Land

Land

Affiliation: Woods Hole Research Center
Event Date: Thursday, February 20, 2020

Location: Building 33, Room H114

Jennifer Francis

February 26, 2020

1:30-2:30 pm

Science Highlights

Using satellites and partnership to value ecosystem benefits

Water storage trends in High Mountain Asia

GRACE observability of the gravitational changes of the Earth’s free oscillation from earthquakes

Pages

Field Campaigns

Space Missions

Research Areas

Over its 40-year history of development and operation, the space geodetic technique called very long baseline interferometry (VLBI) has provided an unprecedented record of the motions of the solid Earth.

Since launch in 2002, data from the Gravity Recovery and Climate Experiment (GRACE) have provided a synoptic view of mass change associated seismic cycle and other processes [Figure 1}.  As part of the GRACE and now the GRACE-FO science teams,  we have studied the long-wavelength gravity signal associated with varied earthquakes, including the great subduction zone earthquakes (e.g. Sumatra, 2004; Maule, Chile, 2010, and Tohuku, Japan, 2011), as well as strike-slip and normal faulting events that also produce discernible gravity changes (e.g. 2012 Indian Ocean earthquakes, Han et al., 2015).

Earth possesses a strong magnetic field that is originated from the Earth’s fluid outer core (the intrinsic field). This field accounts for more than 95% of the magnetic energy of the observed geomagnetic field at the Earth’s surface. Its temporal and spatial variations hold some of the key knowledge of Earth’s deep interior properties, of interactions and responses between the fluid core and the solid Earth, and of the Earth system evolution history.

Outreach

Earth Observatory

Explore the causes and effects of climatic and environmental change through the use of real satellite data.

Data Files

For more than four decades, satellite laser ranging (SLR) measurements have been monitoring changes in Earth’s dynamic oblateness, C20, which is the largest component of Earth’s time-variable gravity field. The launch of GRACE in 2002, and subsequent launch of GRACE-FO in 2018, has revolutionized the ability to track mass fluxes at a spatial resolution of 300-500 km. Early in the mission, however, GRACE-derived estimates of C20 were deemed unreliable, as evidenced by a non-geophysical 161-day periodic signal and trend estimates that differed significantly from those determined with SLR. Throughout the mission, SLR-derived C20 estimates have been used to replace the values obtained with GRACE.

The NASA-USDA Global soil moisture data provides soil moisture information across the globe at 0.25°

Instruments

he Doppler Orbitography by Radiopositioning Integrated on Satellite (DORIS) was developed in France by the Centre National d'Etudes Spatiales (CNES) with the cooperation of Groupe de Recherche en Géodésie Spatiale (GRGS) and the Institut Géographique National (IGN).

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NASA's Land, Vegetation, and Ice Sensor or "LVIS", is an airborne, wide-swath imaging laser altimeter system that is flown over target areas to collect data on surface topography and 3-d structure.

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The GEDI website provides answers to how deforestation has contributed to atmospheric CO2 concentrations, carbon absorbing, and habitat degradation affects.

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Models

​SWATOnline is a web application developed for hydroclimatic application to leverage data sharing capabilities employing current web technologies.  The SWATOnline web app can be duplicated, installed, and hosted anywhere.  The work presented in this web app represents an effort to lower technical barriers for the Soil and Water Assessment Tool (SWAT) model through using open source web development, web services, and cloud storage technologies.