Atmospheric Kinetic Energy Spectra from Global High-Resolution Nonhydrostatic Simulations

摘要: Kinetic energy (KE) spectra derived from global high-resolution atmospheric simulations the Model forPredictionAcrossScales(MPAS)arepresented.Thesimulationsareproducedusingquasi-uniformglobal Voronoi horizontal meshes with 3-, 7.5-, and 15-km mean cell spacings. KE MPAS compare well observations other in literature possess canonical structure including a very-well-resolved shallow-sloped mesoscale region 3-km simulation. There is peak vertical velocity variance at model filter scale for all simulations, indicating underresolved nature of updrafts even mesh. The reveal that configuration produces an effective resolution (filter scale) approximately 6Dx. Comparison published highlight filtering issues, specifically insufficient can lead to spectral blocking production erroneous tails spectra. regions are produced without use kinetic backscatter, contrast results reported literature.No substantive difference found computed on constant height or pressure surfaces. Stratified turbulence not resolved used this study; hence, do support recent conjecture stratified explains portion spectrum.