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Method and system for sea ice thickness distribution estimation based on least square adjustment

A least squares, thickness distribution technology, applied in design optimization/simulation and other directions, can solve the problems of inaccurate acquisition, difficulty in acquiring parameter values, uncertainty of sea ice thickness estimation results, etc., to avoid uncertainty, improve The effect of reliability

Inactive Publication Date: 2020-05-08
WUHAN UNIV
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Problems solved by technology

However, limited by the special geographical location and climatic conditions of the sea ice area, these parameters cannot be obtained accurately, and it is difficult to obtain parameter values ​​synchronized with satellite altimetry
The selection of these parameter values ​​brings great uncertainty to the sea ice thickness estimation results.

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  • Method and system for sea ice thickness distribution estimation based on least square adjustment
  • Method and system for sea ice thickness distribution estimation based on least square adjustment
  • Method and system for sea ice thickness distribution estimation based on least square adjustment

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Embodiment Construction

[0053] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0054] A method for estimating sea ice thickness distribution based on least squares adjustment provided by an embodiment of the present invention, the process is as follows figure 1 Shown:

[0055] Step 1, satellite altimetry data processing

[0056] Embodiment Based on the CryoSat-2 radar altimetry data, taking the Arctic sea ice area as an example, the longitude (lon), latitude (lat), elevation (h), average Sea level height (h ssh ), orbital number (orb), pulse peak value (PP) and pulse cumulative standard deviation (SSD), etc.;

[0057] Step 2, sea ice freeboard height extraction

[0058] Step 2.1, according to the characteristic parameters of the echo waveform, identify the interglacial channel

[0059] When using satellite altimetry to calculate sea ice freeboard height, the identification of polynyas is the key. The pulse signal o...

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Abstract

The invention provides a method and a system for sea ice thickness distribution estimation based on least square adjustment. The method comprises the following steps: carrying out satellite height measurement data processing, and extracting related parameters which comprise longitude, latitude, elevation, average sea surface height, orbit number, pulse peak value and pulse accumulation standard deviation; extracting a sea ice freeboard height: performing inter-ice waterway identification according to satellite echo signal related characteristic parameters to obtain the sea ice freeboard height; estimating the sea ice thickness: establishing a function model in a grid unit according to a conversion relationship from the sea ice freeboard to the sea ice thickness, establishing an observationequation, and solving by utilizing least square adjustment to obtain the corresponding sea ice thickness result; and performing resampling and filling to obtain a final sea ice thickness distributiondiagram. The method gets rid of a traditional experience valuing method, avoids uncertainty caused by conditions such as accumulated snow thickness, accumulated snow density and the like under special geographical positions and weather conditions of a sea ice area, and accordingly improves the reliability of sea ice thickness estimation.

Description

technical field [0001] The invention belongs to the technical field of geodetic surveying and surveying and mapping engineering, in particular to a sea ice thickness distribution method and system based on least squares adjustment. Background technique [0002] As an important factor in the climate system, sea ice covering the ocean surface plays a vital role in global heat balance, atmospheric circulation, ocean water circulation and temperature-salinity balance. The sea ice located at the special interface between the upper ocean and the lower atmosphere has a high surface irradiance, reflects most of the solar short-wave radiation, isolates the heat conduction and water vapor exchange between the ocean and the atmosphere, forms a thermal barrier, and keeps the area The low-energy state becomes the heat sink and cold source of the earth. Changes in sea ice cause the amplification effect of climate warming, especially the famous "Arctic amplification", which is an importan...

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Application Information

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IPC IPC(8): G06F30/20
Inventor 肖峰张胜凯李佳星耿通宣越李斐
Owner WUHAN UNIV
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