PRODUCT USER MANUAL For Arctic Ocean Wave Analysis and Forecasting Products
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PRODUCT USER MANUAL
For Arctic Ocean Wave Analysis and Forecasting
Products
ARCTIC_ANALYSIS_FORECAST_WAV_002_010
Issue: 1.2
Contributors: Øyvind Saetra, Arild Burud, Ana Carrasco, M. Müller
CMEMS version scope : Version 4.0
Approval Date by the CMEMS products team: 12 March 2018PUM for product Ref: CMEMS-ARC-PUM-
WAVE_002_010
ARCTIC_ANALYSIS_FORECAST_WAV Date : 8 Feb. 2018
Issue : 1.2
CHANGE RECORD
Issue Date § Description of Change Author Validated By
1.0 1. Dec 2016 All Creation of the document Øyvind Saetra, Arild Burud, L. Bertino
Ana Carrasco
1.1 17 Mar All Modified after technical review Ana Carrasco L. Bertino
2017
1.2 8. Feb. Update to new wave V4 product Malte Müller L. Bertino
2018
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Issue : 1.2
TABLE OF CONTENTS
I INTRODUCTION Erreur ! Signet non défini.
I.1 Summary Erreur ! Signet non défini.
II DESCRIPTION OF THE PRODUCT SPECIFICATION Erreur ! Signet non défini.
II.1 General Information (Real-time product) Erreur ! Signet non défini.
II.2 Details of datasets (Real Time product) Erreur ! Signet non défini.
II.3 Production System Description Erreur ! Signet non défini.
II.3.1 ARCTIC_ANALYSIS_FORECAST_WAVE Erreur ! Signet non défini.
II.4 Update Time Erreur ! Signet non défini.
II.5 Time coverage Erreur ! Signet non défini.
II.6 Time averaging Erreur ! Signet non défini.
III HOW TO DOWNLOAD A PRODUCT Erreur ! Signet non défini.
IV files NOMENCLATURE and format Erreur ! Signet non défini.
IV.1 Nomenclature of files when downloaded through the CMEMS Web Portal Subsetter Service Erreur !
Signet non défini.
IV.2 Nomenclature of files when downloaded through the CMEMS Web Portal DirectGetFile or CMEMS
FTP Service Erreur ! Signet non défini.
IV.3 . File Format : NetCDF Erreur ! Signet non défini.
IV.4 File size Erreur ! Signet non défini.
IV.5 Other information : mean centre of Products, land mask value, missing value Erreur ! Signet non
défini.
IV.6 Reading Software Erreur ! Signet non défini.
IV.7 Structure and semantic of netCDF maps files Erreur ! Signet non défini.
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GLOSSARY AND ABBREVIATIONS
MFC Monitoring and Forecasting Centre
ARC_MFC Arctic Monitoring and Forecasting Centre
NetCDF Network Common Data Form
ECMWF European Centre for Medium-Range Weather Forecasts
MET The Norwegian Meteorological Institute
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I INTRODUCTION
I.1 Summary
This guide describes the data product files from the Arctic Monitoring and Forecasting Centre, what
data services are available to access them, and how to use the files and services.
ARCTIC_ANALYSIS_FORECAST_WAV_002_010 is the analysis and forecast products of the Arctic
Monitoring and Forecast Center for ocean waves. The system delivers daily forecast of ocean wave
data for 5 days ahead. Output from the system is hourly data of significant wave height, wave period
and direction (for a list of the full set of parameters see Table 2 below).
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II DESCRIPTION OF THE PRODUCT SPECIFICATION
II.1 General Information (Real-time product)
Product Lines ARCTIC_ANALYSIS_FORECAST_WAV
Geographical coverage North of 65°N
Variables Full list of variable is listed in Table 2 below
Analysis From 2016-12-09 ; ongoing
Forecast 5 day forecasts
Temporal resolution hourly instantaneous surface fields
Target delivery time Daily before 14:00 UTC
Delivery mechanism CMEMS Information System: DirectGetFile, Subsetter, MFTP and WMS
Horizontal resolution 6.25 km (output)
Format Netcdf4
Table 1: ARC-MFC Real Time products
II.2 Details of datasets (Real Time product)
ARCTIC_ANALYSIS_FORECAST_WAV
ARCTIC_ANALYSIS_FORECAST_WAV_002_010
dat contains all the variables.
