Mass absorption indices of various types of natural aerosol particles in the infrared

Klaus Fischer

doi:10.1364/AO.14.002851

Applied Optics
Vol. 14,
Issue 12,
pp. 2851-2856
(1975)
•https://doi.org/10.1364/AO.14.002851

Mass absorption indices of various types of natural aerosol particles in the infrared

Klaus Fischer

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Klaus Fischer, "Mass absorption indices of various types of natural aerosol particles in the infrared," Appl. Opt. 14, 2851-2856 (1975)

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Abstract

The mass absorption index of aerosol particles has been measured in the 2–17-μm wavelength region. The measurements were performed on films of aerosol particles that were collected by an automatic jet impactor at polluted and various uncontaminated remote sites. All but marine aerosols possess strong absorption bands in the transparent part of the atmospheric long-wave spectrum, indicating marked influence of aerosol particles on the radiation budget of the atmosphere.

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	Marine	Marine/Contin. (Sahara dust over Atlantic)	Mountain (1200 m)	Urban (Mainz)
Decreasing humidity	2.35	2.53		2.68
			1.81
Increasing humidity	2.41	2.59		2.77

λ (μm)	k/ ρ (cm³/g)

	Urban^b (Mainz)	Marine^c (west coast of Ireland)	Marine/Cont.^c (west coast of Ireland)	Mountain (Jungfrau joch)	Desert (Negev)

					14–15 May 1973 (Sharav)	15–16 May 1973	18–24 May 1973
3	0.046	0.032	0.055	0.007	0.011	0.034	0.019
4	0.048	0.032	0.022	0.013	0.011	0.052	0.021
5	0.038	0.036	0.018	0.013	0.010	0.045	0.019
6	0.044	0.028	0.025	0.015	0.016	0.046	0.017
7	0.089	—	—	0.028	0.009	0.051	0.032
8	0.047	0.019	0.017	0.012	0.017	0.025	0.020
8.5	0.066	0.022	0.029	0.028	0.041	0.045	0.019
9	0.135	0.026	0.125	0.063	0.066	0.091	0.067
9.5	0.129	0.034	0.111	0.094	0.088	0.150	0.064
10	0.079	0.032	0.039	0.055	0.004	0.132	0.046
10.5	0.063	0.025	0.025	0.041	0.006	0.085	0.040
11	0.051	0.021	0.016	0.036	0.001	0.066	0.034
11.5	0.047	0.011	0.017	0.033	0.001	0.054	0.031
12	0.045	0.010	0.027	0.035	0.012	0.048	0.031
13	0.050	0.007	0.034	0.038	0.034	0.061	0.036
14	0.054	—	—	0.042	0.041	0.071	0.045
15	0.060	0.009	0.033	0.072	0.031	0.085	0.052
16	0.109	0.002	0.082	0.063	0.091	0.126	0.088
17	0.109	—	—	0:097	0.066	0.163	0.091

	Marine	Marine/Contin. (Sahara dust over Atlantic)	Mountain (1200 m)	Urban (Mainz)
Decreasing humidity	2.35	2.53		2.68
			1.81
Increasing humidity	2.41	2.59		2.77

λ (μm)	k/ ρ (cm³/g)

	Urban^b (Mainz)	Marine^c (west coast of Ireland)	Marine/Cont.^c (west coast of Ireland)	Mountain (Jungfrau joch)	Desert (Negev)

					14–15 May 1973 (Sharav)	15–16 May 1973	18–24 May 1973
3	0.046	0.032	0.055	0.007	0.011	0.034	0.019
4	0.048	0.032	0.022	0.013	0.011	0.052	0.021
5	0.038	0.036	0.018	0.013	0.010	0.045	0.019
6	0.044	0.028	0.025	0.015	0.016	0.046	0.017
7	0.089	—	—	0.028	0.009	0.051	0.032
8	0.047	0.019	0.017	0.012	0.017	0.025	0.020
8.5	0.066	0.022	0.029	0.028	0.041	0.045	0.019
9	0.135	0.026	0.125	0.063	0.066	0.091	0.067
9.5	0.129	0.034	0.111	0.094	0.088	0.150	0.064
10	0.079	0.032	0.039	0.055	0.004	0.132	0.046
10.5	0.063	0.025	0.025	0.041	0.006	0.085	0.040
11	0.051	0.021	0.016	0.036	0.001	0.066	0.034
11.5	0.047	0.011	0.017	0.033	0.001	0.054	0.031
12	0.045	0.010	0.027	0.035	0.012	0.048	0.031
13	0.050	0.007	0.034	0.038	0.034	0.061	0.036
14	0.054	—	—	0.042	0.041	0.071	0.045
15	0.060	0.009	0.033	0.072	0.031	0.085	0.052
16	0.109	0.002	0.082	0.063	0.091	0.126	0.088
17	0.109	—	—	0:097	0.066	0.163	0.091

Abstract

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Applied Optics