A study of the small ice cap instability in the presence of fluctuations
Vita. Phenomena associated with the small ice cap instability (SICI) are investigated using a general circulation model (GCM: NCAR Community Climate Model version 0) and a noise forced energy balance model (EBM). With idealized boundary conditions consisting of an all land planet without topography...
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fttexasamuniv:oai:oaktrust.library.tamu.edu:1969.1/DISSERTATIONS-1520060 2023-07-16T03:58:59+02:00 A study of the small ice cap instability in the presence of fluctuations Lee, Wan-Ho North, Gerald R. Newton, H. Joseph Panetta, R. Lee Reid, Robert O. Wilheit, Thomas T. 1993 xiv, 125 leaves electronic application/pdf reformatted digital https://hdl.handle.net/1969.1/DISSERTATIONS-1520060 eng eng Texas A&M University. Libraries https://hdl.handle.net/1969.1/DISSERTATIONS-1520060 34309206 This thesis was part of a retrospective digitization project authorized by the Texas A&M University Libraries. Copyright remains vested with the author(s). It is the user's responsibility to secure permission from the copyright holder(s) for re-use of the work beyond the provision of Fair Use. http://rightsstatements.org/vocab/InC/1.0/ Major meteorology 1993 Dissertation L4822 Thesis dissertations text 1993 fttexasamuniv 2023-06-27T23:02:59Z Vita. Phenomena associated with the small ice cap instability (SICI) are investigated using a general circulation model (GCM: NCAR Community Climate Model version 0) and a noise forced energy balance model (EBM). With idealized boundary conditions consisting of an all land planet without topography and mean annual insolation we generate four different climate regimes by altering the solar constant in the GCM: ice-free, partially ice-covered without ice-albedo feedback and with ice-albedo feedback and finally a totally ice-covered planet. The first and second moments of the resulting computed temperature fields for each case are presented. The ice-albedo feedback lengthens the characteristics scales both in spatial and temporal domains. Parameterization of the EBM is carried out by utilizing the output of GCM runs. It is found that the parameters of the EBM depend upon the solar constant. An analytical solution for the second moment statistics of temperature fields of linear EBM forced by noise which is homogeneous in space and white in time is presented and the results of numerical simulations including the nonlinear case are also presented. We find that the diffusivity of the EBM plays a similar role as the circulation strength of GCM; it modulates the equator-to-pole temperature difference and the magnitude of second moment variabilities. Non-white noises, spatially blue and temporally red, are introduced to lead to a better fit of the resulting characteristics of temperature fields generated by EBM to those by GCM. Multiple equilibrium states are found in the GCM in which, with two different initial conditions under identical boundary conditions, two different stable equilibria of partially ice-covered and totally ice-covered states are found. However for the regions where SICI might occur we do not find any multiple equilibria. The simulations with EBM have shown that SICI phenomena in the presence of fluctuations are strongly dependent on the amplitude of the noise forcing. When the strength of noise ... Thesis Ice cap Texas A&M University Digital Repository |
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Open Polar |
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Texas A&M University Digital Repository |
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English |
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Major meteorology 1993 Dissertation L4822 |
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Major meteorology 1993 Dissertation L4822 Lee, Wan-Ho A study of the small ice cap instability in the presence of fluctuations |
topic_facet |
Major meteorology 1993 Dissertation L4822 |
description |
Vita. Phenomena associated with the small ice cap instability (SICI) are investigated using a general circulation model (GCM: NCAR Community Climate Model version 0) and a noise forced energy balance model (EBM). With idealized boundary conditions consisting of an all land planet without topography and mean annual insolation we generate four different climate regimes by altering the solar constant in the GCM: ice-free, partially ice-covered without ice-albedo feedback and with ice-albedo feedback and finally a totally ice-covered planet. The first and second moments of the resulting computed temperature fields for each case are presented. The ice-albedo feedback lengthens the characteristics scales both in spatial and temporal domains. Parameterization of the EBM is carried out by utilizing the output of GCM runs. It is found that the parameters of the EBM depend upon the solar constant. An analytical solution for the second moment statistics of temperature fields of linear EBM forced by noise which is homogeneous in space and white in time is presented and the results of numerical simulations including the nonlinear case are also presented. We find that the diffusivity of the EBM plays a similar role as the circulation strength of GCM; it modulates the equator-to-pole temperature difference and the magnitude of second moment variabilities. Non-white noises, spatially blue and temporally red, are introduced to lead to a better fit of the resulting characteristics of temperature fields generated by EBM to those by GCM. Multiple equilibrium states are found in the GCM in which, with two different initial conditions under identical boundary conditions, two different stable equilibria of partially ice-covered and totally ice-covered states are found. However for the regions where SICI might occur we do not find any multiple equilibria. The simulations with EBM have shown that SICI phenomena in the presence of fluctuations are strongly dependent on the amplitude of the noise forcing. When the strength of noise ... |
author2 |
North, Gerald R. Newton, H. Joseph Panetta, R. Lee Reid, Robert O. Wilheit, Thomas T. |
format |
Thesis |
author |
Lee, Wan-Ho |
author_facet |
Lee, Wan-Ho |
author_sort |
Lee, Wan-Ho |
title |
A study of the small ice cap instability in the presence of fluctuations |
title_short |
A study of the small ice cap instability in the presence of fluctuations |
title_full |
A study of the small ice cap instability in the presence of fluctuations |
title_fullStr |
A study of the small ice cap instability in the presence of fluctuations |
title_full_unstemmed |
A study of the small ice cap instability in the presence of fluctuations |
title_sort |
study of the small ice cap instability in the presence of fluctuations |
publisher |
Texas A&M University. Libraries |
publishDate |
1993 |
url |
https://hdl.handle.net/1969.1/DISSERTATIONS-1520060 |
genre |
Ice cap |
genre_facet |
Ice cap |
op_relation |
https://hdl.handle.net/1969.1/DISSERTATIONS-1520060 34309206 |
op_rights |
This thesis was part of a retrospective digitization project authorized by the Texas A&M University Libraries. Copyright remains vested with the author(s). It is the user's responsibility to secure permission from the copyright holder(s) for re-use of the work beyond the provision of Fair Use. http://rightsstatements.org/vocab/InC/1.0/ |
_version_ |
1771546389589786624 |