CAMS EU vs CAMS accuracy
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Re: CAMS vs CAMS EU
Hi, just referencing this reply, does this mean that CAMS EU is a better model? The difference with CAMS data for air pollution is quiet noticeable.
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@costaco said in CAMS EU vs CAMS accuracy:
Re: CAMS vs CAMS EU
Hi, just referencing this reply, does this mean that CAMS EU is a better model? The difference with CAMS data for air pollution is quiet noticeable.
@costaco said in CAMS EU vs CAMS accuracy:
Re: CAMS vs CAMS EU
Hi, just referencing this reply, does this mean that CAMS EU is a better model? The difference with CAMS data for air pollution is quiet noticeable.
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@costaco Hello, it does not mean it is better, both models offer a different forecast based on a different calculation. We recommend to check both for the complete picture.
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@korina OK, thank you. Are both based on the same sensors? Trying to understand where such a big difference arises from.
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@costaco Hello, both of them are from CAMS Copernicus. Please also not, it is forecast not real-time values. For measured values, please check our Air quality stations - https://community.windy.com/topic/15186/monitor-real-time-air-quality-data-worldwide?_=1628157966971
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@costaco
You are right. The discrepancies between CAMS EU 10km and CAMS 40km are quite important.
https://community.windy.com/topic/8577/copernicus-atmosphere-monitoring-service-cams-data-and-forecast-are-now-accessible-on-windy/20?_=1628161788709I’ve tried to understand the differences in the observations used to get initial conditions and in processing the data to get analysis and forecast.
For both models observations are mainly done by satellites which are equipped with sensors for different pollutants and aerosols. But satellites can only measure the content of these gas/aerosols in the total height of the atmosphere.
In Windy some layer are expressed per sq.meters because the values is the amount in a column up to the top of atmosphere (Aerosol, SO2…).
Other layers are expressed per cubic meters and show amounts near the ground (NO2, PM2.5…). In this case it is more difficult to extrapolate these values from the satellites observation of the total thickness of the atmosphere.
And the models used by CAMS 10km and by CAMS 40km are not at all similars.
See the pages 2 and 3 of this pdf:
http://www.nereus-regions.eu/wp-content/uploads/2020/01/Copernicus-Atmosphere-Monitoring-Service_Jean-Noël-Thépaut-and-Vincent-Henri-Peuch.pdf
And some pages of this one too:
https://etrp.wmo.int/pluginfile.php/21447/mod_folder/content/0/Lecture6_Flemming.CAMS_products.final.pdf?forcedownload=1
So which layer is more accurate, CAMS-EU 10km or CAMS 40km? I would say the first one because of its higher resolution but mainly because of the multimodel processing and the large number of ground level observations in addition to the satellite ones.
