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Method for simulating generating and thawing process of sea ice covered by thin snow

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: 2015-05-27
JIANGSU UNIV OF SCI & TECH
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  • Summary
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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  • Method for simulating generating and thawing process of sea ice covered by thin snow
  • Method for simulating generating and thawing process of sea ice covered by thin snow
  • Method for simulating generating and thawing process of sea ice covered by thin snow

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Effect test

Embodiment 1

[0038] like figure 1 As shown, the simulation method of sea ice formation and loss process under thin snow cover includes the following steps:

[0039] (1) Set the sea ice and its environmental parameters under the thin snow cover at time t;

[0040] At time t, the sea ice parameters have {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 parameter {ρ w ,C w , T w}, where ρ w is the density of seawater, C w is the specific heat of seawater, T w is the temperature of seawater; 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 parameters of the air above the snow layer and its atmospheric radiation are {T a ,u a ,q a ,P 0 ,C,ε LW ,e 0 ,θ z...

Embodiment 2

[0061] (1) Set the sea ice and its environmental parameters under the thin snow cover at time t;

[0062] At time t, the sea ice parameters have {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] The parameters of the seawater under the sea ice {ρ w ,C w , T w}, where seawater density ρ w =1025kg / m 3 , seawater specific heat C w =4096J / (kg K), seawater temperature T w =272.5K.

[0064] The parameters of the snow layer are {h s ,ρ s , T s ,α}, where, the snow layer thickness h s =0.015m, snow layer density ρ s =320kg / m 3 , snow layer temperature T s =268K, snow albedo α=0.8.

[0065] The parameters of the air above the snow layer and its atmospheric radiation are {T a ,u a ,q a ,P 0 ,C,ε LW ,e 0 ,θ z}, where the air temperature T a =268K, wind speed u above the ice surface a =7.3m / s, air specifi...

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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 in particular relates to a method for simulating the generation and disappearance of sea ice covered by thin snow. Background technique [0002] Sea ice refers to the salt water ice formed by direct freezing of seawater, which is a mixture of solid ice, brine and air bubbles containing salt. The drift and diffusion of sea ice can pose a serious threat to offshore oil platforms and ship transportation. At the same time, sea ice is also one of the important influencing factors in the research fields of ocean hydrology, atmospheric circulation and climate, especially thin sea ice. It plays a key role in the study of water vapor flow and salinity flow. [0003] The means of sea ice monitoring mainly include observation stations, offshore monitoring platforms and remote sensing. The offshore monitoring platform belongs to direct on-site measurement and has high precision; however, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 杨永红张贞凯凌霖奚彩萍
Owner JIANGSU UNIV OF SCI & TECH
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