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	Author	Bhattacharya, S.K.; Chakraborty, S.; Savarino, J.; Thiemens, M.H.
	Title	Low-pressure dependency of the isotopic enrichment in ozone: Stratospheric implications			Type	Journal Article
	Year	2002	Publication	Journal of geophysical research-atmospheres	Abbreviated Journal	J. Geophys. Res.
	Volume	107	Issue		Pages
	Keywords	1040 Geochemistry: Isotopic composition/chemistry; 4852 Oceanography: Biological and Chemical: Photochemistry
	Abstract	Stratospheric ozone is enriched in the heavy isotopes (17O and 18O) relative to the ambient oxygen from which it is formed. This enrichment varies with altitude, attaining very high values between 30 and 40 km. A recent theory of Y. Q. Gao and R. A. Marcus explores the reasons for isotopic enrichment in the process of ozone formation and is particularly useful to understand the laboratory results. The stratospheric variations are sought to be explained in terms of temperature dependence of isotopic enrichment, but the magnitude of variation does not match with predictions accurately. We demonstrate here that isotopic enrichment in ozone generated by oxygen photolysis depends on the pressure of the oxygen reservoir and can have very high values (at about 15 torr), comparable to the highest observed stratospheric values. Analysis of the data shows that secondary enrichment through ozone dissociation can add to the primary enrichment associated with ozone formation. The effect of dissociation is found to be more pronounced in the pressure range of 15 to 50 torr, resulting in high enrichment. It is shown that the relative kinetics, pressure and temperature conditions of ozone formation and dissociation play an important role in determining the ultimate value of the enrichment. The results are particularly useful to understand the stratospheric data and resolve the observed discrepancy.
	Programme	399
	Campaign
	Address
	Corporate Author				Thesis
	Publisher	American Geophysical Union	Place of Publication		Editor
	Language		Summary Language		Original Title
	Series Editor		Series Title		Abbreviated Series Title
	Series Volume		Series Issue		Edition
	ISSN	0148-0227	ISBN		Medium
	Area		Expedition		Conference
	Notes				Approved	yes
	Call Number	IPEV @ Thierry.Lemaire @			Serial	5611
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