BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Polar Oceans Seminar Talk - Yavor Kostov - Yavor Kostov
DTSTART:20260401T130000Z
DTEND:20260401T140000Z
UID:TALK242131@talks.cam.ac.uk
CONTACT:Katherine Turner
DESCRIPTION:Water mass transformation in the supbolar North Atlantic is s
 ensitive to the combined effects of wind stress and surface buoyancy anoma
 lies\, which trigger a signal that gets communicated southward and impacts
  the subtropical AMOC. We explore historical variability in the volume of
  accumulated Labrador Sea Water (LSW) using ECCO\, an ocean state estimate
  configuration of the Massachusetts Institute of Technology general circul
 ation model (MITgcm). The model's adjoint\, a linearization of the MITgcm\
 , is set up to output the lagged sensitivity of the water mass volume to s
 urface boundary conditions. This allows us to reconstruct the evolution of
  LSW volume over recent decades using historical surface wind stress\, hea
 t\, and freshwater fluxes. Each of these boundary conditions contributes s
 ignificantly to the LSW variability that we recover\, but these impacts ar
 e associated with different geographical fingerprints and arise over a ran
 ge of time lags. We show that the volume of LSW accumulated in the Labrado
 r Sea exhibits a delayed response to surface wind stress and buoyancy forc
 ing outside the convective interior of the Labrador Sea at important locat
 ions in the North Atlantic Ocean. In particular\, patterns of wind and sur
 face density anomalies can act as a “traffic controller” and regulate 
 the North Atlantic Current's (NAC's) transport of warm and saline subtropi
 cal water masses that are precursors for the formation of LSW. This propen
 sity for a delayed response of LSW to remote forcing allows us to predict 
 a limited yet substantial and significant fraction of LSW variability at l
 east 1 year into the future. Our analysis also enables us to attribute LSW
  variability to different boundary conditions and to gain insight into the
  major mechanisms that contribute to volume anomalies in this deep water m
 ass. We point out the important role of key processes that promote the for
 mation of LSW in both the Irminger and Labrador seas: buoyancy loss and pr
 econditioning along the NAC pathway and in the Iceland Basin\, the Irminge
 r Sea\, and the Nordic Seas.
LOCATION:BAS Seminar Room 1
END:VEVENT
END:VCALENDAR