Natural periodicities and Northern Hemisphere–Southern Hemisphere connection of fast temperature changes during the last glacial period: EPICA and NGRIP revisited
We investigate both the European Project for Ice Coring in Antarctica Dronning Maud Land (EDML) and North Greenland Ice-Core Project (NGRIP) data sets to study both the time evolution of the so-called Dansgaard–Oeschger events and the dynamics at longer timescales during the last glacial period. Emp...
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ftdoajarticles:oai:doaj.org/article:e078573b277a4f27a49f271fba1f8d20 2023-05-15T13:42:06+02:00 Natural periodicities and Northern Hemisphere–Southern Hemisphere connection of fast temperature changes during the last glacial period: EPICA and NGRIP revisited T. Alberti F. Lepreti A. Vecchio E. Bevacqua V. Capparelli V. Carbone 2014-09-01T00:00:00Z https://doi.org/10.5194/cp-10-1751-2014 https://doaj.org/article/e078573b277a4f27a49f271fba1f8d20 EN eng Copernicus Publications http://www.clim-past.net/10/1751/2014/cp-10-1751-2014.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 1814-9324 1814-9332 doi:10.5194/cp-10-1751-2014 https://doaj.org/article/e078573b277a4f27a49f271fba1f8d20 Climate of the Past, Vol 10, Iss 5, Pp 1751-1762 (2014) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2014 ftdoajarticles https://doi.org/10.5194/cp-10-1751-2014 2022-12-31T06:20:07Z We investigate both the European Project for Ice Coring in Antarctica Dronning Maud Land (EDML) and North Greenland Ice-Core Project (NGRIP) data sets to study both the time evolution of the so-called Dansgaard–Oeschger events and the dynamics at longer timescales during the last glacial period. Empirical mode decomposition (EMD) is used to extract the proper modes of both the data sets. It is shown that the time behavior at the typical timescales of Dansgaard–Oeschger events is captured through signal reconstructions obtained by summing five EMD modes for NGRIP and four EMD modes for EDML. The reconstructions obtained by summing the successive modes can be used to describe the climate evolution at longer timescales, characterized by intervals in which Dansgaard–Oeschger events happen and intervals when these are not observed. Using EMD signal reconstructions and a simple model based on the one-dimensional Langevin equation, it is argued that the occurrence of a Dansgaard–Oeschger event can be described as an excitation of the climate system within the same state, while the longer timescale behavior appears to be due to transitions between different climate states. Finally, on the basis of a cross-correlation analysis performed on EMD reconstructions, evidence that the Antarctic climate changes lead those of Greenland by a lag of ≈ 3.05 kyr is presented. Article in Journal/Newspaper Antarc* Antarctic Antarctica Dansgaard-Oeschger events Dronning Maud Land EPICA Greenland Greenland ice core Greenland Ice core Project ice core NGRIP North Greenland North Greenland Ice Core Project Directory of Open Access Journals: DOAJ Articles Antarctic Dronning Maud Land Greenland The Antarctic Climate of the Past 10 5 1751 1762 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
spellingShingle |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 T. Alberti F. Lepreti A. Vecchio E. Bevacqua V. Capparelli V. Carbone Natural periodicities and Northern Hemisphere–Southern Hemisphere connection of fast temperature changes during the last glacial period: EPICA and NGRIP revisited |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
We investigate both the European Project for Ice Coring in Antarctica Dronning Maud Land (EDML) and North Greenland Ice-Core Project (NGRIP) data sets to study both the time evolution of the so-called Dansgaard–Oeschger events and the dynamics at longer timescales during the last glacial period. Empirical mode decomposition (EMD) is used to extract the proper modes of both the data sets. It is shown that the time behavior at the typical timescales of Dansgaard–Oeschger events is captured through signal reconstructions obtained by summing five EMD modes for NGRIP and four EMD modes for EDML. The reconstructions obtained by summing the successive modes can be used to describe the climate evolution at longer timescales, characterized by intervals in which Dansgaard–Oeschger events happen and intervals when these are not observed. Using EMD signal reconstructions and a simple model based on the one-dimensional Langevin equation, it is argued that the occurrence of a Dansgaard–Oeschger event can be described as an excitation of the climate system within the same state, while the longer timescale behavior appears to be due to transitions between different climate states. Finally, on the basis of a cross-correlation analysis performed on EMD reconstructions, evidence that the Antarctic climate changes lead those of Greenland by a lag of ≈ 3.05 kyr is presented. |
format |
Article in Journal/Newspaper |
author |
T. Alberti F. Lepreti A. Vecchio E. Bevacqua V. Capparelli V. Carbone |
author_facet |
T. Alberti F. Lepreti A. Vecchio E. Bevacqua V. Capparelli V. Carbone |
author_sort |
T. Alberti |
title |
Natural periodicities and Northern Hemisphere–Southern Hemisphere connection of fast temperature changes during the last glacial period: EPICA and NGRIP revisited |
title_short |
Natural periodicities and Northern Hemisphere–Southern Hemisphere connection of fast temperature changes during the last glacial period: EPICA and NGRIP revisited |
title_full |
Natural periodicities and Northern Hemisphere–Southern Hemisphere connection of fast temperature changes during the last glacial period: EPICA and NGRIP revisited |
title_fullStr |
Natural periodicities and Northern Hemisphere–Southern Hemisphere connection of fast temperature changes during the last glacial period: EPICA and NGRIP revisited |
title_full_unstemmed |
Natural periodicities and Northern Hemisphere–Southern Hemisphere connection of fast temperature changes during the last glacial period: EPICA and NGRIP revisited |
title_sort |
natural periodicities and northern hemisphere–southern hemisphere connection of fast temperature changes during the last glacial period: epica and ngrip revisited |
publisher |
Copernicus Publications |
publishDate |
2014 |
url |
https://doi.org/10.5194/cp-10-1751-2014 https://doaj.org/article/e078573b277a4f27a49f271fba1f8d20 |
geographic |
Antarctic Dronning Maud Land Greenland The Antarctic |
geographic_facet |
Antarctic Dronning Maud Land Greenland The Antarctic |
genre |
Antarc* Antarctic Antarctica Dansgaard-Oeschger events Dronning Maud Land EPICA Greenland Greenland ice core Greenland Ice core Project ice core NGRIP North Greenland North Greenland Ice Core Project |
genre_facet |
Antarc* Antarctic Antarctica Dansgaard-Oeschger events Dronning Maud Land EPICA Greenland Greenland ice core Greenland Ice core Project ice core NGRIP North Greenland North Greenland Ice Core Project |
op_source |
Climate of the Past, Vol 10, Iss 5, Pp 1751-1762 (2014) |
op_relation |
http://www.clim-past.net/10/1751/2014/cp-10-1751-2014.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 1814-9324 1814-9332 doi:10.5194/cp-10-1751-2014 https://doaj.org/article/e078573b277a4f27a49f271fba1f8d20 |
op_doi |
https://doi.org/10.5194/cp-10-1751-2014 |
container_title |
Climate of the Past |
container_volume |
10 |
container_issue |
5 |
container_start_page |
1751 |
op_container_end_page |
1762 |
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1766162635649187840 |