Numerical relationships between magnetic parameters measured in Quaternary sediments and global paleoclimatic proxies
a1_The complexity of most geological and geophysical problems prompts sometimes the use of non linear mathematical methods to handle them. An adaptive neuro fuzzy inference system (ANFIS) that combines fuzzy logic with neural networks, is applied here to study a paleoclimate section from the Quatern...
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ftczechacademysc:oai:kramerius.lib.cas.cz:uuid:54d7f953-0e72-4024-ba5f-92bcb4960a4d 2024-03-17T08:58:14+00:00 Numerical relationships between magnetic parameters measured in Quaternary sediments and global paleoclimatic proxies Peralta, Alfredo Costanzo-Alvarez, Vincenzo Carrillo, Eduardo Evert Durán, Leonardo Aldana, Milagrosa Rey, Daniel print https://kramerius.lib.cas.cz/view/uuid:54d7f953-0e72-4024-ba5f-92bcb4960a4d https://doi.org/10.1007/s11200-013-0809-7 unknown https://kramerius.lib.cas.cz/view/uuid:54d7f953-0e72-4024-ba5f-92bcb4960a4d doi:https://doi.org/10.1007/s11200-013-0809-7 policy:private geofyzika geophysics Holocene Neuro Fuzzy System paleoclimate rock magnetic properties 7 550 model:article ftczechacademysc https://doi.org/10.1007/s11200-013-0809-7 2024-02-19T23:34:17Z a1_The complexity of most geological and geophysical problems prompts sometimes the use of non linear mathematical methods to handle them. An adaptive neuro fuzzy inference system (ANFIS) that combines fuzzy logic with neural networks, is applied here to study a paleoclimate section from the Quaternary sedimentary fill of the Lake Mucubají (western Venezuela). The purpose of this work is to find a set of numerical relationships that could predict the possible connections between oxygen isotope (δ18O) values from two different locations in the northern hemisphere (Ammersee in southern Germany and an ice core from the Greenland Ice Core Project - GRIP) and rock-magnetic parameters measured in Mucubají samples (i.e. mass-specific magnetic susceptibility - χ, magnetic remanence S-ratio, mass-specific saturation isothermal remanent magnetization - SIRM and anhysteretic remanent magnetization - ARM). The best inferences in terms of coefficient of determionation R2 and the Root Mean-Square Error (RMSE) are obtained using those magnetic data as input that include information about magnetite grain size distributions, e.g., SIRM and ARM in FIS structures [1χ, 4ARM] and [4ARM, 1SIRM]. A comparison between Ammersee and GRIP actual data, as well as their corresponding inferences for the FIS structure [4ARM, 1SIRM], reveals a reasonable good inference of global trends for both records, overlooking the regional and/or local paleoclimate forcings that might have affected Ammersee. A better correlation between global isotope paleoclimate records and magnetic proxies, is perhaps prevented by the role played by local and regional paleoclimate and tectonism in Mucubají. We also argue that the ratio of ARM over SIRM appears to be related in a complex way to the onset and to the end of the Younger Dryas. a2_Our novel approach to the assessment of a specific paleoclimate case study shows the potential of the ANFIS technique in solving problems where traditional univariate and multivariate linear regression methods could prove ... Article in Journal/Newspaper Greenland Greenland ice core Greenland Ice core Project GRIP ice core Czech Academy of Sciences: dKNAV Greenland Studia Geophysica et Geodaetica 57 4 647 668 |
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Open Polar |
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Czech Academy of Sciences: dKNAV |
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ftczechacademysc |
language |
unknown |
topic |
geofyzika geophysics Holocene Neuro Fuzzy System paleoclimate rock magnetic properties 7 550 |
spellingShingle |
geofyzika geophysics Holocene Neuro Fuzzy System paleoclimate rock magnetic properties 7 550 Peralta, Alfredo Costanzo-Alvarez, Vincenzo Carrillo, Eduardo Evert Durán, Leonardo Aldana, Milagrosa Rey, Daniel Numerical relationships between magnetic parameters measured in Quaternary sediments and global paleoclimatic proxies |
