Determination of the triple oxygen isotopic composition of tropospheric ozone in terminal positions using a multistep nitrite-coated filter-pack system.

We accurately determined the δ18 O and Δ17 O values of tropospheric O3 by blank correction using our new method. Measurements of Δ17 O(O3 )term of the ambient troposphere showed 1.1 ± 0.7‰ diurnal variations between daytime (higher) and nighttime (lower) due likely to the formation of the temperature inversion layer at night.