Read ECMWF data ERA 5

ERA5 is the latest development in the ERA series, and  improves significantly on its predecessors by:

- Offering a higher horizontal resolution of 31 km and 137 vertical levels from the surface up to 0.01 hPa (around 80 km);

- Using a more recent and advanced version of the ECMWF IFS model;

- Providing hourly estimates of atmospheric variables;

- Providing a consistent representation of uncertainties for these variables;

- Using more satellite observations in the data assimilation.

Here are some information to access this database using python batch

Please visit http://climate.copernicus.eu/climate-reanalysis for more information including documentation and guidelines on how to download the data.

__________

June 2025

The new ECMWF methodology cannot use R directly. The solution I found to download data in MacOSX was:

https://cds.climate.copernicus.eu/datasets/reanalysis-era5-single-levels?tab=overview

To install the CDSAPI using pip, the solution is to create a virtual environnement of python:

For example, here the virtual environment is py_envs:

python3 -m venv ~/py_envs

source ~/py_envs/bin/activate

# Within this environment, I can install the cdsapi using pip:

pip install cdsapi

# And then I can run the python code downloaded from https://cds.climate.copernicus.eu/datasets/reanalysis-era5-single-levels?tab=overview

For example here the code is store in loadFl:

cat loadFl

_______________________

import cdsapi
dataset = "reanalysis-era5-single-levels"
request = {
    "product_type": ["reanalysis"],
    "variable": ["2m_temperature"],
    "year": [
        "2019", "2020", "2021",
        "2022", "2023", "2024"
    ],
    "month": [
        "01", "02", "03",
        "04", "05", "06",
        "07", "08", "09",
        "10", "11", "12"
    ],
    "day": [
        "01", "02", "03",
        "04", "05", "06",
        "07", "08", "09",
        "10", "11", "12",
        "13", "14", "15",
        "16", "17", "18",
        "19", "20", "21",
        "22", "23", "24",
        "25", "26", "27",
        "28", "29", "30",
        "31"
    ],
    "time": [
        "00:00", "01:00", "02:00",
        "03:00", "04:00", "05:00",
        "06:00", "07:00", "08:00",
        "09:00", "10:00", "11:00",
        "12:00", "13:00", "14:00",
        "15:00", "16:00", "17:00",
        "18:00", "19:00", "20:00",
        "21:00", "22:00", "23:00"
    ],
    "data_format": "grib",
    "download_format": "zip",
    "area": [26.5, -80.25, 26.25, -80]
}
client = cdsapi.Client()
client.retrieve(dataset, request).download()

____________

It can be run using:

python3 loadFl

Then go to:

https://cds.climate.copernicus.eu/datasets/reanalysis-era5-single-levels?tab=overview

Follow the link "Your request"

And you can monitor your request and download the result when it is done.




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