Expanding Greenland Ice Sheet Enhances Sensitivity of Plio-Pleistocene Climate to Obliquity Forcing in the Kiel Climate Model.

Song, Zhaoyang , Latif, Mojib and Park, Wonsun (2017) Expanding Greenland Ice Sheet Enhances Sensitivity of Plio-Pleistocene Climate to Obliquity Forcing in the Kiel Climate Model. Open Access Geophysical Research Letters, 44 (19). pp. 9957-9966. DOI 10.1002/2017GL074835.

[img]
Preview
Text
Song_et_al-2017-Geophysical_Research_Letters.pdf - Accepted Version

Download (1620Kb) | Preview
[img] Text
grl56490-sup-0001-Figure_S01.docx
Restricted to Registered users only

Download (4Mb) | Contact
[img] Text
grl56490.pdf - Published Version

Download (0b)

Supplementary data:

Abstract

Proxy data suggest the onset of Northern Hemisphere glaciation during the Plio-Pleistocene transition from 3.2 to 2.5 Ma resulted in enhanced climate variability at the obliquity (41 kyr) frequency. Here, we investigate the influence of the expanding Greenland ice sheet (GrIS) on the mean climate and obliquity-related variability in a series of climate model simulations. These suggest that an expanding GrIS weakens the Atlantic Meridional Overturning Circulation (AMOC) by ~1 Sv, mainly due to reduced heat loss in the Greenland-Iceland-Norwegian Sea. Moreover, the growing GrIS amplifies the Hadley circulation response to obliquity forcing driving variations in freshwater export from the tropical Atlantic and in turn variations of the AMOC. The stronger AMOC response to obliquity forcing, by about a factor of two, results in a stronger global-mean near-surface temperature response. We conclude that the AMOC response to obliquity forcing is important to understand the enhanced climate variability at the obliquity frequency during the Plio-Pleistocene transition.

Document Type: Article
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-ME Maritime Meteorology
OceanRep > The Future Ocean - Cluster of Excellence > FO-R11
Kiel University
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1002/2017GL074835
ISSN: 0094-8276
Projects: Future Ocean, PalMod in-kind, KCM
Expeditions/Models/Experiments:
Date Deposited: 11 Oct 2017 12:44
Last Modified: 23 Sep 2019 20:08
URI: http://oceanrep.geomar.de/id/eprint/39879

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...