Missing chemistry of reactive nitrogen in the upper stratospheric polar winter
Data from the CLAES on UARS indicate that a significant mechanism for production of HNO3 in the middle to upper stratosphere is missing from the chemical reaction set currently used by atmospheric models. Measured HNO3 in the polar vortex is strongly enhanced relative to the extra‐vortex at 1200 K p...
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Published in | Geophysical research letters Vol. 22; no. 19; pp. 2629 - 2632 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Washington, DC
Blackwell Publishing Ltd
01.10.1995
American Geophysical Union |
Subjects | |
Online Access | Get full text |
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Summary: | Data from the CLAES on UARS indicate that a significant mechanism for production of HNO3 in the middle to upper stratosphere is missing from the chemical reaction set currently used by atmospheric models. Measured HNO3 in the polar vortex is strongly enhanced relative to the extra‐vortex at 1200 K potential temperature (near 3 mbar) in January, 1992. The HNO3 vertical profile shows this enhancement forms a secondary altitude maximum from about 10 to 2 mbar (800‐1500 K). A chemistry/transport model (CTM) simulation of this period produces no increase of HNO3 in the vortex near 3 mbar and no secondary maximum in the HNO3 profile. Furthermore, the CTM produces relatively high N2O5 in the vortex, with a vertical peak near 3 mbar, while both CLAES and ISAMS show a shallow minimum there. The implication of this comparison is that some unmodeled process is acting to enhance HNO3 and reduce N2O5 at high latitudes in the winter middle and upper stratosphere. Heterogeneous conversion of N2O5 to HNO3 on hydrated ion clusters is proposed as a possibility for the missing mechanism. |
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Bibliography: | istex:73FE2D4B7079105AC3EF5DCB7E25AF816CDFE338 ArticleID:95GL02336 ark:/67375/WNG-WHLSBJ02-P ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 ObjectType-Article-2 ObjectType-Feature-1 |
ISSN: | 0094-8276 1944-8007 |
DOI: | 10.1029/95GL02336 |