The Time-Variable Geoid Over North America from GRACE John Wahr, University of Colorado.

Slides:

Advertisements

Similar presentations

Using GRACE Satellite Acceleration Data to Recover Arctic Ocean Tides Bryan Killett 1, John Wahr 1, Shailen D. Desai 2, Dah-Ning Yuan 2, Mike Watkins 2,

Advertisements

Chapter 24 Gauss’s Law.

ILRS Workshop, 2008, A 33 Year Time History of the J2 Changes from SLR Minkang Cheng and Byron D. Tapley Center for Space Research.

An estimate of post-seismic gravity change caused by the 1960 Chile earthquake and comparison with GRACE gravity fields Y. Tanaka 1, 2, V. Klemann 2, K.

Smoothed Seismicity Rates Karen Felzer USGS. Decision points #1: Which smoothing algorithm to use? National Hazard Map smoothing method (Frankel, 1996)?

Continental mass variations from Independent Component Analysis (ICA) of Level-2 monthly GRACE data Frédéric Frappart 1, Guillaume Ramillien 1, Inga Bergmann.

Determination of Gravity Variations in Northern Europe from GRACE Jürgen Müller, Matthias Neumann-Redlin Institut für Erdmessung, University of Hannover,

Some Hydrological and Cryospheric Applications of GRACE John Wahr (U of Colorado), Sean Swenson (NCAR), Isabella Velicogna (U of California at Irvine)

Present-Day Sea Level Change Present-Day Sea Level Change Assessment and Key Uncertainties Anny Cazenave Anny Cazenave LEGOS, Toulouse.

GRACE GRAVITY FIELD SOLUTIONS USING THE DIFFERENTIAL GRAVIMETRY APPROACH M. Weigelt, W. Keller.

SEAT Traverse The Satellite Era Accumulation Traverse (SEAT) collected near-surface firn cores and Ultra High Frequency (UHF) Frequency Modulated.

What's Happening in the Bathtub?: An Overview of Present-Day Sea Level Change R. Steven Nerem University of Colorado Department of Aerospace Engineering.

Nominal Level Measurement n numbers used as ways to identify or name categories n numbers do not indicate degrees of a variable but simple groupings of.

Lightning in Salt Lake and Utah Valleys Michael Olson Meteo 5120 Applied Math and Statistics John Horel.

Time-depending validation of ocean mass anomalies from GRACE by means of satellite altimetry and numerical models Henryk Dobslaw and Maik Thomas GeoForschungsZentrum.

Cryospheric and Hydrologic Contributions to Global Sea Level Change M. Tamisiea Proudman Oceanographic Laboratory R. Steven Nerem University of Colorado.

Recent results from GRACE in Greenland and Antarctica Isabella Velicogna* and John Wahr** * ESS, University of California Irvine, Irvine CA ** Dept Of.

Don P. Chambers Center for Space Research The University of Texas at Austin Understanding Sea-Level Rise and Variability 6-9 June, 2006 Paris, France The.

J. Famiglietti 1, T. Syed 1, P. Yeh 1,2 and M. Rodell 3 1 Dept. of Earth System Science, University of California,Irvine, USA 2 now at: Institute of Industrial.

Nynke Hofstra and Mark New Oxford University Centre for the Environment Trends in extremes in the ENSEMBLES daily gridded observational datasets for Europe.

WE WA VI ST PE MO MB MC CO BH MC MB MO PE ST VI WA Comparison of GRACE gravity field solutions, hydrological models and time series of superconducting.

Snowpack Measurements From Underground John Wahr and Judah Levine Department of Physics University of Colorado.

Using GRACE to estimate changes in land water storage: present limitations and future potential John Wahr, Sean Swenson, Isabella Velicogna University.

Last Time: Introduction to Gravity Governed by LaPlace’s equation: with solution of the form: If we have a spherical body with mass M and constant (or.

