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Dataset ECMWF ERA5 Tutorial

Mail to jhshin@apcc21.org

Overview
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ERA5 is the fifth generation of ECMWF reanalysis for the global climate and weather for the past 4 to 7 decades. Currently, data is available from 1979. The ERA5 reanalysis will be completed by 2020, by when the dataset will cover the period from 1950 to present. ERA5 replaces the ERA-Interim reanalysis. ERA5 was produced using 4D-Var data assimilation in CY41R2 of ECMWF’s Integrated Forecast System (IFS), with 137 hybrid sigma/pressure levels in the vertical, with the top level at 0.01 hPa. ERA5 includes information about uncertainties for all variables at reduced spatial and temporal resolution. Data has been regridded to a regular lat-lon grid of 0.25 degrees for the reanalysis and 0.5 degrees for the uncertainty estimate (0.5 and 1 degree respectively for ocean waves). Vertical resolution is 37 pressure levels from surface to 1 hPa.

Daily
Monthly
Hourly

Pressure level

Spatial resolution	0.25 X 0.25 (degree)
Temporal resolution	Daily
Levels	37 vertical levels from the surface up to 1 hPa
Parameters	Temperature(t) Geopotential(z) U component of wind(u) V component of wind(v) Relative humidity(r) Specific humidity(q) Vertical velocity(w)

Single level

Spatial resolution	0.25 X 0.25 (degree)
Temporal resolution	Daily
Parameters	2 metre temperature(t2m) 10 metre U wind component(u10) 10 metre V wind component(v10) Mean sea level pressure(msl) Surface pressure(sp)

Data Contributors: Copernicus Climate Change Service Climate Data Store (CDS)
Related Resource: ECMWF
ERA5 data Document

Timestep	DAILY MONTHLY HOURLY
Level	pressure single
Parameter	Please view overview page.
File name	DAILY	[Parameter]_YYYYMM.nc
	MONTHLY	[Parameter]_YYYY.nc
	HOURLY	[Parameter]_YYYYMM.nc

Timestep	DAILY MONTHLY HOURLY
Level	pressure single
Parameter	Please view overview page.
Year	Year value (YYYY)
Month	Month value (MM) for DAILY, HOURLY

Climate Information Services

Pressure level

Single level

Pressure level

Single level

Single level

Usage

Sample

Python API code

Variables

Spatial resolution	0.25 X 0.25 (degree)
Temporal resolution	Hourly
Parameters	2 metre temperature(t2m) Total precipitation(tp) Maximum temperature at 2 metres since previous post-processing (mx2t) Minimum temperature at 2 metres since previous post-processing (mn2t) Sea surface temperature(sst) Sea surface temperature(sst) Land-sea mask(lsm)