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Dangosydd eitem ddigidol (DOI)

  • David Barnes
    British Antarctic Survey, Natural Environment Research Council (NERC)
  • Chester Sands
    British Antarctic Survey, Natural Environment Research Council (NERC)
  • Alison Cook
    Department of Geography, Durham University, Lower Mountjoy, South Road, Durham, DH1 3LE, UK
  • Floyd Howard
  • Alejandro Román González
    University of Exeter, Centre for Geography and Environmental Sciences
  • Carlos Muñoz-Ramirez
    U. Catolica de la Ssma Concepcion, Chile
  • Kate Retallick
  • James Scourse
    College of Life and Environmental Sciences, University of Exeter, Penryn Campus, Penryn, 9 TR10 9EZ, UK.
  • Katrien Van Landeghem
  • Nadescha Zwerschke
    British Antarctic Survey, Natural Environment Research Council (NERC)
Rising atmospheric CO2 is intensifying climate change but it is also driving global and particularly polar greening. However, most blue carbon sinks (that held by marine organisms) are shrinking, which is important as these are hotspots of genuine carbon sequestration. Polar blue carbon increases with losses of marine ice over high latitude continental shelf areas. Marine ice (sea ice, ice shelf and glacier retreat) losses generate a valuable negative feedback on climate change. Blue carbon change with sea ice and ice shelf losses has been estimated, but not how blue carbon responds to glacier retreat along fjords. We derive a testable estimate of glacier retreat driven blue carbon gains by investigating three fjords in the West Antarctic Peninsula (WAP). We started by multiplying ~40 year-mean glacier retreat rates by the number of retreating WAP fjords and their time of exposure. We multiplied this area by regional zoobenthic carbon means from existing datasets to suggest that WAP fjords generate 3130 tonnes of new zoobenthic carbon per year (t zC yr–1) and sequester >780 t zC yr-1. We tested this by capture and analysis of 204 high resolution seabed images along emerging WAP fjords. Biota within these images were identified to density per 13 functional groups. Mean stored carbon per individual was assigned from literature values to give a stored zoobenthic Carbon per area, which was multiplied up by area of fjord exposed over time, which increased the estimate to 4536 t zC yr-1. The purpose of the current study was to establish a testable estimate of blue carbon change caused by glacier retreat along Antarctic fjords and thus to establish its relative importance compared to polar and other carbon sinks.

Allweddeiriau

Iaith wreiddiolSaesneg
CyfnodolynGlobal Change Biology
Dyddiad ar-lein cynnar23 Maw 2020
Dynodwyr Gwrthrych Digidol (DOIs)
StatwsE-gyhoeddi cyn argraffu - 23 Maw 2020
Gweld graff cysylltiadau