Spatial and temporal variability of stratospheric HNO 3 from IASI global measurements
2016
Nitric acid (HNO 3 ) plays a crucial role in the stratospheric ozone cycles but its spatial distribution
was until recently only accessible from limb satellite measurements, with medium coverage and
sampling. IASI provides since 2007 HNO 3 concentration distributions with unprecedented spatial and
temporal sampling, which have not yet been exploited.
In this presentation, we will first briefly review the characteristics of the HNO 3 profiles retrieved
from IASI and we will show results from a validation exercise, in which the HNO 3 profiles and total
columns from IASI are compared with those retrieved from ground-based measurements at several
sites.
We will then show and discuss the spatial distributions of HNO 3 IASI total and stratospheric columns
and assess the seasonal and inter-annual variability of HNO 3 using the 8 years of IASI observations
available. Preliminary results from a simple multivariable regression model applied to these time
series will be shown to support the analysis and to identify the principal processes driving the
variability of stratospheric HNO 3 . In this discussion focus will be given onto the polar regions, where
the relation of HNO 3 to ozone will be investigated in greater details.
With these results, the potential of using IASI for studying stratospheric chemistry will be more
generally highlighted.
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