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Use of a Battery of Chemical and Ecotoxicological Methods for the Assessment of the Efficacy of Wastewater Treatment Processes to Remove Estrogenic Potency

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Quantifying denitrification and its effect on ozone recovery

Tabazadeh¹, Santee, Danilin

¹NASA Ames Research Center, MS 245-4, Moffett Field, CA 94035-1000, USA. NASA Jet Propulsion Laboratory, MS 183-701, Pasadena, CA 91109, USA. Atmospheric and Environmental Research, Inc., 840 Memorial Drive, Cambridge, MA 02139-3794, USA. Departme.

Science (New York, N.Y.)

|May 29, 2000

Summary

Extensive denitrification, a process affecting ozone recovery, is observed in the Antarctic. Future Arctic conditions may lead to similar events, potentially increasing ozone loss by 30%.

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Area of Science:

Atmospheric chemistry
Stratospheric research
Ozone layer dynamics

Background:

Upper Atmosphere Research Satellite (UARS) data reveals unique Antarctic denitrification patterns.
Denitrification in warmer Antarctic conditions raises concerns for the Arctic.

Purpose of the Study:

To assess the likelihood of Arctic denitrification under future climate scenarios.
To quantify the potential impact of Arctic denitrification on ozone recovery.

Main Methods:

Analysis of UARS observations for Antarctic denitrification and dehydration.
Modeling polar stratospheric cloud lifetimes for Arctic conditions.
Simulating future Arctic ozone loss with denitrification.

Main Results:

Antarctic denitrification occurs without significant dehydration in mid-to-late June.
Model calculations define polar stratospheric cloud lifetimes necessary for Arctic denitrification.
Widespread Arctic denitrification could increase ozone loss by up to 30%.

Conclusions:

Future Arctic denitrification is plausible under colder, more humid stratospheric conditions.
Enhanced Arctic ozone loss is a significant risk associated with future denitrification events.
Understanding polar stratospheric cloud dynamics is crucial for predicting ozone layer recovery.