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instrument (see Sect.
2
). Thus, usage of the whole Chappuis band in combination
with the solar spectrum normalization requires a very high quality of the inter-
channel calibration. One possible solution is to use only one wing of the Chappuis
absorption band recorded within one channel. In this case, the highly ef
cient triplet
method cannot be employed anymore. Instead, we exploit the differential structure
of the ozone absorption signature in the short wavelength wing of the Chappuis
absorption band and employ the DOAS technique (Platt
1994
) to retrieve the
vertical ozone pro
les. Differential limb spectra are obtained then as
y ¼ ln I(
k
L
;
TH
i
Þ
ð
Þ
P
n
where I is the sun-normalized radiance and P
n
is a polynomial of order n in
λ
whose
coef
fitting the logarithms of the normalized limb radiance in
the wavelength domain for each TH independently. Since the ozone absorption
signature is smaller compared to the whole Chappuis band, the in
cients are obtained by
uence of weaker
absorbers, namely, NO
2
and O
4
needs to be taken into account. The inversion
problem is solved then in a similar way as before (Rozanov et al.
2007
). The using
of DOAS-type retrieval may reduce the instrumental in
fl
uences by performing
polynomial calculation. This retrieval scheme is used to produce V3.0 limb ozone
pro
fl
les.
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