Oxford MIPAS meeting#91
21 Feb 06

Present

• Oxford: Anu Dudhia, Alastair Burgess, Jane Hurley, Joanne Walker, Claire Waymark.
• RAL: Alison Waterfall.

Instrument Status [Prev] [Next]

Functioning normally as far as we know, currently switched on for 4-5 orbits per day.

January monthly report is here.

• Some details on the Envisat Web-Site including Instrument Availability web-site
• Latest version of Mission Planning Document covering 1 Jan 06 to 05 Mar 06: [.xls] [.html].

L1 Data [Prev] [Next]

First arrival of routinely processed L1B (Reduced resolution), from measurements taken on 4th January 2006 (see mission planning, above, for measurement details).

FTP site is currently down (ftp-ops.de.envisat.esa.int).

Files so far (to see a map of coverage click here):

• MIP_NL__1PPDPA20060104_005723_000054992044_00017_20111_0013.N1
• MIP_NL__1PPDPA20060104_022952_000060302044_00018_20112_0012.N1
• MIP_NL__1PPDPA20060104_041028_000060302044_00019_20113_0008.N1
• MIP_NL__1PPDPA20060104_055104_000060302044_00020_20114_0004.N1
• MIP_NL__1PPDPA20060104_073140_000060302044_00021_20115_0003.N1
• MIP_NL__1PPDPA20060104_091216_000060302044_00022_20116_0001.N1
• MIP_NL__1PPDPA20060104_105252_000060302044_00023_20117_0007.N1
• MIP_NL__1PPDPA20060104_123328_000060302044_00024_20118_0009.N1
• MIP_NL__1PPDPA20060104_141403_000060302044_00025_20119_0006.N1
• MIP_NL__1PPDPA20060104_155439_000060302044_00026_20120_0005.N1
• MIP_NL__1PPDPA20060104_173515_000060302044_00027_20121_0011.N1
• MIP_NL__1PPDPA20060104_191552_000060302044_00028_20122_0002.N1
• MIP_NL__1PPDPA20060104_205627_000060302044_00029_20123_0000.N1
• MIP_NL__1PPDPA20060104_223703_000060302044_00030_20124_0010.N1

HiRDLS Comparisons (CW) [Prev] [Next]

Nearly completed the three types of comparisons (1: integrated radiances of coincident spectral regions. 2: Level 2 products for regions where there is some spectral overlap. 3: RFM simulating radiances based on MIPAS L2 where the HiRDLS channels are outside the MIPAS range.)

Problem that existed with simulating the long wavelength channel was due to using the wrong spectral database.

Currently examining average profiles across three latitude bands and using the RFM to compare these to HiRDLS observations.

2RR Microwindows (ie 0.0625cm^-1 resln) (AD) [Prev] [Next]

The extended set of MWs (11) are almost complete. Waiting on F11, F12, CO and HNO3 to converge.

For the pT retrieval, the low altitude error is limited by the random error component due to the oversampling. For the 1.5km vertical spacing, the error is around 5K. As a result some form of regularisation (least squares method) will be required. The prior information used in MORSE will have a similar, beneficial effect.

NOx (JW) [Prev] [Next]

Some N2O5 profiles are unstable, but correlated with high aerosol. Consider changing the aerosol uncertainty.

Plots showing a (small) increase in the N2O5 VMR with time after sunset can be found [here].

SF6 Retrievals (AB) [Prev]

GRL paper on SF6 Zonal means / seasonal variability accepted.

CFC (F11,F12) Retrievals & Trends (AB) [Next]

Started determining the VMRs and volume-weighted masses of F11 and F12 for 5-10 degree latitude bands over the length of the MIPAS mission. Aim is to determine the trend over 4 years (if any) inline with treaty reductions in their emission.

O3 validation vs GOME (AW) [Prev] [Next]

O3 comparisons vs GOME data. MIPAS results degraded to the lower GOME resolution using GOME AKs. GOME seems to give greater VMRs than MIPAS for equivalent measurements.

L2 validation (AB) [Prev] [Next]

Working on updates to the routine monitoring of L2 data. Recalculating the residuals, OM stats, etc. for v4.61 and v4.62 ESA L2. See [here] (updates still in progress).

ABB Feb 06