Aerosol deposited in East Antarctica over the last glacial cycle: detailed apportionment of continental and sea-salt contributions
The major ions, sodium (Na+), calcium (Ca2+), and chloride (Cl−), deposited in central Antarctica and preserved in ice cores originate from both marine and continental sources. They provide important proxy records, helping to reconstruct past climatic processes. However, it is difficult to clearly s...
Published in: | Journal of Geophysical Research |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
American Geophysical Union
2006
|
Subjects: | |
Online Access: | http://nora.nerc.ac.uk/id/eprint/22/ |
id |
ftnerc:oai:nora.nerc.ac.uk:22 |
---|---|
record_format |
openpolar |
spelling |
ftnerc:oai:nora.nerc.ac.uk:22 2024-06-09T07:40:25+00:00 Aerosol deposited in East Antarctica over the last glacial cycle: detailed apportionment of continental and sea-salt contributions Bigler, Matthias Rothlisberger, Regine Lambert, Fabrice Stocker, Thomas F. Wagenbach, Dietmar 2006 http://nora.nerc.ac.uk/id/eprint/22/ unknown American Geophysical Union Bigler, Matthias; Rothlisberger, Regine; Lambert, Fabrice; Stocker, Thomas F.; Wagenbach, Dietmar. 2006 Aerosol deposited in East Antarctica over the last glacial cycle: detailed apportionment of continental and sea-salt contributions. Journal of Geophysical Research, 111 (D8), D08205. 14, pp. https://doi.org/10.1029/2005JD006469 <https://doi.org/10.1029/2005JD006469> Glaciology Atmospheric Sciences Publication - Article PeerReviewed 2006 ftnerc https://doi.org/10.1029/2005JD006469 2024-05-15T08:39:04Z The major ions, sodium (Na+), calcium (Ca2+), and chloride (Cl−), deposited in central Antarctica and preserved in ice cores originate from both marine and continental sources. They provide important proxy records, helping to reconstruct past climatic processes. However, it is difficult to clearly separate the individual contributions from the two sources, particularly the continental one during glacial periods. On the basis of Na+ and Ca2+ records at an unprecedented resolution from the European Project for Ice Coring in Antarctica (EPICA) Dome C ice core back to the penultimate glacial period, mean ion mass ratios were deduced for the continental and the sea-salt aerosol body over East Antarctica. The sea-salt ion mass ratios are in the range predicted for both wind-induced bubble bursting of breaking waves on the open ocean and sea ice brine-derived aerosols, respectively, thus allowing no clear decision on the contribution of sea ice to the central Antarctic sea-salt aerosol. The continental ion mass ratios point to a substantial contribution by halide aerosols, which is in agreement with the source properties in southern South America, although these ratios do not rule out the continental shelf exposed during glacial stages as an additional source. While during cold glacial periods continental sources accounted for more than 90% of the total Ca2+ input, this contribution was highly variable during the remaining glacial periods covarying with the Antarctic warm events. During the Holocene it was less than 50%, but it was significantly higher during the last interglacial period. The sea-salt aerosol contribution to the total Na+ input, which was mostly dominant and higher than 90%, was reduced to only two thirds during the last two glacial maxima and the period around 60 ka. Thus the glacial continental Na+ contribution appears to be more important than previously assumed, implying that Na+ records not corrected for continental Na+ do not represent a pure marine signal at the East Antarctic plateau during ... Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica EPICA ice core Sea ice Natural Environment Research Council: NERC Open Research Archive Antarctic East Antarctica The Antarctic Journal of Geophysical Research 111 D8 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Glaciology Atmospheric Sciences |
spellingShingle |
Glaciology Atmospheric Sciences Bigler, Matthias Rothlisberger, Regine Lambert, Fabrice Stocker, Thomas F. Wagenbach, Dietmar Aerosol deposited in East Antarctica over the last glacial cycle: detailed apportionment of continental and sea-salt contributions |
