Mesoscale Wind Database

Table of Contents

Overview

With this tool you can perform initial estimation of the local wind flow, in order to start designing a preliminary offshore wind farm layout.

Here some existing databases of meteorological data were adopted to provide fast and convenient access to them.

Databases included here:

  1. FNL/GFS
  2. MERRA

These databases were processed in the following way to be used here:

  • identified the points of interest to limit the database to the areas where the OFFWIND project is useful, i.e. areas on the planet where off-shore wind farms can feasibly be implemented;
  • extraction of data to these locations;
  • processing of the extracted data to arrive at manageable condensed statistics.

FNL/GFS

FNL/GFS database provides meteorological data on a 1º resolution grid. Thus the selection of points was also restricted to this grid.

As such, 7023 points of interest were identified based on two criteria:

  • sea depth below 200m (3512 points, blue dots in the figure);
  • proximity to the coast below 1º (3493 points, red points in the figure).

The database contains planetary snapshots of the atmosphere as predicted by the GFS model, at 4 times per day (at 0000, 0600, 1200, 1800), since September 1999. Some data assimilation exists, but it is an analysis dataset, not a reanalysis.

Once all points of interest were identified, FNL/GFS wind data was extracted at each point, for the period 2000-2011. That is, a 12-year time series with wind data at every 6 hours. Extracted data consists of wind velocities and direction at 1000 millibar pressure. In a standard atmosphere, this corresponds to 111m above sea level, though the actual height will vary during the time series.

The time series produced by the extraction utility (7523 series, one per point of interest, 840KB each) are converted into TAB format (frequency domain) which contain, in a tabular form, wind direction frequency, mean wind speeds and velocity histograms.

FNL database coverage. Click to open in separate window.

MERRA

While FNL has a 1º resolution both in latitude and longitude, MERRA has 0.5º in latitude and 2/3º in longitude.

TAB files for all the MERRA points are at depths lower than 200m and distances to coast below 1 degree.

Usage Tips

On database page you can work with points in databases. View, search and import them by using map or Search dialog.

Clusters

Due to some technical restrictions, all points are not shown at once (doing that will severely load your browser). Instead, these points are grouped into clusters. Cluster shows a number of points it contains and it's size and density visually changes depending on current map scaling.

119
- this is an example of cluster that has 119 points grouped in it.

Points

Points - are the basic units that database contain. It directly corresponds to a physical location on earth defined by coordinates - Latitude and Longitude.

- this is an example of point.

Reference

TAB format summary (PDF, 126KB)