication Year :
- 2024
-
Abstract
- Insufficient spatiotemporal coverage of partial pressure of CO<subscript>2</subscript> (p CO<subscript>2</subscript>) observations has hindered precise studies of the coastal carbon cycle along the North American Atlantic Coastal Ocean Margin (NAACOM). Earlier p CO<subscript>2</subscript>-products have encountered difficulties in accurately capturing the heterogeneity of regional variations and decadal trends of p CO<subscript>2</subscript> in the NAACOM. This study developed a regional reconstructed p CO<subscript>2</subscript>-product for the NAACOM (Reconstructed Coastal Acidification Database- p CO<subscript>2</subscript>, or ReCAD-NAACOM- p CO<subscript>2</subscript>) using a two-step approach combining random forest regression and linear regression. The product provides monthly p CO<subscript>2</subscript> data at 0.25° spatial resolution from 1993 to 2021, enabling investigation of regional spatial differences, seasonal cycles, and decadal changes in p CO<subscript>2</subscript>. The observation-based reconstruction was trained using Surface Ocean CO<subscript>2</subscript> Atlas (SOCAT) observations as ground-truth values, with various satellite-derived and reanalysis environmental variables known to control sea surface p CO<subscript>2</subscript> as model inputs. The product shows high accuracy during the model training, validation, and independent test phases, demonstrating robustness and capability to accurately reconstruct p CO<subscript>2</subscript> in regions or periods lacking direct observational data in the NAACOM. Compared with all the observation samples from SOCAT, the p CO<subscript>2</subscript>-product yields a determination coefficient of 0.83, a root-mean-square error of 18.64 µatm, and an accumulative uncertainty of 23.83 µatm. The ReCAD-NAACOM- p CO<subscript>2</subscript> product demonstrates its capability to resolve seasonal cycles, regional-scale variations, and decadal linear trends of p CO<subscript>2</subscript> along the NAACOM. This new product provides reliable p CO<subscript>2</subscript> data for more precise studies of coastal carbon dynamics in the NAACOM region. The dataset is publicly accessible at https://doi.org/10.5281/zenodo.11500974 (Wu et al., 2024a) and will be updated regularly. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 18663591
- Database :
- Complementary Index
- Journal :
- Earth System Science Data Discussions
- Publication Type :
- Academic Journal
- Accession number :
- 179243977
- Full Text :
- https://doi.org/10.5194/essd-2024-309