Revised predictions of the effect on stratospheric ozone of increasing atmospheric N2O and chlorofluoromethanes: A two-dimensional model study

1983 ◽  
Vol 17 (10) ◽  
pp. 1995-2000 ◽  
Author(s):  
R.C Whitten ◽  
W.J Borucki ◽  
H.T Woodward ◽  
L.A Capone ◽  
C.A Riegel✠
Keyword(s):  
Stratospheric Ozone ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Model Study ◽  
Two Dimensional Model

Model study of explosion-generated Rayleigh waves in a half space

1964 ◽  
Vol 54 (2) ◽  
pp. 475-484
Author(s):  
I. N. Gupta ◽  
C. Kisslinger
Keyword(s):  
Rayleigh Wave ◽  
Half Space ◽  
Rayleigh Waves ◽  
Radial Component ◽  
Two Dimensional ◽  
Source Depth ◽  
Dimensional Model ◽  
Retrograde Motion ◽  
Model Study ◽  
Two Dimensional Model

ABSTRACT The Rayleigh waves generated by an explosion on or in the interior of a two-dimensional model show that the source acts as a downward impulse when the shot is on or just below the surface, and as a buried source of compression for deeper shots. The seismograms are in agreement with established theory for the line source on or in a half-space. The source depth corresponding to the reversal of polarity of the Rayleigh wave is small, and appears to be equal to the radius of the zone of inelastic failure around the shot. The polarity reversal is a true indication of a change in the mechanism of Rayleigh wave generation, and is not related to the change from retrograde motion at the free surface to prograde motion in the interior associated with the change in sign of the radial component at depth.

Thermal structure of the Venus ionosphere: A two-dimensional model study

1986 ◽  
Vol 13 (1) ◽  
pp. 10-13 ◽  
Author(s):  
R. C. Whitten ◽  
R. P. Singhal ◽  
W. C. Knudsen
Keyword(s):  
Thermal Structure ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Model Study ◽  
Two Dimensional Model

Modelling the global sources and sinks of radiatively active gases

1995 ◽  
Vol 351 (1696) ◽  
pp. 397-411 ◽  
Keyword(s):  
Numerical Models ◽  
Stratospheric Ozone ◽  
Trace Gases ◽  
Three Dimensional ◽  
Relative Importance ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Sources And Sinks ◽  
Two Dimensional Model

The use of numerical models in understanding the budgets of atmospheric trace gases is discussed. The budget of methane is calculated in a two-dimensional model. The contrasting behaviour of the Northern and Southern Hemisphere reflects changes in the relative importance of emissions, transport and chemistry. Models can also be used to test hypotheses. An example of such a study is presented in which it is shown that changes in stratospheric ozone could have played a significant role in the dramatic change in methane trend observed in the early 1990s. Finally, use of a three-dimensional model to study tropospheric trace gases is introduced.

Implications of smaller concentrations of stratospheric OH: A two-dimensional model study of ozone perturbations

1981 ◽  
Vol 15 (9) ◽  
pp. 1583-1589 ◽  
Author(s):  
R.C. Whitten ◽  
W.J. Borucki ◽  
H.T. Woodward ◽  
L.A. Capone ◽  
C.A. Riegel ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Dimensional Model ◽  
Model Study ◽  
Two Dimensional Model

Reduction of Stratospheric Ozone from High-flying Aircraft, Studied in a Two-dimensional Photochemical Model with Transport

1974 ◽  
Vol 52 (8) ◽  
pp. 1592-1598 ◽  
Author(s):  
Eigil Hesstvedt
Keyword(s):  
Reasonable Agreement ◽  
Column Density ◽  
Stratospheric Ozone ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Supersonic Aircraft ◽  
Stratospheric Ozone Layer ◽  
Two Dimensional Model ◽  
Flight Level ◽  
Ozone Column

A steady state two-dimensional model of the stratospheric ozone layer is presented. Chemical reactions involving oxygen, hydrogen, and nitrogen are considered along with the effect of a parameterized, two-dimensional transport, by mean motion and by eddies. The model is in reasonable agreement with observed ozone data. The reduction of ozone from emission of NOx from high flying aircraft is studied, assuming a fleet of 500 supersonic aircraft in transatlantic operation, flying at given altitudes. The effect is found to depend critically upon flight level. For mid-latitude, summer, the ozone column density is reduced by 0.3% for a flight level of 18 km. For flight levels of 23 and 28 km the reduction is 2 and 5%, respectively. Accordingly, the increase in u.v. radiation amounts to approximately 0.6, 4, and 10% for the same flight levels.

Dynamics of the Venus ionosphere: A two-dimensional model study

Icarus ◽  
1984 ◽  
Vol 60 (2) ◽  
pp. 317-326 ◽  
Author(s):  
R.C. Whitten ◽  
P.T. McCormick ◽  
D. Merritt ◽  
K.W. Thompson ◽  
R.R. Brynsvold ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Dimensional Model ◽  
Model Study ◽  
Two Dimensional Model
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