BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Links between ice loss\, stratification and ocean heat content in 
 the Rothera time series (RaTS) - Hugh Venables (British Antarctic Survey)
DTSTART:20120704T100000Z
DTEND:20120704T110000Z
UID:TALK38428@talks.cam.ac.uk
CONTACT:Povl Abrahamsen
DESCRIPTION:The Rothera times series (RaTS) has been collecting water colu
 mn profiles from Ryder Bay through the year since 1998. During this time t
 here has been considerable variation in winter ice cover\, providing an op
 portunity to study the potential sub-surface effects of the broad scale re
 duction in ice cover along the Antarctic Peninsula. In heavy ice years the
 re is little mixing in winter\, extending to approximately 75m. In low ice
  years winter mixing can reach 150m\, releasing significant amounts of hea
 t to the atmosphere. This mixing homogenises salinity and so leads to redu
 ced water column stratification the following summer. This reduced stratif
 ication leads to an increase in the vertical extent of mixing and so allow
 s heat to be mixed from the surface to greater depths (for the same mechan
 ical and heat energy input). By early autumn temperatures recover to initi
 al values at around 100m\; deeper than 100m temperatures don't fully recov
 er but shallower than 100m they increase to warmer than they started. This
  process increases the heat content of the water column in autumn and ther
 efore likely affects the formation of ice the following winter.
LOCATION:British Antarctic Survey\, Room 307
END:VEVENT
END:VCALENDAR