MTTA (Mesospheric Temperature Trend Assessment)

[Under IAGA /ICMA Working Group on Trends]

 

Path of Progress so far…….

  • Establishment: July 2000.

  • Scientific Achievement in one sentence:  

Review of all experimental and model results available up to 2002 from 16 different groups on Annual Temperature trend at mesosphere and mesopause region temperature. 

Review of Mesospheric Temperature Trends.                                                                               

Review of Geophysics, 41(4), 1-1 to 1-41, 1015, doi:10.1029/2002RG000121, 2003.               

Authors: Beig, G., P. Keckhut, R. P. Lowe, Ray Roble, M. G. Mlynczak, J. Scheer, V. Fomichev, D. Offermann, W.J.R. French, M. G. Shepherd, A. I. Semenov, E. E. Remsberg, C. Y. She, F. J. Lübken, J. Bremer, B. R. Clemesha, J. Stegman, F. Sigernes, and S. Fadnavis,

Request reprint :     pollution@tropmet.res.in  

  • Trend WG Publication: 

Mesospheric Temperature Trend Assessment 1. Present Status and Issues.  

Technical Report No. II-F (1) of Joint working group LT-TIME "Long-term Trends in the Ionosphere, Thermosphere and Mesosphere" of IAGA, ICMA and PS-MOS (SCOSTEP), 1-75, 2002.

Authors: Gufran Beig, P. Keckhut, G.E. Thomas, M. G. Mlynczak, A.I. Semenov, R.P. Lowe, F.J. Luebken, J. Bremer, G.B. Burns, E.E. Remsberg, C.Y. She, J. Stegman, D. Offermann, J. Scheer, S.P. Burton, M.G. Shepherd, C. Deehr, B.R. Clemesha, S. Fadanavis, M. Gadsden, J. Taubenheim

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  • Initial Agenda of MTTA (December 2000):

The work for the assessment of mesospheric and lower thermospheric temperature trend is undertaken by the Working Group on trends constituted under the auspices of IAGA, ICMA and SCOSTEP (PS-MOS). A trend panel has been constituted by above WG for this purpose to prepare the report with the cooperation of all the leading groups in this field. All contributing groups /scientists will be duly acknowledged as contributing authors in report. It is planned to take up the assessment work in three category for regions- (i) above the stratopause but below the mesopause, (ii) Mesopause and (iii) Above mesopause up to 120 km

     

a. First Order Executive Summary                                                                                                           

In the first phase, a brief report or a position document has to prepared ASAP, work for which is underway. I request you to be a part of it and kindly send details of your data to be included in this executive summary clearly addressing the following points:

  1. Details of observation (place, latitude, longitude and local time) and duration of available data sets.

  2. What techniques used for observation? In long term observations, modification of instrumentation is likely with time. Specify if it is done.

  3. Specify the Statistical Methods / Model used for regression /trend analysis and filters used. What periodicities / harmonics are prominently noticed for natural variations and how they are filtered? Special mention for Seasonal trend, solar activity, QBO, AO, SAO and episodic events like volcanic impacts, tides etc. How data are combined (into nightly / monthly / yearly averages)?

  4. Possible factors of errors /uncertainty/ and how they are shown in results - kindly specify clearly including that due of instrumental changes, tides, etc. -Very Important

  5. Latest results of your trend analysis? (In brief). Please answer the following: (a) What is the general trend (per decade) for heights 50-120 km? (Vertical profile if available) or whatever height available in this range (b) Do you see any seasonal /monthly trend? . Include figures for long term seasonal analysis and a time series for a few heights. (c) Kindly elaborate Mesopause trend separately.

  6. Possible scientific explanation in support of your trend results.

  7. Model results with above specifications are also welcome.

 

b. Detailed Assessment:                                                                                                                     

After completion of task (a), rigorous data analysis with a common statistical model for detailed assessment report would be taken up as per the above mentioned 3 categories.

Please send your feedback to -

Dr. Gufran Beig (beig@tropmet.res.in)

Indian Institute of tropical Meteorology, Pashan, PUNE-411 008, India