aset
- VHM0 [m]
my Spectral significant wave height (Hm0
wav sea_surface_wave_significant_height
e- VTM10 [s]
arc- Spectral moments (-1,0) wave period (Tm-10)
my
oce
sea_surface_wave_mean_period_from_variance_spectral_density_inverse_frequency_moment
an- VTM02 [s]
be Spectral moments (0,2) wave period (Tm02)
sea_surface_wave_mean_period_from_variance_spectral_density_second_frequency_moment
VTPK [s]
Wave period at spectral peak / peak period (Tp)
sea_surface_wave_period_at_variance_spectral_density_maximum
VMDR [degree]
Mean wave direction from (Mdir)
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sea_surface_wave_from_direction
VPED [degree]
Wave principal direction at spectral peak
sea_surface_wave_from_direction_at_spectral_peak
VSDX [m s-1]
Stokes drift U
sea_surface_wave_stokes_drift_x_velocity
VSDY [m s-1]
Stokes drift V
sea_surface_wave_stokes_drift_y_velocity
VHM0_WW [m]
Spectral significant wind wave height
sea_surface_wind_wave_significant_height
VTM01_WW [s]
Spectral moments (0,1) wind wave period
sea_surface_wind_wave_mean_period
VMDR_WW [degree]
Mean wind wave direction from
sea_surface_wind_wave_from_direction
VHM0_SW1 [m]
Spectral significant primary swell wave height
sea_surface_primary_swell_wave_significant_height
VTM01_SW1 [s]
Spectral moments (0,1) primary swell wave period
sea_surface_primary_swell_wave_mean_period
VMDR_SW1 [degree]
Mean primary swell wave direction from
sea_surface_primary_swell_wave_from_direction
VHM0_SW2 [m]
Spectral significant secondary swell wave height
sea_surface_secondary_swell_wave_significant_height
VTM01_SW2 [s]
Spectral moments (0,1) secondary swell wave period
sea_surface_secondary_swell_wave_mean_period
VMDR_SW2 [degree]
Mean secondary swell wave direction from
sea_surface_secondary_swell_wave_from_direction
Table 2: List of variables in datasets and their names and units in the NetCDF output files for the
ARCTIC_ANALYSIS_FORECAST_WAVE_002_010
II.3 Production System Description
II.3.1 ARCTIC_ANALYSIS_FORECAST_WAV
The ARCTIC_ANALYSIS_FORECAST_WAV_002_010 is a wave forecast system run at the
Norwegian Meteorological Institute (MET) and the core model is based on an upgraded version the
European wave model WAM (see link for documentation under subsection 3.1.1: The Model). It runs
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once daily producing 5-days forecasts for an area covering the Nordic Seas and the Arctic Ocean. The
model is forced by wave spectra from the European Centre for Medium-Range Weather Forecasts
(ECMWF) at the lateral boundaries, with surface (10-metre) winds, also from ECMWF, at the surface
and with ice concentration from EUMETSAT OSI SAF. The model implementation includes a data
assimilation scheme for satellite altimeter data. This is currently not in use due to the lack of altimeter
data north of 65 N. Plans for the next version is to include data assimilation once Sentile-3 altimeter
data becomes available.
.
.
Domain All products are calculated in a rotated spherical grid with 8km horizontal
resolution. As a post processing these are interpolated to a polar stereographic
Resolution and grid of 6.25km horizontal resolution as shown in Figure 1.The data are delivered
grid
to the users through the CMEMS system in the same grid as used for delivering
data from the Arctic MFC ocean circulation model.
Geographic Polar stereographic grid
coverage
Figure 1 Example of forecast of significant wave height..
Bathymetry
Vertical grid surface
The horizontal resolution is 8 km and the spectral resolution is 36x36 (directions x
Spectral grid
frequencies).
Model Version The wave model WAM solves the equations for the conservation of spectral wave
energy in the presence of dissipation, wind input and non-linear interaction between
spectral wave nodes. The original version was developed by a group of European
scientists in the 1980's and was the first third-generation wave model, which does
not parametrize the non-linear interaction, but computes this term by a numerical
approximation to the exact formulation. The current model version is an upgrade
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made in the FP7 project MyWave. Documentation for this version of WAM is given
in:
http://met.no/Forskning/Publikasjoner/MyWave/filestore/MyWave_Report_D1.1.pdf
Assimilation Data assimilation is currently not in use due to the lack of altimeter data north of 65°
scheme N. Plans for the next version is to include data assimilation once Sentinel-3
altimeter data becomes available.
