Current Magnitude and DirectionData Set (DS) | Office for Coastal Management (OCM)
GUID: gov.noaa.nmfs.inport:66127 | Updated: May 30, 2023 | Published / External
|Title:||Current Magnitude and Direction|
Monthly and annual U and V vectors were summarized for 14 unique depth levels from daily means using the HYCOM and NCODA Global 1/12-degree Reanalysis. The U vector (m/s) is to the East and the V vector (m/s) is to the North. Current magnitude (m/s) was calculated using the daily U and V vectors. Descriptive statistics of mean, variance, standard deviations, minimum, and maximum were calculated for each month from the twenty years of data using the daily means (1992-2012). Mean, variance, and standard deviation was calculated for the annual summary period (1992-2012). The mean direction in degrees (with 0 = North) was calculated from the summarized U and V vector means, and represents the direction that the current is moving toward. The 1/12-degree global HYCOM+NCODA Ocean Reanalysis was funded by the U.S. Navy and the Modeling and Simulation Coordination Office. Computer time was made available by the DoD High Performance Computing Modernization Program. The output is publicly available at http://hycom.org.
To support ocean planning activities pursuant to the Executive Order Regarding the Ocean Policy to Advance the Economic, Security, and Environmental Interests of the United States, the Energy Policy Act, the National Environmental Policy Act, the Rivers and Harbors Act, and the Coastal Zone Management Act.
Bureau Code: 006:48, Program Code: 006:055
|ISO 19115 Topic Category||
|ISO 19115 Topic Category||
|Global Change Master Directory (GCMD) Location Keywords||
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA
|None||Exclusive Economic Zone|
|None||Outer Continental Shelf|
|None||United States of America|
Data Set Information
|Data Set Scope Code:||Data Set|
|Maintenance Frequency:||As Needed|
|Data Presentation Form:||Map (digital)|
|Entity Attribute Overview:||
annualMean, annualStdDev, annualVarience, directionAnnualMean
|Data Set Credit:||U. S. Global Ocean Data Assimilation Experiment, National Ocean Partnership Program, NOAA National Centers for Coastal Ocean Science, NOAA Office for Coastal Management, Bureau of Ocean Energy Management|
Point of Contact
|Date Effective From:||2018-06|
|Date Effective To:|
|Contact (Organization):||NOAA Office for Coastal Management (NOAA/OCM)|
2234 South Hobson Ave
Charleston, SC 29405-2413
|Currentness Reference:||Publication Date|
Extent Group 1
Extent Group 1 / Geographic Area 1
|Data Use Constraints:||
For coastal and ocean planning
Microsoft Windows, ArcGIS Pro, Azure SQL
|Horizontal Positional Accuracy:||
Compiled to meet 10 meters horizontal accuracy at 95% confidence level
These data are logically consistent
HYCOM and NCODA Global 1/12° Reanalysis
|Contact Name:||U. S. Global Ocean Data Assimilation Experiment (GODAE), National Ocean Partnership Program (NOPP)|
|Extent Start Date/Time:||2018-08-01|
|Citation URL Name:||Source Online Linkage|
|Citation URL Description:||
URL where the source data were originally accessed.
HYCOM Current Speed and Direction
Process Step 1
(1) A daily snapshot (1200 hours data file) of the HYCOM + NCODA Global 1/12ÃÂ° Reanalysis data was downloaded from the HYCOM website in NetCDF format. The data range spanned from 10/2/1992 to 12/31/2012. Global temperature, salinity, u and v grids were extracted from the daily HYCOM NetCDF files for each of the available z-levels (depth).
A current magnitude grid was created for each u/v grid. Mean, minimum, maximum, variance and standard deviation grids were calculated for each variable-depth-month combination by combining all of the daily files for each variable-depth-month (e.g. temperature-40m-January). Mean, minimum, maximum, and standard deviation were also calculated by combining daily files across the entire time span (annual).
(2) Data were extracted from netCDF files and stored in CSV files for each variable, statistic, and depth level (38 depth levels)
(3) 14 unique depth levels were created as values were identical (2-125, 150-250, 300-350, 400-500, 600, 700, 800, 900-1000, 1250, 1500, 2000, 3000, 4000, 5000) and stored in a single CSV.
(4) CSVs for each statistic (mean, min, max, var, stdev) were combined into a single csv file for each month. (Therefore each variable has 12 monthly CSV and 1 annual CSV.) Note: for annual no min or max statistics were generated.
(5) All CSV files were exported as feature datasets.
(6) Direction in degrees was calculated from U and V mean vectors (not calculated for max, min, std, var). Direction is the direction the current is moving to.
(7) All CSV files were clipped by the U.S. Exclusive Economic Zone (EEZ).
(8) Any record with Null for all Depth levels was removed.
|Process Date/Time:||2018-08-01 00:00:00|
|Catalog Item ID:||66127|
|Metadata Record Created By:||Brianna Key|
|Metadata Record Created:||2021-12-22 03:15+0000|
|Metadata Record Last Modified By:||SysAdmin InPortAdmin|
|Metadata Record Last Modified:||2023-05-30 18:10+0000|
|Metadata Record Published:||2021-12-22|
|Metadata Publication Status:||Published Externally|
|Do Not Publish?:||N|
|Metadata Last Review Date:||2021-12-22|
|Metadata Review Frequency:||1 Year|
|Metadata Next Review Date:||2022-12-22|