Partitioning of solar radiation in Arctic sea ice during melt season

• Autorzy: Lu P. , Cheng B. , Leppäranta M. , Li Z.

Identyfikatory

DOI

10.1016/j.oceano.2018.03.002

• Języki publikacji: EN

Abstrakty

EN

The partitioning of solar radiation in the Arctic sea ice during the melt season is investigated using a radiative transfer model containing three layers of melt pond, underlying sea ice, and ocean beneath ice. The wavelength distribution of the spectral solar irradiance clearly narrowed with increasing depth into ice, from 350-900 nm at the pond surface to 400-600 nm in the ocean beneath. In contrast, the net spectral irradiance is quite uniform. The absorbed solar energy is sensitive to both pond depth (H_p) and the underlying ice thickness (H_i). The solar energy absorbed by the melt pond (Ψ_p) is proportional only to H_p. However, the solar energy absorbed by the underlying ice (Ψ_i) is more complicated due to the counteracting effects arising from the pond and ice to the energy absorption. In September, Ψ_p decreased by 10% from its August value, which is attributed to more components in the shortwave band (<530 nm) of the incident solar radiation in September relative to August. The absorption coefficient of the sea ice only enhances the absorbed energy in ice, while an increase in the ice scattering coefficient only enhances the absorbed energy in the melt pond, although the resulted changes in Ψ_p and Ψ_i are smaller than that in the albedo and transmittance. The energy absorption rate with depth depends strongly on the incident irradiance and ice scattering, but only weakly on pond depth. Our results are comparable to previous field measurements and numerical simulations. We conclude that the incident solar energy was largely absorbed by the melt pond rather than by the underlying sea ice.

Słowa kluczowe

EN

Arctic sea ice; melt pond; radiation transfer; mass balance; numerical modelling

• Wydawca: Polish Academy of Sciences, Institute of Oceanology ; Elsevier
• Czasopismo: Oceanologia
• Rocznik: 2018
• Tom: No. 60 (4)
• Strony: 464--477
• Opis fizyczny: Bibliogr. 45 poz., tab., wykr.

Twórcy

autor

Lu P.

• State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, China

autor

Cheng B.

• Finnish Meteorological Institute, Helsinki, Finland

autor

Leppäranta M.

• Institute of Atmospheric and Earth Sciences, University of Helsinki, Helsinki, Finland

autor

Li Z.

• State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, China

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).