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Global Attributes:	Conventions: CDC Non-gridded title: 4x Daily Spectral Coefficients from the NMC Reanalysis for Vorticity on Multiple Levels history: created Oct 1997 by R.H. Schweitzer (NETcdF2.3) The precision is the number of places to the the right of the decimal point in the U and V winds calculated from these spectral coefficients that were unaffected by the data packing. FOR EACH LATITUDE (going from north pole to south pole). THE ASSOCIATED LEGENDRE FUNCTIONS ARE DEFINED: PBAR(M,N,THETA) = SQRT((2N+1)FACTORIAL(N-M)/(2FACTORIAL(N+M))) SIN(THETA)M/(2NFACTORIAL(N)) TIMES THE (N+M)TH DERIVATIVE OF (X2-1)N WITH RESPECT TO X=COS(THETA) note: theta = 0.5pi - phi, where phi is latitude and theta is colatitude. Therefore, cos(theta) = sin(phi) and sin(theta) = cos(phi). where n is degree (subscript), m is order (superscript), and theta is colatitude in radians. The functions are orthogonal polynomials on the surface of the sphere and are normalized so that the integral of (PBAR(n,m,theta)*2)sin(theta) on the interval theta=0 to theta=pi equals 1. NOTE THAT PBAR(0,0,THETA) = SQRT(2)/2 description: Data is from NMC initialized reanalysis platform: Model m_fastest: F storage_type: Spectral compression_used: T references: http://www.esrl.noaa.gov/psd/data/gridded/data.ncep.reanalysis.html Unlimited_Dimension: time

Variables:	level: Array of 32 bit Reals [level = 0..27] level: units: sigma_level long_name: Sigma positive: down actual_range: 0.0, 1.0 axis: Z
	mean: Array of 32 bit Reals [time = 0..1459][level2 = 0..55] time: level2: long_name: First Spectral Coefficients for Vorticity at Multiple Levels units: - missing_value: -9.96921E36
	add_offset: Grid time: level: long_name: Add offset of Spectral Coefficients for Vorticity units: - missing_value: -9.96921E36
	scale_factor: Grid time: level: long_name: Scale Factor of Spectral Coefficients for Vorticity units: - missing_value: -9.96921E36
	time: Array of 64 bit Reals [time = 0..1459] time: units: hours since 1-1-1 00:00:0.0 long_name: Time actual_range: 1.7216112E7, 1.7224866E7 delta_t: 0000-00-00 06:00:00 standard_name: time axis: T
	vort: Array of 16 bit Integers [time = 0..1459][level = 0..27][num_values = 0..4031] time: level: num_values: long_name: Spectral Coefficients for Vorticity on Mulitple Levels actual_range: -2.0872845E-5, 3.116524E-5 units: 1./s missing_value: 32767 precision: 1 trunc_count: 62 trunc_type: Triangular GRIB_id: 43 GRIB_name: RELV var_desc: Vorticity dataset: NMC Reanalysis level_desc: Multiple Levels statistic: Individual Obs parent_stat: Other

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DDS:

Dataset {
    Float32 level[level = 28];
    Float32 mean[time = 1460][level2 = 56];
    Grid {
     ARRAY:
        Float32 add_offset[time = 1460][level = 28];
     MAPS:
        Float64 time[time = 1460];
        Float32 level[level = 28];
    } add_offset;
    Grid {
     ARRAY:
        Float32 scale_factor[time = 1460][level = 28];
     MAPS:
        Float64 time[time = 1460];
        Float32 level[level = 28];
    } scale_factor;
    Float64 time[time = 1460];
    Int16 vort[time = 1460][level = 28][num_values = 4032];
} ncep1/spectral/vort.spec/vort.spec.1965.nc;

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