Method for simulating generating and thawing process of sea ice covered by thin snow
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An analog method and technology of snow coverage, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as low efficiency
Inactive Publication Date: 2013-01-30
JIANGSU UNIV OF SCI & TECH
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In the case of snow cover, the thermal diffusion equation is usually used to solve the rate of change of the internal temperature of sea ice with position and time to simulate the process of sea ice production and disappearance. In order to obtain higher accuracy, snow and sea ice are usually Hierarchical calculation, this method is inefficient and needs to consider the stability of the algorithm
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Embodiment 1
[0038] Such as figure 1 As shown, the simulation method for the generation and disappearance of sea ice covered by thin snow includes the following steps:
[0039] (1) Set the sea ice and its environmental parameters covered by thin snow at time t;
[0040] At time t, the sea ice parameter has {h si ,ρ si ,T si ,T f }, where h si Is the thickness of sea ice, ρ si Is the density of sea ice, T si Is the temperature of sea ice, T f Is the freezing point temperature of the ice surface; the parameters of the seawater under the sea ice {ρ w ,C w ,T w }, where ρ w Is the density of sea water, C w Is the specific heat of sea water, T w Is the temperature of sea water; the parameters of the snow layer are {h s ,ρ s ,T s ,α}, where h s Is the thickness of the snow layer, ρ s Is the density of the snow layer, T s Is the temperature of the snow layer, α is the albedo of the snow layer; the air above the snow layer and its atmospheric radiation parameters are {T a ,u a ,q a ,P 0 ,C,ε LW ,...
Embodiment 2
[0061] (1) Set the sea ice and its environmental parameters covered by thin snow at time t;
[0062] At time t, the sea ice parameter has {h is ,ρ si ,T si ,T f }, where the sea ice thickness h is =1.0m, sea ice density ρ si =910kg / m 3 , Sea ice temperature T si =272K, the freezing point temperature T of the ice surface f =271.2K.
[0063] Parameters of the seawater under the sea ice {ρ w ,C w ,T w }, where the seawater density ρ w =1025kg / m 3 , The specific heat of sea water C w =4096J / (kg·K), sea water temperature T w =272.5K.
[0064] The parameters of the snow layer are {h s ,ρ s ,T s ,α}, where, the thickness of the snow layer h s =0.015m, density of snow layer ρ s =320kg / m 3 , The snow temperature T s =268K, the snow albedo α=0.8.
[0065] The parameters of the air and its atmospheric radiation above the snow layer are {T a ,u a ,q a ,P 0 ,C,ε LW ,e 0 ,θ z }, where, the air temperature T a =268K, the wind speed u above the ice surface a =7.3m / s, air specific humidity q a...
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Abstract
The invention discloses a method for simulating the generating and thawing process of sea ice covered by thin snow. The method comprises the steps of: setting the sea ice covered by the thin snow and environmental parameters of the sea ice; calculating parameters such as salinity, heat conductivity, and melting latent heat of the sea ice; calculating the solar shortwave radiation, the atmosphere long wave radiation and various heat fluxes of the sea ice according to the environmental parameters; calculating the temperature at the boundary of a snow layer and an ice surface according to a thermodynamic equation; and judging whether the upper boundary layer of the sea ice is thawed or not, if so, calculating the change rate of the ice thickness of the upper boundary ice layer; calculating the change rate of the thickness of the lower boundary layer of the sea ice according to an internal heat conduction equation; and finally calculating the thickness of the sea ice according to the change rates of the thicknesses of the upper and lower boundary layers of the sea ice. The method has the characteristic of high calculation efficiency and can be used for the simulation on the generating and thawing process of the sea ice covered by thin snow.
Description
Technical field [0001] The invention belongs to the technical field of physical oceanography, and specifically relates to a method for simulating the generation and dissipation process of sea ice covered by thin snow. Background technique [0002] Sea ice refers to salt water ice that is directly frozen from sea water, and is a mixture of solid ice, brine, and bubbles containing salt. The drift and diffusion of sea ice can cause serious threats to offshore oil platforms and ship transportation. At the same time, sea ice is also one of the important factors in the research fields of marine hydrology, atmospheric circulation and climate, especially the heat flow of thin sea ice on the ocean surface. , Water vapor flow and salinity flow research play a key role. [0003] The methods of sea ice monitoring mainly include observation stations, offshore monitoring platforms, and remote sensing. The offshore monitoring platform is a direct measurement on the spot and has high accuracy; h...
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