A5061870416- Geophysics and Gravity Measurements
- Methane Hydrates and Related Phenomena
- Atmospheric and Environmental Gas Dynamics
- Environmental Monitoring and Data Management
- Aerospace Engineering and Energy Systems
- GNSS positioning and interference
- Cryospheric studies and observations
- Power Systems and Technologies
- Geomagnetism and Paleomagnetism Studies
- Cancer, Hypoxia, and Metabolism
- Oceanographic and Atmospheric Processes
- Climate variability and models
- Spacecraft and Cryogenic Technologies
- Solar and Space Plasma Dynamics
- Fluorine in Organic Chemistry
- Ionosphere and magnetosphere dynamics
- Reservoir Engineering and Simulation Methods
- Meteorological Phenomena and Simulations
- Inertial Sensor and Navigation
- Geology and Paleoclimatology Research
- Scientific Research and Discoveries
- Planetary Science and Exploration
- Arctic and Antarctic ice dynamics
- Geological and Geophysical Studies
- Distributed and Parallel Computing Systems
Jet Propulsion Laboratory
2016-2025
NOAA Atlantic Oceanographic and Meteorological Laboratories
2018
National Oceanic and Atmospheric Administration
2018
National Oceanography Centre
2018
University of Miami
2018
California Institute of Technology
2010-2015
Max Planck Society
2007-2009
Max Planck Institute for Meteorology
2007-2009
Max Planck Institute for Comparative and International Private Law
2008
[1] We assess the accuracy of global-gridded terrestrial water storage (TWS) estimates derived from temporal gravity field variations observed by Gravity Recovery and Climate Experiment (GRACE) satellites. The TWS data set has been corrected for signal modification due to filtering truncation. Simulations land-hydrology models are used infer relationships between regional time series representing different spatial scales. These relationships, which independent actual GRACE data, extrapolate...
Abstract We discuss several classes of improvements to gravity solutions from the Gravity Recovery and Climate Experiment (GRACE) mission. These include both in background geophysical models orbital parameterization leading unconstrained spherical harmonic solution JPL RL05, an alternate RL05M mass concentration (mascon) benefitting those same but derived surface cap mascons. The mascon basis functions allow for convenient application a priori information near‐global prevent striping...
Abstract Recent advances in processing data from the Gravity Recovery and Climate Experiment (GRACE) have led to a new generation of gravity solutions constrained within Bayesian framework remove correlated errors rather than relying on empirical filters. The JPL RL05M mascon solution is one such solution, solving for mass variations using spherical cap concentration elements (mascons), while external information provided by near‐global geophysical models constrain solution. This...
Abstract Since June, 2018, the Gravity Recovery and Climate Experiment Follow‐On (GRACE‐FO) is extending 15‐year monthly mass change record of GRACE mission, which ended in June 2017. The GRACE‐FO instrument flight system performance has improved over GRACE. Better attitude solutions enhanced pointing result reduced fuel consumption gravity range rate post‐fit residuals. One accelerometer requires additional calibrations due to unexpected measurement noise. fields from 2018 through December...
Abstract. Global mean sea level is an integral of changes occurring in the climate system response to unforced variability as well natural and anthropogenic forcing factors. Its temporal evolution allows (e.g., acceleration) be detected one or more components. Study sea-level budget provides constraints on missing poorly known contributions, such unsurveyed deep ocean still uncertain land water component. In context World Climate Research Programme Grand Challenge entitled Regional Sea Level...
Abstract Recent developments in mascon (mass concentration) solutions for GRACE (Gravity Recovery and Climate Experiment) satellite data have significantly increased the spatial localization amplitude of recovered terrestrial Total Water Storage anomalies (TWSA); however, land hydrology applications been limited. Here we compare TWSA from April 2002 through March 2015 (1) newly released mascons Center Space Research (CSR‐M) with (2) NASA JPL (JPL‐M), (3) CSR Tellus gridded spherical...
Changes in sea level lead to some of the most severe impacts anthropogenic climate change. Consequently, they are a subject great interest both scientific research and public policy. This paper defines concepts terminology associated with sea-level changes order facilitate progress science, which communication is sometimes hindered by inconsistent unclear language. We identify key terms clarify their physical mathematical meanings, make links between across disciplines, draw distinctions...
Global mean sea level (GMSL) dropped by 5 mm between the beginning of 2010 and mid 2011. This drop occurred despite background rate rise, 3 per year, which dominates most 18‐year record observed satellite altimeters. Using a combination in situ data, we show that decline ocean mass, explains drop, coincides with an equivalent increase terrestrial water storage, primarily over Australia, northern South America, Southeast Asia. temporary shift from to land is closely related transition El Niño...
