Tropical Pacific response to continental ice sheet topography
Abstract
The last glacial maximum was marked by maximum land ice extent and lowest greenhouse gases concentration during the last ice age. We investigate the effect of glacial continental ice sheet topography on the large-scale tropical ocean–atmosphere climate, in particular the tropical Pacific, in an intermediate complexity coupled model. Increasing the thickness of continental ice sheets causes a southward displaced Pacific Intertropical Convergence Zone (ITCZ) and a strengthening (weakening) of northern (southern) hemisphere winter Hadley cell. The equatorial zonal sea surface temperature gradient weakened with an increased continental ice sheets thickness, the reduction being caused by cooling in the western equatorial Pacific and warming in the eastern equatorial Pacific. The evolution of the tropical climate with changing ice thickness has distinct quasi-linear and nonlinear parts. While the linear part is a direct response to the ice topographic changes, the nonlinear part was a finding of the tropical thermocline adjustment. Our analysis of a fully-coupled transient deglacial simulation strongly indicates the dominant role of ice sheet topography in determining the deglacial evolution of the simulated Pacific climate. The thickness of continental ice sheet, separate from ice albedo effect, has significant impact on the tropical ocean–atmosphere climate in particular with the meridional displacementmore »
- Authors:
-
- Academia Sinica, Taipei (Taiwan)
- Univ. of California, Berkeley, CA (United States)
- Texas A & M Univ., College Station, TX (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
- Sponsoring Org.:
- USDOE Office of Science (SC); National Science Foundation (NSF)
- OSTI Identifier:
- 1565277
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Climate Dynamics
- Additional Journal Information:
- Journal Volume: 44; Journal Issue: 9-10; Journal ID: ISSN 0930-7575
- Publisher:
- Springer-Verlag
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; Last glacial maximum; Ice sheet topography; Tropical Pacific thermal gradient; General circulation model
Citation Formats
Lee, Shih-Yu, Chiang, John C. H., and Chang, Ping. Tropical Pacific response to continental ice sheet topography. United States: N. p., 2014.
Web. doi:10.1007/s00382-014-2162-0.
Lee, Shih-Yu, Chiang, John C. H., & Chang, Ping. Tropical Pacific response to continental ice sheet topography. United States. https://doi.org/10.1007/s00382-014-2162-0
Lee, Shih-Yu, Chiang, John C. H., and Chang, Ping. Sat .
"Tropical Pacific response to continental ice sheet topography". United States. https://doi.org/10.1007/s00382-014-2162-0. https://www.osti.gov/servlets/purl/1565277.
@article{osti_1565277,
title = {Tropical Pacific response to continental ice sheet topography},
author = {Lee, Shih-Yu and Chiang, John C. H. and Chang, Ping},
abstractNote = {The last glacial maximum was marked by maximum land ice extent and lowest greenhouse gases concentration during the last ice age. We investigate the effect of glacial continental ice sheet topography on the large-scale tropical ocean–atmosphere climate, in particular the tropical Pacific, in an intermediate complexity coupled model. Increasing the thickness of continental ice sheets causes a southward displaced Pacific Intertropical Convergence Zone (ITCZ) and a strengthening (weakening) of northern (southern) hemisphere winter Hadley cell. The equatorial zonal sea surface temperature gradient weakened with an increased continental ice sheets thickness, the reduction being caused by cooling in the western equatorial Pacific and warming in the eastern equatorial Pacific. The evolution of the tropical climate with changing ice thickness has distinct quasi-linear and nonlinear parts. While the linear part is a direct response to the ice topographic changes, the nonlinear part was a finding of the tropical thermocline adjustment. Our analysis of a fully-coupled transient deglacial simulation strongly indicates the dominant role of ice sheet topography in determining the deglacial evolution of the simulated Pacific climate. The thickness of continental ice sheet, separate from ice albedo effect, has significant impact on the tropical ocean–atmosphere climate in particular with the meridional displacement in the Pacific ITCZ. The altered circulation states seen in the model may aid understanding of the relationship between tropical and high-latitude climate records in glacial-interglacial cycles.},
doi = {10.1007/s00382-014-2162-0},
journal = {Climate Dynamics},
number = 9-10,
volume = 44,
place = {United States},
year = {Sat May 17 00:00:00 EDT 2014},
month = {Sat May 17 00:00:00 EDT 2014}
}
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