Title Attenuation of lateral propagating light in sea ice measured with an artificial lamp in winter Arctic
Author Zhao, J.P.; Li Tao; Barber, D.; Ren, J.P.; Pucko, M.; Li, S.J.; Li Xiang
Author Affil Zhao, J.P., Ocean University of China, Key Lab of Physical Oceanography, Qingdao, China. Other: University of Manitoba, Canada; Chinese Academy of Sciences, Institute of Oceanology, China
Source Cold Regions Science and Technology, 61(1), p.6-12, . Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0165- 232X
Publication Date Apr. 2010
Notes In English. Based on Publisher- supplied data GeoRef Acc. No: 309585
Index Terms attenuation; ice; light (visible radiation); measurement; salinity; depth; light; sea ice; wavelength
Abstract The attenuation property of a lateral propagating light (LPL) in sea ice was measured using an artificial lamp in the Canadian Arctic during the 2007/2008 winter. A measurement method is proposed and applied whereby a recording instrument is buried in the sea ice and an artificial lamp is moved across the instrument. The apparent attenuation coefficient (lambda ) for the lateral propagating light is obtained from the measured logarithmic relative variation rate. With the exception of blue and red lights, the attenuation coefficient changed little with wavelength, but changed considerably with depth. The vertical decrease of the attenuation coefficient was found to be correlated with salinity: the greater the salinity, the greater the attenuation coefficient. A clear linear relation of salinity and the lateral attenuation coefficient with R2=0.939 exists to address the close correlation of the attenuation of LPL with the scattering from the brine. The observed attenuation coefficient of LPL is much larger than that of the vertical propagation light, which we speculate to be caused by scattering. Part of this scattered component is transmitted out of the sea ice from the upper and lower surfaces.
URL http://hdl.handle.net/10.1016/j.coldregions.2009.12.006
Publication Type journal article
Record ID 65006523