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CCMP Wind Vector Analysis Product V2.0

Remote Sensing Systems

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SUMMARY

Publisher
Remote Sensing Systems
Source
Reanalysis
Abstract
The Cross-Calibrated Multi-Platform (CCMP) gridded surface vector winds are produced using satellite, moored buoy, and model wind data, and as such, are considered to be a Level-3 ocean vector wind analysis product. The V2 CCMP processing combines Version-7 RSS radiometer wind speeds, QuikSCAT and ASCAT scatterometer wind vectors, moored buoy wind data, and ERA-Interim model wind fields using a Variational Analysis Method (VAM) to produce four maps daily of 0.25 degree gridded vector winds.

The Variational Analysis Method (VAM) of data assimilation was utilized by Atlas et al. [1996, 2011] to find the most dynamically suitable way to combine satellite observations and in situ wind measurements into gap-free wind fields. The VAM combines Remote Sensing Systems (RSS) instrument data with moored buoy measurements and a starting estimate (first-guess) of the wind field. The European Center for Medium-Range Weather Forecasts (ECMWF) ERA-Interim Reanalysis winds are used in the CCMP V2.0 processing as the first-guess wind field. All wind observations (satellite and buoy) and model analysis fields are referenced to a height of 10 meters.

The VAM generates a gridded surface wind analysis which minimizes an objective function measuring the misfit of the analysis to the background, the data and certain a priori constraints. The CCMP wind analyses are at temporal and spatial resolutions suitable for scientific study. [More...]
Refreshed
Jun 16, 2018 at 09:23 UTC 1 year, 4 days ago
Update Frequency
6 months
Product Type
Reanalysis
Feature Type
GRID
Spatial Reference System
WGS84
Temporal Resolution
6 hour
Spatial Resolution
0.25 degree

EXTENT

Vertical
10 meters
Start Date
Jul 10, 1987 at 00:00 UTC
End Date
Dec 30, 2017 at 18:00 UTC

DISTRIBUTION

Distribution Format(s)
NetCDF4
Online Resource(s)
http://www.remss.com/measurements/ccmp

VARIABLES (3)

Vocabulary (version) CF 28.0
Variable
Long name
Unit
API Query
nobs
number of observations used to derive wind vector components
count

JSON

CSV

uwnd
u-wind vector component at 10 meters
m s-1

JSON

CSV

vwnd
v-wind vector component at 10 meters
m s-1

JSON

CSV

DIMENSIONS (3)

Vocabulary (version) CF 28.0
Dimension
Long name
Unit
longitude
Longitude in degrees east
degrees_east
time
Time of analysis
hours since 1987-01-01 00:00:00
latitude
Latitude in degrees north
degrees_north

LICENSE

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