Optical Depth Retrieval of Offshore Sea Nonspherical Aerosol Based on Airborne Multi-Angle Polarization Information

Rufang Ti; Xiaobing Sun; Shu Li; Zhenting Chen; Yanli Qiao

doi:10.3788/AOS201838.1201001

Acta Optica Sinica, Volume. 38, Issue 12, 1201001(2018)

Optical Depth Retrieval of Offshore Sea Nonspherical Aerosol Based on Airborne Multi-Angle Polarization Information

Rufang Ti^1,2、*, Xiaobing Sun^1、*, Shu Li¹, Zhenting Chen¹, and Yanli Qiao¹

¹ Key Laboratory of Optical Calibration and Characterization, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, Anhui 230031, China

² University of Chinese Academy of Sciences, Beijing 100049, China

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Figures & Tables(10)

Fig. 1. Phase functions and linear polarization degrees of ellipsoidal nonspherical particles with different aspect ratios in fine-mode state M4. (a) Prolate spheroid, F11; (b) prolate spheroid, -F12/F11; (c) oblate spheroid, F11; (d) oblate spheroid, -F12/F11

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Fig. 2. Phase functions and linear polarization degrees of ellipsoidal nonspherical particles with different aspect ratios in coarse-mode state M9. (a) Prolate spheroid, F11; (b) prolate spheroid, -F12/F11; (c) oblate spheroid, F11; (d) oblate spheroid, -F12/F11

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Fig. 3. Scattering matrix comparison of spherical particles and nonspherical particles with equal-probability ellipsoidal distribution in fine-mode state M4. (a) F11; (b) -F12/F11; (c) F22/F11; (d) F33/F11; (e) F34/F11; (f) F44/F11

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Fig. 4. Scattering matrix comparison of spherical particles and nonspherical particles with equal-probability ellipsoidal distribution in coarse-mode state M9. (a) F11; (b) -F12/F11; (c) F22/F11; (d) F33/F11; (e) F34/F11; (f) F44/F11

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Fig. 5. Polarized reflectance versus optical depth for spherical and nonspherical particles in different states. (a) Fine-mode state M4; (b) coarse-mode state M9

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Fig. 6. Flow chart of ocean aerosol retrieval

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Fig. 7. Retrieval results of optical depths of spherical and nonspherical aerosol particles. (a) Morning; (b) afternoon

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Fig. 8. Measured and simulated polarized reflectance for AMPR at 865 nm. (a) Morning; (b) afternoon

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Table 1. Main parameters for flight
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Table 1. Main parameters for flight
Time Altitude /km Solarzenith Scan angle Weather
2012-08-10T10:02-10:17 3.1 34.2°<θ_s<37.2° -38°<θ_scan<29° Clear, cloudless
2012-08-10T13:53-14:07 3.2 32.4°<θ_s<34.4° -38°<θ_scan<29° Clear, cloudless

Table 2. Average value and relative root-mean-square error of spherical and nonspherical aerosols

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Table 2. Average value and relative root-mean-square error of spherical and nonspherical aerosols

Time	Mode	Averaged AOD	M_{SE_}_τ	Static number
	Nonspheroid particle	0.1619	0.0887
Morning	Spherical particle	0.1432	0.1648	106
	CE318	0.1635		6
	Nonspheroid particle	0.0560	0.0557
Afternoon	Spherical particle	0.0517	0.1813	94
	CE318	0.0563		4

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Rufang Ti, Xiaobing Sun, Shu Li, Zhenting Chen, Yanli Qiao. Optical Depth Retrieval of Offshore Sea Nonspherical Aerosol Based on Airborne Multi-Angle Polarization Information[J]. Acta Optica Sinica, 2018, 38(12): 1201001

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