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Correction to the level heights of ERA5 variables
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An error has been included in the description of ERA5 variables. The
correct heights (levels) for each variable is now reflected in the
repository's description of the ERA5 dataset.

Reported-by: Peter Lawford <[email protected]>
Signed-off-by: Kasra Keshavarz <[email protected]>
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kasra-keshavarz committed Sep 27, 2024
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Expand Up @@ -40,17 +40,17 @@ The spatial extent of the `ERA5` is on latitutes from `+90` to `-90` and longitu
The time-steps are hourly covering from January 1950 to December 2020.

## Short Description on `ERA5` Variables
In most hydrological modelling applications, usually 7 variables are needed detailed as following: 1) specific humidity at 2 meters, 2) surface pressure, 3) air temperature at 2 meters, 4) wind speed at 10 meters, 5) precipitation, 6) downward short wave radiation, and 7) downward long wave radiation. These variables are available through the current `ERA5` dataset and their details are described in the table below:

|Variable Name |ERA5 Variable |Original Shortname|Parameter ID|Unit |IPCC abbreviation|Comments |
|---------------------|-------------------|------------------|------------|-----|-----------------|--------------------|
|surface pressure |airpres |sp |134 |Pa |ps | |
|specific humidity @2m|spechum |q |133 |kg/kg|huss | |
|air temperature |airtemp |t |130 |k |tas | |
|wind speed @10m |windspd |u,v |131,132 |m/s |wspd |WIND=SQRT(u<sup>2</sup>+v<sup>2</sup>)|
|precipitation |pptrate |mtpr |235055 |mm/hr| |mean total precipitation rate|
|short wave radiation |SWRadAtm |msdwswrf |235035 |W m-2|rsds | |
|long wave radiation |LWRadAtm |msdwlwrd |235036 |W m-2|rlds | |
In most hydrological modelling applications, usually 7 variables are needed detailed as following: 1) specific humidity, 2) surface pressure, 3) air temperature, 4) wind speed, 5) precipitation, 6) downward short wave radiation, and 7) downward long wave radiation. These variables are available through the current `ERA5` dataset and their details are described in the table below:

|Variable Name |ERA5 Variable |Original Shortname|Parameter ID|Unit |IPCC abbreviation|Comments |
|----------------------|-------------------|------------------|------------|-----|-----------------|--------------------|
|surface pressure |airpres |sp |134 |Pa |ps | |
|specific humidity @10m|spechum |q |133 |kg/kg|huss | |
|air temperature@10m |airtemp |t |130 |k |tas | |
|wind speed @10m |windspd |u,v |131,132 |m/s |wspd |WIND=SQRT(u<sup>2</sup>+v<sup>2</sup>)|
|precipitation |pptrate |mtpr |235055 |mm/hr| |mean total precipitation rate|
|short wave radiation |SWRadAtm |msdwswrf |235035 |W m-2|rsds | |
|long wave radiation |LWRadAtm |msdwlwrd |235036 |W m-2|rlds | |

For a complete catalog of the dataset, see [here](https://confluence.ecmwf.int/display/CKB/ERA5%3A+data+documentation).

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