In:
Geophysical Research Letters, American Geophysical Union (AGU), Vol. 21, No. 23 ( 1994-11-15), p. 2551-2554
Kurzfassung:
In situ measurements of hydrogen, nitrogen, and chlorine radicals obtained through sunrise and sunset in the lower stratosphere during SPADE are compared to results from a photochemical model constrained by observed concentrations of radical precursors and environmental conditions. Models allowing for heterogeneous hydrolysis of N 2 O 5 on sulfate aerosols agree with measured concentrations of NO, NO 2 , and ClO throughout the day, but fail to account for high concentrations of OH and HO 2 observed near sunrise and sunset. The morning burst of [OH] and [HO 2 ] coincides with the rise of [NO] from photolysis of NO 2 , suggesting a new source of HO x that photolyzes in the near UV (350 to 400 nm) spectral region. A model that allows for the heterogeneous production of HNO 2 results in an excellent simulation of the diurnal variations of [OH] and [HO 2 ].
Materialart:
Online-Ressource
ISSN:
0094-8276
,
1944-8007
Sprache:
Englisch
Verlag:
American Geophysical Union (AGU)
Publikationsdatum:
1994
ZDB Id:
2021599-X
ZDB Id:
7403-2
SSG:
16,13
Permalink