I am looking for global surface O3 concentration data to validate model results. Any idea or suggestions where I can find and download such datasets?
Many thanks!!
You can get the tropospheric ozone column globally from Tropomi: http://www.tropomi.eu/data-products/tropospheric-ozone-column
Actual ozone concentrations at ground level would be provided by air quality stations, most typically located in polluted areas. You need to ask your national environmental protection agency.
AQI stations may provide, specifically measuring aerosols and gases may provide you with surface datasets.
AERONET provides only total column ozone, so you won't be using that
one way would be to use the tropospheric ozone column provided by several satellites.
Explore TROPOMI/S5P ATBD of tropospheric ozone data products and
OMI datasets.
However, you need to collocate, both sets of data and then derive the validation statistics
Pravash Tiwari : Aeronet only provides a climatology of the total ozone column, not instantaneous values of tropospheric or ground-level ozone...
Chris Gueymard : Yes sir Agreed, I tried to point out that aeronet has ozone but not surface but total column.
So I think the best bet is to use satellite platforms.
I am not sure if AQI stations in different countries readily provide the surface ozone concentration.
Thank you Erik Hans Hoffmann
for sharing the link. On exploring the link you shared, I found some options for both total and vertical ozone columns. Total column ozone has many data points as seen in the global map compared to the vertical one. Since I am looking for surface ozone, I downloaded the vertical ozone profile CSV data, but those CSV file doesn't have ozone concentration column, which is the most essential to compare. Did I miss some steps or I don't know why that part is missing on downloading?Dear Pravash Tiwari and Chris Gueymard , yes I also think satellite data with tropospheric ozone (not total columnar) should also be ok to be taken as surface ozone. I found OMI just have total ozone (not surface) and sentinel data is from 2018 (since it is launched in 2017). I am specifically looking for the 2010 global ozone data (no matter daily/monthly/yearly). I think reanalysis data should also be ok to validate results, do you have any idea on this like which reanalysis data provides surface global ozone data, any links?
Looking forward to hearing from you.
Many thanks!
Hemraj Bhattarai: Hemraj, reanalysis datasets are assimilated from a combination of various observations as well as models. I don't think it will be wise to use a reanalysis data product created from blending observations and models again to validate your model output.
Usually, model output is validated with observation (ground or remotely sensed)
But however, you can find the ozone mass mixing ratio (MMR) from ERA5
search it in the product section : https://cds.climate.copernicus.eu/cdsapp#!/dataset/reanalysis-era5-pressure-levels?tab=overview (grabbing data for 1000 mb ~ near ground, may serve your purpose)
You can convert the unit to DU.
But do consider my above query before proceeding.
Hope this helps
Pravash
Umer Hayat : This USGS site is only for North America, and I don't see any surface ozone product
In order to get the highest quality data please contact the monitoring service provided by Copernicus:
https://www.ecmwf.int/en/about/what-we-do/environmental-services/copernicus-atmosphere-monitoring-service
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