Antarctic Temperature at Orbital Timescales Controlled by Local Summer Duration

DSpace/Manakin Repository

Antarctic Temperature at Orbital Timescales Controlled by Local Summer Duration

Citable link to this page

. . . . . .

Title: Antarctic Temperature at Orbital Timescales Controlled by Local Summer Duration
Author: Huybers, Peter John; Denton, George

Note: Order does not necessarily reflect citation order of authors.

Citation: Huybers, Peter J., and George Denton. 2008. Antarctic temperature at orbital timescales controlled by local summer duration. Nature Geoscience 1: 787-792.
Full Text & Related Files:
Abstract: During the late Pleistocene epoch, proxies for Southern Hemisphere climate from the Antarctic ice cores vary nearly in phase with Northern Hemisphere insolation intensity at the precession and obliquity timescales. This coherence has led to the suggestion that Northern Hemisphere insolation controls Antarctic climate. However, it is unclear what physical mechanisms would tie southern climate to northern insolation. Here we call on radiative equilibrium estimates to show that Antarctic climate could instead respond to changes in the duration of local summer. Simple radiative equilibrium dictates that warmer annual average atmospheric temperatures occur as a result of a longer summer, as opposed to a more intense one, because temperature is more sensitive to insolation when the atmosphere is cooler. Furthermore, we show that a single-column atmospheric model reproduces this radiative equilibrium effect when forced exclusively by local Antarctic insolation, generating temperature variations that are coherent and in phase with proxies of Antarctic atmospheric temperature and surface conditions. We conclude that the duration of Southern Hemisphere summer is more likely to control Antarctic climate than the intensity of Northern Hemisphere summer with which it (often misleadingly) covaries. In our view, near interhemispheric climate symmetry at the obliquity and precession timescales arises from a northern response to local summer intensity and a southern response to local summer duration.
Published Version: http://dx.doi.org/10.1038/ngeo311
Other Sources: http://www.people.fas.harvard.edu/~phuybers/
Terms of Use: This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAA
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:3355830

Show full Dublin Core record

This item appears in the following Collection(s)

  • FAS Scholarly Articles [6929]
    Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University
 
 

Search DASH


Advanced Search
 
 

Submitters