ERA5(T) Rectangular Grid

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Revision as of 12:16, 8 January 2020 by Morten (talk | contribs) (Morten moved page ERA5 CDS Grid Data to ERA5 (Geographic Grid): Renaming of dataset - release of ERA5T on CDS grid)
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Winds @ 100m

Introduction

The initial ERA5 windPRO dataset released in 2017 is based on the raw ERA5 data on a reduced gaussian grid. Unfortuantely the newly released ERA5T (updated with a shorter delay) data is not available on the reduced gaussian grid, but only on the 0.25x0.25 grid available in the Climate Data Store. In order to have a dataset in windPRO with ERA5T data this ERA5 CDS Grid dataset is made available.

Resolution and Coverage

Resolution:
The dataset grid is an interpolated regular lat/lon grid at 0.25x0.25 resolution (around 27.8 km). It holds hourly values. Coverage is global for land-areas and coastal regions. In windPRO, offshore coverage is expected to cover an area of approximately 300 km from the coastline.

Update plan

The dataset holds data back to 1999 and will be updated with new data twice a month with a one week delay. The first update will be around the 8th of a month where all data from the previous month will be available. The second update will be around the 23rd of a month where the first half of the month will be available.
Once the final ERA5 data becomes available (after 2-3 months) the dataset will be updated with that data. According to ECMWF they do not expect changes to happen very often and in the event that it does happen it will be communicated to users. At EMD we will communicate any such changes to the windPRO users as well.

Data Parameters

EMD extracts a focused subset of climate-parameters from the ERA5 datasets - this subset focuses on wind-energy modelling. When the data have been processed at EMD, then the following parameters are available from within the online-data services within windPRO.

Table: Overview of the windPRO subset of ERA5 parameters.
Parameter Unit Description
time UTC time stamp
wSpeed.10 m/s Wind speed @ 10m
wDir.10 deg Wind direction @ 10m
wSpeed.100 m/s Wind speed @ 100m
wDir.100 deg Wind direction @ 100m
temperature.2 deg.celcius Temperature @ 2m
dewPointTemp.2 deg.celcius Dew point temperature @ 2m
rh.2 % Relative humidity @ 2m
psfc pa Surface pressure
msl pa Mean sea-level pressure
blh m Boundary layer height
tcc % Total cloud cover
heatFlux w/m2 Instantaneous surface sensible heat flux
zust m/s Friction velocity
cbh m Cloud base height
ssrdAcc w/m2 Surface solar radiation downwards
era5t 0/1 Binary variable indicating whether the sample is ERA5T data

External Links

Acknowledgements and Credits

  • ERA5 is being developed through the Copernicus Climate Change Service (C3S).
  • Data processing and distribution for ERA5 is carried out by ECMWF.