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| Wang, Hongjie; Hu, Xinping; Cai, Wei-jun; Sterba-boatwright, Blair. |
| Determination of the rate of change of sea surface CO2 fugacity (fCO(2)) is important, as the fCO(2) gradient between the atmosphere and the ocean determines the direction of CO2 flux and hence the fate of this greenhouse gas. Using a newly available, community-based global CO2 database (Surface Ocean CO2 Atlas Version 3 coastal data set) and a newly developed statistical method, we report that the global ocean margins (within 400km offshore, 30 degrees S-70 degrees N) fCO(2) temporal trends on decadal time scales (1.931.59atmyr(-1)) closely follow the atmospheric fCO(2) increase rate (1.900.06atmyr(-1)) in the Northern Hemisphere but are lower (1.350.55atmyr(-1)) in the Southern Hemisphere, reflecting dominant atmospheric forcing in conjunction with... |
| Tipo: Text |
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| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00662/77393/78999.pdf |
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| Laruelle, Goulven G.; Cai, Wei-jun; Hu, Xinping; Gruber, Nicolas; Mackenzie, Fred T.; Regnier, Pierre. |
| It has been speculated that the partial pressure of carbon dioxide (pCO(2)) in shelf waters may lag the rise in atmospheric CO2. Here, we show that this is the case across many shelf regions, implying a tendency for enhanced shelf uptake of atmospheric CO2. This result is based on analysis of long-term trends in the air-sea pCO(2) gradient (Delta pCO(2)) using a global surface ocean pCO(2) database spanning a period of up to 35 years. Using wintertime data only, we find that Delta pCO(2) increased in 653 of the 825 0.5 degrees cells for which a trend could be calculated, with 325 of these cells showing a significant increase in excess of + 0.5 mu atm yr(-1) (p < 0.05). Although noisier, the deseasonalized annual data suggest similar results. If this... |
| Tipo: Text |
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| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00673/78498/80777.pdf |
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