Extraction of climatic signals from fossil organic compounds in marine sediments up to 11.7Ma old (IODP-U1318)
This study focuses on the extraction of climate signals and processes using a combined approach which includes the analysis of a high number of lipid molecules in marine sediments, and the chemometric analysis of the acquired data. Neutral and acidic fractions of marine sediments from site IODP-U1318 (south-west of the UK, Porcupine Seabight) were quantified by GC-MS. The alkenone unsaturation index, Uk'37, was estimated from the composition of C37 alkenones and it was then used for the estimation of sea surface temperatures (SST) for reference. Principal component analysis (PCA), explained 77.45% of the total data variance, and differentiated neutral fraction GC-MS total ion current (TIC) profiles according to SST values of the different sediment sections. GC-MS TIC chromatograms were correlated to sea surface temperatures (SST) by partial least squares regression (PLSR). The compounds more robustly in line with SST values at each sediment section explained 93% of the SST variance and they were identified using the variable importance in projection (VIP) scores method. The proposed approach enables an objective identification of organic compounds sensitive to SST variability throughout complete chromatographic profiles. As a result of this multivariate unbiased approach, lipid composition of sediments was differentiated between compounds of marine (long chain n-alkanes, long chain n-alkan-1-ols) and terrestrial (short chain n-alkan1-ols, alkenols, cholesterol, squalene) origin, whose concentrations were directly and inversely correlated to SST, respectively. © 2015 Elsevier B.V.
Main Authors: | , , , , |
---|---|
Other Authors: | |
Format: | artículo biblioteca |
Language: | English |
Published: |
Elsevier
2015-06-16
|
Subjects: | Chromatographic profiles, Climate marker, Early-middle Miocene, Partial least squares regression, Sea surface temperature, Variable importance in projection, |
Online Access: | http://hdl.handle.net/10261/134522 http://dx.doi.org/10.13039/501100003329 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
id |
dig-icm-es-10261-134522 |
---|---|
record_format |
koha |
spelling |
dig-icm-es-10261-1345222020-07-03T12:19:39Z Extraction of climatic signals from fossil organic compounds in marine sediments up to 11.7Ma old (IODP-U1318) Farrés, Mireia Martrat, Belen De Mol, Ben Grimalt, Joan O. Tauler, Romà Ministerio de Economía y Competitividad (España) Chromatographic profiles Climate marker Early-middle Miocene Partial least squares regression Sea surface temperature Variable importance in projection This study focuses on the extraction of climate signals and processes using a combined approach which includes the analysis of a high number of lipid molecules in marine sediments, and the chemometric analysis of the acquired data. Neutral and acidic fractions of marine sediments from site IODP-U1318 (south-west of the UK, Porcupine Seabight) were quantified by GC-MS. The alkenone unsaturation index, Uk'37, was estimated from the composition of C37 alkenones and it was then used for the estimation of sea surface temperatures (SST) for reference. Principal component analysis (PCA), explained 77.45% of the total data variance, and differentiated neutral fraction GC-MS total ion current (TIC) profiles according to SST values of the different sediment sections. GC-MS TIC chromatograms were correlated to sea surface temperatures (SST) by partial least squares regression (PLSR). The compounds more robustly in line with SST values at each sediment section explained 93% of the SST variance and they were identified using the variable importance in projection (VIP) scores method. The proposed approach enables an objective identification of organic compounds sensitive to SST variability throughout complete chromatographic profiles. As a result of this multivariate unbiased approach, lipid composition of sediments was differentiated between compounds of marine (long chain n-alkanes, long chain n-alkan-1-ols) and terrestrial (short chain n-alkan1-ols, alkenols, cholesterol, squalene) origin, whose concentrations were directly and inversely correlated to SST, respectively. © 2015 Elsevier B.V. Special thanks go to the program CONSOLIDER-INGENIO 2010 (GRACCIE, CSD2007-00067) and to Ministerio de Economía y Competitividad, Spain, for a grant to the research project CTQ2012-38616-C02-01. B. M. thanks the CSIC-Ramón y Cajal post-doctoral program RYC-2013-14073. Peer reviewed 2016-07-06T11:36:12Z 2016-07-06T11:36:12Z 2015-06-16 artículo http://purl.org/coar/resource_type/c_6501 Analytica Chimica Acta 879: 1-9(2015) http://hdl.handle.net/10261/134522 10.1016/j.aca.2015.04.051 http://dx.doi.org/10.13039/501100003329 en Postprint http://dx.doi.org/10.1016/j.aca.2015.04.051 Sí open Elsevier |
