A simple method of including longwave radiation in a tropospheric numerical prediction model
Danard, Maurice B.
MetadataShow full item record
A simple method of compqting longwave radiative cooling in the troposphere associated with water vapor is described. The procedure may readily be incorporated into a tropospheric numerical prediction model. Radiation from ozone and carbon dioxide is not considered. However, influences of arbitrary vertical distributions of cloud and moisture are included. Average annual cooling rates along a meridional cross section are calculated for a cloudless atmosphere. The results agree fairly well with the total radiative cooling (longwave and shortwave) as given by Manabe and Miller except in the lower troposphere at low latitudes. Here shortwave absorption by water vapor is appreciable. The three-dimensional distribution of longwave radiative cooling is also computed in a case of a developing cyclone for comparison with that of release of latent heat. The largest cooling occurs at cloud top and can be a significant fraction of the amount of energy released as latcnt heat in the upper troposphere. Computations also show that in this case study the longwave cooling tends to reduce the available potential energy, especially in the upper troposphere. Synoptic-scale precipitation amounts resulting from destabilization of clouds by longwave cooling are computed. These range up to 1.4 mm in 12 hr. This destabilizing effect may be important in explaining the nocturnal maximum of precipitation over the sea. It may also contribute significantly to cyclone development.
RightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
Showing items related by title, author, creator and subject.
Danard, Maurice B. (Monterey, California. Naval Postgraduate School, 1968-01); NPS-51DD8011AA simple method of computing long-wave radiative cooling in the troposphere associated with water vapor is described. Radiation from ozone and carbon dioxide is not considered. However, Influences of arbitrary vertical ...
Danard, Maurice B. (Monterey, California. Naval Postgraduate School, 1968-06); AFCRL-68-0252Calculations with a synoptic case study show that long-wave radiative cooling tends to reduce the available potential energy, especially in the upper troposphere. Synoptic-scale precipitation amounts resulting from ...
A study of the development of extratropical cyclones with an analytic model. Part II: Sensitivity to tropospheric structure and analysis of height tendency dynamics Hirschberg, Paul A.; Fritsch, J. Michael (1994);An analytic quasigeostrophic model is used to examine the sensitivity of type B cyclogenesis to the vertical structure of the troposphere given a particular stratospheric temperature configuration. It is found that there ...