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CATEGORIES:Department of Earth Sciences Seminars (downtown)
SUMMARY:Environmental controls on mineral-associated perma
 frost organic carbon fate - Catherine Hirst\, Univ
 ersity of Durham
DTSTART;TZID=Europe/London:20250211T120000
DTEND;TZID=Europe/London:20250211T130000
UID:TALK224722AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/224722
DESCRIPTION:The Arctic is warming nearly four times faster tha
 n the rest of Earth’s surface (Rantanen et al.\, 2
 022). Consequently\, permafrost areal extent is pr
 ojected to decrease (24 ± 16% by 2100\, RCP2.6\, C
 hadburn et al.\, 2017) and Arctic precipitation is
  projected to increase (50 – 60 % by 2100\, RCP2.6
 \, Bitanja and Andry\, 2017). Permafrost contains 
 ~ two times as much carbon as Earth’s atmosphere (
 Hugelius et al.\, 2014). Upon thaw\, permafrost or
 ganic carbon is a) stored in soils and sediments\,
  b) transferred from soils to aquatic bodies\, c) 
 broken down to inorganic carbon in soils and aquat
 ic bodies. A fraction of this inorganic carbon is 
 released as greenhouse gases to the atmosphere whi
 ch could amplify Arctic warming (the permafrost ca
 rbon feedback\, Schuur et al.\, 2015). \nA portion
  of permafrost organic carbon is associated with m
 inerals (e.g.\, Garcia-Palacios et al.\, 2023) whi
 ch contribute to modulating if carbon is stored in
  the land or released into the atmosphere (e.g.\, 
 Patzner et al.\, 2020). Our work seeks to understa
 nd the environmental controls on how\, where and w
 hen minerals contribute to carbon release from the
 se vulnerable landscapes. To do this we couple in-
 field measurements (e.g.\, precipitation and water
  table depth) with geochemical measurements (e.g.\
 , isotopes\, microscopy\, spectroscopy. I will pre
 sent findings from large and small Arctic catchmen
 ts and ongoing ideas for future research. \n
LOCATION:Department of Earth Sciences\, Tilley Lecture Thea
 tre
CONTACT:Dr Rachael Rhodes
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