EMD-WRF South Korea - ERA5

EMD-WRF South Korea (ERA5) Domain

Introduction

The EMD-WRF South Korea (ERA5) dataset is our most accurate, high-resolution mesoscale dataset covering South Korea and minor parts of Japan and North Korea. This mesoscale dataset is derived from ERA-5 reanalysis data from ECMWF (http://www.ecmwf.int) as its boundary conditions. As a premium dataset, a ‘EMD-WRF South Korea (ERA5)’ subscription gives you instant access to 45000+ continuously updated onshore and offshore mesoscale time series. The domain area is shown in the figure to the right.

Direct access to time series via windPRO’s user friendly Online Data Service - i.e. no delivery time!

The WRF mesoscale model is run in an optimized configuration at a high spatial resolution of 3km to produce hourly time series. Spatial visualization of the full domain is included via windprospecting.com - and typically accessed from within windPRO.

At release time, the timespan of the data is at least 20 years back from today. Data access is via windPRO’s user friendly interface to on-line data and requires payment of an annual subscription fee. The EMD-WRF South Korea (ERA5) dataset is the successor of the EMD-WRF South Korea (ERA-Interim).

ERA5(T) and ERA5 as forcing data in the EMD-WRF South Korea (ERA5) dataset
During early December 2019, ECMWF released the ERA5(T) dataset. ERA5(T) is preliminary ERA5 data, but updated with a shorter five calender day delay. From summer 2022, ECMWF did make the ERA5(T) data available for the native, reduced Gaussian grid. This is a major improvement over the previous release schedule (before summer 2022), where the ERA5 Gaussian grid data came with a 2-3 month delay/lag due to ECMWF releases. Read more about ERA5 and ERA5T on our ERA5(T) Rectangular Grid dataset-page. EMD-WRF South Korea (ERA5) now uses both ERA5 (final) and ERA5(T) data, see more on the update schedule below.

Dataset Overview

• Content:: High-resolution and our most accurate mesoscale dataset covering a South Korean domain.
  127 different parameters with focus on renewable energy applications.
• Spatial Resolution: 3km
  
• Temporal Resolution: Hourly.
• Coverage: See image to the right.
  
• Period: 20+ years - the EMD databases holds data from 1999 until present day.
  
• Update schedule:
  • Currently, EMD is updating this dataset once a month. Updates to this mesoscale dataset is available around the 11th of the month, where all data from the previous month will be available. The actual date may vary, as it depends on the availability of the forcing data (ERA5 from ECMWF) and high-performance computing time.
  • Once the final ERA5 data becomes available (after 2-3 months) a check will be made if the final data (ERA5) released by ECMWF differs from the preliminary data (ERA5T). If so, the data will be updated but 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.

More on Release Schedule and Availability

Data is updated monthly with approximately 3 weeks delay defined by ERA-5's availability (from ECMWF), download time from the Copernicus Climate Datastore (from EU-Storage Servers) and computational efforts regarding EMD's high-performance computer clusters (from EMD). Before contacting support because of delays in the release schedule, please check ERA-5's availability on the ERA5 availability page (see link below). 'EMD-WRF South Korea (ERA5)' data cannot be computed at EMD HPC before ERA-5 data is available and have been downloaded to our storage system.

Validation

The below table shows the correlation statistcs (R2) for the 'New' EMD-WRF South Korea based on ERA5 using 14 masts in the South Korea domain. Notice the significant improvement in R2 compared to the 'Old' ERA-Interim based EMD-WRF and the raw ERA5 data.

Validation against 14 masts.

Dataset Parameters

A total of 127 sensors (parameters) are ready available for in-depth analysis directly in windPRO. The different parameters in the EMD-WRF South Korea (ERA5) dataset that are available from within windPRO are shown in the table below.

Table: Overview of EMD-WRF South Korea (ERA5) Dataset Parameters (3 km grid).

