ISSN:
1573-0662
Keywords:
O3
;
budget
;
mid-latitude
;
lower stratosphere
;
temperature dependence
;
aerosol loading
;
chemistry
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Geosciences
Notes:
Abstract A photochemical box model including a detailed heterogeneous chemistrymodule has been used to analyze in detail the effects of temperature andaerosol surface area on odd oxygen production/depletion in the lowerstratosphere at 30° S. Results show that for background aerosolloading, the hydrolysis of BrONO2 and N2O5are most important atall temperatures studied except when the temperature falls below about205 K, when ClONO2 hydrolysis becomes most important. Thisprocessing leads to removal of active nitrogen to form nitric acid andenhancement of HOx, BrOx, ClOx levels. Detailed O3 budgets asa function of temperature are presented showing how ozone loss andproduction terms vary with changes in stratospheric sulfate aerosol loadingfor the individual families. For (most) aerosol loading levels, thelargest ozone losses occurred at warmer temperatures due to the strongtemperature dependence of the NOx ozone-destroying reactions. Theexception to this occurred for the conditions representative of volcanicloading, which showed a strong increase in ozone destruction due toincreases in destruction from the ClOx and HOx families.The ozoneproduction term k[NO][HO2] did not show a strong dependence oneithertemperature or aerosol loading, due to the offsetting effect of reducedNOxand increased HOx concentrations.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1006280926678
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