Back to Search
Start Over
Southern Ocean upwelling, Earth’s obliquity, and glacial-interglacial atmospheric CO 2 change
- Source :
- Science, Science, American Association for the Advancement of Science, 2020, 370 (6522), pp.1348-1352. ⟨10.1126/science.abd2115⟩, Science, 370 (6522, Science, 2020, 370 (6522), pp.1348-1352. ⟨10.1126/science.abd2115⟩
- Publication Year :
- 2020
- Publisher :
- HAL CCSD, 2020.
-
Abstract
- Previous studies have suggested that during the late Pleistocene ice ages, surface-deep exchange was somehow weakened in the Southern Ocean’s Antarctic Zone, which reduced the leakage of deeply sequestered carbon dioxide and thus contributed to the lower atmospheric carbon dioxide levels of the ice ages. Here, high-resolution diatom-bound nitrogen isotope measurements from the Indian sector of the Antarctic Zone reveal three modes of change in Southern Westerly Wind–driven upwelling, each affecting atmospheric carbon dioxide. Two modes, related to global climate and the bipolar seesaw, have been proposed previously. The third mode—which arises from the meridional temperature gradient as affected by Earth’s obliquity (axial tilt)—can explain the lag of atmospheric carbon dioxide behind climate during glacial inception and deglaciation. This obliquity-induced lag, in turn, makes carbon dioxide a delayed climate amplifier in the late Pleistocene glacial cycles.<br />info:eu-repo/semantics/published
- Subjects :
- [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere
Carbon dioxide in Earth's atmosphere
Multidisciplinary
010504 meteorology & atmospheric sciences
Pleistocene
010502 geochemistry & geophysics
01 natural sciences
Sciences de la terre et du cosmos
chemistry.chemical_compound
Oceanography
chemistry
13. Climate action
Interglacial
Carbon dioxide
Ice age
Deglaciation
Upwelling
14. Life underwater
Glacial period
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment
Geology
ComputingMilieux_MISCELLANEOUS
0105 earth and related environmental sciences
Subjects
Details
- Language :
- English
- ISSN :
- 00368075 and 10959203
- Database :
- OpenAIRE
- Journal :
- Science, Science, American Association for the Advancement of Science, 2020, 370 (6522), pp.1348-1352. ⟨10.1126/science.abd2115⟩, Science, 370 (6522, Science, 2020, 370 (6522), pp.1348-1352. ⟨10.1126/science.abd2115⟩
- Accession number :
- edsair.doi.dedup.....b6fb20a84d024f0e39d84378f446656b