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UID:20250920T143457EDT-798550rgh7@132.216.98.100
DTSTAMP:20250920T183457Z
DESCRIPTION:Please join us as we welcome Dr. Ali Mashayek from the departme
 nt of Earth\, Atmospheric and Planetary Sciences at MIT for his seminar ti
 tled 'Topographic enhancement of turbulent mixing in the Southern Ocean: r
 egional\, global and climatic implications'. Refreshments will be served.
 \n\nAbstract\n\nDiapycnal turbulent mixing is believed to play a key role 
 in setting the rate of the ocean Meridional Overturning Circulation (MOC)\
 , an important element of the global climate system. Whether mixing is tru
 ly important\, however\, depends on its strength\, which remains poorly qu
 antified on global scale. To address this question\, a passive tracer was 
 released upstream of the Drake Passage in 2009 as a part of a major US-UK 
 field program. While the mixing rates inferred from large scale dispersion
  of the tracer are large\, those inferred based on localized turbulence me
 asurements made along the path of the tracer are so small that defy the ro
 le of mixing as a key driver of the MOC. In this talk I will use an observ
 ationally-tuned high resolution numerical model of the Drake Passage regio
 n to reconcile the two estimates and will show that mixing is indeed suffi
 ciently strong to play an important role in setting the Southern Ocean bra
 nch of the MOC. I will finish by discussing how this recently confirmed en
 hanced mixing connects with other processes that help drive the deep branc
 h of the ocean MOC\, and how together they regulate the climate system thr
 ough exerting constraints on the global carbon and heat budgets.\n\n \n
DTSTART:20160218T203000Z
DTEND:20160218T203000Z
LOCATION:Room 934\, Burnside Hall\, CA\, QC\, Montreal\, H3A 0B9\, 805 rue 
 Sherbrooke Ouest
SUMMARY:Seminar: Dr. Ali Mashayek
URL:/meteo/channels/event/seminar-dr-ali-mashayek-2590
 93
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