Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
doi:10.5194/acpd-9-16233-2009
© Author(s) 2009. This work is distributed
under the Creative Commons Attribution 3.0 License.
 
29 Jul 2009
Review status
A revision of this discussion paper for further review has not been submitted.
Spatial and temporal variability in surface ozone at a high elevation remote site in Nepal
G. W. K. Moore1, S. Abernethy1, and J. L. Semple2 1Department of Physics, University of Toronto, Toronto, Canada
2Department of Surgery, University of Toronto, Toronto, Canada
Abstract. Ozone is an important atmospheric constituent due to its role as both a greenhouse gas and an oxidant. Recent measurements in the Mount Everest region indicate the presence of ozone at elevations from 5000 to 9000 m a.s.l. that are the result of both stratospheric and tropospheric sources. Here we examine the temporal variability in the surface ozone concentration measurements from the ABC-Pyramid Observatory in the Mount Everest region during 2006 and compare it to the total column ozone data from the OMI instrument as well as meteorological fields from the ECMWF Interim Reanalysis. Both the surface ozone at and the total column ozone over the ABC-Pyramid Observatory site have maxima in the pre-monsoon period. We show that during this period, there is a statistically significant correlation between the two suggesting that the stratosphere was an important contributor to the high levels of ozone observed during the period. There was a hiatus in the monsoon in June that resulted in a return of westerlies over northern Indian and southern Tibet and as a result, the aforementioned correlation extended into June. No such correlation exists during the monsoon and post-monsoon periods. Spatial correlation maps between the surface ozone and total column ozone as well as meteorological fields from the ECMWF Interim Reanalysis support the contention that there is a significant stratospheric contribution in the pre-monsoon period that is absent during and after the monsoon.

Citation: Moore, G. W. K., Abernethy, S., and Semple, J. L.: Spatial and temporal variability in surface ozone at a high elevation remote site in Nepal, Atmos. Chem. Phys. Discuss., 9, 16233-16266, doi:10.5194/acpd-9-16233-2009, 2009.
G. W. K. Moore et al.
Interactive discussionStatus: closed (peer review stopped)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version      Supplement - Supplement
 
RC C4196: 'Review', Anonymous Referee #1, 25 Aug 2009 Printer-friendly Version 
 
RC C5040: 'Refee Comments', Anonymous Referee #2, 21 Sep 2009 Printer-friendly Version 
 
RC C5162: 'Referee Comment', Anonymous Referee #3, 22 Sep 2009 Printer-friendly Version 
 
RC C5193: 'Interactive comment on "Spatial and temporal variability in surface ozone in Nepal by Moore et al.', Anonymous Referee #4, 24 Sep 2009 Printer-friendly Version 
G. W. K. Moore et al.
G. W. K. Moore et al.

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