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Emissions of halogen source gases at Earth‘s surface 2. Accumulation

Q6: What are the principal steps in stratospheric ozone depletion caused by human activities ?. Emissions of halogen source gases at Earth‘s surface 2. Accumulation in the atmosphere ( highly unreactive in the lower atmosphere ) 3. Transport to the stratosphere by air motions

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Emissions of halogen source gases at Earth‘s surface 2. Accumulation

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  1. Q6: Whataretheprincipalsteps in stratosphericozonedepletioncausedby human activities? • Emissions ofhalogen sourcegasesatEarth‘ssurface 2. Accumulation in theatmosphere (highlyunreactive in theloweratmosphere) 3. Transport tothestratospherebyairmotions 4. Conversion in thestratospheretoreactive halogen gases(chemicalreactionsinvolving UV-radiation) 5. Chemical reaction chemicaldepletionofstratosphericozone PSCs: singnificantlyincreaseofreactive halogen gases in polar regions in winter/spring 6. Removal bymoisture in cloudsand rain in thetrosposphere, after returntotrophosphere

  2. Q6: Whataretheprincipalsteps in stratosphericozonedepletioncausedby human activities? • Some halogen gasesareemittedfromnaturalsources– partofthenaturalbalance • Some halogen sourcegasesundergochemicalconversion in thetroposphere • Gases withlongerlifetimeshaveslowerconversionrates • Understanding ofstratosphericozonedepletion: • Laboratory studies • Observations • Computer models

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