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<p>Here is a plot of the vertical column densities of NO2 and O3 from an ultraviolet-visible spectrometer in Fairbanks, Alaska. It is interesting to see that when NO2 dips, O3 rises, and vice versa. Also, because the scale of both the graphs is so different, I cannot plot them together, which makes it difficult to see if the dips in both the plots is occurring simultaneously. This is important to verify the fact that is the instrument compromised by any kind of artefact or not. I was thinking of doing a dy/dx (where y=NO2 and x=O3) to see if the sign is the same, meaning that both the measurements are following the same pattern. Otherwise, the general trend of both the measurements is supposed to be opposite. Is this a good way to check my hypothesis?</p>

CC BY-SA 4.0
2018-05-28T09:47:15.240Z
Both of them are strong oxidisers, so I doubt they react with each other. There might be a separate reason for it.
Gimelist
CC BY-SA 4.0
2018-05-28T09:54:26.190Z
In fact, they do. NO2 + O3 -> NO3 + O2; NO2 + NO3 <-> N2O5. This reaction was published in the following paper: https://pubs.acs.org/doi/pdf/10.1021/j100907a003
Sujai Banerji
CC BY-SA 4.0
2018-05-28T14:00:36.803Z
You have the cycle `NO + O -> NO_2` and `NO_2 + h \nu -> NO + O`. Whereas the `O` comes from `O_3`. Thus, if you have a lot of `NO_2` and solar radiation (`h \nu`), you can expect to get a lot of ozone. Or the other way around: a lot of ozone plus `NO` leads to higher levels of `NO_2`.
daniel.heydebreck
CC BY-SA 4.0
2018-05-28T18:25:46.527Z
http://www-personal.umich.edu/~sillman/ozone.htm#OZO1.2.1 may be of use
f.thorpe
CC BY-SA 4.0
2018-05-29T22:56:02.033Z
In areas where like the Arctic, where the concentration of NO2 is much lesser than the concentration of O3, which mechanism would dominate? The one in which both increase or the one in which one of them increases.
Sujai Banerji
CC BY-SA 4.0
2018-05-30T07:33:58.090Z
The NO-to-NO2-ratio, the total amount of NO+NO2, and the amount of solar radiation are important factors, which govern this process. If you have low NO+NO2 concentrations and their emissions are low (anthropogenic combustion) then it won't interact much with you O3.
daniel.heydebreck
<meteorology><atmospheric-chemistry>
Do NO2 and O3 titrate each other out in the atmosphere?
Sujai Banerji
# Do NO2 and O3 titrate each other out in the atmosphere?

(Asked by: username_0 on 2018-05-28)

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Here is a plot of the vertical column densities of NO2 and O3 from an ultraviolet-visible spectrometer in Fairbanks, Alaska. It is interesting to see that when NO2 dips, O3 rises, and vice versa. Also, because the scale of both the graphs is so different, I cannot plot them together, which makes it difficult to see if the dips in both the plots is occurring simultaneously. This is important to verify the fact that is the instrument compromised by any kind of artefact or not. I was thinking of doing a dy/dx (where y=NO2 and x=O3) to see if the sign is the same, meaning that both the measurements are following the same pattern. Otherwise, the general trend of both the measurements is supposed to be opposite. Is this a good way to check my hypothesis?

**Tags:** meteorology, atmospheric-chemistry

> **Comments:**
> **username_1**: Both of them are strong oxidisers, so I doubt they react with each other. There might be a separate reason for it.  
> **username_0**: In fact, they do. NO2 + O3 -> NO3 + O2; NO2 + NO3 <-> N2O5. This reaction was published in the following paper: https://pubs.acs.org/doi/pdf/10.1021/j100907a003  
> **username_2**: You have the cycle `NO + O -> NO_2` and `NO_2 + h \nu -> NO + O`. Whereas the `O` comes from `O_3`. Thus, if you have a lot of `NO_2` and solar radiation (`h \nu`), you can expect to get a lot of ozone. Or the other way around: a lot of ozone plus `NO` leads to higher levels of `NO_2`.  
> **username_3**: http://www-personal.umich.edu/~sillman/ozone.htm#OZO1.2.1 may be of use  
> **username_0**: In areas where like the Arctic, where the concentration of NO2 is much lesser than the concentration of O3, which mechanism would dominate? The one in which both increase or the one in which one of them increases.  
> **username_2**: The NO-to-NO2-ratio, the total amount of NO+NO2, and the amount of solar radiation are important factors, which govern this process. If you have low NO+NO2 concentrations and their emissions are low (anthropogenic combustion) then it won't interact much with you O3.  

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## 0 answers

