AI Article Synopsis
- Ventilation and mixing of ocean gyres are crucial for heat and gas transfer between the ocean and atmosphere, as well as for nutrient supply in mid-latitudes.
- A study using (14)C/(12)C ratios from a Bermuda coral indicates consistent mixing rates in the Sargasso Sea over the past two centuries, despite significant climate shifts.
- The findings suggest that the formation rates of sub-tropical mode water are stable and that the absorption of anthropogenic carbon by the ocean does not lead to fluctuating release back to the surface.
Article Abstract
Ventilation and mixing of oceanic gyres is important to ocean-atmosphere heat and gas transfer, and to mid-latitude nutrient supply. The rates of mode water formation are believed to impact climate and carbon exchange between the surface and mid-depth water over decadal periods. Here, a record of (14)C/(12)C (1780-1940), which is a proxy for vertical ocean mixing, from an annually banded coral from Bermuda, shows limited inter-annual variability and a substantial Suess Effect (the decrease in (14)C/(12)C since 1900). The Sargasso Sea mixing rates between the surface and thermocline varied minimally over the past two centuries, despite changes to mean-hemispheric climate, including the Little Ice Age and variability in the North Atlantic Oscillation. This result indicates that regional formation rates of sub-tropical mode water are stable over decades, and that anthropogenic carbon absorbed by the ocean does not return to the surface at a variable rate.
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| http://dx.doi.org/10.1038/ncomms1811 | DOI Listing |
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