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DatasetCDS Catalogue FormOverall SizeDays on Disk
GloFAS climatologyhttps://cds.climate.copernicus.eu/cdsapp#!/dataset/cems-glofas-historical?tab=overview86GB30
GloFAS forecasthttps://cds.climate.copernicus.eu/cdsapp#!/dataset/cems-glofas-forecast7.6TB15

GloFAS reforecast

https://cds.climate.copernicus.eu/cdsapp#!/dataset/cems-glofas-reforecast6TB0 (unless recently requested)
GloFAS seasonal forecasthttps://cds.climate.copernicus.eu/cdsapp#!/dataset/cems-glofas-seasonal0.5TB10 days for most recent forecast
GloFAS seasonal reforecasthttps://cds.climate.copernicus.eu/cdsapp#!/dataset/cems-glofas-seasonal-reforecast8.75TB0 (unless recently requested)
EFAS climatologyhttps://cds.climate.copernicus.eu/cdsapp#!/dataset/efas-historical

817GB

30
EFAS forecasthttps://cds.climate.copernicus.eu/cdsapp#!/dataset/efas-forecast26.49TB10
EFAS reforecasthttps://cds.climate.copernicus.eu/cdsapp#!/dataset/efas-reforecast25.95TB0 (unless recently requested)
EFAS seasonal forecasthttps://cds.climate.copernicus.eu/cdsapp#!/dataset/efas-seasonal0.5TB10 days for most recent forecast
EFAS seasonal reforecasthttps://cds.climate.copernicus.eu/cdsapp#!/dataset/efas-seasonal-reforecast13.25 TB0 (unless recently requested)

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Request strategy

Table 2 - Summary

Dataset
CDS Catalogue Form
API field limits
Final
Downloaded data sizeRequest strategyLink to example script
GloFAS climatology
https://cds.climate.copernicus.eu/cdsapp#!/dataset/cems-glofas-historical?tab=overview
5002 GBLoop over years
API request

GloFAS forecast
https://cds.climate.copernicus.eu/cdsapp#!/dataset/cems-glofas-forecast
608.1 GBloop over years, months, days
API request

GloFAS

reforecasthttps://cds.climate.copernicus.eu/cdsapp#!/dataset/cems-glofas-

reforecast

95032 GB

loop over months, days

Subset to ROI

API request

GloFAS seasonal forecast
https://cds.climate.copernicus.eu/cdsapp#!/dataset/cems-glofas-seasonal
12531.5 GB

Loop over years, months

Subset to ROI

API request

GloFAS
seasonal reforecasthttps://cds.climate.copernicus.eu/cdsapp#!/dataset/cems-glofas-
seasonal
-
reforecast12531.5 GB

Loop over years, months

Subset to ROI

API request

EFAS climatology
https://cds.climate.copernicus.eu/cdsapp#!/dataset/efas-historical

1000

to be confirmedto be confirmedto be confirmed
EFAS
forecasthttps://cds.climate.copernicus.eu/cdsapp#!/dataset/efas-
forecast1000to be confirmedto be confirmedto be confirmed
EFAS reforecast
https://cds.climate.copernicus.eu/cdsapp#!/dataset/efas-reforecast
200to be confirmedto be confirmedto be confirmed
EFAS seasonal forecast
https://cds.climate.copernicus.eu/cdsapp#!/dataset/efas-seasonal
220to be confirmedto be confirmedto be confirmed
EFAS
seasonal reforecasthttps://cds.climate.copernicus.eu/cdsapp#!/dataset/efas-
seasonal
-
reforecast220to be confirmedto be confirmedto be confirmed

Speed up retrieval through concurrency:

The CDS enforces a per user limit to the number of requests that can be processed in parallel. This limit is 10 parallel requests running at the same time. The are also 'global limits' that can affect the user requests. More information here.

Whilst submitting multiple requests can improve the tasks' index in the queuing system, the user needs to understand that download time, overloading the system with too many requests will eventually slow down the overall system performance.

Indeed the CDS system penalises users that submit too many requests, decreasing the priority of their requests. 

                                                                                         Too many parallel requests could eventually result in a slower overall download time 

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