DOI: 10.5194/tc-12-1331-2018
Scopus记录号: 2-s2.0-85045450151
论文题名: The color of melt ponds on Arctic sea ice
作者: Lu P ; , Leppäranta M ; , Cheng B ; , Li Z ; , Istomina L ; , Heygster G
刊名: Cryosphere
ISSN: 19940416
出版年: 2018
卷: 12, 期: 4 起始页码: 1331
结束页码: 1345
语种: 英语
英文关键词: absorption
; color
; ice thickness
; irradiance
; meltwater
; radiative transfer
; sea ice
; solar radiation
; upwelling
; wavelength
; Arctic
英文摘要: Pond color, which creates the visual appearance of melt ponds on Arctic sea ice in summer, is quantitatively investigated using a two-stream radiative transfer model for ponded sea ice. The upwelling irradiance from the pond surface is determined and then its spectrum is transformed into RGB (red, green, blue) color space using a colorimetric method. The dependence of pond color on various factors such as water and ice properties and incident solar radiation is investigated. The results reveal that increasing underlying ice thickness Hi enhances both the green and blue intensities of pond color, whereas the red intensity is mostly sensitive to Hi for thin ice (Hi <1.5 m) and to pond depth Hp for thick ice (Hi >1.5 m), similar to the behavior of meltpond albedo. The distribution of the incident solar spectrum F0 with wavelength affects the pond color rather than its intensity. The pond color changes from dark blue to brighter blue with increasing scattering in ice, and the influence of absorption in ice on pond color is limited. The pond color reproduced by the model agrees with field observations for Arctic sea ice in summer, which supports the validity of this study. More importantly, the pond color has been confirmed to contain information about meltwater and underlying ice, and therefore it can be used as an index to retrieve Hi and Hp. Retrievals of Hi for thin ice (Hi <1 m) agree better with field measurements than retrievals for thick ice, but those of Hp are not good. The analysis of pond color is a new potential method to obtain thin ice thickness in summer, although more validation data and improvements to the radiative transfer model will be needed in future. ©Atmospheric Measurement Techniques Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75377
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, China; Institute of Atmospheric and Earth Sciences, University of Helsinki, Helsinki, Finland; Finnish Meteorological Institute, Helsinki, Finland; Institute of Environmental Physics, University of Bremen, Bremen, Germany
Recommended Citation:
Lu P,, Leppäranta M,, Cheng B,et al. The color of melt ponds on Arctic sea ice[J]. Cryosphere,2018-01-01,12(4)