A model for large glacial-interglacial climate-induced changes in dust and sea salt concentrations in deep ice cores (central Antarctica): paleoclimatic implications and prospects for refining ice core chronologies
A semi-empirical model has been developed to reproduce glacial-interglacial changes of continental dust and marine sodium concentrations (factor of ~50 and ~5, respectively) observed in inland Antarctic ice cores. The model uses conceptual pathways of aerosols within the high troposphere; assumes th...
Published in: | Tellus B: Chemical and Physical Meteorology |
---|---|
Main Authors: | , |
Other Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley-Blackwell Publishing, Inc.
2009
|
Subjects: | |
Online Access: | http://hdl.handle.net/10281/6886 https://doi.org/10.1111/j.1600-0889.2009.00437.x |
id |
ftunivmilanobic:oai:boa.unimib.it:10281/6886 |
---|---|
record_format |
openpolar |
spelling |
ftunivmilanobic:oai:boa.unimib.it:10281/6886 2024-04-14T08:04:30+00:00 A model for large glacial-interglacial climate-induced changes in dust and sea salt concentrations in deep ice cores (central Antarctica): paleoclimatic implications and prospects for refining ice core chronologies Petit, JR DELMONTE, BARBARA Petit, J Delmonte, B 2009 STAMPA http://hdl.handle.net/10281/6886 https://doi.org/10.1111/j.1600-0889.2009.00437.x eng eng Wiley-Blackwell Publishing, Inc. country:US info:eu-repo/semantics/altIdentifier/wos/WOS:000270902600006 volume:61 issue:5 firstpage:768 lastpage:790 numberofpages:23 journal:TELLUS. SERIES B, CHEMICAL AND PHYSICAL METEOROLOGY http://hdl.handle.net/10281/6886 doi:10.1111/j.1600-0889.2009.00437.x info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-74249084056 paleoclimate stratigraphy dust ice core GEO/04 - GEOGRAFIA FISICA E GEOMORFOLOGIA info:eu-repo/semantics/article 2009 ftunivmilanobic https://doi.org/10.1111/j.1600-0889.2009.00437.x 2024-03-21T16:28:09Z A semi-empirical model has been developed to reproduce glacial-interglacial changes of continental dust and marine sodium concentrations (factor of ~50 and ~5, respectively) observed in inland Antarctic ice cores. The model uses conceptual pathways of aerosols within the high troposphere; assumes the dry deposition of impurities on the Antarctic surface; uses estimates of aerosol transit times taken independent of climate; assumes a temperature-dependent removal process during aerosol pathways from the mid-latitudes. The model is fitted to the data over the last four climate cycles from Vostok and EPICA Dome C Antarctic sites. As temperature is cooling, the aerosol response suggests different modes of climate couplings between latitudes, which can be continuous or below temperature thresholds for sodium and dust, respectively. The model estimates a southern South America dust source activity two to three times higher for glacial periods than for the Holocene and a glacial temperature over the Southern Ocean 3-5 °C cooler. Both estimates appear consistent with independent observations. After removal of temperature effects, dust and sodium residuals for both sites show orbital frequencies in opposite phase at the precession timescale. Such long-term insolation-related modulation of terrestrial and marine aerosol input, could provide a chemical pacemaker useful for refining ice core chronologies. © 2009 The Authors Journal compilation © 2009 Blackwell Munksgaard. Article in Journal/Newspaper Antarc* Antarctic Antarctica EPICA ice core Southern Ocean Università degli Studi di Milano-Bicocca: BOA (Bicocca Open Archive) Antarctic Southern Ocean The Antarctic Tellus B: Chemical and Physical Meteorology 61 5 768 790 |
institution |
Open Polar |
collection |
Università degli Studi di Milano-Bicocca: BOA (Bicocca Open Archive) |
op_collection_id |
ftunivmilanobic |
language |
English |
topic |
paleoclimate stratigraphy dust ice core GEO/04 - GEOGRAFIA FISICA E GEOMORFOLOGIA |
spellingShingle |
paleoclimate stratigraphy dust ice core GEO/04 - GEOGRAFIA FISICA E GEOMORFOLOGIA Petit, JR DELMONTE, BARBARA A model for large glacial-interglacial climate-induced changes in dust and sea salt concentrations in deep ice cores (central Antarctica): paleoclimatic implications and prospects for refining ice core chronologies |
