气候变化领域集成服务门户(CCPortal): The color of melt ponds on Arctic sea ice

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DOI	10.5194/tc-12-1331-2018
	The color of melt ponds on Arctic sea ice
	Lu P.; Leppäranta M.; Cheng B.; Li Z.; Istomina L.; Heygster G.
发表日期	2018
ISSN	19940416
卷号	12 期号:4
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
学科领域	absorption; color; ice thickness; irradiance; meltwater; radiative transfer; sea ice; solar radiation; upwelling; wavelength; Arctic
语种	英语
scopus关键词	absorption; color; ice thickness; irradiance; meltwater; radiative transfer; sea ice; solar radiation; upwelling; wavelength; Arctic
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/119178
作者单位	State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, 116024, China; Institute of Atmospheric and Earth Sciences, University of Helsinki, Helsinki, 00014, Finland; Finnish Meteorological Institute, Helsinki, 00101, Finland; Institute of Environmental Physics, University of Bremen, Bremen, 28359, Germany
推荐引用方式 GB/T 7714	Lu P.,Leppäranta M.,Cheng B.,et al. The color of melt ponds on Arctic sea ice[J],2018,12(4).
APA	Lu P.,Leppäranta M.,Cheng B.,Li Z.,Istomina L.,&Heygster G..(2018).The color of melt ponds on Arctic sea ice.Cryosphere,12(4).
MLA	Lu P.,et al."The color of melt ponds on Arctic sea ice".Cryosphere 12.4(2018).