Study on the last deglaciation section of sediment core GeoB6211-2
Fuente:
PANGAEA
Salvato in:
| Autori principali: | , , , , , |
|---|---|
| Natura: | Dataset Open Access |
| Lingua: | en |
| Pubblicazione: |
PANGAEA
2005
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1867167667839827968 |
|---|---|
| author | Chiessi, Cristiano Mazur Mulitza, Stefan Paul, André Pätzold, Jürgen Groeneveld, Jeroen Wefer, Gerold |
| author_facet | Chiessi, Cristiano Mazur Mulitza, Stefan Paul, André Pätzold, Jürgen Groeneveld, Jeroen Wefer, Gerold |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | The North Atlantic Ocean underwent an abrupt temperature increase of 9 °C at high latitudes within a couple of decades during the transition from Heinrich event 1 (H1) to the Bølling warm event, but the mechanism responsible for this warming remains uncertain. Here we address this issue, presenting high-resolution last deglaciation planktic and benthic foraminiferal records of temperature and oxygen isotopic composition of seawater (d18OSW) for the subtropical South Atlantic. We identify a warming of ~6.5 °C and an increase in d18Osw of 1.2 per mil at the permanent thermocline during the transition, and a simultaneous warming of ~3.5 °C with no significant change in d18Osw at intermediate depths. Most of the warming can be explained by tilting the South Atlantic east-west isopycnals from a flattened toward a steepened position associated with a collapsed (H1) and strong (Bølling) Atlantic meridional overturning circulation (AMOC). However, this zonal seesaw explains an increase of just 0.3 per mil in permanent thermocline d18Osw. Considering that d18Osw at the South Atlantic permanent thermocline is strongly influenced by the inflow of salty Indian Ocean upper waters, we suggest that a strengthening in the Agulhas leakage took place at the transition from H1 to the Bølling, and was responsible for the change in d18Osw recorded in our site. Our records high-light the important role played by Indian-Atlantic interocean exchange as the trigger for the resumption of the AMOC and the Bølling warm event. of the AMOC and the Bølling warm event. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_779878 |
| institution | PANGAEA |
| language | en |
| publishDate | 2005 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Study on the last deglaciation section of sediment core GeoB6211-2 Chiessi, Cristiano Mazur Mulitza, Stefan Paul, André Pätzold, Jürgen Groeneveld, Jeroen Wefer, Gerold Argentine Basin; Center for Marine Environmental Sciences; GeoB6211-2; Gravity corer (Kiel type); M46/2; MARUM; Meteor (1986); SL The North Atlantic Ocean underwent an abrupt temperature increase of 9 °C at high latitudes within a couple of decades during the transition from Heinrich event 1 (H1) to the Bølling warm event, but the mechanism responsible for this warming remains uncertain. Here we address this issue, presenting high-resolution last deglaciation planktic and benthic foraminiferal records of temperature and oxygen isotopic composition of seawater (d18OSW) for the subtropical South Atlantic. We identify a warming of ~6.5 °C and an increase in d18Osw of 1.2 per mil at the permanent thermocline during the transition, and a simultaneous warming of ~3.5 °C with no significant change in d18Osw at intermediate depths. Most of the warming can be explained by tilting the South Atlantic east-west isopycnals from a flattened toward a steepened position associated with a collapsed (H1) and strong (Bølling) Atlantic meridional overturning circulation (AMOC). However, this zonal seesaw explains an increase of just 0.3 per mil in permanent thermocline d18Osw. Considering that d18Osw at the South Atlantic permanent thermocline is strongly influenced by the inflow of salty Indian Ocean upper waters, we suggest that a strengthening in the Agulhas leakage took place at the transition from H1 to the Bølling, and was responsible for the change in d18Osw recorded in our site. Our records high-light the important role played by Indian-Atlantic interocean exchange as the trigger for the resumption of the AMOC and the Bølling warm event. of the AMOC and the Bølling warm event. |
| title | Study on the last deglaciation section of sediment core GeoB6211-2 |
| topic | Argentine Basin; Center for Marine Environmental Sciences; GeoB6211-2; Gravity corer (Kiel type); M46/2; MARUM; Meteor (1986); SL |
| url | https://doi.org/10.1594/PANGAEA.779878 |