tr_tppn: precipitation flux
tr_lw_toa: toa outgoing longwave flux
tr_om500: omega
tr_tppn_spct: precipitation flux S-T power spectrum
tr_lw_toa_spct: toa outgoing longwave flux S-T power spectrum
tr_om500_spct: omega S-T power spectrum
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tr_u250: eastward wind
tr_v250: northward wind
tr_mslp: air pressure at sea level
tr_u250_spct: eastward wind S-T power spectrum
tr_v250_spct: northward wind S-T power spectrum
tr_mslp_spct: air pressure at sea level S-T power spectrum