Parameter	Unit	Description	Type
time		UTC time stamp
wSpeed.x	m/s	Wind speeds at different heights above ground (x). Heights (x): 10,25,50,75,100,150,200,300,400,500,750,1000,4000m	Instantaneous
wDir.x	deg	Wind directions at different heights above ground (x). Heights (x): 10,25,50,75,100,150,200,300,400,500,750,1000,4000m	Instantaneous
sqrtTKE.x	m/s	Wind speed given as standard deviation in m/s. Derived from the turbulent kinetic energy (TKE) at different heights above ground (x). Heights (x): 10,25,50,75,100,150,200,300,400,500,750,1000,4000m	Instantaneous
press.x	Pa	Pressure at different heights above ground (x). Heights (x): 10,25,50,75,100,150,200,300,400,500,750,1000,4000m	Instantaneous
temp.x	celcius	Temperature at different heights above ground (x). Heights (x): 10,25,50,75,100,150,200,300,400,500,750,1000,4000m	Instantaneous
rh.x	%	Relative humidity at different heights above ground (x). Heights (x): 10,25,50,75,100,150,200,300,400,500,750,1000,4000m	Instantaneous
cloudWater.x	mg/kg	Cloud water content at different heights above ground (x). Heights (x): 10,25,50,75,100,150,200,300,400,500,750,1000,4000m	Instantaneous
cloudIce.x	mg/kg	Cloud icing content at different heights above ground (x). Heights (x): 10,25,50,75,100,150,200,300,400,500,750,1000,4000m	Instantaneous
psfc	Pa	Pressure at site	Instantaneous
msl	Pa	Pressure at mean sea level	Instantaneous
wSpeed.850hpa	m/s	Wind speeds at pressure level 850hPa.	Instantaneous
wDir.850hpa	deg	Wind speeds at pressure levels 850hPa.	Instantaneous
temperature.2	celcius	Temperatures at 2m	Instantaneous
waterTemp	celcius	Water temperature	Instantaneous
soilTemp.0-10cm	celcius	The temperature in the upper 10 cm of the soil	Instantaneous
relHumidity.2	%	Relative humidity in height 2m above ground level	Instantaneous
snowDepth	m	Snow depth (if present)	Instantaneous
vis.s	m	Visibility at surface	Instantaneous
sensHeatFlux.s	w/m2	Sensible Heat Flux at surface	Instantaneous
totPrecip.s	kg/m^2	Total Precipitation at surface	1h Accumulated
downShortWaveFlux.s	w/m2	Downward shortwave irradiance at surface	1h Average
swdDir.s	w/m2	Direct shortwave irradiance at surface	1h Average
swdDif.s	w/m2	Diffuse shortwave irradiance at surface	1h Average
cloudBottom	m	Height of cloud bottom	Instantaneous
cloudTop	m	Height of cloud top	Instantaneous
totalCloudCover.a	%	Total cloud cover in atmosphere	1h Average
convCloudCover.a	%	Convective cloud cover in atmosphere	1h Average
rmol	1/m	Inverse Monin-Obukhov-Length
znt	m	Rougnhess length	Instantaneous
u*	m/s	U-start (friction velocity)	Instantaneous
pblh	m	Height of the PBL boundary layer	Instantaneous

Required Modules/Licenses

To access the EMD-WRF South Korea (ERA5) mesoscale data the following licenses/modules are required in your windPRO setup:

• Basis
• METEO
• EMD-WRF South Korea (ERA5)

When the license fee is paid, you then have access to the full dataset without further cost. The price is available from the price-list on the EMD-homepage. Downloading of data is unrestricted for licenced users, however, a "fair use" policy applies. Unlicenced users may download three months of data from any point, however, multiple downloads are not allowed from the same point.

Visit EMD online ordering to purchase the needed licences.

Acknowledgement

• Model development and integration of this dataset into EMD services - was co-supported through the WindPROSPER project. The windPROSPER project is co-funded by the Danish Innovation Fund and the EuroStars framework programme.

Attribution

If data from this dataset is used within any private or public disseminations, then EMD and its data providers must be acknowledged.

Source: 
EMD-WRF South Korea (ERA5) - Copyright (c) - EMD International A/S, 2019. Distribution through EMD and windPRO.
This dataset uses ERA5 which is being developed through the Copernicus Climate Change Service (C3S). 
Data processing and distribution for ERA5 is carried out by ECMWF.

External Links

• WindPROSPER at Eurostars
• Innovation Fund Denmark - https://innovationsfonden.dk
• ERA5 availability page: : https://cds.climate.copernicus.eu/cdsapp#!/dataset/reanalysis-era5-single-levels?tab=form