SOWM Hindcast Wind and Wave Climatology for North Pacific, North Atlantic, and Mediterranean (DSI-9786)Entry ID: gov.noaa.ncdc.C00007
Abstract: SOWM Hindcast Wind and Wave Climatology for North Pacific, North Atlantic and Mediterranean is historical digital data set DSI-9786, archived at the National Climatic Data Center (NCDC). It is a digital ocean atlas. SOWM is the Spectral Ocean Wave Model, a computer software methodology which was developed by Dr. Willard J. Pierson and others and adopted in December 1974 by what was then the US ... Navy Fleet Numerical Oceanography Center (FLENUMOCEANCEN). FLENUMOCEANCEN was a predecessor of the current Fleet Numerical Meteorology and Oceanography Center (FNMOC). SOWM is a computer-based procedure that produces a directional variance spectrum at specified grid points that are a maximum of 180 nautical miles apart. This spectrum defines the sea surface at each grid point through a two dimensional matrix (direction/ frequency) of 12 directions and 15 frequency bands. The David Taylor Naval Ship Research and Development Center (DTNSRDC), a predecessor to the US Naval Surface Warfare Center, Carderock Division (NSWCCD), with Operations Research, Inc. (ORI), developed computer programs to derive a number of numerical parameters from the SOWM spectral wave data. The NCDC used many of the concepts from these programs and others written by FLENUMOCEANCEN to devise a parameterization program that was used for this atlas (DSI-9786). This atlas contains climatological summaries for seven parameters: wind speed and direction, wave height, wave direction, wave slope code, modal wave period, and wave directionality. The first four parameters had appeared in US Navy climatologies. The latter three parameters had not appeared, because they cannot be directly derived from visual observations. However, they can be very important operating considerations. Ship rolling and stability is affected by the wave slope of higher waves. Wave slope of a regular wave is defined as the ratio of wave height to wave length. The modal wave period is the period associated with the maximum wave energy in the wave spectrum. Modal wave periods associated with wavelengths of about 0.75 and 1.25 ship lengths (depending on ship course and speed) can cause resonance pitching and heaving. The modal wave is not necessarily equal to the wave period associated with the higher of the two waves, the sea or the swell as summarized in past US Navy climatologies (US Navy, 1974). Wave directionality is the uniformity of the direction of movement of the waves. If the waves are all moving in a uniform direction, then the directionality is one. When there is no preferred direction of wave movement (a completely confused sea state), the directionality is zero. Obviously, ship response and maneuverability can be affected by the directional spread of the wave energy. Data in this atlas are derived using winds and waves from the period January 1973 to December 1982, i.e. 10 years.
Purpose: To make a wide range of climatic data available to researchers and the public.
SUPPLEMENTAL INFORMATION: data set
CURRENTNESS REFERENCE: Ground Condition
Data Set Citation
Dataset Originator/Creator: National Climatic Data Center, NESDIS, NOAA, U.S. Department of Commerce
Dataset Title: SOWM Hindcast Wind and Wave Climatology for North Pacific, North Atlantic, and Mediterranean (DSI-9786)
Dataset Release Date: Unknown
Data Presentation Form: atlasOnline Resource: http://www.ncdc.noaa.gov
Start Date: 1973-01-01Stop Date: 1982-12-31
OCEANS > OCEAN WAVES > SEA STATE
OCEANS > OCEAN WAVES > SIGNIFICANT WAVE HEIGHT
OCEANS > OCEAN WAVES > SWELLS
OCEANS > OCEAN WAVES > WAVE FREQUENCY
OCEANS > OCEAN WAVES > WAVE HEIGHT
OCEANS > OCEAN WAVES > WAVE LENGTH
OCEANS > OCEAN WAVES > WAVE PERIOD
OCEANS > OCEAN WAVES > WAVE SPECTRA
OCEANS > OCEAN WAVES > WAVE SPEED/DIRECTION
OCEANS > OCEAN WAVES > WIND WAVES
OCEANS > OCEAN WINDS > SURFACE WINDS
OCEANS > SEA SURFACE TOPOGRAPHY > SEA SURFACE SLOPE
OCEANS > SEA SURFACE TOPOGRAPHY > SEA SURFACE HEIGHT
Quality ATTRIBUTE ACCURACY REPORT: Not provided
LOGICAL CONSISTENCY REPORT: Unknown
COMPLETENESS REPORT: Completeness information not available.
PROCESS DESCRIPTION: Not derived from another source.
PROCESS DATE: Unknown
Access Constraints ACCESS CONSTRAINTS: None
DISTRIBUTION LIABILITY: Every effort has been made to ensure that these data are accurate and reliable within the limits of current NOAA quality control procedures. NOAA can only certify that the data provided to its customers is an authentic copy of the records which were accepted for inclusion in NOAA archives. NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.
Use Constraints None
Data Set Progress
Role: DIF AUTHOR
Email: ncdc.orders at noaa.gov
151 Patton Avenue, Room 120
Province or State: NC
Postal Code: 28801-5001
Creation and Review Dates
DIF Creation Date: 2006-06-29
Last DIF Revision Date: 2011-07-21