Assimilated Ø
observations
Initial conditions
six-hourly analysed U10 wind fields from ECMWF
Forcing and
lateral boundary wave spectra from ECMWF
conditions
Observations The forecasts are contentiously monitored and verified against available buoy and
platform observations within the domain. The observations available in Near-Real
Time (NRT) MET are all operated by the offshore industry and provided in-kind to
the MFC. These consist observing techniques from wave riders to radar and sonar
technologies. These are used to produce analysis and forecast scores that are
issued in quarterly reports.
Table 3: System Description
II.4 Update Time
ARCTIC_ANALYSIS_FORECAST_WAV_002_010 products:
The daily forecast is available before 14:00 UTC.
II.5 Time coverage
Model data is available starting from 2016-12-09 and ongoing, up to the latest 5 day forecast.
When using the Subsetter and DirectGetFile interface, user will get the “best estimate” for each day.
II.6 Time averaging
The fields are 1-hourly instantaneous
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III HOW TO DOWNLOAD A PRODUCT
To download products from the Copernicus Marine Environment Monitoring Service (CMEMS) you
first need to register as a user. How to register (FAQ1) and the process and download products
(FAQ3) is described in detail at:
http://marine.copernicus.eu/services-portfolio/technical-faq/#1
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IV FILES NOMENCLATURE AND FORMAT
The nomenclature of the downloaded files differs on the basis of the chosen download mechanism
Subsetter or Directgetfile or MFTP service.
IV.1 Nomenclature of files when downloaded through the CMEMS Web Portal Subsetter
Service
Files nomenclature when downloaded through the CMEMS Web Portal Subsetter is based on product
dataset name and a numerical reference related to the request number in the MIS-GW (MET-GW).
The scheme is: datasetname_nnnnnn.nc
where :
datasetname is a character string with the following :
● dataset-mywave-arctic-be
nnnnnn: 6 digit integer corresponding to the unique request number in the MET-GW.
.nc: standard NetCDF filename extension.
Example:
dataset-mywave-arctic -be_435283.nc
IV.2 Nomenclature of files when downloaded through the CMEMS Web Portal
DirectGetFile or CMEMS FTP Service
Files nomenclature when downloaded through the CMEMS Web Portal DirectGetFile is based on
product dataset name and a numerical reference related to the request number in the MIS-GW (MET-
GW).
The scheme is: datasetname_nnnnnn.zip
where :
datasetname is a character string with the following :
• dataset-mywave-arctic-be
nnnnnn: 6 digit integer corresponding to the unique request number in the MET-GW.
.zip: standard ZIP filename extension.
Example:
dataset-mywave-arctic -be_435284.zip
The downloaded ZIP file will contain files named in the following scheme:
[VDATE]_MyWaveWam8_b[BDATE].nc
where
[BDATE]: YYYYMMDD is the bulletin date
[VDATE]: YYYYMMDD is the forecast valid date
When downloading through the CMEMS MFTP service, users may select files individually, where
filenames are [VDATE]_MyWaveWam8_b[BDATE].nc as described above.
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Example: 20170108_MyWaveWam8_b20170104.nc is the file containing the
hourly values for 2017-01-08 00:00-23:00 UTC, coming from the bulletin of
2017-01-04.IV.3 . File Format : NetCDF
The products are stored using the NetCDF format.
NetCDF (network Common Data Form) is an interface for array-oriented data access and a library that
provides an implementation of the interface. The netCDF library also defines a machine-independent
format for representing scientific data. Together, the interface, library, and format support the creation,
access, and sharing of scientific data. The netCDF software was developed at the Unidata Program
Center in Boulder, Colorado. The netCDF libraries define a machine-independent format for
representing scientific data.
Please see Unidata netCDF pages (http://www.unidata.ucar.edu/software/netcdf/) for more
information, and to retrieve netCDF software package.
NetCDF data format is:
* Self-Describing. A netCDF file includes information about the data it contains.
