1. Eddy-fying Research: Understanding Properties of Southern Ocean Eddies Intern: Bridget Zakrzewski Mentor: Ivy Frenger
How can we combine surface and sub-surface data to observe mesoscale eddies?

2. What Is An Eddy? Whirlpools Part of ocean turbulence Importance:
- Mixing and water-mass transport Tracer distribution & ocean dynamics
(Southern Hemisphere)
Drake Passage Eddy, NASA

3. 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!)

4. ACC Eddies Antarctic Circumpolar Current (ACC) surrounds Antarctica
ACC is largest current in the world
Southern Ocean dynamics
South ACC
North ACC
North ACC
North ACC
Eddy anomalies shown above. Note: North of ACC = outside of ACC, South of ACC = inside of ACC

5. Eddies near South Western Australia (or “Weird” Eddies)
Cyclones with positive anomaly
Maximum life span of 72+ weeks
(Courtesy of Ivy Frenger)

6. “Weird” Eddy Anomalies (3+ months) (Sorted by eddy lifespan)
Bin1: <22wks Bin5: 52-61wks
Bin2: 22-31wks Bin6: 62-71wks
Bin3: 32-41wks Bin7: 72-81wks
Bin4: 42-51wks Bin8: >82wks

7. Possible Origins of “Weird” Eddies
Warm surface boundary currents
Eddy-rich currents

8. 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

9. Acknowledgements
For the continuous support throughout my summer experience, I would like to thank: Ivy Frenger, Mentor Professor Jorge Sarmiento, Host AOS/GFDL community, Support Princeton Environment Institute (PEI)