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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

Apr 21, 2018 at 02:32 UTC 5 hours ago

Update Frequency

1 day

Product Type

Satellite

Feature Type

GRID

Spatial Reference System

WGS84

Temporal Resolution

6 hours