| 1. Identity statement | ||||
| Reference Type | Conference Paper (Conference Proceedings) | |||
| Site | mtc-m21c.sid.inpe.br | |||
| Holder Code | isadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S | |||
| Identifier | 8JMKD3MGP3W34R/3UHG732 | |||
| Repository | sid.inpe.br/mtc-m21c/2019/12.10.11.42 | |||
| Last Update | 2021:02.23.13.52.53 (UTC) simone | |||
| Metadata Repository | sid.inpe.br/mtc-m21c/2019/12.10.11.42.50 | |||
| Metadata Last Update | 2021:02.23.13.52.54 (UTC) simone | |||
| Secondary Key | INPE--PRE/ | |||
| Citation Key | GonçalvesDiVeLeMuMaLu:2019:MiChBe | |||
| Title | Millennial-Scale Changes in Benthic Foraminifera Stable Carbon Isotope Gradients in the Western Equatorial Atlantic  | |||
| Year | 2019 | |||
| Access Date | 2024, May 19 | |||
| Secondary Type | PRE CI | |||
| Number of Files | 1 | |||
| Size | 77 KiB | |||
| 2. Context | ||||
| Author | 1 Gonçalves, Caio Souza 2 Dias, Bruna B. 3 Venancio, Igor Martins 4 Lessa, Douglas Villela de Oliveira 5 Mulitza, Stefan 6 Mackensen, Andreas 7 Luiza, Albuquerque Ana | |||
| Group | 1 2 3 CGCPT-CGCPT-INPE-MCTIC-GOV-BR | |||
| Affiliation | 1 Universidade Federal Fluminense (UFF) 2 Universidade Federal Fluminense (UFF) 3 Instituto Nacional de Pesquisas Espaciais (INPE) 4 Universidade Federal Fluminense (UFF) 5 University of Bremen 6 Alfred Wegner Institute for Polar and Marine Research 7 Universidade Federal Fluminense (UFF) | |||
| Author e-Mail Address | 1 2 3 igor.venancio@inpe.br | |||
| Conference Name | AGU Fall Meeting | |||
| Conference Location | San Francisco, CA | |||
| Date | 09-13 dec. | |||
| History (UTC) | 2019-12-10 11:42:50 :: simone -> administrator :: 2019-12-10 17:44:19 :: administrator -> simone :: 2019 | |||
| 3. Content and structure | ||||
| Is the master or a copy? | is the master | |||
| Content Stage | completed | |||
| Transferable | 1 | |||
| Content Type | External Contribution | |||
| Abstract | The stable carbon isotope ratio of benthic foraminifera (δ13C) is a widely applied proxy for ocean circulation and productivity changes, as the δ13C gradient between some species is linked to carbon export and bottom water oxygen concentration. Although there is some consensus about what could drive the variability of the oxygen concentration (such as the ocean circulation or the export of primary productivity), the mechanisms, especially in the Western Equatorial Atlantic (WEA), remain unexplained. To explore potential factors influencing bottom water [O2] over the last glacial period (63 to 29 kyr) in more detail, we analyzed the δ13C difference between three benthic foraminiferal species (Cibicides wuellerstorfi, Uvigerina peregrina, and Globobulimina affinis) from a site in the WEA. Our records demonstrate that the most prominent decreases in oxygen diffusion occurred during the Heinrich Stadials (HS) (especially HS3 and HS4) as a result of a reduced North Atlantic Deep Water (NADW) ventilation and increased fluvial terrigenous input. Our results show decreases in the strength of the bottom-water currents during these events, reflected by decreases in the sortable silt grain-size fraction (SS). Moreover, we show that the highest values of total organic carbon content (TOC) at our site during HS did not result from increased surface primary productivity but rather from continental input via the Parnaíba River. Furthermore, the highest TOC values are inconsistent with the gradient between two benthic foraminifera species (U. peregrina and C. wuellerstorfi), which reflects the low flux of labile organic carbon in the sediment. We suggest that the deposition and accumulation of terrigenous material reduced O2 diffusion into the sediment and, coupled with millennial-scale ventilation, played an important role in influencing the oxygen availability in the WEA during several HS over the last glaciation. | |||
| Area | MET | |||
| Arrangement | urlib.net > BDMCI > Fonds > Produção anterior à 2021 > CGCPT > Millennial-Scale Changes in... | |||
| doc Directory Content | access | |||
| source Directory Content | there are no files | |||
| agreement Directory Content |
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| 4. Conditions of access and use | ||||
| data URL | http://mtc-m21c.sid.inpe.br/ibi/8JMKD3MGP3W34R/3UHG732 | |||
| zipped data URL | http://mtc-m21c.sid.inpe.br/zip/8JMKD3MGP3W34R/3UHG732 | |||
| Language | en | |||
| Target File | goncalves_millenial.pdf | |||
| User Group | simone | |||
| Reader Group | administrator simone | |||
| Visibility | shown | |||
| Update Permission | not transferred | |||
| 5. Allied materials | ||||
| Mirror Repository | urlib.net/www/2017/11.22.19.04.03 | |||
| Next Higher Units | 8JMKD3MGPCW/3EUPEJL | |||
| Citing Item List | sid.inpe.br/bibdigital/2013/10.06.18.03 8 | |||
| Host Collection | urlib.net/www/2017/11.22.19.04 | |||
| 6. Notes | ||||
| Empty Fields | archivingpolicy archivist booktitle callnumber copyholder copyright creatorhistory descriptionlevel dissemination doi e-mailaddress edition editor format isbn issn keywords label lineage mark nextedition notes numberofvolumes orcid organization pages parameterlist parentrepositories previousedition previouslowerunit progress project publisher publisheraddress readpermission resumeid rightsholder schedulinginformation secondarydate secondarymark serieseditor session shorttitle sponsor subject tertiarymark tertiarytype type url versiontype volume | |||
| 7. Description control | ||||
| e-Mail (login) | simone | |||
| update | ||||