Seismic Impact of Large Earthquakes on Estimating Global Mean Ocean Mass Change from GRACE

Tang, Lu; Li, Jin; Chen, Jianli; Wang, Song‐Yun; Wang, Rui; Hu, Xiaogong

doi:10.3390/rs12060935

Cited by 17 publications

(10 citation statements)

References 39 publications

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“…Seismic deformation of large earthquakes may also have a notable effect on GRACE/GRACE-FO estimated mass changes that are related to the climate system. A recent study (Tang et al 2020) suggests that sea floor deformations due to several large off-shore earthquakes during the GRACE era could affect GRACE-estimated global ocean mass change rate by ~ 0.07 mm/year. The correction is fairly small compared to the GRACE uncertainty level; however, the consideration of this effect is expected to slightly improve GRACE estimates (Tang et al 2020).…”

Section: Other Issuesmentioning

confidence: 99%

Applications and Challenges of GRACE and GRACE Follow-On Satellite Gravimetry

et al. 2022

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Time-variable gravity measurements from the Gravity Recovery and Climate Experiment (GRACE) and GRACE Follow-On (GRACE-FO) missions have opened up a new avenue of opportunities for studying large-scale mass redistribution and transport in the Earth system. Over the past 19 years, GRACE/GRACE-FO time-variable gravity measurements have been widely used to study mass variations in different components of the Earth system, including the hydrosphere, ocean, cryosphere, and solid Earth, and significantly improved our understanding of long-term variability of the climate system. We carry out a comprehensive review of GRACE/GRACE-FO satellite gravimetry, time-variable gravity fields, data processing methods, and major applications in several different fields, including terrestrial water storage change, global ocean mass variation, ice sheets and glaciers mass balance, and deformation of the solid Earth. We discuss in detail several major challenges we need to face when using GRACE/GRACE-FO time-variable gravity measurements to study mass changes, and how we should address them. We also discuss the potential of satellite gravimetry in detecting gravitational changes that are believed to originate from the deep Earth. The extended record of GRACE/GRACE-FO gravity series, with expected continuous improvements in the coming years, will lead to a broader range of applications and improve our understanding of both climate change and the Earth system.

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Section: Other Issuesmentioning

confidence: 99%

Applications and Challenges of GRACE and GRACE Follow-On Satellite Gravimetry

et al. 2022

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“…Great earthquakes during the period (e.g., 2004 Sumatra‐Andaman and 2011 Tohoku‐Oki) would be responsible for the largest effect. However, seismic deformation contributions to BSL rate (during the GRACE period) are rather small, near ∼0.07 mm/yr (Tang et al., 2020), so it is likely that observed differences between Figures 1a and 1b are due to noise. The magnitude of this noise allows an OOR assessment of GRACE/GFO measurement errors over the oceans and over land, assuming errors there are similar.…”

Section: Assessment Using Grace/gfo Open Ocean Residualsmentioning

confidence: 99%

Error Assessment of GRACE and GRACE Follow‐On Mass Change

et al. 2021

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Time-variable gravity measurements from the Gravity Recovery and Climate Experiment (GRACE) and GRACE Follow-On (GFO) have opened up new opportunities for studying large-scale mass variation and redistribution in the Earth system, especially water mass change and transport within and between different components of the global water cycle, including the atmosphere, hydrosphere, ocean, and cryosphere. GRACE was launched in March 2002 and collected over 15 years of time-variable gravity measurements prior to decommissioning in November 2017 (Tapley et al., 2019). GFO was launched in May 2018, and has obtained over two years of gravity observations to date. Aside from a roughly 1-year gap between GRACE

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“…The secular effect of coseismic deformation has been gradually emphasized in the realization of the terrestrial reference frame (Tregoning et al., 2013), global mean ocean mass change (Tang et al., 2020), and global terrestrial water storage estimate (Deggim et al., 2021). Moreover, all these estimations concentrate only on global coseismic deformation and neglect postseismic deformation.…”

Section: Discussionmentioning

confidence: 99%

Seismic Contributions to Secular Changes in Global Geodynamic Parameters

Chun

2022

JGR Solid Earth

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Global geodynamic changes, that is, low-frequency geodynamic changes, include changes in the low-degree zonal coefficients of Earth's gravity field (e.g., dynamic oblateness J 2 ) and three-dimensional Earth rotation in polar motion and length of day (hereinafter, polar motion [PM] and LOD, respectively) resulting from internal mass redistribution (Chao & Ding, 2016;Ivins & Sammis, 1995). The secular (i.e., nonlinear) changes of geodynamic parameters can reveal dynamic processes with different spatiotemporal scales in the solid Earth system and mass transport in surface geophysical fluids (cf., Cazenave & Nerem, 2002).The secular change in Earth rotation (mainly PM, McCarthy & Luzum, 1996) and J 2 (Cheng & Tapley, 2004) is proverbially dominated by the glacier isostatic adjustment (GIA) effect but not fully (cf., Adhikari et al., 2018; also see Figure 1). What drives the residual of secular change in geodynamic parameters? Potential causes can be global plate tectonics (Spada et al., 1992), mantle convection (Steinberger & O'Connell, 1997), and surface geophysical fluids (Adhikari & Ivins, 2016). Moreover, dramatic changes in the secular trends (around 1998, see Figure 1) in geodynamic parameters became evident and were determined to have largely been caused (∼80%) by recent climate-driven mass migration of surface geophysical fluids due to global warming (Adhikari &

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Seismic Impact of Large Earthquakes on Estimating Global Mean Ocean Mass Change from GRACE

Cited by 17 publications

References 39 publications

Applications and Challenges of GRACE and GRACE Follow-On Satellite Gravimetry

Applications and Challenges of GRACE and GRACE Follow-On Satellite Gravimetry

Error Assessment of GRACE and GRACE Follow‐On Mass Change

Seismic Contributions to Secular Changes in Global Geodynamic Parameters

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