Potential Source Regions and Transportation Pathways of Reactive Gases at a Regional Background Site in Northwestern China

Table 2

Seasonal statistical analysis results of various trajectories in Akedala.

Season	Clusters	The number of all trajectories	The percentage of all trajectories (%)	Mean mixing ratios and standard deviation of O3 (ppb)	Mean mixing ratios and standard deviation of CO (ppb)	Mean mixing ratios and standard deviation of NO2 (ppb)	Mean mixing ratios and standard deviation of SO2 (ppb)
Autumn	1	213	9.75	22.51 ± 10.79	105.13 ± 37.31	4.22 ± 1.07	4.53 ± 0.80
	2	546	25	24.41 ± 9.26	101.73 ± 34.15	4.06 ± 0.81	4.42 ± 0.57
	3	171	7.83	19.54 ± 6.60	104.40 ± 38.23	4.23 ± 1.03	4.26 ± 0.29
	4	787	36.03	24.84 ± 10.70	99.72 ± 38.86	3.97 ± 0.87	4.35 ± 0.51
	5	295	13.51	22.30 ± 10.75	103.87 ± 41.84	4.11 ± 1.03	4.36 ± 0.45
	6	172	7.88	21.39 ± 7.91	101.97 ± 37.33	4.42 ± 1.41	5.02 ± 1.22
Winter	1	342	15.83	24.24 ± 9.61	217.89 ± 104.70	3.82 ± 0.82	5.63 ± 2.00
	2	522	24.17	31.24 ± 11.90	251.72 ± 122.13	4.26 ± 1.11	5.10 ± 1.16
	3	293	13.56	30.47 ± 7.99	173.72 ± 92.04	3.59 ± 0.77	4.67 ± 1.26
	4	150	6.94	24.11 ± 10.09	173.65 ± 67.73	3.62 ± 0.47	5.14 ± 1.28
	5	429	19.86	24.46 ± 9.12	183.06 ± 73.33	3.95 ± 0.71	5.17 ± 1.31
	6	424	19.63	25.52 ± 10.75	196.41 ± 91.10	4.13 ± 0.83	5.11 ± 1.10
Spring	1	71	3.22	32.70 ± 10.19	104.54 ± 23.80	4.00 ± 0.53	4.30 ± 0.70
	2	860	38.95	34.98 ± 9.61	109.00 ± 35.03	4.25 ± 0.79	4.40 ± 0.45
	3	298	13.50	32.72 ± 10.65	109.36 ± 32.87	4.16 ± 0.65	4.39 ± 0.28
	4	329	14.90	33.12 ± 11.07	110.98 ± 38.44	4.09 ± 0.68	4.40 ± 0.53
	5	440	19.93	36.25 ± 7.59	99.14 ± 30.21	3.83 ± 0.72	4.26 ± 0.50
	6	210	9.51	36.22 ± 12.82	109.43 ± 39.14	4.04 ± 0.72	4.44 ± 0.77
Summer	1	942	42.66	33.50 ± 11.36	86.66 ± 27.26	3.01 ± 0.83	4.42 ± 0.46
	2	94	4.26	32.92 ± 10.31	87.46 ± 23.92	2.92 ± 0.64	4.70 ± 0.48
	3	348	15.76	30.85 ± 8.90	93.67 ± 32.54	3.28 ± 0.75	4.46 ± 0.44
	4	210	9.51	32.23 ± 12.40	77.96 ± 32.59	2.78 ± 0.85	4.49 ± 0.55
	5	483	21.88	35.22 ± 11.23	85.63 ± 32.61	3.12 ± 0.89	4.49 ± 0.65
	6	131	5.93	36.23 ± 11.42	86.83 ± 34.41	2.28 ± 1.05	4.40 ± 0.38