topic_facet |
geofyzika geophysics Holocene Neuro Fuzzy System paleoclimate rock magnetic properties 7 550 |
description |
a1_The complexity of most geological and geophysical problems prompts sometimes the use of non linear mathematical methods to handle them. An adaptive neuro fuzzy inference system (ANFIS) that combines fuzzy logic with neural networks, is applied here to study a paleoclimate section from the Quaternary sedimentary fill of the Lake Mucubají (western Venezuela). The purpose of this work is to find a set of numerical relationships that could predict the possible connections between oxygen isotope (δ18O) values from two different locations in the northern hemisphere (Ammersee in southern Germany and an ice core from the Greenland Ice Core Project - GRIP) and rock-magnetic parameters measured in Mucubají samples (i.e. mass-specific magnetic susceptibility - χ, magnetic remanence S-ratio, mass-specific saturation isothermal remanent magnetization - SIRM and anhysteretic remanent magnetization - ARM). The best inferences in terms of coefficient of determionation R2 and the Root Mean-Square Error (RMSE) are obtained using those magnetic data as input that include information about magnetite grain size distributions, e.g., SIRM and ARM in FIS structures [1χ, 4ARM] and [4ARM, 1SIRM]. A comparison between Ammersee and GRIP actual data, as well as their corresponding inferences for the FIS structure [4ARM, 1SIRM], reveals a reasonable good inference of global trends for both records, overlooking the regional and/or local paleoclimate forcings that might have affected Ammersee. A better correlation between global isotope paleoclimate records and magnetic proxies, is perhaps prevented by the role played by local and regional paleoclimate and tectonism in Mucubají. We also argue that the ratio of ARM over SIRM appears to be related in a complex way to the onset and to the end of the Younger Dryas. a2_Our novel approach to the assessment of a specific paleoclimate case study shows the potential of the ANFIS technique in solving problems where traditional univariate and multivariate linear regression methods could prove ... |
format |
Article in Journal/Newspaper |
author |
Peralta, Alfredo Costanzo-Alvarez, Vincenzo Carrillo, Eduardo Evert Durán, Leonardo Aldana, Milagrosa Rey, Daniel |
author_facet |
Peralta, Alfredo Costanzo-Alvarez, Vincenzo Carrillo, Eduardo Evert Durán, Leonardo Aldana, Milagrosa Rey, Daniel |
author_sort |
Peralta, Alfredo |
title |
Numerical relationships between magnetic parameters measured in Quaternary sediments and global paleoclimatic proxies |
title_short |
Numerical relationships between magnetic parameters measured in Quaternary sediments and global paleoclimatic proxies |
title_full |
Numerical relationships between magnetic parameters measured in Quaternary sediments and global paleoclimatic proxies |
title_fullStr |
Numerical relationships between magnetic parameters measured in Quaternary sediments and global paleoclimatic proxies |
title_full_unstemmed |
Numerical relationships between magnetic parameters measured in Quaternary sediments and global paleoclimatic proxies |
title_sort |
numerical relationships between magnetic parameters measured in quaternary sediments and global paleoclimatic proxies |
url |
https://kramerius.lib.cas.cz/view/uuid:54d7f953-0e72-4024-ba5f-92bcb4960a4d https://doi.org/10.1007/s11200-013-0809-7 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Greenland ice core Greenland Ice core Project GRIP ice core |
genre_facet |
Greenland Greenland ice core Greenland Ice core Project GRIP ice core |
op_relation |
https://kramerius.lib.cas.cz/view/uuid:54d7f953-0e72-4024-ba5f-92bcb4960a4d doi:https://doi.org/10.1007/s11200-013-0809-7 |
op_rights |
policy:private |
op_doi |
https://doi.org/10.1007/s11200-013-0809-7 |
container_title |
Studia Geophysica et Geodaetica |
container_volume |
57 |
container_issue |
4 |
container_start_page |
647 |
op_container_end_page |
668 |
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