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Bowman, Kenneth P. Huang, Jin 2011-05-07T12:55:52Z 2011-05-07T12:55:52Z 10000-01-01 1991 In this thesis, the sensitivity of the Earth's climate is studied by modeling past climatic variations with two-dimensional seasonal energy balance model. This thesis consists of two parts. The first part is a study of the interaction between the seasonal cycle and the small ice cap instability, which is a possible mechanism for the initiation of glaciation in the northern hemisphere and southern hemisphere. Results from a two-dimensional energy balance model with a realistic land-ocean distribution show that the small ice cap instability exists in the southern hemisphere, but not in the northern hemisphere. A series of experiments with a one-dimensional energy balance model with idealized geography is used to study the roles of the seasonal cycle and the land-ocean distribution. The results indicate that the seasonal cycle and land-ocean distribution can influence the strength of the albedo feedback, which is responsible for the small ice cap instability, through two factors: the temperature gradient and the amplitude of the seasonal cycle. The second part of this thesis is a study of the CO$\sb2$-climate feedback and its possible role in the 41 kyr sea surface temperature oscillation during the Matuyama chron (2.4 to 0.7 Myr BP). The CO$\sb2$-climate feedback is parameterized as an internal longwave radiation-polar temperature feedback in the energy balance model. Other physical processes are treated as boundary conditions. It is found that the CO$\sb2$-climate feedback can increase climate sensitivity to orbital parameters, especially to the obliquity changes, which have a 41 kyr cycle. The model results indicate that the CO$\sb2$-climate feedback is one of possible mechanisms for the dominant 41 kyr climate change during the Matuyama. (Abstract shortened with permission of author.) Made available in DSpace on 2011-05-07T12:55:52Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9210843.pdf: 4684861 bytes, checksum: 82e9af1e63c79ac052e09e5b7070d6b8 (MD5) Previous issue date: 1991 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:47:54Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:21:40-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission ETDs are only available to UIUC Users without author permission U of I Only AAI9210843 (UMI)AAI9210843 http://hdl.handle.net/2142/21016 eng Copyright 1991 Huang, Jin Physical Oceanography Paleoecology Physics, Atmospheric Science Climate sensitivity study with energy balance models text Atmospheric Science Atmospheric Science University of Illinois at Urbana-Champaign Dissertation Ph.D.