dc.contributor.author
Bernales, Jorge
dc.contributor.author
Rogozhina, Irina
dc.contributor.author
Thomas, Maik
dc.date.accessioned
2018-06-08T10:18:46Z
dc.date.available
2018-01-15T12:56:36.102Z
dc.identifier.uri
https://refubium.fu-berlin.de/handle/fub188/20229
dc.identifier.uri
http://dx.doi.org/10.17169/refubium-23534
dc.description.abstract
Ice-shelf basal melting is the largest contributor to the negative mass
balance of the Antarctic ice sheet. However, current implementations of
ice/ocean interactions in ice-sheet models disagree with the distribution of
sub-shelf melt and freezing rates revealed by recent observational studies.
Here we present a novel combination of a continental-scale ice flow model and
a calibration technique to derive the spatial distribution of basal melting
and freezing rates for the whole Antarctic ice-shelf system. The modelled ice-
sheet equilibrium state is evaluated against topographic and velocity
observations. Our high-resolution (10-km spacing) simulation predicts an
equilibrium ice-shelf basal mass balance of −1648.7 Gt a−1 that increases to
−1917.0 Gt a−1 when the observed ice-shelf thinning rates are taken into
account. Our estimates reproduce the complexity of the basal mass balance of
Antarctic ice shelves, providing a reference for parameterisations of sub-
shelf ocean/ice interactions in continental ice-sheet models. We perform a
sensitivity analysis to assess the effects of variations in the model set-up,
showing that the retrieved estimates of basal melting and freezing rates are
largely insensitive to changes in the internal model parameters, but respond
strongly to a reduction of model resolution and the uncertainty in the input
datasets.
en
dc.rights.uri
http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subject.ddc
500 Naturwissenschaften und Mathematik::550 Geowissenschaften, Geologie
dc.title
Melting and freezing under Antarctic ice shelves from a combination of ice-
sheet modelling and observations
dc.type
Wissenschaftlicher Artikel
dcterms.bibliographicCitation
Journal of Glaciology. - 63 (2017), 240, S. 731-744
dcterms.bibliographicCitation.doi
10.1017/jog.2017.42
dcterms.bibliographicCitation.url
http://doi.org/10.1017/jog.2017.42
refubium.affiliation
Geowissenschaften
de
refubium.mycore.fudocsId
FUDOCS_document_000000028806
refubium.resourceType.isindependentpub
no
refubium.mycore.derivateId
FUDOCS_derivate_000000009335
dcterms.accessRights.openaire
open access