| 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/3UHG6TP | |||
| Repository | sid.inpe.br/mtc-m21c/2019/12.10.11.41 | |||
| Last Update | 2021:02.25.16.14.48 (UTC) simone | |||
| Metadata Repository | sid.inpe.br/mtc-m21c/2019/12.10.11.41.07 | |||
| Metadata Last Update | 2021:02.25.16.14.49 (UTC) simone | |||
| Secondary Key | INPE--PRE/ | |||
| Citation Key | FadinaVBLSSBSA:2019:EfLoCl | |||
| Title | Effects of long-term climate changes and geochemical processes on mercury accumulation on South American and African margins during the last glacial/interglacial cycle  | |||
| Year | 2019 | |||
| Access Date | 2024, May 19 | |||
| Secondary Type | PRE CI | |||
| Number of Files | 1 | |||
| Size | 4630 KiB | |||
| 2. Context | ||||
| Author | 1 Fadina, Omotayo Anuoluwapo Fadina 2 Venancio, Igor Martins 3 Belém, André Luiz 4 Lessa, Douglas Villela de Oliveira 5 Silveira, Carla Semiramis 6 Santos, Thiago Pereira dos 7 Bertagnolli, Denise 8 Silva Filho, Emmanoel Vieira 9 Albuquerque, Ana Luiza | |||
| Group | 1 2 CGCPT-CGCPT-INPE-MCTIC-GOV-BR | |||
| Affiliation | 1 Universidade Federal Fluminense (UFF) 2 Instituto Nacional de Pesquisas Espaciais (INPE) 3 Universidade Federal Fluminense (UFF) 4 Universidade Federal Fluminense (UFF) 5 Universidade Federal Fluminense (UFF) 6 Universidade Federal Fluminense (UFF) 7 Universidade Federal Fluminense (UFF) 8 Universidade Federal Fluminense (UFF) 9 Universidade Federal Fluminense (UFF) | |||
| Author e-Mail Address | 1 2 igor.venancio@inpe.br | |||
| Conference Name | AGU Fall Meeting | |||
| Conference Location | San Francisco, CA | |||
| Date | 09-13 dec. | |||
| History (UTC) | 2019-12-10 11:41:07 :: 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 | Marine sediments from the Western and Eastern South Atlantic continental margins are used to reconstruct mercury (Hg) accumulation over the last glacial/interglacial cycle. Sediment core GL-1248, collected from the continental slope off northeastern Brazil, and sediment core ODP1077, retrieved from the Congo deep-sea fan area, both dated to the last 128 ka and 130 ka respectively. Mercury concentrations in GL-1248 ranged between 14.95 and 69.43ng/g, and varied with periodicities of 56 ka and 900 yr suggesting the presence of glacial-interglacial changes and millennial-scale variability respectively. Parallel trends of Hg and XRF-Fe plots suggest that following atmospheric Hg deposition onto the continent, Hg is incorporated with iron (Fe) minerals before transportation and eventual immobilization at the NE Brazil continental slope. Mercury concentrations in ODP1077 varied significantly, having concentrations between 23.12 ng/g and 256 ng/g, and its plot exhibits an anti-phase pattern with the Fe/Ca ratio plot, that distinguishes between periods of increased and decreased terrigenous material delivery. This inverse trend in the plots of mercury concentration and Fe/Ca ratio shows that during periods of increased (decreased) terrigenous material delivery, less (more) mercury accumulates in the marine sediment. Although Hg concentration is poorly correlated with total organic carbon (TOC), it correlates positively with XRF-Ca implying that marine organic matter played a significant role in mercury distribution and accumulation in the ODP1077 marine sediment core. Despite the fact that both marine sediment cores were retrieved from the tropics and cover the same glacial/interglacial periods, their mercury variations and the main drivers of mercury accumulations are dissimilar. Accordingly, we identified two different pathways by which mercury is incorporated into marine sediments for prolonged storage and inclusion in the global mercury biogeochemical cycle. The outcome of this study suggests that regional climate processes and geochemical conditions are essential to Hg variations in environmental archives. Another obvious finding is that the source of sedimentary organic carbon is a key determinant of their affinity for mercury. | |||
| Area | MET | |||
| Arrangement | urlib.net > Produção anterior à 2021 > CGCPT > Effects of long-term... | |||
| 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/3UHG6TP | |||
| zipped data URL | http://mtc-m21c.sid.inpe.br/zip/8JMKD3MGP3W34R/3UHG6TP | |||
| Language | en | |||
| Target File | fadina_effects.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 4 | |||
| 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 | ||||