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MIPAS2D: nighttime-daytime CFC11 E. Arnone, M. Carlotti, E. Papandrea, M. Ridolfi DCFI, University of Bologna, Italy B.M. Dinelli ISAC-CNR, Bologna, Italy. EuroSprite2005. ESRIN-ESA Frascati, 4 December 2008. Night-daytime differences in CFC11. ACTION ITEM AI_L1_17.06

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MIPAS2D: nighttime-daytime CFC11

E. Arnone, M. Carlotti, E. Papandrea, M. Ridolfi

DCFI, University of Bologna, Italy

B.M. Dinelli

ISAC-CNR, Bologna, Italy

EuroSprite2005

ESRIN-ESA

Frascati, 4 December 2008


Night-daytime differences in CFC11

ACTION ITEMAI_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)

IMK Nighttime-daytime “daily” mean CFC11 within latitude band 60S/40S

EuroSprite2005


MIPAS2D: night-daytime differences in CFC11

EuroSprite2005

Nighttime-daytime “daily” mean CFC11 within latitude band 60S/40S

a) Left: Oxford

b) Right: IMK


MIPAS2D: night-daytime differences in CFC11

EuroSprite2005

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

IMK night-daytime CFC11

Dec 2002 Jul 2003 Dec 2003

NP SP NP

NP SP NP

NP SP NP

280

150

Temperature (K)‏

Dec 2002 Jul 2003 Dec 2003


MIPAS2D: night-daytime differences in CFC11

IMK night-daytime CFC11

Dec 2002 Jul 2003 Dec 2003

Temperature lat gradient (K/deg)‏

2

-2

Dec 2002 Jul 2003 Dec 2003


T: Dec 2002 Jul 2003

Dec 2002 Jul 2003 Dec 2003

EuroSprite2005

T_grad: Dec 2002 Jul 2003


Conclusions

IMK

MIPAS2D

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.


HNO3 issue

Oxford day-nighttime CFC11 (left) and HNO3 (right).

The opposite VMR vertical gradient induces a reversal of the day-nighttime difference.


MIPAS2D: FR and RR

36 km

36 km

52 km

Temperature (K)‏

Ozone (ppmv)‏

North Pole

Equator

Temperature (K)‏

Ozone (ppmv)‏

EuroSprite2005

2002 2005 2008

2002 2005 2008

Time (years)‏

Time (years)‏

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


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.

EuroSprite2005


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).

EuroSprite2005


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).

EuroSprite2005


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).

EuroSprite2005


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