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

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Article Navigation > Acta Oceanologica Sinica > 2014 > 33(12): 24-31

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. doi: 10.1007/s13131-014-0551-1

Citation:

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. 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

doi: 10.1007/s13131-014-0551-1

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

Received Date: 2013-06-18
Rev Recd Date: 2014-06-03

Abstract

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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References(15)

References

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