Enregistré dans:
| Auteurs principaux: | , , , |
|---|---|
| Format: | Dataset Open Access |
| Langue: | en |
| Publié: |
PANGAEA
2010
|
| Sujets: | |
| Accès en ligne: | https://doi.org/10.1594/PANGAEA.786701 |
| Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
| _version_ | 1867169506332246016 |
|---|---|
| author | Étourneau, Johan Schneider, Ralph R Blanz, Thomas Martinez, Philippe |
| author_facet | Étourneau, Johan Schneider, Ralph R Blanz, Thomas Martinez, Philippe |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | When comparing new sea surface temperature (SST) records between the western and eastern equatorial Pacific spanning the last 3.2 Ma, we found that the zonal temperature gradient over the entire tropical Pacific irreversibly increased by 3 to 4 °C from 2.2 to 2.0 Ma. Here, we suggest a pronounced increase in atmospheric circulation from a weak to a strong zonal Walker circulation (WC) during the early Pleistocene. Evidence from other oceanic areas also suggests a strengthening in the meridional Hadley circulation (HC) during the same time period. Therefore, we also suggest that the invigoration of both atmospheric circulation patterns was intimately coupled during the Plio-Pleistocene transition, and likely linked to a shrinkage in the zonal extension of the tropical to subtropical warm-sphere associated with a prominent increase in the pole to equator temperature gradient. Our conclusion refutes assumptions that the intensification of atmospheric circulation in the tropics and subtropics significantly contributed to the initiation of continental ice sheet formation at high latitudes, since the onset of extensive Northern Hemisphere Glaciation (NHG) occurred ~2.75 Ma ago, in the late Pliocene. Instead, the development of a stronger atmospheric circulation ~2.2-2.0 Ma ago could have significantly contributed to the Plio-Pleistocene climate cooling. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_786701 |
| institution | PANGAEA |
| language | en |
| publishDate | 2010 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Sea surface temperature reconstruction for the Pliocene-Pleistocene climate transition Étourneau, Johan Schneider, Ralph R Blanz, Thomas Martinez, Philippe Ocean Drilling Program; ODP When comparing new sea surface temperature (SST) records between the western and eastern equatorial Pacific spanning the last 3.2 Ma, we found that the zonal temperature gradient over the entire tropical Pacific irreversibly increased by 3 to 4 °C from 2.2 to 2.0 Ma. Here, we suggest a pronounced increase in atmospheric circulation from a weak to a strong zonal Walker circulation (WC) during the early Pleistocene. Evidence from other oceanic areas also suggests a strengthening in the meridional Hadley circulation (HC) during the same time period. Therefore, we also suggest that the invigoration of both atmospheric circulation patterns was intimately coupled during the Plio-Pleistocene transition, and likely linked to a shrinkage in the zonal extension of the tropical to subtropical warm-sphere associated with a prominent increase in the pole to equator temperature gradient. Our conclusion refutes assumptions that the intensification of atmospheric circulation in the tropics and subtropics significantly contributed to the initiation of continental ice sheet formation at high latitudes, since the onset of extensive Northern Hemisphere Glaciation (NHG) occurred ~2.75 Ma ago, in the late Pliocene. Instead, the development of a stronger atmospheric circulation ~2.2-2.0 Ma ago could have significantly contributed to the Plio-Pleistocene climate cooling. |
| title | Sea surface temperature reconstruction for the Pliocene-Pleistocene climate transition |
| topic | Ocean Drilling Program; ODP |
| url | https://doi.org/10.1594/PANGAEA.786701 |