Repository logo
 
Publication

Influence of environmental variability and Emiliania huxleyi ecotypes on alkenone-derived temperature reconstructions in the subantarctic Southern Ocean

2022Journal article Open access
Simple item page
dc.contributor.authorRigual-Hernández, A.S.
dc.contributor.authorSierro, F.J.
dc.contributor.authorFlores, J.A.
dc.contributor.authorTrull, T.W.
dc.contributor.authorRodrigues, T.
dc.contributor.authorMartrat, B.
dc.contributor.authorSikes, E.L.
dc.contributor.authorNodder, S.D.
dc.contributor.authorEriksen, R.S.
dc.contributor.authorDavies, D.
dc.contributor.authorBravo, N.
dc.contributor.authorSánchez-Santos, J.M.
dc.contributor.authorAbrantes, F.
dc.date.accessioned2022-02-16T16:15:45Z
dc.date.available2022-02-16T16:15:45Z
dc.date.issued2022
dc.description.abstractLong-chain unsaturated alkenones produced by haptophyte algae are widely used as paleotemperature indicators. The unsaturation relationship to temperature is linear at mid-latitudes, however, non-linear responses detected in subpolar regions of both hemispheres have suggested complicating factors in these environments. To assess the influence of biotic and abiotic factors in alkenone production and preservation in the Subantarctic Zone, alkenone fluxes were quantified in three vertically-moored sediment traps deployed at the SOTS observatory (140°E, 47°S) during a year. Alkenone fluxes were compared with coccolithophore assemblages, satellite measurements and surface-water properties obtained by sensors at SOTS. Alkenone-based temperature reconstructions generally mirrored the seasonal variations of SSTs, except for late winter when significant deviations were observed (3–10 °C). Annual flux-weighted averages in the 3800 m trap returned alkenone-derived temperatures ~1.5 °C warmer than those derived from the 1000 m trap, a distortion attributed to surface production and signal preservation during its transit through the water column. Notably, changes in the relative abundance of E. huxleyi var. huxleyi were positively correlated with temperature deviations between the alkenone-derived temperatures and in situ SSTs (r = 0.6 and 0.7 at 1000 and 2000 m, respectively), while E. huxleyi var. aurorae, displayed an opposite trend. Our results suggest that E. huxleyi var. aurorae produces a higher proportion of C37:3 relative to C37:2 compared to its counterparts. Therefore, the dom inance of var. aurorae south of the Subtropical Front could be at least partially responsible for the less accurate alkenone-based SST reconstructions in the Southern Ocean using global calibrations. However, the observed correla tions were largely influenced by the samples collected during winter, a period characterized by low particle fluxes and slow sinking rates. Thus, it is likely that other factors such as selective degradation of the most unsaturated alkenones could also account for the deviations of the alkenone paleothermometer.pt_PT
dc.description.sponsorshipALG-01-0145-FEDER-022121; CGL2015-68459-P; POCI-01-0145-FEDER-022157
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.1016/j.scitotenv.2021.152474pt_PT
dc.identifier.eissn1879-1026
dc.identifier.urihttp://hdl.handle.net/10400.1/17565
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationSouthern Ocean Nanoplankton Response to CO2
dc.relationAlgarve Centre for Marine Sciences
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/pt_PT
dc.subjectZonas frontais polarespt_PT
dc.subjectPelotas fecais Zooplânctonpt_PT
dc.subjectAlkenones de cadeia longapt_PT
dc.subjectArmadilha de sedimentos de partículaspt_PT
dc.subjectNeve marinhapt_PT
dc.subjectEstimativa de paleotemperaturapt_PT
dc.subjectCalópico-de-Nannoplktonpt_PT
dc.subjectGephyrocapsa-oceanicapt_PT
dc.titleInfluence of environmental variability and Emiliania huxleyi ecotypes on alkenone-derived temperature reconstructions in the subantarctic Southern Oceanpt_PT
dc.title.alternativeInfluência da variabilidade ambiental e ecotipos emiliania huxleyi em reconstruções de temperatura derivadas de alkenona no oceano sul subantárticopt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleSouthern Ocean Nanoplankton Response to CO2
oaire.awardTitleAlgarve Centre for Marine Sciences
oaire.awardURIinfo:eu-repo/grantAgreement/EC/H2020/748690/EU
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F04326%2F2020/PT
oaire.citation.startPage152474pt_PT
oaire.citation.titleScience of The Total Environmentpt_PT
oaire.citation.volume812pt_PT
oaire.fundingStreamH2020
oaire.fundingStream6817 - DCRRNI ID
project.funder.identifierhttp://doi.org/10.13039/501100008530
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameEuropean Commission
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isProjectOfPublicatione87a97f4-0edb-4b9b-a2c7-e072f8e70bdd
relation.isProjectOfPublicationfafa76a6-2cd2-4a6d-a3c9-772f34d3b91f
relation.isProjectOfPublication.latestForDiscoverye87a97f4-0edb-4b9b-a2c7-e072f8e70bdd

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Influence of environmental variability and Emiliania huxleyi ecotypes on.pdf
Size:
2.81 MB
Format:
Adobe Portable Document Format
Download

Collections

CCM2-Artigos (em revistas ou actas indexadas)