Simultaneous measurements of OClO, NO2 and O-3 in the Arctic polar vortex by the GOMOS instrument
- ISSN: 1680-7316
We present the first nighttime measurements of OClO from a limb-viewing\nsatellite instrument in the Arctic polar vortex. The relationship\nbetween OClO, NO2 and O-3 slant column densities in the Arctic polar\nvortex are analyzed from the GOMOS measurements. The retrieval process\nis based on a differential optical absorption spectroscopy (DOAS) method\napplied on the weighted median GOMOS transmittances. A study of the\nlongitudinal distributions of OClO, NO2 and O-3 above 65 degrees north\nin January 2008 is presented. It shows a strong halogen activation in\nthe lower stratosphere and a strong denoxification in the entire\nstratosphere inside the Arctic polar vortex. Time series of temperatures\nand OClO, NO2 and O-3 slant column densities for the winters 2002/2003\nto 2007/2008 are also presented. They highlight the correlation between\ntemperature, OClO and NO2. The GOMOS instrument appears to be a very\nsuitable instrument for the monitoring of OClO, NO2 and O-3 in the\nstratosphere during nighttime.