ERA5Reanalysis.jl

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Variable Types in ERA5Reanalysis.jl ​

In order to download data from the Climate Data Store, we need to specify at least a variable to download. This variable can be one found directly from CDS, or it can be a custom user-defined variable (in which case it has to be calculated by the user). Information regarding this variable will be loaded into an ERA5Variable.

Setup ​

julia
using ERA5Reanalysis

The ERA5Variable Type ​

Missing docstring.

Missing docstring for ERA5Variable. Check Documenter's build log for details.

SingleLevel and PressureLevel Variables ​

There are two main ERA5Variable types in ERA5 reanalysis:

  • SingleLevel variables - such as surface temperature, or total cloud cover, provided in the (lon, lat) space

  • PressureLevel variables - such as atmospheric temperature, or specific humidity, provided in the (lon, lat, pressure) space

SuperTypeCDS VariableCustom Variable
SingleLevelSingleVariableSingleCustom
PressureLevelPressureVariablePressureCustom
ERA5Reanalysis.SingleLevel Type
julia
SingleLevel <: ERA5Variable

Abstract supertype for Single-Level variables, with the following subtypes:

julia
SingleVariable <: SingleLevel
SingleCustom   <: SingleLevel
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ERA5Reanalysis.PressureLevel Type
julia
PressureLevel <: ERA5Variable

Abstract supertype for Single-Level variables, with the following subtypes:

julia
PressureVariable <: PressureLevel
PressureCustom   <: PressureLevel
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Custom ERA5Variables ​

Each of these supertypes are further broken down into XXVariable and XXCustom subtypes:

  • XXVariable represents a variable that is available directly from CDS

  • XXCustom variables are user-defined variables

Warning

XXCustom variables cannot be downloaded - trying to do so will result in a method error - and can only be calculated from existing variable data.

ERA5Reanalysis.SingleVariable Type
julia
SingleVariable <: SingleLevel

Subtype for Single-Level variables that can be directly retrieved from the Climate Data Store.

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ERA5Reanalysis.SingleCustom Type
julia
SingleCustom <: SingleLevel

Subtype for custom user-defined Single-Level variables, which can only be calculated and not downloaded from the Climate Data Store.

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ERA5Reanalysis.PressureVariable Type
julia
PressureVariable <: PressureLevel

Subtype for Pressure-Level variables that can be directly retrieved from the Climate Data Store.

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ERA5Reanalysis.PressureCustom Type
julia
PressureCustom <: PressureLevel

Subtype for custom user-defined Pressure-Level variables which can only be calculated and not downloaded from the Climate Data Store.

source