Zonal wavenumber three traveling waves in the northern hemisphere of Mars simulated with a general circulation model

Icarus ◽  
2013 ◽  
Vol 223 (2) ◽  
pp. 654-676 ◽  
Author(s):  
Huiqun Wang ◽  
Mark I. Richardson ◽  
Anthony D. Toigo ◽  
Claire E. Newman
Keyword(s):  
General Circulation Model ◽  
Northern Hemisphere ◽  
Traveling Waves ◽  
General Circulation ◽  
Circulation Model ◽  
Zonal Wavenumber

scholarly journals Comparison of observed and general circulation model derived continental subsurface heat flux in the Northern Hemisphere

2010 ◽  
Vol 115 (D12) ◽  
Author(s):  
Andrew H. MacDougall ◽  
Hugo Beltrami ◽  
J. Fidel González-Rouco ◽  
M. Bruce Stevens ◽  
Evelise Bourlon
Keyword(s):  
Heat Flux ◽  
General Circulation Model ◽  
Northern Hemisphere ◽  
General Circulation ◽  
Circulation Model

scholarly journals Ice-Age Climate and Continental Ice Sheets: Some Experiments with A General Circulation Model

1984 ◽  
Vol 5 ◽  
pp. 100-105 ◽  
Author(s):  
S. Manabe ◽  
A. J. Broccoli
Keyword(s):  
North America ◽  
General Circulation Model ◽  
Northern Hemisphere ◽  
General Circulation ◽  
Ice Sheets ◽  
Ice Sheet ◽  
Circulation Model ◽  
Geological Evidence ◽  
The Difference ◽  
Continental Ice Sheets

The climatic influence of the land ice which existed 18 ka BP is investigated using a climate model developed at the Geophysical Fluid Dynamics Laboratory of the National Oceanic and Atmospheric Administration. The model consists of an atmospheric general circulation model coupled with a static mixed layer ocean model. Simulated climates are obtained from each of two versions of the model: one with the land-ice distribution of the present and the other with that of 18 ka BP.In the northern hemisphere, the difference in the distribution of sea surface temperature (SST) between the two experiments resembles the difference between the SST at 18 ka BP and at present as estimated by CLIMAP Project Members (1981). In the northern hemisphere a substantial lowering of air temperature also occurs in winter, with a less pronounced cooling during summer. The mid-tropospheric flow field is influenced by the Laurentide ice sheet and features a split jet stream straddling the ice sheet and a long wave trough along the east coast of North America. In the southern hemisphere of 18 ka BP, the ice sheet has little influence on temperature. An examination of hemispheric heat balances indicates that this is because only a small change in interhemispheric heat transport exists, as the In situ radiative compensation in the northern hemisphere counterbalances the effective reflection of solar radiation by continental ice sheets.Hydrologic changes in the model climate are also found, with statistically significant decreases in soil moisture occurring in a zone located to the south of the ice sheets in North America and Eurasia. These findings are consistent with some geological evidence of regionally drier climates from the last glacial maximum.

scholarly journals Response of Northern Hemisphere Midlatitude Circulation to Arctic Amplification in a Simple Atmospheric General Circulation Model

2016 ◽  
Vol 29 (6) ◽  
pp. 2041-2058 ◽  
Author(s):  
Yutian Wu ◽  
Karen L. Smith
Keyword(s):  
General Circulation Model ◽  
Northern Hemisphere ◽  
General Circulation ◽  
Atmospheric General Circulation Model ◽  
Polar Vortex ◽  
Circulation Model ◽  
Arctic Amplification ◽  
Stratospheric Polar Vortex ◽  
Atmospheric General Circulation ◽  
The Difference

Abstract This study examines the Northern Hemisphere midlatitude circulation response to Arctic amplification (AA) in a simple atmospheric general circulation model. It is found that, in response to AA, the tropospheric jet shifts equatorward and the stratospheric polar vortex weakens, robustly for various AA forcing strengths. Despite this, no statistically significant change in the frequency of sudden stratospheric warming events is identified. In addition, in order to quantitatively assess the role of stratosphere–troposphere coupling, the tropospheric pathway is isolated by nudging the stratospheric zonal mean state toward the reference state. When the nudging is applied, rendering the stratosphere inactive, the tropospheric jet still shifts equatorward but by approximately half the magnitude compared to that of an active stratosphere. The difference represents the stratospheric pathway and the downward influence of the stratosphere on the troposphere. This suggests that stratosphere–troposphere coupling plays a nonnegligible role in establishing the midlatitude circulation response to AA.

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