eddy-fying research: understanding properties of southern ocean eddies intern: bridget zakrzewski...
TRANSCRIPT
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Eddy-fying Research: Understanding Properties of Southern Ocean EddiesIntern: Bridget Zakrzewski Mentor: Ivy Frenger
How can we combine surface and sub-surface data to observe mesoscale eddies?
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What Is An Eddy?• Whirlpools• Part of ocean turbulence• Importance: - Mixing and water-mass transport - Tracer distribution & ocean dynamics
Drake Passage Eddy, NASA(Southern Hemisphere)
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How Can We Observe Eddies?• Altimetry (AVISO – 1992)(spatio-temporal coverage, no sub-surface data)
• In-Situ Data (Argo – early 2000s)(Vertical structure, less spatio-temporal coverage)
• Both(get the benefits of each!)
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ACC Eddies• Antarctic Circumpolar Current (ACC) surrounds
Antarctica• ACC is largest current in the world• Southern Ocean dynamics
Eddy anomalies shown above. Note: North of ACC = outside of ACC, South of ACC = inside of ACC
South ACC
North ACC North ACC North ACC
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Eddies near South Western Australia(or “Weird” Eddies)
• Cyclones with positive anomaly• Maximum life span of 72+ weeks
(Courtesy of Ivy Frenger)
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“Weird” Eddy Anomalies (3+ months)(Sorted by eddy lifespan)
Bin1: <22wks Bin5: 52-61wksBin2: 22-31wks Bin6: 62-71wksBin3: 32-41wks Bin7: 72-81wksBin4: 42-51wks Bin8: >82wks
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Possible Origins of “Weird” Eddies• Warm surface boundary currents• Eddy-rich currents
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Potential Future Research • Take a closer look at salinity anomaly
crossing• Observe eddies near other boundary
currents• Use absolute values, not anomalies• Understand differences in slopes for
anticyclones vs. cyclones
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AcknowledgementsFor the continuous support throughout my summer
experience, I would like to thank:Ivy Frenger, Mentor
Professor Jorge Sarmiento, HostAOS/GFDL community, Support
Princeton Environment Institute (PEI)