| 海冰对北极海冰边缘区大洋光学观测的影响评估 |
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| 作者姓名： | LI Tao ZHAO Jinping |
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| 基金项目： | The National Natural Science Foundation of China under contract No. 41206174; China Postdoctoral Science Foundation under contract No. 2012M511546; the Chinese Polar Scinece Strategy Fund under contract No. 20110204. |
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| 摘 要： | Diffuse attenuation coefficient(DAC) of sea water is an important parameter in ocean thermodynamics and biology, reflecting the absorption capability of sea water in different layers. In the Arctic Ocean, however, sea ice affects the radiance/irradiance measurements of upper ocean, which results in obvious errors in the DAC calculation. To better understand the impacts of sea ice on the ocean optics observations, a series of in situ experiments were carried out in the summer of 2009 in the southern Beaufort Sea. Observational results show that the profiles of spectral diffuse attenuation coefficients of seawater near ice cover within upper surface of 50 m were not contaminated by the sea ice with a solar zenith angle of 55°, relative azimuth angle of 110°≤φ≤115° and horizontal distance between the sensors and ice edge of greater than 25 m. Based on geometric optics theory, the impact of ice cover could be avoided by adjusting the relative solar azimuth angle in a particular distance between the instrument and ice. Under an overcast sky, ice cover being 25 m away from sensors did not affect the profiles of spectral DACs within the upper 50 m either. Moreover, reliable spectral DACs of seawater could be obtained with sensors completely covered by sea ice.
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| 关 键 词： | 海洋热力学 光学观测 海冰 影响评估 边缘区 北极 几何光学理论 衰减系数 |
| 收稿时间： | 2013/6/18 0:00:00 |
| 修稿时间： | 6/3/2014 12:00:00 AM |
An impact assessment of sea ice on ocean optics observations in the marginal ice zone of the Arctic |
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| LI Tao,ZHAO Jinping.An impact assessment of sea ice on ocean optics observations in the marginal ice zone of the Arctic[J].Acta Oceanologica Sinica,2014,33(12):24-31. |
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| Authors: | LI Tao and ZHAO Jinping |
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| Institution: | 1.Ocean University of China, Qingdao 266100, China2.Ocean University of China, Qingdao 266100, China;Physical Oceanography Laboratory, Ocean University of China, Qingdao 266100, China |
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| Abstract: | Diffuse attenuation coefficient (DAC) of sea water is an important parameter in ocean thermodynamics and biology, reflecting the absorption capability of sea water in different layers. In the Arctic Ocean, however, sea ice affects the radiance/irradiance measurements of upper ocean, which results in obvious errors in the DAC calculation. To better understand the impacts of sea ice on the ocean optics observations, a series of in situ experiments were carried out in the summer of 2009 in the southern Beaufort Sea. Observational results show that the profiles of spectral diffuse attenuation coefficients of seawater near ice cover within upper surface of 50 m were not contaminated by the sea ice with a solar zenith angle of 55°, relative azimuth angle of 110°≤φ≤115° and horizontal distance between the sensors and ice edge of greater than 25 m. Based on geometric optics theory, the impact of ice cover could be avoided by adjusting the relative solar azimuth angle in a particular distance between the instrument and ice. Under an overcast sky, ice cover being 25 m away from sensors did not affect the profiles of spectral DACs within the upper 50 m either. Moreover, reliable spectral DACs of seawater could be obtained with sensors completely covered by sea ice. |
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| Keywords: | impact assessment optical observation ice edge Arctic Ocean |
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