Assessment of Basin-scale Terrestrial Water Storage Variations from Reprocessed GRACE Gravity Fields for Climate Model Validation L. Zhang, H. Dobslaw,

Toward closing the globally averaged sea level budget on seasonal to interannual time scales Josh K. Willis Jet Propulsion.

1 Approximate decorrelation and non-isotropic smoothing of time-variable GRACE gravity field models Jürgen Kusche, Roland Schmidt with input from Susanna.

Comparison of Seasonal Terrestrial Water Storage Variations from GRACE with in situ Measurements from the High Plains Aquifer Gil Strassberg 1, Bridget.

Can GPS horizontals provide useful information about surface loading? Case studies in California and Greenland. John Wahr (U of Colorado) Abbas Khan (DTU.

Coseismic and Postseismic Deformation from the Sumatra-Andaman Earthquake Observed by GRACE Joint International GSTM and DFG SPP Symposium, October 15-17,

Thermosteric Effects on Long-Term Global Sea Level Change Jianli Chen Center for Space Research, University of Texas at Austin, USA

Gravity Satellite Data and Calculated Soil Moisture: A Mutual Validation (update) Huug van den Dool 1, Yun Fan 1, John Wahr 2 and Sean Swenson 2 1 Climate.

Patagonia Ice Field Melting Observed by GRACE Joint International GSTM and DFG SPP Symposium, October 15-17, 2007 at GFZ Potsdam J.L. Chen 1, C.R. Wilson.

Closure of the Budget of Global Sea Level Rise Over the GRACE Era: The Importance and Magnitudes of the Corrections Required for Quaternary Ice-Age Influence.

Using Flubber to Study Glaciers A Hands-on Experience.

Lecture note 2 Summarizing Relationships among variables © by Aaed Al- Rabai.

Alaskan Mountain Glacial Melting Observed by GRACE 2006 WPGM, July , Beijing, China G32A-02 Wed. 11:05 AM J.L. Chen 1, B.D. Tapley 1, C.R. Wilson.

Water storage variations from time-variable gravity data Andreas Güntner Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences Section.

SNARF: Theory and Practice, and Implications Thomas Herring Department of Earth Atmospheric and Planetary Sciences, MIT

Seasonal Terrestrial Water Storage Change and Global Mean Sea Level Variation Jianli Chen 1 and Clark Wilson 1,2 Center for Space Research, The University.

Recent applications of GRACE gravity data for continental hydrology Andreas Güntner Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences.

GEOSCIENCES UASCIENCE T HE U NIVERSITY OF Arizona ® C. G. Chase Department of Geosciences University of Arizona, David Coblentz & Aviva Sussman LANL Geoid.

Drought and Texas Water Resources David R. Maidment Center for Research in Water Resources University of Texas at Austin A presentation made to the Committee.

Aspects of a climate observing system: energy and water Kevin E Trenberth NCAR Kevin E Trenberth NCAR.

Alys Thomas Hydrology and Climate Research Group Dept. of Earth System Science University of California, Irvine 2013 AMS Annual Meeting, Austin Using the.

A better GRACE solution for improving the regional Greenland mass balance Z Xu 1, E.J.O Schrama 1, W. van der. Wal 1 1 Department of Astrodynamics and.

Global Warming And the Planetary Water Cycle Ruth Curry Woods Hole Oceanographic Institution Ruth Curry Woods Hole Oceanographic Institution Global Warming.

An Overview of the Observations of Sea Level Change R. Steven Nerem University of Colorado Department of Aerospace Engineering Sciences Colorado Center.

Progress in Geoid Modeling from Satellite Missions

   Alys Thomas 1, J.T. Reager 1,2, Jay Famiglietti 1,2,3, Matt Rodell 4 1 Dept. of Earth System Science, 2 UC Center for Hydrologic Modeling, 3 Dept.

