mipas2d: nighttime-daytime cfc11 e. arnone, m. carlotti, e. papandrea, m. ridolfi dcfi, university...
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MIPAS2D: nighttime-daytime CFC11
E. Arnone, M. Carlotti, E. Papandrea, M. RidolfiDCFI, University of Bologna, Italy
B.M. DinelliISAC-CNR, Bologna, Italy
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ESRIN-ESA
Frascati, 4 December 2008
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Night-daytime differences in CFC11
IMK Nighttime-daytime “daily” mean CFC11 within latitude band 60S/40S
ACTION ITEM AI_L1_17.06
check Day/Night CFC-11 for the GMTR data
ISSUE: day-nighttime difference in CFC11 of the order of 10% in IMK data (Stiller QWG17)
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MIPAS2D: night-daytime differences in CFC11
Nighttime-daytime “daily” mean CFC11 within latitude band 60S/40S
a) Left: Oxford
b) Right: IMK
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MIPAS2D: night-daytime differences in CFC11
Nighttime-daytime “daily” mean CFC11 within latitude band 60S/40S
a) Left: MIPAS2D (about 5000 orbits)
b) Right: IMK
Note that roughly the same colourbar is applied to the two figures.
MIPAS2D: night-daytime differences in CFC11
Dec 2002 Jul 2003 Dec 2003
Dec 2002 Jul 2003 Dec 2003
IMK night-daytime CFC11
NP SP NP NP SP NP NP SP NP 280
150
Tem
perature (K)
MIPAS2D: night-daytime differences in CFC11
Dec 2002 Jul 2003 Dec 2003
IMK night-daytime CFC11
2
-2
Temperature lat gradient (K/deg)Dec 2002 Jul 2003 Dec 2003
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T: Dec 2002 Jul 2003
Dec 2002 Jul 2003 Dec 2003
T_grad: Dec 2002 Jul 2003
The above analysis suggests that an inadequate modeling of the horizontal variability of temperature fields could explain the day-night differences observed in the IMK data as well as their reversal when changing season.
Conclusions
IMK
MIPAS2D
Oxford day-nighttime CFC11 (left) and HNO3 (right).
The opposite VMR vertical gradient induces a reversal of the day-nighttime difference.
HNO3 issue
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MIPAS2D: FR and RR
The DCFI-ISAC MIPAS2D database can be accessed via scp. For credentials, please send an e-mail to: [email protected].
Web: http://www.mbf.fci.unibo.it, http://www.isac.cnr.it/rss/mipas2d.htm
Time (years)Time (years)
Ozo
ne (
ppm
v)O
zone
(pp
mv)
Tem
pera
ture
(K
)T
empe
ratu
re (
K)
36 km36 km 52 km
North Pole
Equator
2002 2005 2008 2002 2005 2008
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MIPAS2D: night-daytime differences in F11
MIPAS2D nighttime-daytime “daily” mean F11 in latitude bands
a) Left: 60S/40S (equivalent to Stiller's example)
b) Centre:40S/40N
c) Right: 40N/60N
Results are obtained performing a weighted average, a 3-sigma clipping filtering and are then smoothed over a 3-day running box.
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MIPAS2D: night-daytime differences in F11
MIPAS2D daytime F11 “daily” standard deviation in latitude bands
a) Left: 60S/40S (Stiller's example band)
b) Centre:40S/40N
c) Right: 40N/60N
No significant difference with nighttime standard deviation (not shown).
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MIPAS2D: night-daytime differences in F11
MIPAS2D daytime F11 “daily” mean ESD in latitude bands
a) Left: 60S/40S (Stiller's example band)
b) Centre:40S/40N
c) Right: 40N/60N
No significant difference with nighttime mean ESD (not shown).
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MIPAS2D: night-daytime differences in F11
MIPAS2D number of daytime F11 measurements in latitude bands
a) Left: 60S/40S (Stiller's example band)
b) Centre:40S/40N
c) Right: 40N/60N
No significant difference with number of nighttime measurements (not shown).