Advanced search
1 file | 738.13 KB

Generalization and application of the flux-conservative thermodynamic equations in the AROME model of the ALADIN system

(2016) GEOSCIENTIFIC MODEL DEVELOPMENT. 9(6). p.2129-2142
Author
Organization
Abstract
General yet compact equations are presented to express the thermodynamic impact of physical parameterizations in a NWP or climate model. By expressing the equations in a flux-conservative formulation, the conservation of mass and energy by the physics parameterizations is a built-in feature of the system. Moreover, the centralization of all thermodynamic calculations guarantees a consistent thermodynamical treatment of the different processes. The generality of this physics-dynamics interface is illustrated by applying it in the AROME NWP model. The physics-dynamics interface of this model currently makes some approximations, which typically consist of neglecting some terms in the total energy budget, such as the transport of heat by falling precipitation, or the effect of diffusive moisture transport. Although these terms are usually quite small, omitting them from the energy budget breaks the constraint of energy conservation. The presented set of equations provides the opportunity to get rid of these approximations, in order to arrive at a consistent and energy-conservative model. A verification in an operational setting shows that the impact on monthly-averaged, domain-wide meteorological scores is quite neutral. However, under specific circumstances, the supposedly small terms may turn out not to be entirely negligible. A detailed study of a case with heavy precipitation shows that the heat transport by precipitation contributes to the formation of a region of relatively cold air near the surface, the so-called cold pool. Given the importance of this cold pool mechanism in the life cycle of convective events, it is advisable not to neglect phenomena that may enhance it.
Keywords
COMPRESSIBLE NONHYDROSTATIC MODEL, ENTROPY POTENTIAL TEMPERATURE, DYNAMICAL CORE, HYDROSTATIC-PRESSURE, MOIST ATMOSPHERE, NUMERICAL-MODELS, AIR, PRECIPITATION, SIMULATION, PARAMETERIZATIONS

Downloads

  • gmd-9-2129-2016.pdf
    • full text
    • |
    • open access
    • |
    • PDF
    • |
    • 738.13 KB

Citation

Please use this url to cite or link to this publication:

Chicago
Degrauwe, Daan, Yann Seity, François Bouyssel, and Piet Termonia. 2016. “Generalization and Application of the Flux-conservative Thermodynamic Equations in the AROME Model of the ALADIN System.” Geoscientific Model Development 9 (6): 2129–2142.
APA
Degrauwe, D., Seity, Y., Bouyssel, F., & Termonia, P. (2016). Generalization and application of the flux-conservative thermodynamic equations in the AROME model of the ALADIN system. GEOSCIENTIFIC MODEL DEVELOPMENT, 9(6), 2129–2142.
Vancouver
1.
Degrauwe D, Seity Y, Bouyssel F, Termonia P. Generalization and application of the flux-conservative thermodynamic equations in the AROME model of the ALADIN system. GEOSCIENTIFIC MODEL DEVELOPMENT. 2016;9(6):2129–42.
MLA
Degrauwe, Daan, Yann Seity, François Bouyssel, et al. “Generalization and Application of the Flux-conservative Thermodynamic Equations in the AROME Model of the ALADIN System.” GEOSCIENTIFIC MODEL DEVELOPMENT 9.6 (2016): 2129–2142. Print.
@article{8511183,
  abstract     = {General yet compact equations are presented to express the thermodynamic impact of physical parameterizations in a NWP or climate model. By expressing the equations in a flux-conservative formulation, the conservation of mass and energy by the physics parameterizations is a built-in feature of the system. Moreover, the centralization of all thermodynamic calculations guarantees a consistent thermodynamical treatment of the different processes. The generality of this physics-dynamics interface is illustrated by applying it in the AROME NWP model. The physics-dynamics interface of this model currently makes some approximations, which typically consist of neglecting some terms in the total energy budget, such as the transport of heat by falling precipitation, or the effect of diffusive moisture transport. Although these terms are usually quite small, omitting them from the energy budget breaks the constraint of energy conservation. The presented set of equations provides the opportunity to get rid of these approximations, in order to arrive at a consistent and energy-conservative model. A verification in an operational setting shows that the impact on monthly-averaged, domain-wide meteorological scores is quite neutral. However, under specific circumstances, the supposedly small terms may turn out not to be entirely negligible. A detailed study of a case with heavy precipitation shows that the heat transport by precipitation contributes to the formation of a region of relatively cold air near the surface, the so-called cold pool. Given the importance of this cold pool mechanism in the life cycle of convective events, it is advisable not to neglect phenomena that may enhance it.},
  author       = {Degrauwe, Daan and Seity, Yann and Bouyssel, Fran\c{c}ois and Termonia, Piet},
  issn         = {1991-959X},
  journal      = {GEOSCIENTIFIC MODEL DEVELOPMENT},
  language     = {eng},
  number       = {6},
  pages        = {2129--2142},
  title        = {Generalization and application of the flux-conservative thermodynamic equations in the AROME model of the ALADIN system},
  url          = {http://dx.doi.org/10.5194/gmd-9-2129-2016},
  volume       = {9},
  year         = {2016},
}

Altmetric
View in Altmetric
Web of Science
Times cited: