Ambiguous variables

Software and Tools API
,
1

Hi,

I am experiencing a problem when trying to download wind speeds via the CDS API. Here is the error message:

Exception: the request you have submitted is not valid. Ambiguous : 100m_u_component_of_wind could be 10 METRE WIND GUST OF AT LEAST 10 METRE PER SECOND or WILDFIRE DRY MATTER COMBUSTION RATE DENSITY - Ambiguous : 100m_v_component_of_wind could be 10 METRE WIND GUST OF AT LEAST 10 METRE PER SECOND or WILDFIRE DRY MATTER COMBUSTION RATE DENSITY

And this is the script I use:

import cdsapi

c = cdsapi.Client()

c.retrieve(

‘reanalysis-era5-land’,

{

‘expver’: ‘0005’,

‘format’: ‘grib’,

‘variable’: [

‘100m_u_component_of_wind’, ‘100m_v_component_of_wind’,

],

‘year’: [

‘2015’, ‘2016’, ‘2017’,

‘2018’, ‘2019’

],

‘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’

],

‘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’

],

‘area’: [float(lat)+0.125, float(lon)-0.125, float(lat)-0.125, float(lon)+0.125],

‘grid’: [‘0.25’, ‘0.25’]

},

‘/download_5years_2vars.grib’

)


Can you think of any way to address this issue? Btw, downloading the variable "10m_u_component_of_wind" worked fine.


2

Hi,

the '100m_u_component_of_wind', '100m_v_component_of_wind' are not available in ERA5-Land. You can donwload them from ERA5.


Regards

Michela

3

Thank you Michela!

4

Hi,

I've the same problem trying to download 2PVU as PV level and Potenttial temperature as variable (vertical coordinate); here is the error message:

Exception: the request you have submitted is not valid. Ambiguous parameter: potential_vorticity_level could be PROCESS or PPENGINE - No request.;

and the relative script:


import cdsapi

>>>

>>> c = cdsapi.Client()

>>>

>>> c.retrieve(

... 'reanalysis-era5-single-levels-monthly-means',

... {

... 'product_type': 'monthly_averaged_reanalysis',

... 'variable': 'potential_temperature',

... 'potential_vorticity_level': '2000',

... 'year': '2020',

... 'month': '01',

... 'time': '00:00',

... 'format': 'netcdf',

... }

... )

Thanks a lot.

5

Hi,

this is a code example:

#!/usr/bin/env python
import cdsapi
c = cdsapi.Client()
c.retrieve('reanalysis-era5-complete', {
    'class': 'ea',
    'date': '20200101',
    'decade': '2020',
    'expver': '1',
    'levelist': '2000',
    'levtype': 'pv',
    'param': '3.128',
    'stream': 'moda',
    'grid': '0.25/0.25', # Latitude/longitude. Default: spherical harmonics or reduced Gaussian grid
    'format': 'netcdf',
    'type': 'an',
}, 'output.nc')

Please have a look at the following links for more details:

ERA5: data documentation#DataorganisationandhowtodownloadERA5

How to download ERA5#OptionB:DownloadERA5familydatathatisNOTlistedintheCDSonlinecatalogue-SLOWACCESS

Please be aware that there is an additional queueing system for downloading ERA5 complete data from the ECMWF's MARS archive - expect several hours to several days for submitted requests to complete at this time. You can check the Live status of your request


Thanks

Michela