Field measurements of in-ice radiance

Citation
Ws. Pegau et Jrv. Zaneveld, Field measurements of in-ice radiance, COLD REG SC, 31(1), 2000, pp. 33-46
Citations number
30
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Civil Engineering
Journal title
COLD REGIONS SCIENCE AND TECHNOLOGY
ISSN journal
0165-232X → ACNP
Volume
31
Issue
1
Year of publication
2000
Pages
33 - 46
Database
ISI
SICI code
0165-232X(200002)31:1<33:FMOIR>2.0.ZU;2-I
Abstract
A new technique for measuring the light field within sea ice has been devel oped and deployed in first and multiyear ice. Portions of the radiance dist ribution are determined by profiling a 3 degrees field-of-view radiance hea d at a number of zenith and azimuth angles. Results from two sampling perio ds conducted in 1995 are presented. We find that the radiance distribution is not isotropic. The light field nearly reaches the asymptotic state withi n the first 0.25 m, but small-scale ice structure prevents the asymptotic s tate from being fully achieved. We use the nearly asymptotic radiance distr ibution to estimate the inherent optical properties of the ice and find fai r agreement with previously reported results. The spectral attenuation coef ficients derived from the radiance measurements are in good agreement with previously determined values. The influence of particulate inclusions on th e attenuation spectrum is also demonstrated. (C) 2000 Elsevier Science B.V. All rights reserved.