UARS MLS PARAMETER: CH3CN

UARS MONTH: 9203
UARS DAYS: 0195 - 0232 ( 24 Mar 1992 - 30 Apr 1992 )

• File Creation Date: 29-Oct-2001         Spikecatcher revision date: 18-Oct-2001
  
  
• Quality Indicator for Month (QIM) [for v500 . dat_1 ] = A
  
  
• Further actions recommended: None.
  
  
• Comments: There was some moon interference (for space view calibration) on several records of UARS days 195 through 197 (and these records are flagged as bad). NCEP data (northern hemisphere) were missing for UARS day 208 (this has a minor impact on MLS retrievals). A UARS roll maneuver on UARS day 210 affected a significant part of that day's atmospheric data (flagged as non-good data).
  
  
• Number of records in each DQI and MMAF_STAT category
  • MMAF_STAT: G, good data; t, missing NCEP temperatures below 22 hPa; T, missing NCEP temperatures below 100 hPa; M, missing tangent points; P, pointing anomaly; S, scan anomaly; B, bad data.
  • DQI (Data Quality Indicator): 4, good radiance fit/good radiances; 3, good radiance fit/some bad radiances; 2, bad radiance fit/good radiances; 1, bad radiance fit/some bad radiances; 0, anomaly/no fit.
  
  

  Quality	MMAF STAT
  (ClO Band)	B	S	P	M	T	t	G
  4	0	0	0	0	538	0	45903
  3	0	0	0	0	0	0	2
  2	0	0	0	0	6	0	1261
  1	649	414	4	2	0	0	0
  0	0	0	0	0	0	0	0

• Number of spikes
• These are spikes in the retrieved CH3CN mixing ratios for records with MMAF_STAT = G/T/t and DQI = 4/2 (that is, good records with good radiances). Spikes are identified by comparison of their deviation from the monthly zonal mean with the rms variability (sigma) calculated in distinct 6 degree latitude bins.
  
• Total records this month with MMAF_STAT = G/T/t and DQI = 4: 46441
• Total records this month with MMAF_STAT = G/T/t and DQI = 4/2: 47708
• Total records with MMAF_STAT = G/T/t and DQI = 4 with at least one spike greater than 5.0 sigma: 1 (fraction = 2.15e-05 )
• Total records with MMAF_STAT = G/T/t and DQI = 4/2 with at least one spike greater than 5.0 sigma: 2 (fraction = 4.19e-05 )
• Total records with MMAF_STAT = G/T/t and DQI = 4 with at least one spike greater than 4.0 sigma: 43 (fraction = 9.26e-04 )
• Total records with MMAF_STAT = G/T/t and DQI = 4/2 with at least one spike greater than 4.0 sigma: 57 (fraction = 1.19e-03 )




P (hPa)	4.0 to 5.0 sigma	5.0 to 10 sigma	> 10 sigma	total
0.147	5	0	0	5
0.215	5	0	0	5
0.316	6	0	0	6
0.464	3	0	0	3
0.681	2	0	0	2
1.00	4	0	0	4
1.47	2	0	0	2
2.15	2	0	0	2
3.16	1	0	0	1
4.64	3	0	0	3
6.81	2	0	0	2
10	6	0	0	6
15	3	1	0	4
22	2	0	0	2
32	1	0	0	1
46	4	0	0	4
68	11	1	0	12
100	6	0	0	6



• Records with spikes > 5.0 sigma




Day	Record	MMAF STAT	DQI	Lat	Lon	P (hPa)	CH3CN (pptv)	UNCERT (pptv)	sigma factor
200	653	G	4	30S	329	15	-150.2	46.6	5.2
217	74	G	2	5N	22	68	-172.0	51.1	5.4