Abstract Between 2003-2016, the Greenland ice sheet (GrIS) was one of largest contributors to sea level rise, as it lost about 255 Gt per year. This mass loss slowed in 2017 and 2018 100 yr −1 . Here we examine further changes rate GrIS loss, by analyzing data from GRACE-FO (Gravity Recovery Climate Experiment – Follow On) satellite mission, launched May 2018. Using simulations with regional climate models show that losses observed GRACE missions are lower than any other two year period...
GPS is accurately recording vertical motion of Earth's surface in elastic response to seasonal changes water storage California. California's mountains subside up 12 mm the fall and winter due load snow rain then rise an identical amount spring summer when melts, runs off, soil moisture evaporates. We invert observations motions infer equivalent thickness. resolves distribution change total across physiographic provinces at a resolution 50 km, compared 200 km from Gravity Recovery Climate...
Abstract We examine data continuity between the Gravity Recovery and Climate Experiment (GRACE) GRACE Follow‐On (FO) missions over Greenland Antarctica using independent from mass budget method, which calculates difference ice sheet surface balance discharge at periphery. For both sheets, we find consistent GRACE/GRACE‐FO time series across gap, continental regional scales, gap is confidently filled with method data. In Greenland, GRACE‐FO reveal an exceptional summer loss of 600 Gt in 2019...
Antarctic volume changes during the past 21 thousand years are smaller than previously thought, and here we construct an ice sheet history that drives a forward model prediction of glacial isostatic adjustment (GIA) gravity signal. The new model, in turn, should give predictions constrained with recent uplift data. impact GIA signal on Gravity Recovery Climate Experiment (GRACE) mass balance estimate depends specific GRACE analysis method used. For described this paper, contribution to...
The energy radiated by the Earth towards space does not compensate incoming radiation from Sun leading to a small positive imbalance at top of atmosphere (0.4-1.Wm-2). This is coined Earth's Energy Imbalance (EEI). It mostly caused anthropogenic greenhouse gases emissions and driving current warming planet. Precise monitoring EEI critical assess status climate change future evolution climate. But challenging as two order magnitude smaller than fluxes in out Earth. Over 93% excess that gained...
Abstract Satellite laser ranging (SLR) observations have long been relied upon for measuring changes in Earth's dynamic oblateness, . This major component of time‐variable gravity field is not well observed by the Gravity Recovery and Climate Experiment (GRACE) GRACE Follow‐On (GRACE‐FO) missions, leading to common practice replacing their values with those obtained SLR. The coefficient, which has a large impact on recovered Antarctic Ice Sheet mass changes, shown here be poorly...
Abstract. The Earth climate system is out of energy balance, and heat has accumulated continuously over the past decades, warming ocean, land, cryosphere, atmosphere. According to Sixth Assessment Report by Working Group I Intergovernmental Panel on Climate Change, this planetary multiple decades human-driven results in unprecedented committed changes system, with adverse impacts for ecosystems human systems. inventory provides a measure imbalance (EEI) allows quantifying how much as well...
Abstract In 2011, a significant drop in global sea level occurred that was unprecedented the altimeter era and concurrent with an exceptionally strong La Niña. This analysis examines multiple data sets exploring physical basis for drop's exceptional intensity persistence. Australia's hydrologic surface mass anomaly is shown to have been dominant contributor 2011 total, associated precipitation anomalies were among highest on record. The persistence of attributed continent's unique hydrology,...
Abstract This paper analyzes regional sea level changes in a climate change simulation using the Max Planck Institute for Meteorology (MPI) coupled atmosphere–ocean general circulation model ECHAM5/MPI-OM. The scenario builds on observed atmospheric greenhouse gas (GHG) concentrations from 1860 to 2000, followed by International Panel Climate Change (IPCC) A1B until 2100; 2100 2199, GHG are fixed at level. As compared with unperturbed control climate, global rises 0.26 m 2100, and 0.56 2199...
Abstract The Global Positioning System (GPS) measures elastic ground loading deformation in response to hydrological mass variations on or near Earth's surface. We present a time series of change terrestrial water storage as function position Washington and Oregon estimated using GPS measurements vertical displacement distribution variation inferred from is highly correlated with physiographic provinces: the seasonal mostly located mountain areas, such Cascade Range Olympic Mountains, much...
Abstract Drought struck California during 7 of the 9 years from 2007 to 2015, reducing state's available water resources. Pumping Central Valley groundwater has produced spectacular land subsidence. Uplift adjacent Sierra Nevada mountains been proposed be either tectonic uplift or solid Earth's elastic response unloading groundwater. We find that 24 mm October 2011 just 5 is by loss, less than 2 uplift, and 17 loss in Nevada. invert GPS vertical displacements recording infer changes storage...