Instead, we pressurize two glass flasks with outside ambient air once a week. These flasks are then shipped to our Boulder lab for analysis. We are utilizing two electron-capture gas chromotographs to measure CFCs. And as a complement to this, steel flasks are pressurized with outside ambient air, which are then sent to Boulder for analysis. Surface ozone is measured using the Dasibi.
Stratospheric ozone is measured using two different instruments.
The Dobson spectrophotometer is used to measure total column ozone. We also utilize high altitude balloons to determine the atmospheric ozone profile. The Dobson operates on the principle of measuring the relative intensitities of selected pairs of ultraviolet wavelengths. One wavelength which is absorbed by ozone and the other which is unaffected by ozone. The high altitude balloons rise through the atmosphere while pumping outside air into a electrochemical concentration cell ozonesonde.