topic_facet |
Glaciology Atmospheric Sciences |
description |
The major ions, sodium (Na+), calcium (Ca2+), and chloride (Cl−), deposited in central Antarctica and preserved in ice cores originate from both marine and continental sources. They provide important proxy records, helping to reconstruct past climatic processes. However, it is difficult to clearly separate the individual contributions from the two sources, particularly the continental one during glacial periods. On the basis of Na+ and Ca2+ records at an unprecedented resolution from the European Project for Ice Coring in Antarctica (EPICA) Dome C ice core back to the penultimate glacial period, mean ion mass ratios were deduced for the continental and the sea-salt aerosol body over East Antarctica. The sea-salt ion mass ratios are in the range predicted for both wind-induced bubble bursting of breaking waves on the open ocean and sea ice brine-derived aerosols, respectively, thus allowing no clear decision on the contribution of sea ice to the central Antarctic sea-salt aerosol. The continental ion mass ratios point to a substantial contribution by halide aerosols, which is in agreement with the source properties in southern South America, although these ratios do not rule out the continental shelf exposed during glacial stages as an additional source. While during cold glacial periods continental sources accounted for more than 90% of the total Ca2+ input, this contribution was highly variable during the remaining glacial periods covarying with the Antarctic warm events. During the Holocene it was less than 50%, but it was significantly higher during the last interglacial period. The sea-salt aerosol contribution to the total Na+ input, which was mostly dominant and higher than 90%, was reduced to only two thirds during the last two glacial maxima and the period around 60 ka. Thus the glacial continental Na+ contribution appears to be more important than previously assumed, implying that Na+ records not corrected for continental Na+ do not represent a pure marine signal at the East Antarctic plateau during ... |
format |
Article in Journal/Newspaper |
author |
Bigler, Matthias Rothlisberger, Regine Lambert, Fabrice Stocker, Thomas F. Wagenbach, Dietmar |
author_facet |
Bigler, Matthias Rothlisberger, Regine Lambert, Fabrice Stocker, Thomas F. Wagenbach, Dietmar |
author_sort |
Bigler, Matthias |
title |
Aerosol deposited in East Antarctica over the last glacial cycle: detailed apportionment of continental and sea-salt contributions |
title_short |
Aerosol deposited in East Antarctica over the last glacial cycle: detailed apportionment of continental and sea-salt contributions |
title_full |
Aerosol deposited in East Antarctica over the last glacial cycle: detailed apportionment of continental and sea-salt contributions |
title_fullStr |
Aerosol deposited in East Antarctica over the last glacial cycle: detailed apportionment of continental and sea-salt contributions |
title_full_unstemmed |
Aerosol deposited in East Antarctica over the last glacial cycle: detailed apportionment of continental and sea-salt contributions |
title_sort |
aerosol deposited in east antarctica over the last glacial cycle: detailed apportionment of continental and sea-salt contributions |
publisher |
American Geophysical Union |
publishDate |
2006 |
url |
http://nora.nerc.ac.uk/id/eprint/22/ |
geographic |
Antarctic East Antarctica The Antarctic |
geographic_facet |
Antarctic East Antarctica The Antarctic |
genre |
Antarc* Antarctic Antarctica East Antarctica EPICA ice core Sea ice |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica EPICA ice core Sea ice |
op_relation |
Bigler, Matthias; Rothlisberger, Regine; Lambert, Fabrice; Stocker, Thomas F.; Wagenbach, Dietmar. 2006 Aerosol deposited in East Antarctica over the last glacial cycle: detailed apportionment of continental and sea-salt contributions. Journal of Geophysical Research, 111 (D8), D08205. 14, pp. https://doi.org/10.1029/2005JD006469 <https://doi.org/10.1029/2005JD006469> |
op_doi |
https://doi.org/10.1029/2005JD006469 |
container_title |
Journal of Geophysical Research |
container_volume |
111 |
container_issue |
D8 |
_version_ |
1801383826910347264 |