O=S=O unit is µg/m³, not mg/m²
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@Caefix
SO2 unit in Windy is really mg/m2 because it is total amount of this gas in a column of 1 sq m2 from ground to the top of the atmosphere.
https://community.windy.com/topic/13315/probably-wrong-units-of-so2-concentration?_=1633122533978 -
@idefix37 said in O=S=O unit is µg/m³, not mg/m²:
top of the atmosphere.
Thx! Is meant top of troposphere?
https://en.wikipedia.org/wiki/TroposphereLatest Ulawun eruption ~30kt SO2 released...
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Copernicus provides SO2 detailed content up to 50 hPa level. So I guess the column is up to this level. I don’t think above it the SO2 amount is really significant. When the satellite sensor “takes the picture” it is the picture of the total column of SO2 even if this gas is not present up to the limit of the atmosphere.
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@idefix37 SO2 is sinking quite fast, so the Windy value / 10.000m is probably a quite good guess for the surface concentration.
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@Caefix
I don’t think you can extrapolate the value at ground level from the amount in the total column with a good accuracy. -
@Caefix
You can see per level the data from Copernicus. At ground level the SO2 amount is different from that at higher levels.
https://atmosphere.copernicus.eu/charts/packages/cams/products/sulphur-dioxide-forecasts?base_time=202311210000&layer_name=composition_so2_totalcolumn&projection=classical_global&valid_time=202311210300
Click Select dimensions -
@idefix37 Mainly winds and rain affect it. Sadly the air quality layer doesn´t mention it.
pH of precipitaion was another interesting value... -
@Caefix
See the amount per level by Copernicus
https://atmosphere.copernicus.eu/charts/packages/cams/products/sulphur-dioxide-forecasts?base_time=202311210000&layer_name=composition_so2_totalcolumn&projection=classical_global&valid_time=202311210300
Select Dimensions > Total column > levels -
@idefix37 Now I have an new bookmark for firefox. :)
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@Caefix
☁ The spread of Ulawun´s SO2 output is amazing.
🌋🤔🔥 The particle-animation seems to follow the wind @ 500hPa.
♨ 🐉 -
@Caefix
Sure, the Ulawun plume reaches the top of the troposphere, so it is certain that this volcano gases are mainly carried by the winds at high level and not by those near the ground. -
@idefix37 Now the animation seems groundlevel instead of 500hPa. What has changed?
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@Caefix
Why do you think that CO is at ground level ?
It has never been at 500 hPa level but in the total column from surface up to the top of atmosphere. -
@idefix37 A month ago (upper post) SO2-layer part. animation was different, as reported.
Two screenshots from 10 Dec 23:
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@Caefix
I don’t know why.
