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Circulation, biogeochemistry and carbon cycling in ocean margins
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Time of emergence of ocean acidification in ocean margins (Invited)
Monday 7th @ 1410-1430, Concert Hall
Hongjie Wang* , School of Marine Science and Policy, University of Delaware, Newark, Delaware, USA
Wei-Jun Cai, School of Marine Science and Policy, University of Delaware, Newark, Delaware, USA
Presenter Email: hwangde@udel.com |
| Time of Emergence (ToE) is the time when a signal emerges from the noise of natural variability, or signal-to-noise equal to a threshold value of 2. The ToE provides important information for decision making regarding observing system optimization or risk reduction activities. Previous studies have reported that the changes in the rate of anthropogenic carbon uptake can be directly observed in open ocean between 2020 and 2050. However, owing to much larger CO2 variability in ocean margins than in open ocean, the ToE of fCO2 (fugacity of CO2) change is still unclear in ocean margins. This study will determine the ToE of fCO2 change with statistical approaches based on open access dataset Surface Ocean CO2 Atlas Version 5 (SOCAT V5). The preliminary results show that ToE of fCO2 change was 24.1±17.0 years across the global ocean margins, while the ToE of sea surface temperature and sea surface salinity was 92.7±46.4, and 30.7±15.6 years, respectively. Therefore, the rates of ocean acidification significantly outpace the temperature change with regards to moving the system outside of its "natural" envelope. In addition, we also found some areas, for example, the river-dominated ocean margins (i.e., mouth of Chesapeake Bay and northern Gulf of Mexico) had a much longer ToE than other ocean margins, which may result from the extensive anthropogenic nutrients loading. More results and mechanistic interpretation will be presented by including ToE of pH and carbonate saturation state in an effort to better understand ocean acidification rate in ocean margins. |
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