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Role of seasonality in the evolution of climate during the last 100 million yearsA simple climate model has been used to calculate the effect of past changes in the land-sea distribution on the seasonal cycle of temperatures during the last 100 million years. Modeled summer temperature decreased over Greenland by more than 10 C and over Antarctica by 5 to 8 C. For the last 80 million years, this thermal response is comparable in magnitude to estimated atmospheric carbon dioxide effects. Analysis of paleontological data provides some support for the proposed hypothesis that large changes due to seasonality may have sometimes resulted in an ice-free state due to high summer temperatures rather than year-round warmth. Such 'cool' nonglacials may have prevailed for as much as one-third of the last 100 million years.
Document ID
19860040302
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Crowley, T. J.
(NASA Goddard Space Flight Center Greenbelt, MD; NSF, Washington, DC, United States)
Short, D. A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
North, G. R.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Mengel, J. G.
(Applied Research Corp. Landover, MD, United States)
Date Acquired
August 12, 2013
Publication Date
February 7, 1986
Publication Information
Publication: Science
Volume: 231
ISSN: 0036-8075
Subject Category
Geophysics
Accession Number
86A25040
Distribution Limits
Public
Copyright
Other

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