institution |
ICM ES |
collection |
DSpace |
country |
España |
countrycode |
ES |
component |
Bibliográfico |
access |
En linea |
databasecode |
dig-icm-es |
tag |
biblioteca |
region |
Europa del Sur |
libraryname |
Biblioteca del ICM España |
language |
English |
topic |
Chromatographic profiles Climate marker Early-middle Miocene Partial least squares regression Sea surface temperature Variable importance in projection Chromatographic profiles Climate marker Early-middle Miocene Partial least squares regression Sea surface temperature Variable importance in projection |
spellingShingle |
Chromatographic profiles Climate marker Early-middle Miocene Partial least squares regression Sea surface temperature Variable importance in projection Chromatographic profiles Climate marker Early-middle Miocene Partial least squares regression Sea surface temperature Variable importance in projection Farrés, Mireia Martrat, Belen De Mol, Ben Grimalt, Joan O. Tauler, Romà Extraction of climatic signals from fossil organic compounds in marine sediments up to 11.7Ma old (IODP-U1318) |
description |
This study focuses on the extraction of climate signals and processes using a combined approach which includes the analysis of a high number of lipid molecules in marine sediments, and the chemometric analysis of the acquired data. Neutral and acidic fractions of marine sediments from site IODP-U1318 (south-west of the UK, Porcupine Seabight) were quantified by GC-MS. The alkenone unsaturation index, Uk'37, was estimated from the composition of C37 alkenones and it was then used for the estimation of sea surface temperatures (SST) for reference. Principal component analysis (PCA), explained 77.45% of the total data variance, and differentiated neutral fraction GC-MS total ion current (TIC) profiles according to SST values of the different sediment sections. GC-MS TIC chromatograms were correlated to sea surface temperatures (SST) by partial least squares regression (PLSR). The compounds more robustly in line with SST values at each sediment section explained 93% of the SST variance and they were identified using the variable importance in projection (VIP) scores method. The proposed approach enables an objective identification of organic compounds sensitive to SST variability throughout complete chromatographic profiles. As a result of this multivariate unbiased approach, lipid composition of sediments was differentiated between compounds of marine (long chain n-alkanes, long chain n-alkan-1-ols) and terrestrial (short chain n-alkan1-ols, alkenols, cholesterol, squalene) origin, whose concentrations were directly and inversely correlated to SST, respectively. © 2015 Elsevier B.V. |
author2 |
Ministerio de Economía y Competitividad (España) |
author_facet |
Ministerio de Economía y Competitividad (España) Farrés, Mireia Martrat, Belen De Mol, Ben Grimalt, Joan O. Tauler, Romà |
format |
artículo |
topic_facet |
Chromatographic profiles Climate marker Early-middle Miocene Partial least squares regression Sea surface temperature Variable importance in projection |
author |
Farrés, Mireia Martrat, Belen De Mol, Ben Grimalt, Joan O. Tauler, Romà |
author_sort |
Farrés, Mireia |
title |
Extraction of climatic signals from fossil organic compounds in marine sediments up to 11.7Ma old (IODP-U1318) |
title_short |
Extraction of climatic signals from fossil organic compounds in marine sediments up to 11.7Ma old (IODP-U1318) |
title_full |
Extraction of climatic signals from fossil organic compounds in marine sediments up to 11.7Ma old (IODP-U1318) |
title_fullStr |
Extraction of climatic signals from fossil organic compounds in marine sediments up to 11.7Ma old (IODP-U1318) |
title_full_unstemmed |
Extraction of climatic signals from fossil organic compounds in marine sediments up to 11.7Ma old (IODP-U1318) |
title_sort |
extraction of climatic signals from fossil organic compounds in marine sediments up to 11.7ma old (iodp-u1318) |
publisher |
Elsevier |
publishDate |
2015-06-16 |
url |
http://hdl.handle.net/10261/134522 http://dx.doi.org/10.13039/501100003329 |
work_keys_str_mv |
AT farresmireia extractionofclimaticsignalsfromfossilorganiccompoundsinmarinesedimentsupto117maoldiodpu1318 AT martratbelen extractionofclimaticsignalsfromfossilorganiccompoundsinmarinesedimentsupto117maoldiodpu1318 AT demolben extractionofclimaticsignalsfromfossilorganiccompoundsinmarinesedimentsupto117maoldiodpu1318 AT grimaltjoano extractionofclimaticsignalsfromfossilorganiccompoundsinmarinesedimentsupto117maoldiodpu1318 AT taulerroma extractionofclimaticsignalsfromfossilorganiccompoundsinmarinesedimentsupto117maoldiodpu1318 |
_version_ |
1777666441193979904 |