TY - JOUR

T1 - Parametrization of momentum and energy depositions from gravity waves generated by tropospheric hydrodynamic sources

AU - Gavrilov, N. M.

N1 - Funding Information: Acknowledgements. This study was supported by the Russian Foundation for Basic Research and International Association for the promotion of cooperation with scientists from the New Independent States (INTAS).

PY - 1997/12

Y1 - 1997/12

N2 - The mechanism of generation of internal gravity waves (IGW) by mesoscale turbulence in the troposphere is considered. The equations that describe the generation of waves by hydrodynamic sources of momentum, heat and mass are derived. Calculations of amplitudes, wave energy fluxes, turbulent viscosities, and accelerations of the mean flow caused by IGWs generated in the troposphere are made. A comparison of different mechanisms of turbulence production in the atmosphere by IGWs shows that the nonlinear destruction of a primary IGW into a spectrum of secondary waves may provide additional dissipation of nonsaturated stable waves. The mean wind increases both the effectiveness of generation and dissipation of IGWs propagating in the direction of the wind. Competition of both effects may lead to the dominance of IGWs propagating upstream at long distances from tropospheric wave sources, and to the formation of eastward wave accelerations in summer and westward accelerations in winter near the mesopause.

AB - The mechanism of generation of internal gravity waves (IGW) by mesoscale turbulence in the troposphere is considered. The equations that describe the generation of waves by hydrodynamic sources of momentum, heat and mass are derived. Calculations of amplitudes, wave energy fluxes, turbulent viscosities, and accelerations of the mean flow caused by IGWs generated in the troposphere are made. A comparison of different mechanisms of turbulence production in the atmosphere by IGWs shows that the nonlinear destruction of a primary IGW into a spectrum of secondary waves may provide additional dissipation of nonsaturated stable waves. The mean wind increases both the effectiveness of generation and dissipation of IGWs propagating in the direction of the wind. Competition of both effects may lead to the dominance of IGWs propagating upstream at long distances from tropospheric wave sources, and to the formation of eastward wave accelerations in summer and westward accelerations in winter near the mesopause.

UR - http://www.scopus.com/inward/record.url?scp=0642373143&partnerID=8YFLogxK

U2 - 10.1007/s00585-997-1570-4

DO - 10.1007/s00585-997-1570-4

M3 - Article

AN - SCOPUS:0642373143

VL - 15

SP - 1570

EP - 1580

JO - Annales Geophysicae

JF - Annales Geophysicae

SN - 0992-7689

IS - 12

ER -