* Architecture-independent. A netCDF file is represented in a form that can be accessed by
computers with different ways of storing integers, characters, and floating-point numbers.
* Direct-access. A small subset of a large dataset may be accessed efficiently, without first reading
through all the preceding data.
* Appendable. Data can be appended to a netCDF dataset along one dimension without copying
the dataset or redefining its structure. The structure of a netCDF dataset can be changed, though this
sometimes causes the dataset to be copied.
* Sharable. One writer and multiple readers may simultaneously access the same netCDF file.
The products are compliant with the NetCDF Climate and Forecast Convention CF-1.4 (see http://cf-
pcmdi.llnl.gov/).
IV.4 File size
DATASET NAME NAME OF FILE DIMENSION [MB]
Compressed Uncompresse
d
5 files with name:
[VDATE]_MyWaveWam8_b[BDATE].
dataset-mywave- nc, 5 * 117M 5 * 117M*
arc-myocean-be
Where VDATE and BDATE are explained in
section IV.2
*: The size of NetCDF4 files does not change with compression.
IV.5 Other information: mean centre of Products, land mask value, missing
value
ARCTIC_ANALYSIS_FORECAST_WAV_002_010 data are fields of hourly instantaneous values
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Fill values / missing values: -999.f, for all variables. This value is also used where there is land or ice
cover.
An extra ice mask variable ICE_MASK is available to make it possible to identify the ice coverage, it
contains the value 0.f for open water, 1.f for ice covered water or -999.f (“Fillvalue”) for land cover.
IV.6 Reading Software
NetCDF data can be browsed and used through a number of software packages, including:
✓ ncBrowse: http://www.epic.noaa.gov/java/ncBrowse/,
✓ NetCDF Operator (NCO): http://nco.sourceforge.net/
✓ IDL, Matlab, Panoply, GMT…
IV.7 Structure and semantic of netCDF maps files
For ARCTIC_ANALYSIS_FORECAST_WAV_002_010 product:
The model output files contain some additional fields in addition to the variables mentioned earlier. An
example output NetCDF file header is inserted below, with the additional fields in italic fonts.
netcdf \20180217_MyWaveWam8r625_b20180207 {
dimensions:
time = UNLIMITED ; // (1 currently)
rlat = 1761 ;
rlon = 1217 ;
variables:
float ICE_MASK(time, rlat, rlon) ;
ICE_MASK:_FillValue = -999.f ;
ICE_MASK:long_name = "0 = water, 1=ice" ;
ICE_MASK:metno_name = "ICE_MASK" ;
ICE_MASK:units = "1" ;
ICE_MASK:coordinates = "lon lat" ;
ICE_MASK:grid_mapping = "projection_stere" ;
float VHM0(time, rlat, rlon) ;
VHM0:_FillValue = -999.f ;
VHM0:long_name = "Spectral significant wave height (Hm0)" ;
VHM0:standard_name = "sea_surface_wave_significant_height" ;
VHM0:units = "m" ;
VHM0:coordinates = "lon lat" ;
VHM0:grid_mapping = "projection_stere" ;
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float VHM0_SW1(time, rlat, rlon) ;
VHM0_SW1:_FillValue = -999.f ;
VHM0_SW1:long_name = "Spectral significant primary swell wave height" ;
VHM0_SW1:standard_name = "sea_surface_primary_swell_wave_significant_height"
;
VHM0_SW1:units = "m" ;
VHM0_SW1:coordinates = "lon lat" ;
VHM0_SW1:grid_mapping = "projection_stere" ;
float VHM0_SW2(time, rlat, rlon) ;
VHM0_SW2:_FillValue = -999.f ;
VHM0_SW2:long_name = "Spectral significant secondary swell wave height" ;
VHM0_SW2:standard_name =
