Altitude distribution of tropospheric ozone over the northern hemisphere during 1996, simulated with a chemistry-general circulation model at two different horizontal resolutions

2001 ◽  
Vol 106 (D15) ◽  
pp. 17453-17469 ◽  
Author(s):  
A. S. Kentarchos ◽  
G. J. Roelofs ◽  
J. Lelieveld
Keyword(s):  
General Circulation Model ◽  
Northern Hemisphere ◽  
Tropospheric Ozone ◽  
General Circulation ◽  
Circulation Model ◽  
Altitude Distribution

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 Development of the global atmospheric chemistry general circulation model BCC-GEOS-Chem v1.0: model description and evaluation

2020 ◽  
Vol 13 (9) ◽  
pp. 3817-3838
Author(s):  
Xiao Lu ◽  
Lin Zhang ◽  
Tongwen Wu ◽  
Michael S. Long ◽  
Jun Wang ◽  
...  
Keyword(s):  
General Circulation Model ◽  
Atmospheric Chemistry ◽  
Tropospheric Ozone ◽  
General Circulation ◽  
Climate Models ◽  
Transport Model ◽  
Stratospheric Ozone ◽  
Circulation Model ◽  
Satellite Observations ◽  
Model Description

Abstract. Chemistry plays an indispensable role in investigations of the atmosphere; however, many climate models either ignore or greatly simplify atmospheric chemistry, limiting both their accuracy and their scope. We present the development and evaluation of the online global atmospheric chemical model BCC-GEOS-Chem v1.0, coupling the GEOS-Chem chemical transport model (CTM) as an atmospheric chemistry component in the Beijing Climate Center atmospheric general circulation model (BCC-AGCM). The GEOS-Chem atmospheric chemistry component includes detailed tropospheric HOx–NOx–volatile organic compounds–ozone–bromine–aerosol chemistry and online dry and wet deposition schemes. We then demonstrate the new capabilities of BCC-GEOS-Chem v1.0 relative to the base BCC-AGCM model through a 3-year (2012–2014) simulation with anthropogenic emissions from the Community Emissions Data System (CEDS) used in the Coupled Model Intercomparison Project Phase 6 (CMIP6). The model captures well the spatial distributions and seasonal variations in tropospheric ozone, with seasonal mean biases of 0.4–2.2 ppbv at 700–400 hPa compared to satellite observations and within 10 ppbv at the surface to 500 hPa compared to global ozonesonde observations. The model has larger high-ozone biases over the tropics which we attribute to an overestimate of ozone chemical production. It underestimates ozone in the upper troposphere which is likely due either to the use of a simplified stratospheric ozone scheme or to biases in estimated stratosphere–troposphere exchange dynamics. The model diagnoses the global tropospheric ozone burden, OH concentration, and methane chemical lifetime to be 336 Tg, 1.16×106 molecule cm−3, and 8.3 years, respectively, which is consistent with recent multimodel assessments. The spatiotemporal distributions of NO2, CO, SO2, CH2O, and aerosol optical depth are generally in agreement with satellite observations. The development of BCC-GEOS-Chem v1.0 represents an important step for the development of fully coupled earth system models (ESMs) in China.

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.

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