Impact of a Surface Ice Lid on the Optical Properties of Melt Ponds
Impact of a Surface Ice Lid on the Optical Properties of Melt Ponds
复制标题
表面冰盖对熔池光学特性的影响
DOI：
10.1029/2018jc014161
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发表时间：
2018-11
期刊：
影响因子：
--
通讯作者：
Li Zhijun
中科院分区：
文献类型：
--
作者：
Lu Peng;Cao Xiaowei;Wang Qingkai;Leppäranta Matti;Cheng Bin;Li Zhijun
To investigate the influence of a surface ice lid on the optical properties of a melt pond, a radiative transfer model was employed that includes four plane-parallel layers: an ice lid, a melt pond, the underlying ice, and the ocean beneath the ice. The thickness Hs and the scattering coefficient σs of the ice lid are altered. Variations in the spectral albedo αλ and transmittance Tλ due to Hs for a transparent ice lid are limited, and scattering in the ice lid has a pronounced impact on the albedo of melt ponds as well as the vertical distribution of spectral irradiance in ponded sea ice. The thickness of the ice lid determines the amount of solar energy absorbed. A 2-cm-thick ice lid can absorb 13% of the incident solar energy, half of the energy absorbed by a 30-cm-deep meltwater layer below the lid. This has an influence on the thermodynamics of melting sea ice. The color and spectral albedo of refreezing melt ponds depend on the value of the dimensionless number σs·Hs. Good agreement between field measurements and our model simulations is found. The number σs·Hs is confirmed to be a good index showing that the influence of an ice lid with σs·Hs < 0.5 is negligible. This criterion can be easily performed during field observations through visually judging whether the ice lid has significantly changed the color of liquid melt ponds or not. Plain Language Summary Melt ponds are pools of open water that form on sea ice in the warm months of the Arctic Ocean, and they will frequently be refrozen due to loss of heat and then covered by an ice lid or snow even in summer. This lid is very important to the optical properties of melt ponds. If the ice lid is very thin, the change in the reflective characteristics of the melt pond is minimal; that is, the influence of the ice lid is negligible. If snow accumulates on the ice lid, the reflective characteristics of the melt pond change completely. How about the situation between the above two extreme cases? In this study, we find that a dimensionless number is a good index to quantify the impact of the ice lid. Visual inspections on the color of refreezing melt ponds also help to judge the significance of the influence of the ice lid. This will allow for an accurate estimation on the role of surface ice lid during field investigations on the optical properties of melt ponds.
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影响因子：
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DOI：
10.1002/0470024275
发表时间：
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期刊：
--
影响因子：
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