NOAA Waves terms compiled by Richard Bouchard Luis Bermudez MMI Richard Bouchard Waves glossary of NOAA with synonyms of NDBC, MEDS and others More information: 2005-08-01T08:40:09 Richard Bouchard's Excel file v. July 28th 2005 Sea State Parameter Alternate or Shorthand From Sea State Parameter Definition Definition Source Synonym-User Use AMS Glossary of Meteorology Sea State Sea State A description of the properties of sea surface waves at a given time and place. CO22 ( MEDS uses subscript 2 for North-South Slope. ) C33 CO-Spectra(C33) CO-Spectra(C33) MEDS NODC F291 Unsigned Co-spectra of North-South Slope NDBC C33 CO33 Estimate ( MEDS uses subscript 3 for East-West slope ) C22 NODC F291 CO-Spectra(C22) NDBC Unsigned Co-spectra of East-West Slope MEDS CO-Spectra(C22) C22 MEDS Q12 QD13 Estimate Quad-Spectra(Q12) Quadrature Spectral Density of heave and E-W Slope. Q12 NODC F291 Q12 NDBC FM-65 WAVOB Code Maximum Likelihood Method ( WMO ) "WMO Manual On Codes, International Codes, WMO No. 306, Volum I.1, Part A, FM-65-XI WAVEOB, Table 1744" Maximum Likelihood Method Method of Calculation of Spectral Data Im "Mean Wave Direction ( NDBC, NODC F291 )" Proposed Dp ( CDIP ) MWD ( NDBC ) "FM-65 WAVOB Code, encoded to 4 degree resolution" The mean wave direction at the Dominant Wave Period Dominant Wave Direction Mean Direction ( CDIP ) dddd ( WMO ) Dominant Wave Direction "FM-65 WAVOB Code, encoded to 4 degree resolution" Principal Wave Direction ALPHA2 The principal wave direction from which waves are coming computed from the Longuet-Higgins Fourier Coefficients [for a specific frequency] da2da2 ( WMO ) "WMO Manual On Codes, International Codes, WMO No. 306, Volum I.1, Part A, FM-65-XI WAVEOB" Principal Wave Direction ALPHA2 ( NDBC ) CO23 Unsigned Co-Spectra of North-South and East-West Slopes. C23 C23 CO-Sprectra(C23) CO-Sprectra(C23) MEDS NDBC NODC F291 r2r2 ( WMO ) Second Normalized Polar Coordinates Derived from Fourier Coefficients FM-65 WAVOB Code "WMO Manual On Codes, International Codes, WMO No. 306, Volum I.1, Part A, FM-65-XI WAVEOB" Second Normalized Polar Coordinates Derived from Fourier Coefficients First Normalized Polar Coordinates Derived from Fourier Coefficients [for a specific frequency] R2 ( NDBC ) R2 Sampling Interval SSSS "WMO Manual On Codes, International Codes, WMO No. 306, Volum I.1, Part A, FM-65-XI WAVEOB" Sampling Interval Inverse of the Sampling Rate Directional Spread of the Dominant Wave dsds "WMO Manual On Codes, International Codes, WMO No. 306, Volum I.1, Part A, FM-65-XI WAVEOB" Directional Spread of the Dominant Wave MEDS Q13 NDBC QD12 Estimate Q13 Q13 Quadrature Spectral Density of heave and N-S slope Q13 NODC F291 Spectral Peak Period Tp "Inverse of the Spectral Peak Frequency, i.e., frequency at which the Variance-Spectral Density is a maximum." Peak Spectral Period ( CDIP ) DPD ( NDBC ) Spectral Peak Period Peak Period ( MEDS ) Tp ( CDIP ) "Dominant Wave Period ( NDBC, NODC F291 )" "IAHR List of Sea State Parameters, 1987" Duration of Record of Waves CDIP "WMO Manual On Codes, International Codes, WMO No. 306, Volum I.1, Part A, FM-65-XI WAVEOB" Sample Length (Wave) Averaging Period Record Length NDBC Duration of Record of Waves Duration of Wave Acquisition D'D'D'D' Ta ( CDIP ) "APD, AVP ( NDBC )" Average Wave Period ( CDIP ) "Average Wave Period ( NDBC, NODC F291 )" Average Wave Period "IAHR List of Sea State Parameters, 1987" Average Wave Period T02 Tz ( NDBC ) "Defined by Spectral Moments, m0/m1" T01 "Defined by Spectral Moments, sqrt(m0/m2)" C12 NODC F291 C12 CO-Spectra (C12) NDBC Unsigned Co-spectra of heave and E-W slope CO-Spectra (C12) First Normalized Polar Coordinates Derived from Fourier Coefficients R1 FM-65 WAVOB Code R1 ( NDBC ) r1r1 ( WMO ) First Normalized Polar Coordinates Derived from Fourier Coefficients First Normalized Polar Coordinates Derived from Fourier Coefficients [for a specific frequency] "WMO Manual On Codes, International Codes, WMO No. 306, Volum I.1, Part A, FM-65-XI WAVEOB" "FM-65 WAVOB Code, encoded to 4 degree resolution" Mean Wave Direction ALPHA1 ( NDBC ) The mean wave direction from which waves are coming computed from the Longuet-Higgins Fourier Coefficients [for a specific frequency] da1da1 ( WMO ) ALPHA1 Mean Wave Direction "WMO Manual On Codes, International Codes, WMO No. 306, Volum I.1, Part A, FM-65-XI WAVEOB" Spectrally derived wave height ( CDIP ) Hm0 The average of the highest 1/3 waves estimated by 4*sqrt(m0) "Signifcant Wave Height ( NDBC, NODC F291, MEDS )" WVHT ( NDBC ) Signficant Wave Height HO ( NDBC ) Hm0 ( CDIP ) "IAHR List of Sea State Parameters, 1987" Signficant Wave Height Longuet-Higgins(1964) Longuet-Higgins(1964) ( WMO ) FM-65 WAVOB Code "WMO Manual On Codes, International Codes, WMO No. 306, Volum I.1, Part A, FM-65-XI WAVEOB, Table 1744" Method of Calculation of Spectral Data Im ( WMO ) FM-65 WAVOB Code Method of Calculation of Spectral Data Longuet-Higgins(F3 method) "WMO Manual On Codes, International Codes, WMO No. 306, Volum I.1, Part A, FM-65-XI WAVEOB, Table 1744" Longuet-Higgins(F3 method) Im Spectral Density Variance-Spectral Density "IAHR List of Sea State Parameters, 1987" Spectral Wave Density ( NDBC ) "Spectral Density ( NDBC, NODC F291, MEDS )" Variance-Spectral Density Energy ( CDIP ) Energy ( NDBC ) Wave Energy ( CDIP ) Spectral representation of wave data NODC F291 CO-Spectra(C13) C13 CO-Spectra(C13) C13 NDBC Unsigned Co-spectra of heave and N-S slope Sample Rate (Wave Sampling) Frequency "CDIP, NDBC" Sample Rate NDBC "The sampling rate, in hertz, of the sample time series used to measure the waves." ( WMO ) Im "WMO Manual On Codes, International Codes, WMO No. 306, Volum I.1, Part A, FM-65-XI WAVEOB, Table 1744" Maximum Entropy Method FM-65 WAVOB Code Method of Calculation of Spectral Data Maximum Entropy Method