# Presentation: 690923

## AVE Science Team Meeting

- MTP Measurements during the Aura Validation Field Campaigns
- MJ Mahoney
- JPL/Caltech
- CSC, Lanham-Seabrook, MD
- September 19-20, 2005

## Background

-  MTP data can be used to validate temperature profiles measured by MLS, TES and HIRDLS, and can also contribute to OMI validation.
-  MLS data is available for PAVE and HAVE-2; TES data, for PAVE; and HIRDLS data is not yet released.
-  Status of MTP data analysis:
- - Pre-AVE: Archived
- - PAVE: Archived, but making refinements
- - HAVE-2: Archived

## The Retrieval Challenge

-        2300 HAVE-2 Soundings                 4800 PAVE Soundings

## To minimize formal retrieval errors, we:

- Average of 166 soundings similar to YRB 2005.01.28 0000UT

-  Use RAOBs flown by as template profiles to select others that are needed to calculate a set of retrieval coefficients (RCs) for a statistical retrieval
-  Only accept RAOBs within some bias and rms of the template profile
-  Use an information-theory-based metric to determine which RC set best matches the measurements

## In Situ Temperature Calibration against Radiosondes

- HAVE-2: Tnav - Traob   =  +2.62 K +/- 0.57 K (N=55)                 Tmtp - Traob   =   0.00 K +/- 0.21 K (N=55)                  Tmms - Traob =  -0.16 K +/- 0.21 K (N=55)                  Tpt - Traob      =  -0.71 K +/- 0.22 K (N=55)

- PAVE:     Tnav - Traob   = +0.86 K +/- 0.16 K (N=84)

- Pre-AVE: Used PT temperature as there were not                                                                                                                                           .                sufficient radiosondes to calibrate against
- .                Ticosondes will be important for CR-AVE

*In Situ* Temperature Calibration against Radiosondes

- MTP temperature is calibrated to agree with RAOBs. When the outside air temperature is compared to RAOBs launched near the aircraft flight track, we find the following:

## MTP Accuracy Relative to Radiosondes

- PAVE - DC8

- HAVE2 - WB57

## Evaluating the Quality of MTP Retrievals

- An information-theory-based metric, called the MRI, is used to evaluate the quality of MTP retrievals. It varies from 0 to 2 with 0 being excellent, and 2 very poor. It is the last entry in the header line of MTP scans in an MP-file (see below), and it is also shown as a gray trace at the bottom of MTP temperature curtains (next slides).

-      UT  NL      Zp Pitch  Roll   OAT   Zt1   Zt2  THt1  THt2     Lat      Lon   Hdg   MRI
-  91231  33  11.883   2.5  -4.9 219.6  11.2  99.9 340.4 999.9  33.840 -116.368  -0.8  0.44

-     Zp     T Err    Zg    ND
-  29886 235.0 2.1 29846   367
-  26384 224.5 1.9 26253   654
-  23284 217.1 1.9 23151  1091
-  20884 214.2 1.7 20775  1609
-  18784 211.5 1.6 18707  2269
-  17084 210.3 1.5 17046  2983
-  15884 212.4 1.5 15870  3569
-  15084 214.8 1.3 15079  4004
-  14384 217.0 1.2 14379  4426
-  13884 218.4 1.1 13874  4759
-  13484 219.2 1.1 13469  5048
-  13183 219.8 1.0 13164  5280
-  12883 219.9 0.9 12858  5532
-  12583 219.7 0.8 12553  5807
-  12383 219.4 0.7 12349  6000
-  12184 219.3 0.6 12146  6196
-  12034 219.3 0.3 11994  6343
-  11883 219.5 0.2 11841  6488

## PAVE Flight of January 27, 2005

- The DC-8 flew from Portsmouth, NH, to Resolute, NT. The polar vortex extended to southern Canada. The tropopause (white) increased flying north, and this was reproduced when flying back south.

## PAVE Flight of January 31, 2005

## Summary

-  MTP data has been archived for three AVE campaigns (pre-AVE, PAVE, and HAVE-2)
-  Work is continuing to improve the PAVE retrievals
-  We have begun to work with the MLS, TES temperature validation leads, and will work with the HIRDLS team when their data are released
-  More information is available at the MTP web site. URL: http://mtp.jpl.nasa.gov