uu.seUppsala University Publications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Ocean-driven thinning enhances iceberg calving and retreat of Antarctic ice shelves
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL. (Naturgeografi)
Show others and affiliations
2015 (English)In: Proceedings of the National Academy of Sciences of the United States of America, ISSN 0027-8424, E-ISSN 1091-6490, Vol. 112, no 11, 3263-3268 p.Article in journal (Refereed) Published
Abstract [en]

Iceberg calving from all Antarctic ice shelves has never been directly measured, despite playing a crucial role in ice sheet mass balance. Rapid changes to iceberg calving naturally arise from the sporadic detachment of large tabular bergs but can also be triggered by climate forcing. Here we provide a direct empirical estimate of mass loss due to iceberg calving and melting from Antarctic ice shelves. We find that between 2005 and 2011, the total mass loss due to iceberg calving of 755 +/- 24 gigatonnes per year (Gt/y) is only half the total loss due to basal melt of 1516 +/- 106 Gt/y. However, we observe widespread retreat of ice shelves that are currently thinning. Net mass loss due to iceberg calving for these ice shelves (302 +/- 27 Gt/y) is comparable in magnitude to net mass loss due to basal melt (312 +/- 14 Gt/y). Moreover, we find that iceberg calving from these decaying ice shelves is dominated by frequent calving events, which are distinct from the less frequent detachment of isolated tabular icebergs associated with ice shelves in neutral or positive mass balance regimes. Our results suggest that thinning associated with ocean-driven increased basal melt can trigger increased iceberg calving, implying that iceberg calving may play an overlooked role in the demise of shrinking ice shelves, and is more sensitive to ocean forcing than expected from steady state calving estimates.

Place, publisher, year, edition, pages
2015. Vol. 112, no 11, 3263-3268 p.
Keyword [en]
iceberg calving, basal melt, mass balance, ice shelf, Antarctica
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:uu:diva-251418DOI: 10.1073/pnas.1415137112ISI: 000351060000049PubMedID: 25733856OAI: oai:DiVA.org:uu-251418DiVA: diva2:807428
Available from: 2015-04-23 Created: 2015-04-17 Last updated: 2017-12-04Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textPubMed

Authority records BETA

Moore, John C.

Search in DiVA

By author/editor
Moore, John C.
By organisation
LUVAL
In the same journal
Proceedings of the National Academy of Sciences of the United States of America
Earth and Related Environmental Sciences

Search outside of DiVA

GoogleGoogle Scholar

doi
pubmed
urn-nbn

Altmetric score

doi
pubmed
urn-nbn
Total: 728 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf