MLS V4

UARS MLS PARAMETER: HNO3

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: 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).

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.

These are spikes in the retrieved HNO3 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: 40471
Total records this month with MMAF_STAT = G/T/t and DQI = 4/2: 40643
Total records with MMAF_STAT = G/T/t and DQI = 4 with at least one spike greater than 5.0 sigma: 5 (fraction = 1.24e-04 )
Total records with MMAF_STAT = G/T/t and DQI = 4/2 with at least one spike greater than 5.0 sigma: 36 (fraction = 8.86e-04 )
Total records with MMAF_STAT = G/T/t and DQI = 4 with at least one spike greater than 4.0 sigma: 52 (fraction = 1.28e-03 )
Total records with MMAF_STAT = G/T/t and DQI = 4/2 with at least one spike greater than 4.0 sigma: 102 (fraction = 2.51e-03 )

P (hPa)	4.0 to 5.0 sigma	5.0 to 10 sigma	> 10 sigma	total

1.00	5	0	1	6
1.47	5	0	1	6
2.15	1	0	1	2
3.16	3	0	1	4
4.64	2	0	1	3
6.81	1	0	1	2
10	2	0	0	2
15	2	0	1	3
22	3	0	1	4
32	4	0	1	5
46	3	0	1	4
68	8	3	1	12
100	35	36	0	71

Day	Record	MMAF STAT	DQI	Lat	Lon	P (hPa)	HNO3 (ppbv)	UNCERT (ppbv)	sigma factor

21	772	G	2	14N	280	100	9.1	1.4	5.4
22	1000	G	2	4S	82	100	8.4	1.5	5.6
24	1037	G	2	8S	176	100	9.4	1.4	6.3
25	224	G	2	26S	307	100	7.7	1.5	5.7
26	210	G	2	19N	265	100	14.1	1.4	9.5
26	1047	G	2	7N	175	100	10.3	1.4	6.3
30	1231	G	2	2S	98	100	8.3	1.4	6.0
31	495	G	2	7S	179	100	9.6	1.4	6.4
31	750	G	2	22N	89	100	10.4	1.6	7.2
33	1112	G	2	9N	346	100	8.5	1.5	5.0
33	1236	G	2	10S	75	100	7.2	1.4	5.6
34	543	G	4	20N	282	100	7.9	1.5	5.4
35	942	G	2	5N	26	100	10.4	1.5	6.4
39	337	G	2	1S	178	100	11.4	1.4	8.2
39	900	G	2	4S	143	100	8.4	1.4	5.6
40	515	G	2	2N	121	100	9.6	1.3	6.9
40	997	G	2	15N	124	100	9.5	1.3	6.4
41	911	G	2	13N	141	100, 68	16.9, -5.2	1.3, 1.3	9.9, 6.1
42	383	G	2	8N	279	100	10.6	1.3	6.5
42	913	G	2	13N	136	100	14.7	1.2	8.6
44	920	G	2	18N	127	100	8.6	1.3	5.9
45	703	G	2	3N	44	100	8.7	1.4	6.2
47	707	G	2	8N	30	100	11.1	1.3	6.8
47	748	G	2	7N	153	100	10.2	1.3	6.3
48	1189	G	2	4N	24	100, 68	12.2, -4.2	1.4, 1.3	7.5, 5.2
49	132	T	2	6S	304	100	11.0	1.3	7.3
49	137	T	4	10N	314	100, 68, 46, 32, 22, 15, 6.81, 4.64, 3.16, 2.15, 1.47, 1.00	10.3, -9.5, -9.9, 31.6, -14.6, 24.9, 23.5, 32.4, 45.5, 55.9, 64.1, 68.4	1.3, 1.3, 1.5, 1.7, 2.0, 2.3, 2.4, 2.4, 2.6, 2.8, 3.2, 3.8	6.1, 10.4, 10.3, 15.7, 11.8, 10.2, 10.5, 14.4, 18.4, 19.2, 18.5, 17.5
49	270	T	2	12N	138	100	10.1	1.4	5.9
49	360	T	2	6N	117	100, 68	11.9, -4.2	1.4, 1.3	7.3, 5.2
49	713	T	2	3N	21	100	12.6	1.4	7.8
49	715	T	2	3S	25	100	13.0	1.3	8.6
49	845	T	2	21N	125	100	13.2	1.3	9.1
49	924	T	2	7S	84	100	8.4	1.4	5.6
50	667	G	2	6N	160	100	10.3	1.3	6.3
50	935	G	2	19N	93	100	8.6	1.3	5.9
51	988	G	2	15S	311	100	6.7	1.3	5.2