The Extended Canadian Middle Atmosphere Model

2000 ◽  
Vol 27 (16) ◽  
pp. 2529-2532 ◽  
Author(s):  
Stephen R. Beagley ◽  
Charles McLandress ◽  
Victor I. Fomichev ◽  
William E. Ward
Keyword(s):  
Middle Atmosphere ◽  
Atmosphere Model

scholarly journals Summertime stratospheric processes at northern mid-latitudes: comparisons between MANTRA balloon measurements and the Canadian Middle Atmosphere Model

2007 ◽  
Vol 7 (4) ◽  
pp. 11621-11646 ◽  
Author(s):  
S. M. L. Melo ◽  
R. Blatherwick ◽  
J. Davies ◽  
P. Fogal ◽  
J. de Grandpré ◽  
...  
Keyword(s):  
Middle Atmosphere ◽  
Polar Vortex ◽  
Late Summer ◽  
Atmospheric Nitrogen ◽  
Vertical Diffusion ◽  
Trend Assessment ◽  
Atmosphere Model ◽  
Vertical Diffusion Coefficient ◽  
Self Consistency ◽  
Balloon Measurements

Abstract. In this paper we report on a study conducted using the Middle Atmospheric Nitrogen TRend Assessment (MANTRA) balloon measurements of stratospheric constituents and temperature and the Canadian Middle Atmosphere Model (CMAM) in order to evaluate the ability of the model to reproduce the measured fields and to thereby test our ability to describe mid-latitude summertime stratospheric processes. The MANTRA measurements used here are vertical profiles of ozone, temperature, N2O, CH4, HNO3, and HCl obtained during four campaigns, involving the launch of both ozonesondes and large balloons from Vanscoy, Saskatchewan, Canada (52° N, 107° W). The campaigns were conducted in August and September 1998, 2000, 2002 and 2004. During late summer at mid-latitudes, the stratosphere is close to photochemical control, providing an ideal scenario for the study reported here. From this analysis we found that: (1) reducing the value for the vertical diffusion coefficient in CMAM to a more physically reasonable value results in the model better reproducing the measured profiles of long-lived species; (2) the existence of compact correlations among the constituents, as expected from independent measurements in the literature and from models, confirms the self-consistency of the MANTRA measurements; and (3) the 1998 ozone measurements show a narrow layer of low ozone centered near 25 km that is consistent with fossil debris from the polar vortex, suggesting that localized springtime ozone anomalies can persist through summer, affecting ozone levels at mid-latitudes.

scholarly journals Summertime stratospheric processes at northern mid-latitudes: comparisons between MANTRA balloon measurements and the Canadian Middle Atmosphere Model

2008 ◽  
Vol 8 (7) ◽  
pp. 2057-2071 ◽  
Author(s):  
S. M. L. Melo ◽  
R. Blatherwick ◽  
J. Davies ◽  
P. Fogal ◽  
J. de Grandpré ◽  
...  
Keyword(s):  
Middle Atmosphere ◽  
Chemical Species ◽  
Late Summer ◽  
Vertical Diffusion ◽  
Long Term Trends ◽  
Trend Assessment ◽  
Atmosphere Model ◽  
Vertical Diffusion Coefficient ◽  
Balloon Measurements

Abstract. In this paper we report on a study conducted using the Middle Atmospheric Nitrogen TRend Assessment (MANTRA) balloon measurements of stratospheric constituents and temperature and the Canadian Middle Atmosphere Model (CMAM). Three different kinds of data are used to assess the inter-consistency of the combined dataset: single profiles of long-lived species from MANTRA 1998, sparse climatologies from the ozonesonde measurements during the four MANTRA campaigns and from HALOE satellite measurements, and the CMAM climatology. In doing so, we evaluate the ability of the model to reproduce the measured fields and to thereby test our ability to describe mid-latitude summertime stratospheric processes. The MANTRA campaigns were conducted at Vanscoy, Saskatchewan, Canada (52° N, 107° W) in late August and early September of 1998, 2000, 2002 and 2004. During late summer at mid-latitudes, the stratosphere is close to photochemical control, providing an ideal scenario for the study reported here. From this analysis we find that: (1) reducing the value for the vertical diffusion coefficient in CMAM to a more physically reasonable value results in the model better reproducing the measured profiles of long-lived species; (2) the existence of compact correlations among the constituents, as expected from independent measurements in the literature and from models, confirms the self-consistency of the MANTRA measurements; and (3) the 1998 measurements show structures in the chemical species profiles that can be associated with transport, adding to the growing evidence that the summertime stratosphere can be much more disturbed than anticipated. The mechanisms responsible for such disturbances need to be understood in order to assess the representativeness of the measurements and to isolate long-term trends.

Arctic polar vortex variability in the Canadian middle atmosphere model

2001 ◽  
Vol 39 (4) ◽  
pp. 457-469 ◽  
Author(s):  
Jason D. Chaffey ◽  
John C. Fyfe
Keyword(s):  
Middle Atmosphere ◽  
Polar Vortex ◽  
Atmosphere Model

scholarly journals Ozone climatology using interactive chemistry: Results from the Canadian Middle Atmosphere Model

2000 ◽  
Vol 105 (D21) ◽  
pp. 26475-26491 ◽  
Author(s):  
J. de Grandpré ◽  
S. R. Beagley ◽  
V. I. Fomichev ◽  
E. Griffioen ◽  
J. C. McConnell ◽  
...  
Keyword(s):  
Middle Atmosphere ◽  
Atmosphere Model
Sign in / Sign up

Export Citation Format

Share Document