Impact of a Surface Ice Lid on the Optical Properties of Melt Ponds
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 H-s and the scattering coefficient s...
Published in: | Journal of Geophysical Research: Oceans |
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/301858 2024-01-07T09:38:03+01:00 Impact of a Surface Ice Lid on the Optical Properties of Melt Ponds Lu, P. Cao, X. Wang, Q. Leppäranta, M. Cheng, B. Li, Z. Institute for Atmospheric and Earth System Research (INAR) INAR Physics 2019-05-18T21:46:57Z 16 application/pdf http://hdl.handle.net/10138/301858 eng eng American Geophysical Union 10.1029/2018JC014161 This research was supported by the National Key Research and Development Program of China (2016YFC1402702), the Global Change Research Programme of China (2015CB953901), and the National Natural Science Foundation of China (41676187). M. L. was supported by the collaborative program of Academy of Finland and Chinese Academy of Sciences. B. C. was supported by the NSFC research facility mobility (41428603) and Academy of Finland (317999). The field observation data used are listed in the references. Natasche Oppelt and an anonymous reviewer are also acknowledged for their constructive comments that highly improved the manuscript. Lu , P , Cao , X , Wang , Q , Leppäranta , M , Cheng , B & Li , Z 2018 , ' Impact of a Surface Ice Lid on the Optical Properties of Melt Ponds ' , Journal of Geophysical Research : Oceans , vol. 123 , no. 11 , pp. 8313-8328 . https://doi.org/10.1029/2018JC014161 85056718750 1c94bd8e-ca5d-4ef5-a0db-d2298d94ae04 http://hdl.handle.net/10138/301858 000453907000035 unspecified openAccess info:eu-repo/semantics/openAccess melt ponds Arctic sea ice radiative transfer refreezing numerical simulation ARCTIC SEA-ICE RADIATIVE-TRANSFER MONTE-CARLO BALANCE ALBEDO ENERGY WATER TRANSMISSION VALIDATION EVOLUTION 1172 Environmental sciences Article publishedVersion 2019 ftunivhelsihelda 2023-12-14T00:04:56Z 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 H-s and the scattering coefficient sigma(s) of the ice lid are altered. Variations in the spectral albedo and transmittance T due to H-s 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 sigma(s) H- s. Good agreement between field measurements and our model simulations is found. The number sigma(s) H- s is confirmed to be a good index showing that the influence of an ice lid with sigma(s) H- s 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. ... Article in Journal/Newspaper albedo Arctic Arctic Ocean Sea ice HELDA – University of Helsinki Open Repository Arctic Arctic Ocean Journal of Geophysical Research: Oceans 123 11 8313 8328 |
institution |
Open Polar |
collection |
HELDA – University of Helsinki Open Repository |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
melt ponds Arctic sea ice radiative transfer refreezing numerical simulation ARCTIC SEA-ICE RADIATIVE-TRANSFER MONTE-CARLO BALANCE ALBEDO ENERGY WATER TRANSMISSION VALIDATION EVOLUTION 1172 Environmental sciences |
spellingShingle |
melt ponds Arctic sea ice radiative transfer refreezing numerical simulation ARCTIC SEA-ICE RADIATIVE-TRANSFER MONTE-CARLO BALANCE ALBEDO ENERGY WATER TRANSMISSION VALIDATION EVOLUTION 1172 Environmental sciences Lu, P. Cao, X. Wang, Q. Leppäranta, M. Cheng, B. Li, Z. Impact of a Surface Ice Lid on the Optical Properties of Melt Ponds |
topic_facet |
melt ponds Arctic sea ice radiative transfer refreezing numerical simulation ARCTIC SEA-ICE RADIATIVE-TRANSFER MONTE-CARLO BALANCE ALBEDO ENERGY WATER TRANSMISSION VALIDATION EVOLUTION 1172 Environmental sciences |
description |
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 H-s and the scattering coefficient sigma(s) of the ice lid are altered. Variations in the spectral albedo and transmittance T due to H-s 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 sigma(s) H- s. Good agreement between field measurements and our model simulations is found. The number sigma(s) H- s is confirmed to be a good index showing that the influence of an ice lid with sigma(s) H- s 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. ... |
author2 |
Institute for Atmospheric and Earth System Research (INAR) INAR Physics |
format |
Article in Journal/Newspaper |
author |
Lu, P. Cao, X. Wang, Q. Leppäranta, M. Cheng, B. Li, Z. |
author_facet |
Lu, P. Cao, X. Wang, Q. Leppäranta, M. Cheng, B. Li, Z. |
author_sort |
Lu, P. |
title |
Impact of a Surface Ice Lid on the Optical Properties of Melt Ponds |
title_short |
Impact of a Surface Ice Lid on the Optical Properties of Melt Ponds |
title_full |
Impact of a Surface Ice Lid on the Optical Properties of Melt Ponds |
title_fullStr |
Impact of a Surface Ice Lid on the Optical Properties of Melt Ponds |
title_full_unstemmed |
Impact of a Surface Ice Lid on the Optical Properties of Melt Ponds |
title_sort |
impact of a surface ice lid on the optical properties of melt ponds |
publisher |
American Geophysical Union |
publishDate |
2019 |
url |
http://hdl.handle.net/10138/301858 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
albedo Arctic Arctic Ocean Sea ice |
genre_facet |
albedo Arctic Arctic Ocean Sea ice |
op_relation |
10.1029/2018JC014161 This research was supported by the National Key Research and Development Program of China (2016YFC1402702), the Global Change Research Programme of China (2015CB953901), and the National Natural Science Foundation of China (41676187). M. L. was supported by the collaborative program of Academy of Finland and Chinese Academy of Sciences. B. C. was supported by the NSFC research facility mobility (41428603) and Academy of Finland (317999). The field observation data used are listed in the references. Natasche Oppelt and an anonymous reviewer are also acknowledged for their constructive comments that highly improved the manuscript. Lu , P , Cao , X , Wang , Q , Leppäranta , M , Cheng , B & Li , Z 2018 , ' Impact of a Surface Ice Lid on the Optical Properties of Melt Ponds ' , Journal of Geophysical Research : Oceans , vol. 123 , no. 11 , pp. 8313-8328 . https://doi.org/10.1029/2018JC014161 85056718750 1c94bd8e-ca5d-4ef5-a0db-d2298d94ae04 http://hdl.handle.net/10138/301858 000453907000035 |
op_rights |
unspecified openAccess info:eu-repo/semantics/openAccess |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
123 |
container_issue |
11 |
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8313 |
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8328 |
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