N2O mixing ratio zonal mean and trend in the UTLS from aircraft and balloon measurements

### N2O mixing ratio zonal mean

Zonal mean N2O binned by latitude and pressure for the year 2018, including all the data (balloon, aircraft and space Shuttle) from 1987 to 2018, which were nomalized to 2018 for DJF, MAM, JJA and SON. For that normalization, the average trend observed in the troposphere of 0.89 ppb/yr is used to calculate the N2O concentration for each measurement and adjusted to 2018. Then, by considering the adjusted datasets, instrumental error-weighted averages are calculated in latitude boxes of 10° width (for all longitudes) and 60 pressure levels (from 600 hPa to 5 hPa).

### N2O trend in the UTLS from aircraft and balloon measurements versus pressure (hPa) for each latitude

Trend of N2O in ppb per year for all data (balloon, aircraft and Space Shuttle) selected between 1987 and 2018 according to the latitude bands: North and South Polar regions (± [90 - 60]°N), Northern and Southern midlatitudes (± [60 - 30]°N) and Tropics (±30°). The trend was extract from the slope for the plot concentration=f(time) of each latitudes bands for all the pressure. The error bars represent the standard deviation of the slope for the plot concentration versus time.

#### Description of the N2O_trend.csv file:

- 1st col: Pressure (hPa)
- 2nd col: trend (ppbv/yr)
- 3rd col: standard deviation on trend (ppbv/yr)

Column separated by “;”

All these column repeat 5 times: For latitude:
[-90°N ; -60°N] ; [-60°N ; -30°N]; [-30°N ; 30°N]; [30°N ; 60°N]; [60°N ; 90°N]