Examination of tracer-tracer correlations between NOy and N2O, and between NOy and O3 using ACE-FTS measurements

Details Examination of tracer-tracer correlations between NOy and N2O, and between NOy and O3 using ACE-FTS measurements Examination of tracer-tracer correlations between NOy and N2O, and between NOy and O3 using ACE-FTS measurements

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsa33a..07q&link_type=abstract

American Geophysical Union, Spring Meeting 2009, abstract #SA33A-07

Physics

0340 Middle Atmosphere: Composition And Chemistry, 0341 Middle Atmosphere: Constituent Transport And Chemistry (3334)

Scientific paper

Correlations between long-lived species provide a useful tool for investigating both dynamical and chemical processes in the atmosphere. Global tracer-tracer correlations between total odd nitrogen (NOy) and N2O, and between NOy and O3 have been studied using measurements made by the Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS) on the Canadian Space Agency's SciSat platform. ACE-FTS has been measuring O3, N2O, and NOy species from orbit since February 2004 using infrared solar occultation. NOy is calculated by using measurements of NO, NO2, N2O5, HNO3, ClONO2, and HNO4. The seasonal and monthly correlations between NOy and N2O, and between NOy and O3 have been investigated in the equatorial region, at mid-latitudes, and in the polar regions using the first four years of ACE-FTS data. The correlations between NOy and N2O show a compact relationship, with the exception of the southern hemisphere polar spring, due to denitrification and descent of N2O inside the polar vortex. The correlations between NOy and O3 are not compact in all seasons. In spring in both polar regions, particularly in the southern hemisphere, the mixing ratios of both O3 and NOy are low due to ozone depletion and denitrification. We will present the results of this correlation study and assess them in comparison with previous measurements of NOy correlations.

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