topic_facet |
paleoclimate stratigraphy dust ice core GEO/04 - GEOGRAFIA FISICA E GEOMORFOLOGIA |
description |
A semi-empirical model has been developed to reproduce glacial-interglacial changes of continental dust and marine sodium concentrations (factor of ~50 and ~5, respectively) observed in inland Antarctic ice cores. The model uses conceptual pathways of aerosols within the high troposphere; assumes the dry deposition of impurities on the Antarctic surface; uses estimates of aerosol transit times taken independent of climate; assumes a temperature-dependent removal process during aerosol pathways from the mid-latitudes. The model is fitted to the data over the last four climate cycles from Vostok and EPICA Dome C Antarctic sites. As temperature is cooling, the aerosol response suggests different modes of climate couplings between latitudes, which can be continuous or below temperature thresholds for sodium and dust, respectively. The model estimates a southern South America dust source activity two to three times higher for glacial periods than for the Holocene and a glacial temperature over the Southern Ocean 3-5 °C cooler. Both estimates appear consistent with independent observations. After removal of temperature effects, dust and sodium residuals for both sites show orbital frequencies in opposite phase at the precession timescale. Such long-term insolation-related modulation of terrestrial and marine aerosol input, could provide a chemical pacemaker useful for refining ice core chronologies. © 2009 The Authors Journal compilation © 2009 Blackwell Munksgaard. |
author2 |
Petit, J Delmonte, B |
format |
Article in Journal/Newspaper |
author |
Petit, JR DELMONTE, BARBARA |
author_facet |
Petit, JR DELMONTE, BARBARA |
author_sort |
Petit, JR |
title |
A model for large glacial-interglacial climate-induced changes in dust and sea salt concentrations in deep ice cores (central Antarctica): paleoclimatic implications and prospects for refining ice core chronologies |
title_short |
A model for large glacial-interglacial climate-induced changes in dust and sea salt concentrations in deep ice cores (central Antarctica): paleoclimatic implications and prospects for refining ice core chronologies |
title_full |
A model for large glacial-interglacial climate-induced changes in dust and sea salt concentrations in deep ice cores (central Antarctica): paleoclimatic implications and prospects for refining ice core chronologies |
title_fullStr |
A model for large glacial-interglacial climate-induced changes in dust and sea salt concentrations in deep ice cores (central Antarctica): paleoclimatic implications and prospects for refining ice core chronologies |
title_full_unstemmed |
A model for large glacial-interglacial climate-induced changes in dust and sea salt concentrations in deep ice cores (central Antarctica): paleoclimatic implications and prospects for refining ice core chronologies |
title_sort |
model for large glacial-interglacial climate-induced changes in dust and sea salt concentrations in deep ice cores (central antarctica): paleoclimatic implications and prospects for refining ice core chronologies |
publisher |
Wiley-Blackwell Publishing, Inc. |
publishDate |
2009 |
url |
http://hdl.handle.net/10281/6886 https://doi.org/10.1111/j.1600-0889.2009.00437.x |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctica EPICA ice core Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica EPICA ice core Southern Ocean |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000270902600006 volume:61 issue:5 firstpage:768 lastpage:790 numberofpages:23 journal:TELLUS. SERIES B, CHEMICAL AND PHYSICAL METEOROLOGY http://hdl.handle.net/10281/6886 doi:10.1111/j.1600-0889.2009.00437.x info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-74249084056 |
op_doi |
https://doi.org/10.1111/j.1600-0889.2009.00437.x |
container_title |
Tellus B: Chemical and Physical Meteorology |
container_volume |
61 |
container_issue |
5 |
container_start_page |
768 |
op_container_end_page |
790 |
_version_ |
1796301059405119488 |