A method for estimating the volume change of subglacial lakes

A technology of volume change and change, which is applied in the field of environmental remote sensing applications, can solve the problems of inability to accurately obtain the shape and volume changes of subglacial lakes, and the space or time sampling of altimetry satellites is scarce, so that the implementation steps are simple and easy, and the data Access convenience, research-enhancing effects

Active Publication Date: 2020-10-02
NANJING UNIV
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Problems solved by technology

[0005] The problem to be solved by the present invention is to provide a method for estimating the volume change of subglacial lakes, which can accurately obtain , effectively reflect the fluctuation of the surface of the subglacial lake, and then complete the estimation of the volume change of the subglacial lake

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  • A method for estimating the volume change of subglacial lakes
  • A method for estimating the volume change of subglacial lakes
  • A method for estimating the volume change of subglacial lakes

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Embodiment Construction

[0029] The present invention will be described in detail below according to the accompanying drawings, so that the purpose and effect of the present invention will become more obvious.

[0030] The CryoSat-2 radar altimeter SARIn mode L1B waveform data of the CryoSat-2 radar altimeter SARIn model used for estimating the volume change of the Antarctic subglacial lake in the present invention is downloaded from the European Space Agency (ESA) website (ftp: / / science-pds.cryosat.esa.int), and the time is January 2011-December 2017.

[0031] Such as figure 1 It is the flow chart of this embodiment, and the method for estimating the volume change of the subglacial lake in this embodiment includes the following steps:

[0032] The first step, get Cook E2 L1B waveform data from the CryoSat-2 radar altimeter SARIn mode for 2011-2017 in the subglacial lake region. The range of the study area is 155.1E-156.3E, 72.69S-76.97S.

[0033] The second step is to calculate the surface elevat...

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Abstract

The invention relates to an estimation method for the volume change of a subglacial lake. The estimation method comprises the steps that L1B waveform data in an SARIn mode of a CryoSat-2 radar altimeter in the corresponding time period are obtained; the surface elevation of a subglacial lake area is calculated through a waveform re-tracking method; obtained surface elevation data are pretreated toremove elevation change anomaly points; the pretreated elevation data are subjected to slope correction through a DEM to remove the error caused by the slope; 100*100 m of grids are finally generatedthrough kriging interpolation, then the elevation change in the corresponding time period is calculated, back scattering energy is added into elevation change values for correction, and the influenceof the back scattering energy to the elevation change is eliminated; and the shape and area of the subglacial lake are obtained through the elevation change values, the elevation change values of thesurface of the subglacial lake of each grid are integrated, and finally the volume change of the subglacial lake in the corresponding time period is obtained. According to the estimation method, fluctuation of the surface of the subglacial lake can be accurately and effectively reflected, and thus the volume change of the subglacial lake is estimated.

Description

technical field [0001] The invention relates to a method for estimating the volume change of a subglacial lake, belonging to the technical field of environmental remote sensing applications. Background technique [0002] Antarctic subglacial lakes have the ability to store and release regularly. It is estimated that some of the 65GT water produced by melting under the ice each year is stored and released regularly by these lakes. Determining the distribution, periodicity, and volumetric fluxes of lake drainage and refilling water is helpful for the establishment of subglacial hydrological models and ice sheet flow models, the estimation of subglacial melting rates and geothermal fluxes, and the transport of freshwater to subglacial shelves. understand. [0003] Early satellite records were limited in their ability to monitor fluctuations in subglacial lake volume because they were sparsely sampled in space or time and could not capture the entire subglacial lake cycle. Whi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C13/00
CPCG01C13/00Y02A90/30
Inventor 柯长青韩少帅蔡宇沈校熠
Owner NANJING UNIV
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