Decadal Variations in Equatorial Ellipticity and Principal Axis of the Earth from Satellite Laser Ranging/GRACE

IF 4.9 2区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Surveys in Geophysics Pub Date : 2024-08-03 DOI:10.1007/s10712-024-09852-w

Minkang Cheng

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Abstract

The Earth exhibits an equatorial flattening specified by the ellipticity and the east longitude (or orientation) of the equatorial major axis, which is uniquely determined by the degree 2 and order 2 gravitational coefficients, C₂₂ and S₂₂. The 31-year SLR (satellite laser ranging) and 22-year GRACE/GRACE-FO (gravity recovery and climate experiment) data are analyzed to study the climate-related secular and 5.7 years to decadal variations in C₂₂ and S₂₂, in turn, the drift and decadal variation in the Earth’s equatorial ellipticity and orientation of the principal axis of the least moment of inertia. The effects of the surface floating mass changes (including atmosphere, ocean and surface water redistribution and the melting of the mountain and polar glaciers) and the interior fluid convective (Earth’s core flows) were evaluated. Results reveal that the equatorial ellipticity of the Earth is linearly increasing along with a remarkable decadal variation and the Earth’s equator is flattening by ~ 0.16 mm/yr.

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从卫星激光测距/GRACE 看地球赤道椭圆度和主轴的十年变化

地球呈现出一种赤道扁平化现象，由赤道主轴的椭圆度和东经（或方位）决定，而赤道主轴的椭圆度和东经（或方位）则由度数 2 和阶数 2 重力系数 C22 和 S22 唯一决定。通过分析 31 年的卫星激光测距（SLR）和 22 年的重力恢复和气候实验（GRACE/GRACE-FO）数据，研究了与气候相关的 C22 和 S22 的世代变化和 5.7 年至十年的变化，进而研究了地球赤道椭圆度和最小惯性矩主轴方向的漂移和十年变化。对地表浮动质量变化（包括大气、海洋和地表水的重新分布以及高山和极地冰川的融化）和内部流体对流（地核流动）的影响进行了评估。结果显示，地球赤道椭圆度呈线性上升趋势，并有显著的十年变化，地球赤道以 ~ 0.16 毫米/年的速度变平。

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来源期刊

Surveys in Geophysics 地学-地球化学与地球物理

CiteScore

10.00

自引率

10.90%

发文量

审稿时长

4.5 months

期刊介绍： Surveys in Geophysics publishes refereed review articles on the physical, chemical and biological processes occurring within the Earth, on its surface, in its atmosphere and in the near-Earth space environment, including relations with other bodies in the solar system. Observations, their interpretation, theory and modelling are covered in papers dealing with any of the Earth and space sciences.