UARS MLS PARAMETER: SO2

UARS MONTH: 9108
UARS DAYS: 0016 - 0052 ( Sep. 27, 1991 - Nov. 2, 1991 )

• Inspection Date: 9-Jan-1997
  
  
• Quality Indicator for Month (QIM) [for v422 ] = A
  
  
• Further actions recommended: None.
  
  
• Comments: UARS days 16-19 were reserved for instrument characterization, so the days with useful atmospheric observations are from UARS day 20 (Oct. 1) on. UARS day 46 had scan problems and essentially no good atmospheric data (this had a small impact on day 47 also). UARS was in safehold during a small part of UARS day 51 and a significant part of UARS day 52, the latter day having no useful atmospheric data. Also, NCEP data were missing for UARS days 43 and 49 (this has a minor impact on MLS retrievals).
  
  Pinatubo residual SO2 is present in the equatorial regions and decaying daily.
  
  
• 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	215	117	2094	0	39850
  3	0	0	1	0	0	0	0
  2	0	0	3	0	2	0	20
  1	1893	0	0	0	0	0	0
  0	0	4579	1	4	0	0	1

• Number of spikes
• These are spikes in the retrieved SO2 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: 41944
• Total records this month with MMAF_STAT = G/T/t and DQI = 4/2: 41966
• Total records with MMAF_STAT = G/T/t and DQI = 4 with at least one spike greater than 4 sigma: 25 (fraction = 5.96e-04 )
• Total records with MMAF_STAT = G/T/t and DQI = 4/2 with at least one spike greater than 4 sigma: 26 (fraction = 6.20e-04 )
• Total records with MMAF_STAT = G/T/t and DQI = 4 with at least one spike greater than 3 sigma: 588 (fraction = 1.40e-02 )
• Total records with MMAF_STAT = G/T/t and DQI = 4/2 with at least one spike greater than 3 sigma: 589 (fraction = 1.40e-02 )




P (hPa)	3 to 4 sigma	4 to 10 sigma	> 10 sigma	total
5	121	1	0	122
10	121	4	0	125
22	130	5	0	135
46	127	3	0	130
100	117	14	0	131



• Records with spikes > 4 sigma




Day	Record	MMAF STAT	DQI	Lat	Lon	P (hPa)	SO2 (ppbv)	UNCERT (ppbv)	sigma factor
16	439	G	4	50N	233	100,46	-17.9, 15.9	-8.5, 4.7	5.3, 4.3
19	593	G	4	21N	344	22	15.9	2.4	4.9
21	628	G	4	51N	155	10	8.3	2.0	4.0
24	26	G	4	29N	321	22	15.0	2.3	5.0
24	722	G	4	58N	109	100	14.4	-8.4	4.1
25	802	G	4	77N	317	10	-9.3	2.0	4.4
26	210	G	4	19N	265	100	19.0	-8.5	5.9
26	413	G	4	33S	296	22	14.0	2.4	4.3
27	320	G	4	31S	282	100	14.6	-8.5	4.3
29	237	G	4	31S	296	10	10.4	2.0	4.2
30	3	G	4	13N	88	100	16.8	-8.6	5.1
30	246	G	4	34S	315	10	9.9	2.1	4.0
31	750	G	4	22N	89	100	15.3	-8.6	4.7
31	967	G	4	7S	162	100	14.1	-8.6	4.1
32	641	G	4	70N	305	100	-13.8	-8.4	4.2
37	559	G	4	48N	280	100	14.5	-8.3	4.0
39	598	G	4	9N	99	46	16.4	4.3	4.2
41	514	G	4	14N	109	100	13.6	-8.5	4.1
41	911	G	4	13N	141	100	20.1	-8.6	6.1
42	913	G	4	13N	136	100	17.4	-8.6	5.3
45	688	G	4	53N	17	22	11.0	2.1	4.1
47	838	G	4	13N	132	22	-5.7	2.5	4.2
49	137	T	2	10N	314	46	24.5	5.0	6.4
49	715	T	4	3S	25	100	17.1	-8.6	5.1
50	166	G	4	74N	107	5	-7.7	1.7	4.1
50	742	G	4	27S	103	100	13.7	-8.3	4.0