"sea_surface_secondary_swell_wave_significant_height" ;
VHM0_SW2:units = "m" ;
VHM0_SW2:coordinates = "lon lat" ;
VHM0_SW2:grid_mapping = "projection_stere" ;
float VHM0_WW(time, rlat, rlon) ;
VHM0_WW:_FillValue = -999.f ;
VHM0_WW:long_name = "Spectral significant wind wave height" ;
VHM0_WW:standard_name = "sea_surface_wind_wave_significant_height" ;
VHM0_WW:units = "m" ;
VHM0_WW:coordinates = "lon lat" ;
VHM0_WW:grid_mapping = "projection_stere" ;
float VMDR(time, rlat, rlon) ;
VMDR:_FillValue = -999.f ;
VMDR:long_name = "Mean wave direction from (Mdir)" ;
VMDR:standard_name = "sea_surface_wave_from_direction" ;
VMDR:units = "degree" ;
VMDR:coordinates = "lon lat" ;
VMDR:grid_mapping = "projection_stere" ;
float VMDR_SW1(time, rlat, rlon) ;
VMDR_SW1:_FillValue = -999.f ;
VMDR_SW1:long_name = "Mean primary swell wave direction from" ;
VMDR_SW1:standard_name = "sea_surface_primary_swell_wave_from_direction" ;
VMDR_SW1:units = "degree" ;
VMDR_SW1:coordinates = "lon lat" ;
VMDR_SW1:grid_mapping = "projection_stere" ;
float VMDR_SW2(time, rlat, rlon) ;
VMDR_SW2:_FillValue = -999.f ;
VMDR_SW2:long_name = "Mean secondary swell wave direction from" ;
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VMDR_SW2:standard_name = "sea_surface_secondary_swell_wave_from_direction"
;
VMDR_SW2:units = "degree" ;
VMDR_SW2:coordinates = "lon lat" ;
VMDR_SW2:grid_mapping = "projection_stere" ;
float VMDR_WW(time, rlat, rlon) ;
VMDR_WW:_FillValue = -999.f ;
VMDR_WW:long_name = "Mean wind wave direction from" ;
VMDR_WW:standard_name = "sea_surface_wind_wave_from_direction" ;
VMDR_WW:units = "degree" ;
VMDR_WW:coordinates = "lon lat" ;
VMDR_WW:grid_mapping = "projection_stere" ;
float VPED(time, rlat, rlon) ;
VPED:_FillValue = -999.f ;
VPED:long_name = "Wave principal direction at spectral peak" ;
VPED:standard_name = "sea_surface_wave_from_direction_at_spectral_peak" ;
VPED:units = "degree" ;
VPED:coordinates = "lon lat" ;
VPED:grid_mapping = "projection_stere" ;
float VSDX(time, rlat, rlon) ;
VSDX:_FillValue = -999.f ;
VSDX:long_name = "Stokes drift U" ;
VSDX:standard_name = "sea_surface_wave_stokes_drift_x_velocity" ;
VSDX:units = "m/s" ;
VSDX:coordinates = "lon lat" ;
VSDX:grid_mapping = "projection_stere" ;
float VSDY(time, rlat, rlon) ;
VSDY:_FillValue = -999.f ;
VSDY:long_name = "Stokes drift V" ;
VSDY:standard_name = "sea_surface_wave_stokes_drift_y_velocity" ;
VSDY:units = "m/s" ;
VSDY:coordinates = "lon lat" ;
VSDY:grid_mapping = "projection_stere" ;
float VTM01_SW1(time, rlat, rlon) ;
VTM01_SW1:_FillValue = -999.f ;
VTM01_SW1:long_name = "Spectral moments (0,1) primary swell wave period" ;
VTM01_SW1:standard_name = "sea_surface_primary_swell_wave_mean_period" ;
VTM01_SW1:units = "s" ;
VTM01_SW1:coordinates = "lon lat" ;
VTM01_SW1:grid_mapping = "projection_stere" ;
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float VTM01_SW2(time, rlat, rlon) ;
VTM01_SW2:_FillValue = -999.f ;
VTM01_SW2:long_name = "Spectral moments (0,1) secondary swell wave period" ;
VTM01_SW2:standard_name = "sea_surface_secondary_swell_wave_mean_period"
;
VTM01_SW2:units = "s" ;
VTM01_SW2:coordinates = "lon lat" ;
VTM01_SW2:grid_mapping = "projection_stere" ;
float VTM01_WW(time, rlat, rlon) ;
VTM01_WW:_FillValue = -999.f ;
VTM01_WW:long_name = "Spectral moments (0,1) wind wave period" ;
