Summary
This paper presents an improved multiyear estimate of Arctic Ocean CO₂ uptake by incorporating satellite-derived chlorophyll a concentrations into a self-organising map technique for mapping surface water pCO₂. The inclusion of chlorophyll a as a parameter better captured biologically mediated pCO₂ reduction in spring and reduced overall uncertainty in CO₂ flux estimates. The study quantified net annual Arctic Ocean CO₂ uptake at 180 ± 130 Tg C yr⁻¹ with assessment of seasonal to interannual variation.
UK applicability
The findings are not directly applicable to UK agricultural or farming systems, as the research focuses on marine carbon cycling in the Arctic Ocean. However, the methodological advances in incorporating biological productivity data into carbon flux models may have indirect relevance to UK-based marine science and climate monitoring initiatives.
Key measures
Partial pressure of CO₂ in surface water (pCO₂w); air–sea CO₂ flux (Tg C yr⁻¹); chlorophyll a concentration; seasonal and interannual variation in CO₂ influx
Outcomes reported
The study estimated monthly air–sea CO₂ fluxes in the Arctic Ocean north of 60°N from 1997 to 2014, incorporating chlorophyll a concentrations from satellite remote sensing. The analysis yielded a net annual Arctic Ocean CO₂ uptake of 180 ± 130 Tg C yr⁻¹ with reduced uncertainty compared to previous estimates.
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