Parameterization of the 15 μm CO2 band cooling in the middle atmosphere (15–115 km)

Fomichev, V. I.; Kutepov, A. A.; Akmaev, R. A.; Shved, G. M.

doi:10.1016/0021-9169(93)90149-s

Cited by 86 publications

(80 citation statements)

References 12 publications

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“…2.8 rapidly degrades. The approach initially followed in CMAM was to employ a more accurate IR scheme (Fomichev et al, 1993;Fomichev and Blanchet, 1995) in the stratosphere and mesosphere with a region of transition between the two schemes occurring over the range 40-7 hPa. More recently, additional improvements to the radiation above this transition region include a new 15 µm CO 2 parameterization (Fomichev et al, 1998), near-infrared CO 2 solar heating with non-LTE effects included (Ogibalov and Fomichev, 2003;, water vapor IR cooling, non-unit efficiency for solar O 3 heating in the mesosphere, solar O 2 heating in the Schumann-Runge bands and continuum, the effect of sphericity, and chemical heating (in the CCM-MAM version).…”

Section: Dyn-mam Physicsmentioning

confidence: 99%

Technical Note: The CCCma third generation AGCM and its extension into the middle atmosphere

et al. 2008

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Abstract. The Canadian Centre for Climate Modelling and Analysis third generation atmospheric general circulation model (AGCM3) is described. The discussion summarizes the details of the complete physics package emphasizing the changes made relative to the second generation version of the model. AGCM3 is the underlying model for applications which include the IPCC fourth assessment, coupled atmosphere-ocean seasonal forecasting, the first generation of the CCCma earth system model (CanESM1), and middleatmosphere chemistry-climate modelling (CCM). Here we shall focus on issues related to an upwardly extended version of AGCM3, the Canadian Middle-Atmosphere Model (CMAM). The CCM version of CMAM participated in the 2006 WMO/UNEP Scientific Assessment of Ozone Depletion and issues concerning its climate such as the impact of gravity-wave drag, the modelling of a spontaneous QBO, and the seasonality of the breakdown of the Southern Hemisphere polar vortex are discussed here.

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Section: Dyn-mam Physicsmentioning

confidence: 99%

Technical Note: The CCCma third generation AGCM and its extension into the middle atmosphere

et al. 2008

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“…Solar heating rates are determined using the formalism of Strobel (1978) for O 2 and O 3 and the parametrization of Freidenreich and Ramaswamy (1993) for CO 2 and H 2 O. The CO 2 cooling rate including NLTE eects above 70 km is determined using the parametrization of Fomichev et al (1993), whilst for O 3 cooling rates the parametrization of Fomichev and Shved (1985) has been implemented. For water vapour the cooling-tospace approximation of Zhu (1994) is used.…”

Section: Radiationmentioning

confidence: 99%

Use of coupled ozone fields in a 3-D circulation model of the middle atmosphere

Reddmann¹,

Ruhnke²,

Kouker³

1999

Ann Geophysicae

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Abstract. With a detailed chemistry scheme for the middle atmosphere up to 70 km which has been added to the 3-D Karlsruhe simulation model of the middle atmosphere (KASIMA), the eects of coupling chemistry and dynamics through ozone are studied for the middle atmosphere. An uncoupled version using an ozone climatology for determining heating rates and a coupled version using on-line ozone are compared in a 10-month integration with meteorological analyses for the winter 1992/93 as the lower boundary condition. Both versions simulate the meteorological situation satisfactorily, but exhibit a too cold lower stratosphere. The on-line ozone diers from the climatological data between 20 and 40 km by exhibiting too high ozone values, whereas in the lower mesosphere the ozone values are too low. The coupled model version is stable and diers only above 40 km signi®cantly from the uncoupled version. Direct heating eects are identi®ed to cause most of the dierences. The well-known negative correlation between temperature and ozone is reproduced in the model. As a result, the coupled version slightly approaches the climatological ozone ®eld. Further feedback eects are studied by using the on-line ozone ®eld as a basis for an arti®cial climatology. For non-disturbed ozone conditions realistic monthly and zonally averaged ozone data are sucient to determine the heating rates for modelling the middle atmosphere.

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“…The absorption of solar extreme ultraviolet (EUV) radiation is calculated using absorption cross sections for O, O 2 , and N 2 by Torr et al (1979) and a revised version of the solar EUV¯ux model by Tobiska (1991). The infrared radiation transfer in the 9.6-lm O 3 and 15-lm CO 2 bands is treated according to Fomichev and Shved (1985) and Fomichev et al (1993), respectively. The coe cients of molecular viscosity and thermal conductivity are calculated according to Banks and Kockarts (1973, x14.3).…”

Section: Modelmentioning

confidence: 99%

SMLTM simulations of the diurnal tide: comparison with UARS observations

1997

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Abstract. Wind and temperature observations in the mesosphere and lower thermosphere (MLT) from the Upper Atmosphere Research Satellite (UARS) reveal strong seasonal variations of tides, a dominant component of the MLT dynamics. Simulations with the Spectral mesosphere/lower thermosphere model (SMLTM) for equinox and solstice conditions are presented and compared with the observations. The diurnal tide is generated by forcing speci®ed at the model lower boundary and by in situ absorption of solar radiation. The model incorporates realistic parameterizations of physical processes including various dissipation processes important for propagation of tidal waves in the MLT. A discrete multi-component gravity-wave parameterization has been modi®ed to account for seasonal variations of the background temperature. Eddy di usion is calculated depending on the gravitywave energy deposition rate and stability of the background¯ow. It is shown that seasonal variations of the diurnal-tide amplitudes are consistent with observed variations of gravity-wave sources in the lower atmosphere.

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Parameterization of the 15 μm CO2 band cooling in the middle atmosphere (15–115 km)

Cited by 86 publications

References 12 publications

Technical Note: The CCCma third generation AGCM and its extension into the middle atmosphere

Technical Note: The CCCma third generation AGCM and its extension into the middle atmosphere

Use of coupled ozone fields in a 3-D circulation model of the middle atmosphere

SMLTM simulations of the diurnal tide: comparison with UARS observations

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