VTM01_WW:standard_name = "sea_surface_wind_wave_mean_period" ;
VTM01_WW:units = "s" ;
VTM01_WW:coordinates = "lon lat" ;
VTM01_WW:grid_mapping = "projection_stere" ;
float VTM02(time, rlat, rlon) ;
VTM02:_FillValue = -999.f ;
VTM02:long_name = "Spectral moments (0,2) wave period (Tm02)" ;
VTM02:standard_name =
"sea_surface_wave_mean_period_from_variance_spectral_density_second_frequency_moment" ;
VTM02:units = "s" ;
VTM02:coordinates = "lon lat" ;
VTM02:grid_mapping = "projection_stere" ;
float VTM10(time, rlat, rlon) ;
VTM10:_FillValue = -999.f ;
VTM10:long_name = "Spectral moments (-1,0) wave period (Tm-10)" ;
VTM10:standard_name =
"sea_surface_wave_mean_period_from_variance_spectral_density_inverse_frequency_moment" ;
VTM10:units = "s" ;
VTM10:coordinates = "lon lat" ;
VTM10:grid_mapping = "projection_stere" ;
float VTPK(time, rlat, rlon) ;
VTPK:_FillValue = -999.f ;
VTPK:long_name = "Wave period at spectral peak / peak period (Tp)" ;
VTPK:standard_name =
"sea_surface_wave_period_at_variance_spectral_density_maximum" ;
VTPK:units = "s" ;
VTPK:coordinates = "lon lat" ;
VTPK:grid_mapping = "projection_stere" ;
double forecast_reference_time ;
forecast_reference_time:standard_name = "forecast_reference_time" ;
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forecast_reference_time:units = "days since 1970-01-01 00:00:00 +00:00" ;
double lat(rlat, rlon) ;
lat:units = "degree_north" ;
lat:long_name = "latitude" ;
lat:standard_name = "latitude" ;
double lon(rlat, rlon) ;
lon:units = "degree_east" ;
lon:long_name = "longitude" ;
lon:standard_name = "longitude" ;
float model_depth(rlat, rlon) ;
model_depth:_FillValue = -999.f ;
model_depth:long_name = "water depth" ;
model_depth:standard_name = "sea_floor_depth_below_sea_level" ;
model_depth:units = "m" ;
model_depth:coordinates = "lon lat" ;
model_depth:grid_mapping = "projection_stere" ;
int projection_stere ;
projection_stere:grid_mapping_name = "polar_stereographic" ;
projection_stere:scale_factor_at_projection_origin = 1. ;
projection_stere:straight_vertical_longitude_from_pole = -45. ;
projection_stere:latitude_of_projection_origin = 90. ;
projection_stere:earth_radius = 6371000. ;
projection_stere:proj4 = "+proj=stere +lon_0=-45 +lat_0=90 +k=1 +R=6371000
+no_defs" ;
double rlat(rlat) ;
rlat:axis = "Y" ;
rlat:standard_name = "projection_y_coordinate" ;
rlat:units = "m" ;
double rlon(rlon) ;
rlon:axis = "X" ;
rlon:standard_name = "projection_x_coordinate" ;
rlon:units = "m" ;
double time(time) ;
time:axis = "T" ;
time:standard_name = "time" ;
time:calendar = "gregorian" ;
time:delta_t = "0000-00-00 (01:00:00)" ;
time:units = "seconds since 1970-01-01 00:00:00" ;
time:dt_sec = 3600 ;
© EU Copernicus Marine Service – Public Page 19/ 20PUM for product Ref: CMEMS-ARC-PUM-
WAVE_002_010
ARCTIC_ANALYSIS_FORECAST_WAV Date : 8 Feb. 2018
Issue : 1.2
// global attributes:
:title = "ARCTIC_ANALYSIS_FORECAST_WAVE_002_006" ;
:institution = "Norwegian Meteorological Institute" ;
:source = "WAM wave model modified version cycle 4.5.4" ;
:comment = "Original grid rotated" ;
:history = "Wed Feb 7 10:14:24 2018: ncks -A -v forecast_reference_time
W8km_force.nc MyWave_wam8_WAVE06.nc\nSat Feb 13 17:23:37 2016: ncatted -a ,global,d,,
TRUEcoordDepthA8.nc" ;
:NCO = "4.0.8" ;
:Conventions = "CF-1.6" ;
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