MERRA2 Data Lessons for next REANL: Difference between revisions

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* Aircraft observations. Prior to 20130731/00z our reanalysis data uses a table incompatible with the new NRL aircraft quality control. There was also a problem in the way the height (derived from pressure) was calculated in the earlier obs that would be flagged by NRLQC. One more issue is that our data is being written with +/-3 hour window and the QC would benefit from having observations beyond these limits (just as Profiler and AMDAR windows are larger). For the next reanalysis the aircraft observations should be replaced, preferably processed with a recent version of PREPDATA so that TAMDAR observations get tail number IDs. (Even if we don't use them we may want to look at them.) Alternatively we could try to rewrite the data we have with corrected ACARS heights, updated BUFR table, and possibly wider time windowing.

*A shift in RAOB T O-F bias @ 700 hPa was seen to occur in Nov 1991 and seemingly recover in later years. The only real signal to correlate was SSMI Wind Speeds over that month, which showed a reduction in O-F bias. Otherwise, no real obvious signal was seen, but further investigation is necessary. It may be worthwhile to consider this transition as a period of testing in the next reanalysis.

*A shift in RAOB T O-F bias @ 700 hPa was seen to occur in Nov 1991 and seemingly recover in later years. The only real signal to correlate was [https://gmao.gsfc.nasa.gov/intranet/science/gms/d5124_m2_jan91/TERRA_html/obs2html/Y1991/M11/conv/G48/d5124_m2_jan91.pseries.L1.1991110100-1991113018.png SSMI Wind Speeds] over that month, which showed a reduction in O-F bias. Otherwise, no real obvious signal was seen, but further investigation is necessary. It may be worthwhile to consider this transition as a period of testing in the next reanalysis.

**[[Media:Large.300_700_raobt_o-f_m2_vs_merra.png]]

**[[Media:Large.300_700_raobt_o-f_m2_vs_merra.1991-1992.png]]

**[[Media:Large.300_700_raobt_o-f_m2_vs_merra.2004-2008.png]]

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 * Aircraft observations.  Prior to 20130731/00z our reanalysis data uses a table incompatible with the new NRL aircraft quality control.  There was also a problem in the way the height (derived from pressure) was calculated in the earlier obs that would be flagged by NRLQC.  One more issue is that our data is being written with +/-3 hour window and the QC would benefit from having observations beyond these limits (just as Profiler and AMDAR windows are larger).  For the next reanalysis the aircraft observations should be replaced, preferably processed with a recent version of PREPDATA so that TAMDAR observations get tail number IDs. (Even if we don't use them we may want to look at them.)  Alternatively we could try to rewrite the data we have with corrected ACARS heights, updated BUFR table, and possibly wider time windowing.
-*A shift in RAOB T O-F bias @ 700 hPa was seen to occur in Nov 1991 and seemingly recover in later years.  The only real signal to correlate was SSMI Wind Speeds over that month, which showed a reduction in O-F bias.  Otherwise, no real obvious signal was seen, but further investigation is necessary.  It may be worthwhile to consider this transition as a period of testing in the next reanalysis.
+*A shift in RAOB T O-F bias @ 700 hPa was seen to occur in Nov 1991 and seemingly recover in later years.  The only real signal to correlate was [https://gmao.gsfc.nasa.gov/intranet/science/gms/d5124_m2_jan91/TERRA_html/obs2html/Y1991/M11/conv/G48/d5124_m2_jan91.pseries.L1.1991110100-1991113018.png SSMI Wind Speeds] over that month, which showed a reduction in O-F bias.  Otherwise, no real obvious signal was seen, but further investigation is necessary.  It may be worthwhile to consider this transition as a period of testing in the next reanalysis.
 **[[Media:Large.300_700_raobt_o-f_m2_vs_merra.png]]
 **[[Media:Large.300_700_raobt_o-f_m2_vs_merra.1991-1992.png]]
 **[[Media:Large.300_700_raobt_o-f_m2_vs_merra.2004-2008.png]]