An impact assessment of sea ice on ocean optics observations in the marginal ice zone of the Arctic

LI Tao; ZHAO Jinping

doi:10.1007/s13131-014-0551-1

海冰对北极海冰边缘区大洋光学观测的影响评估

doi: 10.1007/s13131-014-0551-1

LITao¹,
ZHAOJinping^2,

1.
Ocean University of China, Qingdao 266100, China
2.
Ocean University of China, Qingdao 266100, China;Physical Oceanography Laboratory, Ocean University of China, Qingdao 266100, China

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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出版历程
- 收稿日期: 2013-06-18
- 修回日期: 2014-06-03

An impact assessment of sea ice on ocean optics observations in the marginal ice zone of the Arctic

LI Tao¹,
ZHAO Jinping^2
,

1.
Ocean University of China, Qingdao 266100, China
2.
Ocean University of China, Qingdao 266100, China;Physical Oceanography Laboratory, Ocean University of China, Qingdao 266100, China

摘要

摘要: 海水的漫射衰减系数反映了其对太阳辐射的吸收能力,是海洋热学和生物学的重要参数.然而,在北冰洋,海冰覆盖对大洋光学观测产生一定的影响,导致计算而来的漫射衰减系数存在误差.为了更好的理解海冰对大洋光学观测的影响,作者于2009年夏季在波弗特海南部进行了一系列评估试验.结果显示,当太阳天顶角为55°,相对方位角为110-115°,传感器与冰边缘的水平距离为25m时,大洋表层50m之内的光学观测不会受到海冰的影响.依据几何光学理论,在晴空条件下,当传感器与冰边缘距离一定时,可以通过调整仪器相对于太阳的方位角来避免海冰的影响.阴天条件下,传感器距离海冰边缘25米时,表层50m之内的光学观测不会受到海冰的影响.如果海冰密集度较高,无法达到上述要求,可以将传感器完全浸没在海冰之下,也能获得较为可靠的海水漫射衰减系数.
- 影响评估 /
- 光学观测 /
- 海冰边缘 /
- 北冰洋
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.
- impact assessment /
- optical observation /
- ice edge /
- Arctic Ocean

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参考文献(15)

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文章访问数: 1163
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海冰对北极海冰边缘区大洋光学观测的影响评估

doi: 10.1007/s13131-014-0551-1

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An impact assessment of sea ice on ocean optics observations in the marginal ice zone of the Arctic

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