(OAD) Document for Ozone Mapping and Profiler Suite ... - NASA

OAD – OMPS TC EDR D37031
Rev C5
Page 20
3) Call ozmix to determine select mixing fraction between low- and mid- or mid- and
high-latitude profiles.
Subroutines called by ozone:
ozmix
For somega � 1.5, mix �s to get � using the latitude mixing fraction, fm:
� mix � ( 1 � f m ) � � prf 1 � f m � � prf 2
where prf1 and prf2 are low- and mid- or mid- and high-latitude profiles, respectively,
and
fm = 0 for |lat| � 15�,
fm = (|lat|-15)/30 for 15� < |lat| < 45�,
fm = (|lat|-45)/30 for 45� < |lat| < 75�, and
fm = 1 for |lat| �75�.
For somega > 1.5 AND R336-377 > 1, use the following procedure:
1) For each triplet chosen in subroutine ozone, use a 4 th wavelength that is sensitive to
ozone profile shape to select mixing fraction between low- and mid- or mid- and highlatitude
profiles. For example, if the optical path length of the measurement is 1.7, the 3
triplets chosen in subroutine ozone are formed by using one of the 4 reflectivity
wavelengths with the 312.5/321.0, 314.0/321.0, and 318.0/336.0 nm pairs. For these 3
triplets, the 308.5 nm wavelength is used to select ozone profile shape.
2) Calculate a residue for the 4 th wavelength, r4.
3) For each of the two profile sets, calculate the “triplet residue”:
r
trip
� r
4
� r
2
�4
� �R
��
� �
where r2 is the middle wavelength of the wavelength triplet.
4) Calculate the mixing fraction:
f
m
�
r
5) Calculate ozone using this mixing fraction:
and readjust residues
�
mix
�
trip
2
rtrip
( lower)
( lower)
� r ( higher)
trip
( 1 � f m ) � � prf 1 � f m � � prf 2
�r � 1 � f ) � r � f �� ( � � � ��
r � prf 1 ( m prf m mix 0 )
6) Recalculate rtrip. If it is greater than 0.1, iterate once using �mix determined in 4 above.
�mix corresponds to the heritage V7 ozone amount, �V7.
R