THE DIURNAL-VARIATION OF HYDROGEN, NITROGEN, AND CHLORINE RADICALS - IMPLICATIONS FOR THE HETEROGENEOUS PRODUCTION OF HNO2 Academic Article uri icon

abstract

  • 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 ]. Copyright 1994 by the American Geophysical Union.

published proceedings

  • GEOPHYSICAL RESEARCH LETTERS

altmetric score

  • 3

author list (cited authors)

  • SALAWITCH, R. J., WOFSY, S. C., WENNBERG, P. O., COHEN, R. C., ANDERSON, J. G., FAHEY, D. W., ... BOWEN, S. W.

citation count

  • 78

complete list of authors

  • SALAWITCH, RJ||WOFSY, SC||WENNBERG, PO||COHEN, RC||ANDERSON, JG||FAHEY, DW||GAO, RS||KEIM, ER||WOODBRIDGE, EL||STIMPFLE, RM||KOPLOW, JP||KOHN, DW||WEBSTER, CR||MAY, RD||PFISTER, L||GOTTLIEB, EW||MICHELSEN, HA||YUE, GK||PRATHER, MJ||WILSON, JC||BROCK, CA||JONSSON, HH||DYE, JE||BAUMGARDNER, D||PROFFITT, MH||LOEWENSTEIN, M||PODOLSKE, JR||ELKINS, JW||DUTTON, GS||HINTSA, EJ||DESSLER, AE||WEINSTOCK, EM||KELLY, KK||BOERING, KA||DAUBE, BC||CHAN, KR||BOWEN, SW

publication date

  • November 1994