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Webinar: Multidecadal Variability and Climate Shift in the North Atlantic Ocean

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Thursday, 28 September 2017, 12:00

Thursday, September 28, 2017. 12:00PM. Webinar: Multidecadal Variability and Climate Shift in the North Atlantic Ocean. James Reagan, Earth System Science Interdisciplinary Center. Sponsored by NOAA. More information here.


The North Atlantic Ocean is home to diverse marine ecosystems, resources, and plays an integral role in the global thermohaline circulation. It has been well documented that ocean heat content (OHC) has been rising globally over the past ~50 years; however, much less is understood with respect to regional OHC changes. For this study we focus on documenting and investigating regional OHC changes in the North Atlantic Ocean by utilizing the World Ocean Atlas 2013 version 2 (WOA13v2) decadal climatologies. The WOA13v2 contains six decadal climatologies of temperature and salinity dating back to 1955. It provides horizontal resolutions of up to ΒΌ-degree and on 102 standard depth levels from 0 to 5500m. We find, by comparing two 30-year climates from 1955-2012, that OHC changes in the North Atlantic are highly inhomogeneous with the largest increases in OHC occurring to the southeast of the Gulf Stream Extension. Additionally, we find that the multidecadal shift in temperature in the Gulf Stream region occurred primarily at the subsurface between 300 and 500m depths. This presentation will discuss the aforementioned results in more detail as well as a possible connection between North Atlantic OHC changes and the Atlantic Multidecadal Oscillation.

 

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