 |
| Titel |
Atmospheric CO2 variations on millennial-scale during MIS 6 |
| VerfasserIn |
Jinhwa Shin, Roberto Grilli, Jérôme Chappellaz, Grégory Teste, Christoph Nehrbass-Ahles, Loïc Schmidely, Jochen Schmitt, Thomas Stocker, Hubertus Fischer |
| Konferenz |
EGU General Assembly 2017
|
| Medientyp |
Artikel
|
| Sprache |
en
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250148336
|
| Publikation (Nr.) |
 EGU/EGU2017-12581.pdf |
|
|
|
|
|
| Zusammenfassung |
| Understanding natural carbon cycle / climate feedbacks on various time scales is highly
important for predicting future climate changes. Paleoclimate records of Antarctic
temperatures, relative sea level and foraminiferal isotope and pollen records in sediment
cores from the Portuguese margin have shown climate variations on millennial
time scale over the Marine Isotope Stage 6 (MIS 6; from approximately 135 to 190
kyr BP). These proxy data suggested iceberg calving in the North Atlantic result
in cooling in the Northern hemisphere and warming in Antarctica by changes in
the Atlantic Meridional Overturning Circulation, which is explained by a bipolar
see-saw trend in the ocean (Margari et al., 2010). Atmospheric CO2 reconstruction
from Antarctic ice cores can provide key information on how atmospheric CO2
concentrations are linked to millennial-scale climate changes. However, existing CO2 records
cannot be used to address this relationship because of the lack of suitable temporal
resolution. In this work, we will present a new CO2 record with an improved time
resolution, obtained from the Dome C ice core (75˚ 06’S, 123˚ 24’E) spanning the
MIS 6 period, using dry extraction methods. We will examine millennial-scale
features in atmospheric CO2, and their possible links with other proxies covering MIS
6.
Margari, V., Skinner, L. C., Tzedakis, P. C., Ganopolski, A., Vautravers, M., and
Shackleton, N. J.: The nature of millennial scale climate variability during the past two
glacial periods, Nat.Geosci., 3, 127–131, 2010. |
|
|
|
|
|
|