MIPAS QWG MEETING 14 Bologna Italy
Introduction
(Thorsten Fehr, ESA)
-No
major platform anomalies.
21 May 2007 some ground
segment anomalies (2.5 hours data loss)
24 Sept 2007 – 29
Sept 2007 Software anomaly (almost 5 days of data lost)
Mission
extended until 2010.
Clear the orbit.
Save fuel not controlling
the inclination. Mean local solar time variation up to 10 minutes (passing
between 21:50 and 22:10)
On
board processor anomaly, 02 May – 04 May 2007
Communication
area anomaly 20 July – 21 July 2007
Increase
duty cycle to 60% since April 2007
Since
08 June 2007 duty cycle increases to 80%
Mission
baseline: 3 days NOM + 1 day MA + 1 day UA + 3 days nom + 2 days off.
Mission
planning status (Marta de Laurentis proxy Fabrizio Niro, ESA)
Planning
of a 24h alternating rearward and backward measurements (starting around
November 2007).
Planning
a volcanic measurement scenario (to stay in latitude and longitude at a fixed
point for several scans)
The
volcanic eruption and terminator observations (same location at day and night)
modes need to be defined in the MIPAS Mission Plan document.
Aircraft
emission (AE) mode 9-10-11 September 2007
Future
Mission baseline
Summer time (1-20 July) 3days nom +2days NLC
+3days NOM + 2days off
Winter time (20-30 December) AE mode over north
Atlantic corridor
Data
acquisition status (Fabrizio Niro, ESA)
Availability
of the L0 Near Real Time (NRT) against planned products above 95%
L1
products availability against planned at D-Pac (oscillates between 80- 100%
since 2006)
Instrument
status (Peter Monser, Astrium)
Interferometer
anomalies have decrease
Cooler
operates rather stable
From
Quarter1 2006 the errors per day decreases from ~1.2 err/day to ~0.10 err/day
in Quarter3 2007.
Since
Sept 06 only one turn around failure was observed.
No
anomalies
Data
through the D-PAC server
Pointing
stable since correction in December 2003
The
levels of spikes is very low to affect the L1 quality
Cloud
flagging around 5km presents a high seasonal variation (a lot of clouds around
summer and few clouds in the winter). Also seen between 5km and 10km and clouds
between 10km to 15km
Old
O3 microwindows (MW): A bias up to 11% is observed in the altitude range
30-50km (tech note Y.j
Meijer)
Half of the bias is due to
the temperature
New
microwindows: The bias observed can be reduced substituting MW 332 with MW 343
LISA (Jean Marie Flaud)
MW
332 seems to be okay below 40-45 km.
Maybe
an effect of co2 (1033.49 and
1035.47) lines in the ozone retrieval above 52km
Also
there is a difference between the O3 retrieved with A band and the AB band. The
A band is inconsistent with the HIRTRAN database.
Comparison
between Mipas (Full resolution, FR and Reduce resolution, RR) and Gomos ozone
profiles
The
bias is within the systematic error (exception at 40hpa)
The
2005-2006 provides a better precision above 10hpa and a worse precision below
10 hpa wrt that of 2003-2004 dataset.
In
general, the quality of the ozone profiles retrieved from RR is comparable with
that obtained from the FR dataset.
John
Remedios
Clouds
affect the retrieval of h2o and ozone. Both molecules show an oscillatory
behaviour with behaviour at altitude above cloud anti correlacted with
behaviour at cloud altitude.
Validation
activity of RR measurements
Retrieving
1 point every 2 at low altitudes drastically reduces oscillations in CH4 and
N2O.
Michael
Hopfner
IMK
has a highest cloud index threshold, no real variation between the molecules.
Only
2 minor modifications to change
The spread error reduced
from 2 % to 0.2%
The gain error From 2% to
1%
Comparison
of OXF to ESA
Same MW but optimal
estimation algorithm
Structure in the O3
difference between ESA and MORSE. (probably because of Oxford retrieval problem
below the ozone peak)
CH4 and N2O clear spread
due to the oscillating profiles in the ESA retrieval
Long
terms
Temperature retrievals
stable from FR to RR (increase only of 1K at high altitudes)
H2O retrieval in the RR is
below that the FR
O3 increase of 5% due to MW
problem
HNO3 strong drop in the
southern pole
CH4 fairly stable
N2O going up in the RR
NO2 Antarctic winter increase
probably due to HNO3 lose.
Lower
mesospheric N2O (Manuel
Lopez-Puertas)
Change
in N2O in NH at night (Enhancement in N2O and in NO2 coincide in time)
The
source of N2O has to be linked to the N2O
NO2
+ N --ˆ N2O + O
ESA
has more realistic values in the N2O values at high altitudes comparing against
IMK/IAA possible due to the IMK/IAA regularization
The
origin of N2O is due to CH4
(transport from the tropics) and due to thermospheric source N2O (produced by
electron precipitation)
Short
term
Change MW for O3 retrieval
Change the vertical
resolution for the RR retrieval of CH4 and N2O
Middle
term
Auxiliary data files (ADF)
for the NRT data
Long
term
Change the L2 processor
Update
of the MIPAS handbook
Planning
a web page for the QWG with all the notes, structure, calendar, search tools,
discussion forum, etc.