Ice core evidence for a recent increase in snow accumulation in coastal Dronning Maud Land, Antarctica
Ice cores provide temporal records of snow accumulation, a crucial component of Antarctic mass balance. Coastal areas are particularly under-represented in such records, despite their relatively high and sensitive accumulation rates. Here we present records from a 120 m ice core drilled on Derwael I...
Main Author: | |
---|---|
Format: | Conference Object |
Language: | English |
Published: |
2016
|
Subjects: | |
Online Access: | http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/249953 https://dipot.ulb.ac.be/dspace/bitstream/2013/249953/4/EGU2016-17418.pdf |
id |
ftunivbruxelles:oai:dipot.ulb.ac.be:2013/249953 |
---|---|
record_format |
openpolar |
spelling |
ftunivbruxelles:oai:dipot.ulb.ac.be:2013/249953 2023-05-15T13:58:15+02:00 Ice core evidence for a recent increase in snow accumulation in coastal Dronning Maud Land, Antarctica Philippe, Morgane 2016 1 full-text file(s): application/pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/249953 https://dipot.ulb.ac.be/dspace/bitstream/2013/249953/4/EGU2016-17418.pdf en eng local/EGU2016-17418 https://dipot.ulb.ac.be/dspace/bitstream/2013/249953/4/EGU2016-17418.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/249953 1 full-text file(s): info:eu-repo/semantics/restrictedAccess In: Geophysical Research Abstracts Sciences exactes et naturelles Climatologie Glaciologie info:eu-repo/semantics/conferencePaper info:ulb-repo/semantics/conferenceAbstract info:ulb-repo/semantics/openurl/document 2016 ftunivbruxelles 2022-06-12T21:51:28Z Ice cores provide temporal records of snow accumulation, a crucial component of Antarctic mass balance. Coastal areas are particularly under-represented in such records, despite their relatively high and sensitive accumulation rates. Here we present records from a 120 m ice core drilled on Derwael Ice Rise, coastal Dronning Maud Land (DML), East Antarctica in 2012. We date the ice core bottom back to 1745 ± 2 AD. δ18O and δD stratigraphy is supplemented by discontinuous major ion profiles, and verified independently by electrical conductivity measurements (ECM) to detect volcanic horizons. The resulting annual layer history is combined with the core density profile to calculate accumulation history, corrected for the influence of ice deformation. The mean longterm accumulation is 0.425 ± 0.035 m water equivalent (w.e.) a−1 (average corrected value). Reconstructed annual accumulation rates show an increase from 1955 onward to a mean value of 0.61 ± 0.02 m w.e. a−1 between 1955 and 2012. This trend is compared to other reported accumulation data in Antarctica, generally showing a high spatial variability. Applying the Community Earth System Model demonstrated that sea ice and atmosphere patterns largely explain the accumulation variability. This is the first and longest record from a coastal ice core in East Antarctica showing a steady increase during the 20th and 21st centuries, thereby confirming modelling predictions. 0 info:eu-repo/semantics/published Conference Object Antarc* Antarctic Antarctica DML Dronning Maud Land East Antarctica ice core Sea ice DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) Antarctic East Antarctica Dronning Maud Land |
institution |
Open Polar |
collection |
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
English |
topic |
Sciences exactes et naturelles Climatologie Glaciologie |
spellingShingle |
Sciences exactes et naturelles Climatologie Glaciologie Philippe, Morgane Ice core evidence for a recent increase in snow accumulation in coastal Dronning Maud Land, Antarctica |
topic_facet |
Sciences exactes et naturelles Climatologie Glaciologie |
description |
Ice cores provide temporal records of snow accumulation, a crucial component of Antarctic mass balance. Coastal areas are particularly under-represented in such records, despite their relatively high and sensitive accumulation rates. Here we present records from a 120 m ice core drilled on Derwael Ice Rise, coastal Dronning Maud Land (DML), East Antarctica in 2012. We date the ice core bottom back to 1745 ± 2 AD. δ18O and δD stratigraphy is supplemented by discontinuous major ion profiles, and verified independently by electrical conductivity measurements (ECM) to detect volcanic horizons. The resulting annual layer history is combined with the core density profile to calculate accumulation history, corrected for the influence of ice deformation. The mean longterm accumulation is 0.425 ± 0.035 m water equivalent (w.e.) a−1 (average corrected value). Reconstructed annual accumulation rates show an increase from 1955 onward to a mean value of 0.61 ± 0.02 m w.e. a−1 between 1955 and 2012. This trend is compared to other reported accumulation data in Antarctica, generally showing a high spatial variability. Applying the Community Earth System Model demonstrated that sea ice and atmosphere patterns largely explain the accumulation variability. This is the first and longest record from a coastal ice core in East Antarctica showing a steady increase during the 20th and 21st centuries, thereby confirming modelling predictions. 0 info:eu-repo/semantics/published |
format |
Conference Object |
author |
Philippe, Morgane |
author_facet |
Philippe, Morgane |
author_sort |
Philippe, Morgane |
title |
Ice core evidence for a recent increase in snow accumulation in coastal Dronning Maud Land, Antarctica |
title_short |
Ice core evidence for a recent increase in snow accumulation in coastal Dronning Maud Land, Antarctica |
title_full |
Ice core evidence for a recent increase in snow accumulation in coastal Dronning Maud Land, Antarctica |
title_fullStr |
Ice core evidence for a recent increase in snow accumulation in coastal Dronning Maud Land, Antarctica |
title_full_unstemmed |
Ice core evidence for a recent increase in snow accumulation in coastal Dronning Maud Land, Antarctica |
title_sort |
ice core evidence for a recent increase in snow accumulation in coastal dronning maud land, antarctica |
publishDate |
2016 |
url |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/249953 https://dipot.ulb.ac.be/dspace/bitstream/2013/249953/4/EGU2016-17418.pdf |
geographic |
Antarctic East Antarctica Dronning Maud Land |
geographic_facet |
Antarctic East Antarctica Dronning Maud Land |
genre |
Antarc* Antarctic Antarctica DML Dronning Maud Land East Antarctica ice core Sea ice |
genre_facet |
Antarc* Antarctic Antarctica DML Dronning Maud Land East Antarctica ice core Sea ice |
op_source |
In: Geophysical Research Abstracts |
op_relation |
local/EGU2016-17418 https://dipot.ulb.ac.be/dspace/bitstream/2013/249953/4/EGU2016-17418.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/249953 |
op_rights |
1 full-text file(s): info:eu-repo/semantics/restrictedAccess |
_version_ |
1766266441218129920 |