July 2004 at Lerwick and Reading
Lerwick reported a low ozone event on July 27th and this feature covered most of the UK. Reading also reported the lowest values of the year during this time, but there is insufficient climatology to quantify the size of the anomaly. Valencia in Ireland showed an anomaly of about -10%. This feature can be traced to strong cyclonic anomaly centred east of Greenland at this time, which by southerly warm advection lifted the tropopause and transported ozone poor air from over the UK.
Lerwick reported a low ozone event on July 27th and this feature covered most of the UK. Reading also reported the lowest values of the year during this time, but there is insufficient climatology to quantify the size of the anomaly. Valencia in Ireland showed an anomaly of about -10%. This feature can be traced to strong cyclonic anomaly centred east of Greenland at this time, which by southerly warm advection lifted the tropopause and transported ozone poor air from over the UK.