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Global Ocean Wind L4 Near Real Time 6 Hourly Observations V5

Copernicus Marine Environment Monitoring System (CMEMS)

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SUMMARY

Publisher
Copernicus Marine Environment Monitoring System (CMEMS)
Source
Satellite
Abstract
The global ocean near-real-time 6-hourly L4 wind product provides high-resolution spatial and temporal gridded wind fields over the global oceans using both ASCAT and OSCAT retrievals as observations.

Metop-A and OceanSat2 satellites are in quasi sun-synchronous orbits. The local equator crossing times at the ascending nodes are 9:30 a.m ±30mn and 12 midnight ±30mn for Metop and OceanSat2, respectively. The associated orbit repeat cycles are 29 days and 2 days.

The method is an extension of the method previously used to estimate daily wind fields from wind observations retrieved only from one scatterometer (ASCAT or QuikSCAT). The details of the method are provided in Bentamy et al (2011).

All satellite swath data occurring within 3 hours from 6-hourly ECMWF wind epochs are selected. ASCAT and OSCAT occurring between 9 hours and 3 hours before and after ECMWF analysis time are temporally interpolated at the epoch date ±3hours. The resulting blended wind fields are estimated over global ocean with the spatial resolution in both longitude and latitude of 0.25 degrees and the temporal resolution of 6 hours.

The resulting L4 wind products involve the following parameters: wind speed, zonal and meridional components, wind stress amplitude and the associated zonal and meridional components. Wind speed and component errors, derived from the objective method, and the sampling length of observations used for blended wind estimations are provided.

Wind stress values are estimated using COARE 3 model (Fairall et al, 2003). The required sea surface temperature, air temperature, and specific humidity are derived from ECMWF analyses.

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Refreshed
Dec 18, 2019 at 08:31 UTC 2 years ago
Update Frequency
1 day
Product Type
Satellite
Feature Type
GRID
Spatial Reference System
WGS84
Temporal Resolution
6 hours
Spatial Resolution
0.25 degree

EXTENT

Vertical
Sea Surface
Start Date
Nov 12, 2019 at 12:00 UTC
End Date
Dec 16, 2019 at 06:00 UTC

DISTRIBUTION

Distribution Format(s)
NetCDF4
Online Resource(s)
http://marine.copernicus.eu/services-portfolio/access-to-products/?option=com_csw&view=details&product_id=WIND_GLO_WIND_L4_NRT_OBSERVATIONS_012_004

VARIABLES (15)

Vocabulary (version) CF 28.0
Variable
Long name
Unit
API Query
surface_type
flag - 0:ocean - 1:earth/ice
1

JSON

CSV

northward_wind
northward wind speed
m s-1

JSON

CSV

wind_stress_divergence
wind stress divergence
N m-3

JSON

CSV

wind_speed_rms
wind speed root mean square
m s-1

JSON

CSV

wind_stress_curl
wind stress curl
N m-3

JSON

CSV

eastward_wind
eastward wind speed
m s-1

JSON

CSV

wind_vector_divergence
wind vector divergence
s-1

JSON

CSV

wind_vector_curl
wind vector curl
s-1

JSON

CSV

eastward_wind_rms
eastward wind speed root mean square
m s-1

JSON

CSV

surface_downward_northward_stress
northward wind stress
Pa

JSON

CSV

northward_wind_rms
northward wind speed root mean square
m s-1

JSON

CSV

sampling_length
sampling length
1

JSON

CSV

wind_speed
wind speed
m s-1

JSON

CSV

wind_stress
wind stress
Pa

JSON

CSV

surface_downward_eastward_stress
eastward wind stress
Pa

JSON

CSV

More...

DIMENSIONS (3)

Vocabulary (version) CF 28.0
Dimension
Long name
Unit
lat
latitude
degrees_north
time
time
hours since 1900-01-01 00:00:00
lon
longitude
degrees_east

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