Advances in Meteorology

Research Article

Classifying Aerosols Based on Fuzzy Clustering and Their Optical and Microphysical Properties Study in Beijing, China

Table 2

Results of the fuzzy cluster analysis.


Properties		Cluster 1	Cluster 2	Cluster 3	Cluster 4	Cluster 5	Cluster 6

AOD	440 nm	1.25	1.56	0.79	0.76	0.73	0.87
	676 nm	0.77	0.94	0.45	0.43	0.44	0.64
	869 nm	0.54	0.66	0.31	0.31	0.33	0.55
	1020 nm	0.42	0.54	0.26	0.26	0.28	0.51

SSA	440 nm	0.95	0.90	0.90	0.84	0.88	0.89
	676 nm	0.96	0.92	0.91	0.87	0.91	0.94
	869 nm	0.95	0.91	0.90	0.85	0.90	0.95
	1020 nm	0.95	0.90	0.90	0.84	0.90	0.95

REFR	440 nm	1.44	1.50	1.43	1.48	1.51	1.50
	676 nm	1.44	1.51	1.46	1.51	1.53	1.53
	869 nm	1.44	1.52	1.47	1.52	1.54	1.53
	1020 nm	1.44	1.51	1.48	1.53	1.54	1.52

REFI	440 nm	0.007	0.015	0.012	0.023	0.014	0.007
	676 nm	0.005	0.009	0.008	0.014	0.008	0.003
	869 nm	0.005	0.009	0.008	0.015	0.008	0.003
	1020 nm	0.005	0.010	0.009	0.016	0.008	0.003

ASYM	440 nm	0.74	0.71	0.71	0.68	0.69	0.72
	676 nm	0.70	0.65	0.64	0.62	0.64	0.68
	869 nm	0.67	0.62	0.61	0.61	0.63	0.68
	1020 nm	0.65	0.62	0.61	0.61	0.63	0.69

VolConF (μm³/μm²)		0.16	0.17	0.11	0.09	0.08	0.07
VolMedianRadF (μm)		0.26	0.21	0.17	0.16	0.16	0.15
StdDevF		0.57	0.54	0.50	0.51	0.48	0.52
VolConC (μm³/μm²)		0.09	0.18	0.11	0.11	0.16	0.35
VolMedianRadC (μm)		2.94	2.60	2.73	2.79	2.71	2.35
StdDevC		0.55	0.57	0.60	0.63	0.65	0.60
FFV		0.64	0.49	0.50	0.45	0.33	0.17
SP (%)		52.32	57.83	58.28	64.27	28.99	6.51
WV (g/cm²)		2.18	1.13	1.34	0.64	0.91	0.91
Number of records		917	1124	1188	1252	1394	857
Percentage to total number (%)		13.6	16.7	17.6	18.6	20.7	12.7