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SUMMARY:The imprint of Southern Ocean overturning on seasonal water mass v
 ariability in Drake Passage and the Southern Ocean - Gwyn Evans\, Universi
 ty of Southampton
DTSTART:20140730T100000Z
DTEND:20140730T110000Z
UID:TALK53277@talks.cam.ac.uk
CONTACT:Dr Alexander Brearley
DESCRIPTION:Seasonal changes in water mass properties are discussed in the
 rmohaline coordinates. Examples are presented from Drake Passage using the
  SR1b CTD transects and the CSIRO atlas of regional seas seasonal climatol
 ogy. In addition\, the analysis will be presented for the whole Southern O
 cean using the recent release of the ECCO state estimate. The amount of wa
 ter within temperature and salinity classes and changes therein are used t
 o estimate transports across iso-therms and iso-halines. These transports 
 are considered in combination with surface buoyancy flux climatologies to 
 determine the relative contributions of surface buoyancy fluxes and sub-su
 rface mixing to changes in the distribution of water in thermohaline coord
 inates. The framework developed provides unique insights into the water ma
 sses that are present within Drake Passage\, including the erosion of Anta
 rctic Winter Water (AAWW) during the summer months and the interaction bet
 ween the Circumpolar Deep Waters (CDW) and Antarctic Intermediate Water (A
 AIW). The results presented are consistent with summertime wind-driven inf
 lation of the CDW layer and deflation of the AAIW layer\, with the product
 ion of new AAIW occurring in the winter as a mixture of CDW\, remnant AAWW
  and surface waters.
LOCATION:British Antarctic Survey\, Room 330B
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