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CATEGORIES:British Antarctic Survey - Polar Oceans seminar se
 ries
SUMMARY:Mirabilite and salinity dynamics in sea ice brines
  - Ben Butler\, James Hutton Institute
DTSTART;TZID=Europe/London:20161102T100000
DTEND;TZID=Europe/London:20161102T110000
UID:TALK66896AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/66896
DESCRIPTION:Seawater is a relatively complex mixture of dissol
 ved salts that is dominated by six major ions: Na+
 \, K+\, Mg2+\, Ca2+\, Cl- and SO42-. When seawater
  freezes in high latitude environments on Earth\, 
 the presence of these dissolved salts markedly aff
 ects the microstructure of the ice that forms\, re
 sulting in sea ice that is permeated by countless 
 inclusions of concentrated seawater brine. The bri
 ne inclusions represent the site of all chemical a
 nd biological reactions in sea ice\, and become in
 creasingly saline with decreasing temperature. The
  paired effect of changing temperature and salinit
 y results in dramatic changes to mineral solubilit
 y within the brine\, which results in the precipit
 ation of a whole suite of minerals within the sea 
 ice microstructure. Each mineral displays a distin
 ct behaviour and role within the sea ice system.\n
 \nThis talk tells the story of one of these sea ic
 e minerals\, mirabilite (Na2SO4·10H2O). Mirabilite
  has never been identified in sea ice in the field
 \, but through a range of laboratory investigation
 s it will firstly be shown that it is likely to be
  omnipresent in the sea ice environment below –6.4
  °C. Secondly\, the effects of mirabilite precipit
 ation on the geochemical properties of the sea ice
  brine system will be evaluated. Lastly\, the sign
 ificance of these changes in relation to the measu
 rement of salinity in the sea ice brine environmen
 t\, which is a crucial physico-chemical property o
 f the sea ice biome\, will be outlined. \n
LOCATION:British Antarctic Survey\, Room 187
CONTACT:Dr Dave Munday
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