Slayt 1 - RTC, Regional Training Centre - Turkey

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5- SPECTRAL MODELHow Data are RepresentedSpectral models represent the spatial variationsof meteorological variables (such asgeopotential heights) as a finite series of wavesof differing wavelengths.In the introduction, we considered thestructure of a conceptual two-wave model.Let's now look at a real data set.Consider the example of a hemispheric 500-hPaheight field in the top portion of the graphic. Ifthe height data are tabulated at 40°N latitudeevery 10 degrees of longitude (represented ateach yellow dot on the chart), there are 36points around the globe. It takes a minimum offive to seven points to reasonably represent awave and, in this case, five or six waves can bedefined with the data. The locations of thewave troughs are shown in the top part as solidred lines.When the data are plotted in the graph, the fivewave troughs are definable by the blue dots butare unequally spaced. This indicates thepresence of more than one wavelength ofsmall-scale variations. In this case, the shorterwaves represent the synoptic-scale features,while the longer waves represent planetaryfeatures.
Use of Grid Point Methods in Spectral ModelsSpectral models use a combination of computational techniques, both spectraland grid point. Parts of the forecast equations use information about the forecastvariables and their derivatives obtained entirely from the wave representation.Examples of these linear components include the important pressure gradientand Coriolis forces. Horizontal gradients are precisely calculated from the waverepresentation, avoiding errors associated with finite differencing.
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ATMOSPHERIC MODELINGNUMERICAL WEATH
Page 3 and 4:
MTO477Brief History of Meteorology
Page 5:
Excerpts from Aristotle’sMeteorol
Page 72:
The Forces of a Parcel of Air
Page 84 and 85:
Atmospheric Model Aerosol processes
Page 86 and 87:
Highlights 1955 - First Operational
Page 88 and 89:
Highlights 1996 - AVN/MRF changed t
Page 90 and 91: Highlights2001 (November) - Major c
Page 92 and 93: Equivalent-Barotropic Atmosphere Co
Page 94 and 95: Thermal Wind (Remember?)The thermal
Page 96 and 97: Written in general form:tAiA i = de
Page 98 and 99: Example of a diagnostic equation:Co
Page 100 and 101: NUMERICAL WEATHER PREDICTIONLECTURE
Page 102 and 103: Model ComponentsForecast:This repre
Page 104 and 105: Model ComponentsDynamics:In NWP, dy
Page 106 and 107: Parameterized Processes and Paramet
Page 108 and 109: Parameterizing Sub Grid-Scale Proce
Page 110 and 111: Accounting for the Effects of Physi
Page 112 and 113: Outlook As computer power increases
Page 114 and 115: DiscussionThe correct choices are (
Page 116 and 117: 1- NWP EquationsIn NWP, future valu
Page 118 and 119: 2-The Primitive Equations
Page 120 and 121: Horizontal advection of west-to-eas
Page 122 and 123: Additional Information: Coriolis Fo
Page 124 and 125: Additional Information: Coriolis Fo
Page 126 and 127: Temperature Forecast EquationTime c
Page 128 and 129: Hydrostatic or Vertical MomentumEqu
Page 130 and 131: Physical ProcessesAll of the foreca
Page 132 and 133: How Models Solve the ForecastEquati
Page 134 and 135: Representing the Forecast Variables
Page 136 and 137: 3-Grid Point: Data RepresentationGr
Page 138 and 139: 4-Grid Point ModelsIn the real atmo
Page 142 and 143: Use of Grid Point Methods in Spectr
Page 144 and 145: Impacts of Grid Point Physics Calcu
Page 146 and 147: 7- Hydrostatic Models Most grid poi
Page 148 and 149: Non-Hydrostatic Models In addition,
Page 151 and 152: HYDROSTATIC MODELS Characteristics
Page 153 and 154: References Carr, F.H., 1988: Introd
Page 155 and 156: The dependent variables in this set
Page 157 and 158: Problems in finding suitable latera
Page 159 and 160: Conditions whichOnemakeBIGthe primi
Page 161 and 162: Courant-Friederichs-Lewy criteria C
Page 163 and 164: Setting up a Numerical Model Grid p
Page 165 and 166: Horizontal resolution Horizontal re
Page 167 and 168: Sigma Coordinate System (σ)p• De
Page 169 and 170: Convective ParameterizationSchemes
Page 171: «Computations indicate that a perf
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