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Related Concept Videos

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Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
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The Earth's shape is best described as an ellipsoid, a slightly flattened sphere created by rotating an ellipse around its minor axis. This flattening results in the polar axis being about 21 kilometers shorter than the equatorial axis. In contrast, the geoid represents the Earth's gravitational shape and aligns with the mean sea level (MSL). The geoid is an irregular equipotential surface where gravity is perpendicular at every point. Variations in Earth's mass distribution cause geoid...
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An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
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Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
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When a fluid encounters a solid surface, a boundary layer forms due to the interaction between the fluid's motion and the stationary surface. This phenomenon is characterized by a thin region adjacent to the surface where viscous forces dominate, influencing the fluid's velocity profile. The development of the boundary layer begins at the leading edge of the surface and evolves as the fluid moves downstream.As the fluid flows over the surface, friction between the fluid and the wall slows down...
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Multiple-data-based monthly geopotential model set LDCmgm90.

Wei Chen1, Jiesi Luo2, Jim Ray3

  • 1Collaborative Innovation Center of Geospatial Technology/Key Laboratory of Geospace Environment and Geodesy, School of Geodesy and Geomatics, Wuhan University, Wuhan, China. wchen@sgg.whu.edu.cn.

Scientific Data
|October 25, 2019
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Summary
This summary is machine-generated.

A new gravity model, LDCmgm90, improves upon GRACE data quality. It corrects errors like stripes in gravity measurements, offering a clearer view of Earth's mass transport.

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Area of Science:

  • Earth Science
  • Geophysics
  • Satellite Gravimetry

Background:

  • The Gravity Recovery and Climate Experiment (GRACE) mission provides crucial Earth science data but suffers from longitudinal stripe errors and other product flaws.
  • Existing GRACE monthly products often require significant correction for reliable analysis of Earth system processes.

Purpose of the Study:

  • To develop an improved monthly gravity model, LDCmgm90, by integrating corrected GRACE data with other observational and model-based datasets.
  • To mitigate common errors found in standard GRACE gravity field solutions, enhancing data usability for scientific research.

Main Methods:

  • Developed the LDCmgm90 model using corrected GRACE Mascon time series and updated Least Difference Combination global angular momenta (LDCgam) data.
  • The LDCgam data were created by assimilating degree-2 Stokes coefficients from GRACE (including Mascon) and Satellite Laser Ranging (SLR) data into circulation model outputs.
  • Constrained the assimilation process using accurately measured Earth orientation parameters within the Least Difference Combination (LDC) framework.

Main Results:

  • The LDCmgm90 monthly gravity models, expressed as Stokes coefficients up to degree and order 90, are free from the characteristic stripe-pattern errors of classical GRACE products.
  • The new model benefits from the combined strengths of various input datasets, leading to a higher quality gravity field representation.

Conclusions:

  • The LDCmgm90 model offers a significant improvement over standard GRACE products, providing a more accurate and reliable dataset for Earth science studies.
  • This enhanced gravity model facilitates better understanding of Earth's mass transport and related climate dynamics.