Some Measurements of the Attenuation of Solar Radiation During BOMEX

A. J. Drummond; G. D. Robinson

doi:10.1364/AO.13.000487

Applied Optics
Vol. 13,
Issue 3,
pp. 487-492
(1974)
•https://doi.org/10.1364/AO.13.000487

Some Measurements of the Attenuation of Solar Radiation During BOMEX

A. J. Drummond and G. D. Robinson

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A. J. Drummond and G. D. Robinson, "Some Measurements of the Attenuation of Solar Radiation During BOMEX," Appl. Opt. 13, 487-492 (1974)

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Abstract

Measurements of the upward and downward flux of solar radiation in two broad wavelength bands defined by glass filters were made at height between about 300 m and 12,000 m in the neighborhood of Barbados during the BOMEX experiment in the summer of 1969. These were examined on selected occasions, apparently cloudless, to determine the attenuation—absorption and upward scattering—that could not be attributed to atmospheric gases and must be considered to be caused by particles. Total particle absorption between the lowest and highest flight levels was found to be of order 5%, and upward scatter of order 1% of the incident radiation. Unexplained attenuation above the highest level was of order 2%. The attenuation attributed to particles was of approximately the same magnitude as the geometrical cross section deduced by direct particle sampling on the same flights. Unexplained attenuation above the highest flight level was not found in a series of similar flights in northern temperate latitudes. It is attributed to cirrus cloud in the high tropical troposphere not otherwise observed.

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			Quartz Filter		OG1 Filter		RG8 Filter

Date	Approx. Position	Layer (Kft)	Upward Scatter	Absorption	Upward Scatter	Absorption	Upward Scatter	Absorption
First Approximation (Hoelper)
13th 1500h	12N 55W	1–33	0.005	0.090			[−0.001]	0.031
20th 1430h	12N 60W	12–33	[−0.003]	0.014	[−0.009]	0.023
		7–12	[−0.004]	0.022	[−0.004]	0.011
		0.7–7	0.013	0.034	0.009	0.023
		0.7–33	0.006	0.070	[−0.004]	0.057
20th 1730	12N 59W	0.7–29	0.011	0.052	0.006	0.053
23rd 1500	10N 52 W	14–33	[−0.003]	0.003	0.001	0.005
		8–14	0.009	0.017	0.002	0.015
		1–8	[−0.001]	0.020	0.003	0.012
		1–33	0.005	0.040	0.006	0.032
Second Approximation (Yamamoto)
13th 1500		1–33	0.001	0.073			[−0.001]	0.014
20th 1430		12–33	[−0.001]	0.008	[−0.009]	0,016
		7–12	[−0.008]	0.028	[−0.005]	0.018
		0.7–7	0.012	0.015	0.009	0.004
		0.7–33	0.003	3.051	[−0.005]	0.038
20th 1730		0.7–29	0.011	0.041	+ 0.003	0.040
23rd 1500		14–33	0.002	[−0.001]	0.060	0.002
		8–14	0.013	0.016	0.003	0.014
		1–8	0.003	0.001	0.005	[−0.005]
		1–33	0.018	0.019	0.008	0.013

Date	Height (m)	sinh	Quartz	OG1	RG8
First Approximation (Hoelper)
23 July	12,000	0.76	0.028	0.028
14 July	12,000	0.60	0.043		0.021
13 July	10,000	0.96	0.077		0.054
20 July	10,000	0.96	0.034	0.023
23 July	10,000	0.97	0.026	0.025
14 July	9000	0.98	0.031		0.018
20 July	8800	0.88	0.026	0.019
Second Approximation (Yamamoto)
23 July	12,000	0.76	0.022	0.019
14 July	12,000	0.60	0.031		0.013
13 July	10,000	0.96	0.059		0.040
20 July	10,000	0.96	0.015	0.004
23 July	10,000	0.97	0.014	0.009
14 July	9000	0.98	0.021		0.005
20 July	8800	0.88	0.006	0.003

No.	Date	Filter	Fractional transmission	μm H₂O	μm H₂O, (Kuhn)
201	15 July 68	Quartz	0.954	25	16
		RG8	0.519	23
205	19 July 68	Quartz	0.954	25	11
		RG8	0.504	230
206	30 July 68	Quartz	0.947	120
		RG8	0.511	120
207	1 Aug. 68	Quartz	0.950	65
		OG1	0.702	12
208	2 Aug. 68	Quartz	0.951	55	45
		OG1	0.700	23
209	6 Aug. 68	Quartz	0.943	160
		RG2	0.578	85
210	7 Aug. 68	Quartz	0.940	200
		GG14	0.743	650

			Quartz Filter		OG1 Filter		RG8 Filter

Date	Approx. Position	Layer (Kft)	Upward Scatter	Absorption	Upward Scatter	Absorption	Upward Scatter	Absorption
First Approximation (Hoelper)
13th 1500h	12N 55W	1–33	0.005	0.090			[−0.001]	0.031
20th 1430h	12N 60W	12–33	[−0.003]	0.014	[−0.009]	0.023
		7–12	[−0.004]	0.022	[−0.004]	0.011
		0.7–7	0.013	0.034	0.009	0.023
		0.7–33	0.006	0.070	[−0.004]	0.057
20th 1730	12N 59W	0.7–29	0.011	0.052	0.006	0.053
23rd 1500	10N 52 W	14–33	[−0.003]	0.003	0.001	0.005
		8–14	0.009	0.017	0.002	0.015
		1–8	[−0.001]	0.020	0.003	0.012
		1–33	0.005	0.040	0.006	0.032
Second Approximation (Yamamoto)
13th 1500		1–33	0.001	0.073			[−0.001]	0.014
20th 1430		12–33	[−0.001]	0.008	[−0.009]	0,016
		7–12	[−0.008]	0.028	[−0.005]	0.018
		0.7–7	0.012	0.015	0.009	0.004
		0.7–33	0.003	3.051	[−0.005]	0.038
20th 1730		0.7–29	0.011	0.041	+ 0.003	0.040
23rd 1500		14–33	0.002	[−0.001]	0.060	0.002
		8–14	0.013	0.016	0.003	0.014
		1–8	0.003	0.001	0.005	[−0.005]
		1–33	0.018	0.019	0.008	0.013

Date	Height (m)	sinh	Quartz	OG1	RG8
First Approximation (Hoelper)
23 July	12,000	0.76	0.028	0.028
14 July	12,000	0.60	0.043		0.021
13 July	10,000	0.96	0.077		0.054
20 July	10,000	0.96	0.034	0.023
23 July	10,000	0.97	0.026	0.025
14 July	9000	0.98	0.031		0.018
20 July	8800	0.88	0.026	0.019
Second Approximation (Yamamoto)
23 July	12,000	0.76	0.022	0.019
14 July	12,000	0.60	0.031		0.013
13 July	10,000	0.96	0.059		0.040
20 July	10,000	0.96	0.015	0.004
23 July	10,000	0.97	0.014	0.009
14 July	9000	0.98	0.021		0.005
20 July	8800	0.88	0.006	0.003

Abstract

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Applied Optics