Sentences with phrase «mean ozone level»

For all three regions, the figures for the past two winter - spring seasons are the lowest ever observed, and statistically well below the mean ozone level in these areas.

The process can reverse at night, meaning ozone levels near the surface often vary greatly during a single day.

Not exact matches

Ground - level ozone is a secondary pollutant, meaning that it is not emitted directly, but forms when sunlight triggers reactions between natural and human - caused chemical emissions, known as ozone precursor gases.

European mean ground ozone levels are declining, not rising as could be expected from a possible warming trend.

The electron belt is on top of the proton belt, the so called van Allen belts, then there is the upper ionosphere which tends negative and the lower ionosphere that tends positive, and this coupling impact, and space particles attracted to opposing sings and a dance of high energy particles that come with O2 splitting and ozone level increases, namely toward the tropics, while the closing isobars bring particles to the poles... all mean that flaring has a HUGE electrical meaning.

«The Arctic stratospheric ozone variations lead ENSO by 18 — 24 months, which means that it could be possible to extend the ENSO predictability from the current forecast level of several months up to around one and a half years in advance,» Jianping Li of Beijing Normal University told environmentalresearchweb.