دورية أكاديمية
The effect of the Pliocene temperature pattern on silicate weathering and Pliocene–Pleistocene cooling
| العنوان: | The effect of the Pliocene temperature pattern on silicate weathering and Pliocene–Pleistocene cooling |
|---|---|
| المؤلفون: | P. Maffre, J. C. H. Chiang, N. L. Swanson-Hysell |
| المصدر: | Climate of the Past, Vol 19, Pp 1461-1479 (2023) |
| بيانات النشر: | Copernicus Publications, 2023. |
| سنة النشر: | 2023 |
| المجموعة: | LCC:Environmental pollution LCC:Environmental protection LCC:Environmental sciences |
| مصطلحات موضوعية: | Environmental pollution, TD172-193.5, Environmental protection, TD169-171.8, Environmental sciences, GE1-350 |
| الوصف: | The warmer early Pliocene climate featured changes to global sea surface temperature (SST) patterns, namely a reduction in the Equator–pole gradient and the east–west SST gradient in the tropical Pacific, the so-called “permanent El Niño”. Here we investigate the consequences of the SST changes to silicate weathering and thus to atmospheric CO2 on geological timescales. Different SST patterns than today imply regional modifications of the hydrological cycle that directly affect continental silicate weathering in particular over tropical “hotspots” of weathering, such as the Maritime Continent, thus leading to a “weatherability pattern effect”. We explore the impact of Pliocene-like SST changes on weathering using climate model and silicate weathering model simulations, and we deduce CO2 and temperature at carbon cycle equilibrium between solid Earth degassing and silicate weathering. In general, we find large regional increases and decreases in weathering fluxes, and the net effect depends on the extent to which they cancel. Permanent El Niño conditions lead to a small amplification of warming relative to the present day by 0.4 ∘C, suggesting that the demise of the permanent El Niño could have had a small amplifying effect on cooling from the early Pliocene into the Pleistocene. For the reduced Equator–pole gradient, the weathering increases and decreases largely cancel, leading to no detectable difference in global temperature at carbon cycle equilibrium. A robust SST reconstruction of the Pliocene is needed for a quantitative evaluation of the weatherability pattern effect. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 1814-9324 1814-9332 |
| Relation: | https://cp.copernicus.org/articles/19/1461/2023/cp-19-1461-2023.pdf; https://doaj.org/toc/1814-9324; https://doaj.org/toc/1814-9332 |
| DOI: | 10.5194/cp-19-1461-2023 |
| URL الوصول: | https://doaj.org/article/13de919271b144c39a8582acecf66bc4 |
| رقم الأكسشن: | edsdoj.13de919271b144c39a8582acecf66bc4 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 18149324 18149332 |
|---|---|
| DOI: | 10.5194/cp-19-1461-2023 |