Data-based estimates of the ocean carbon sink variability-results of the Surface Ocean pCO2 Mapping intercomparison (SOCOM)

Title
Data-based estimates of the ocean carbon sink variability-results of the Surface Ocean pCO2 Mapping intercomparison (SOCOM)
Alternative Title
Data-based estimates of the ocean carbon sink variability- results of the Surface Ocean pCO2 Mapping intercomparison (SOCOM)
Author(s)
Christian Rodenback; Dorothee Bakker; Nicolas Bates; Yosuke Iida; Andy Jacobson; Steve Jones; Peter Landschutzer; Nicolas Metzl; Shin-ichiro Nakaoka; Are Olsen; 박근하; Philippe Peylin; Keith Rodgers; Tristan Sasse; Ute Schuster; James Shutler; Vinu Valsala; Rik Wanninkhof; Jiye Zeng
Alternative Author(s)
박근하
Publication Year
2016-04-18
Abstract
Using measurements of the surface-ocean CO2 partial pressure (pCO2) from the SOCAT and LDEO data bases and 14 different pCO2 mapping methods recently collated by the Surface Ocean pCO2 Mapping intercomparison(SOCOM) initiative, variations in regional and global sea– air CO2 fluxes are investigated. Though the available mapping methods use widely different approaches, we find relatively consistent estimates of regional pCO2 seasonality, in line with previous estimates. In terms of interannual variability (IAV), all mapping methods estimate the largest variations to occur in the Eastern equatorial Pacific. Despite considerable spread in the detailed variations, mapping methods that fit the data more closely also tend to agree more closely with each other in regional averages. Encouragingly, this includes mapping methods belonging to complementary types – taking variability either directly from the pCO2 data or indirectly from driver data via regression. From a weighted ensemble average, we find an IAV amplitude of the global sea– air CO2 flux of 0.31 PgC yr-1 (standard deviation over 1992– 2009), which is larger than simulated by biogeochemical process models. On a decadal perspective, the global ocean CO2 uptake is estimated to have gradually increased since about 2000, with little decadal change prior to that. The weighted mean net global ocean CO2 sink estimated by the SOCOM ensemble is -1.75 in regional and global sea– air CO2 fluxes are investigated. Though the available mapping methods use widely different approaches, we find relatively consistent estimates of regional pCO2 seasonality, in line with previous estimates. In terms of interannual variability (IAV), all mapping methods estimate the largest variations to occur in the Eastern equatorial Pacific. Despite considerable spread in the detailed variations, mapping methods that fit the data more closely also tend to agree more closely with each other in regional averages. Encouragingly, this includes mapping methods belonging to complementary types – taking variability either directly from the pCO2 data or indirectly from driver data via regression. From a weighted ensemble average, we find an IAV amplitude of the global sea– air CO2 flux of 0.31 PgC yr-1 (standard deviation over 1992– 2009), which is larger than simulated by biogeochemical process models. On a decadal perspective, the global ocean CO2 uptake is estimated to have gradually increased since about 2000, with little decadal change prior to that. The weighted mean net global ocean CO2 sink estimated by the SOCOM ensemble is -1.75
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/24907
Bibliographic Citation
European Geosciences Union General Assembly 2016, 2016
Publisher
European Geosciences Union
Type
Conference
Language
English
Publisher
European Geosciences Union
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