| ZHAO Jinping,LI Tao,EHN Jens,BARBER David. 2015. An analytical validation for the attenuation of lateral propagating light in sea ice. Acta Oceanologica Sinica, 34(3):1－8 |
| An analytical validation for the attenuation of lateral propagating light in sea ice |
| 海冰中侧向传播光衰减系数的解析验证 |
| Received:May 20, 2014 Revised:October 10, 2014 |
| DOI：10.1007/s13131-015-0628-5 |
| Key words:Arctic sea ice lateral propagating light optical attenuation coefficient artificial light analytical solution |
| 中文关键词: 北极 海冰 侧向传播光 光学衰减系数 人造光源 解析解 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | ZHAO Jinping | Physical Oceanography Laboratory, Ocean University of China, Qingdao 266100, China | jpzhao@ouc.edu.cn | | LI Tao | Physical Oceanography Laboratory, Ocean University of China, Qingdao 266100, China | | | EHN Jens | Centre for Earth Observation Science, University of Manitoba, Winnipeg R3T 2N2, Manitoba, Canada | | | BARBER David | Centre for Earth Observation Science, University of Manitoba, Winnipeg R3T 2N2, Manitoba, Canada | |
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| Abstract: |
| The attenuation of lateral propagating light (LPL) in sea ice was measured using an artificial light source in the Canadian Arctic during the 2007/2008 winter. The apparent attenuation coefficient μ(λ) for lateral propagating light was obtained from the measured logarithmic relative variation rate. In this study an analytical solution based on the strict optical theories is developed to validate the measured result. There is a good consistency between theoretical solution and measured data, by which a quite simple but very rigorous relationship among the light source, measurement geometry, and measured irradiance is established. The attenuation coefficients acquired by measurement and theory are the diffusion attenuation as an apparent optical property of ice, independent of the light source and shining condition. The attenuation ability of sea ice should be caused by the microstructure of sea ice, such as crystal size, ice density, brine volume, air inclusion, etc. It also includes the leak from both interfaces by directional scattering. It is verified that the measuring approach is operational and accurate to measure the attenuation of the LPL. The solution from this study did not tell the connection among the extinction and the inclusions of sea ice theoretically because of insufficient understanding. |
| 中文摘要: |
| 在2007/2008年冬季加拿大北极航次中,用人造光源测量了海冰中侧向传播光的衰减特性(Zhao et al., 2010)。从实测的辐照度对数相对变化数据中获得了侧向传播光的表观侧向衰减系数μ(λ)。本项研究根据严格的光学理论,导出了一个关于侧向传播光衰减的解析解,用于印证观测结果。这个简单的解析解建立了光源、测量条件、以及辐照度之间严格的关系,理论解和观测数据之间有非常好的一致性。结果表明,由测量和理论所获得的侧向衰减系数属于漫衰减,是海冰的表观光学特性,与光源与照射条件无关。海冰对光的衰减能力是由海冰的微结构引起的,如:晶体大小、海冰密度、盐泡和气泡的体积等等。侧向衰减也包括通过散射从海冰上下表面漏出的光引起的衰减。结果进一步表明,关于侧向散射的测量方法是可行的,可以精确地测量侧向传播光的衰减。 |
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