Mercury Basic data North hemisphere South hemisphere from MESSENGER Basic data: Radius is 0.38 of Earth’s Mass is 0.06 of Earth’s Orbit has e=0.2, a=0.39AU.

Don Chambers Center for Space Research, The University of Texas at Austin Josh Willis Jet Propulsion Laboratory, California Institute of Technology R.

Catherine LeCocq SLAC USPAS, Cornell University Large Scale Metrology of Accelerators June 27 - July 1, 2005 Height Systems 1 Summary of Last Presentation.

Don P. Chambers College of Marine Science University of South Florida Measuring Mean Ocean Mass Variability with GRACE NASA Sea Level Workshop, Austin.

Towards a standard model for present-day signals due to postglacial rebound H.-P. Plag, C. Kreemer Nevada Bureau of Mines and Geology and Seismological.

GEOG 2007A An Introduction to Geographic Information SystemsFall, 2004 C. Earl Maps give us a wider view than we can normally see by shrinking a larger.

Antarctic ice mass change estimates from GRACE: Results, uncertainties, and the combination with complementary information Martin Horwath, Reinhard Dietrich.

OSTST Meeting, Hobart, Australia, March 12-15, 2007 On the use of temporal gravity field models derived from GRACE for altimeter satellite orbit determination.

J. Famiglietti with contributions from D. Chambers, K. Hilburn, S. Nerem, M. Rodell, T. Syed, S. Swenson, I. Velicogna, J. Wahr and J. Willis 2009 NASA.

AIRS Land Surface Temperature and Emissivity Validation Bob Knuteson Hank Revercomb, Dave Tobin, Ken Vinson, Chia Lee University of Wisconsin-Madison Space.

Last Time: Introduction to Gravity Governed by LaPlace’s equation: with solution of the form: If we have a spherical body with mass M and constant (or.

How Do we Estimate Gravity Field? Terrestrial data –Measurements of surface gravity –Fit spherical harmonic coefficients Satellite data –Integrate equations.

National Oceanic and Atmospheric Administration’s National Weather Service Colorado Basin River Forecast Center Salt Lake City, Utah 11 The Hydrologic.

Rapid core field variations just before Swarm

Analyzing Sea Level Rise Due to Melting of Antarctic Ice

Geodesy & Crustal Deformation

CMBR Kinematic Dipole Anisotropy (~300 km/s velocity toward Leo); map of the temperature fluctuation relative to the MEAN (black body with T=2.728 Kelvin)

Directions of Inquiry Given a fixed atmospheric CO2 concentration assimilation scheme, what is the optimal network expansion? Given the wide array of available.

Presentation transcript:

The Time-Variable Geoid Over North America from GRACE John Wahr, University of Colorado

The are Legendre functions. The, are Stokes coefficients. GRACE provides monthly coefficients to degree and order 60 (or greater). Large scales (small l) are more accurate than small scales (large l). 85 monthly fields, between April, 2002 and July, 2009, are now available. Mission expected to end around GRACE

To map the linear trend, fit a trend to each Stokes coefficient, and put those trends in here WlWl harmonic coefficients of a Gaussian smoothing function I’ve chosen a 300-km radius for the smoothing function.

Uses monthly GRACE fields from the Center for Space Research at U Texas. Complete through degree and order = 60. Fit to April, 2002 – June, 2009.

Questions: (1) Are these signals large enough to matter? (2) Is the 300-km smoothing masking out interesting signals? (3) Once GRACE is gone, will other data/models be able to give equivalent results?

Uses monthly GRACE fields from the Center for Space Research at U Texas. Complete through degree and order = 60. Fit to April, 2002 – June, Paulson et al (2007) PGR model has been removed. Implication: the PGR model seems to remove the PGR geoid signal to about mm/yr.

GRACE results (1)the signal in the southeastern US is not a true secular signal (probably true of most water storage signals). (2)the Alaskan glacier signal is closer to a secular signal,.

GRACEGLDAS/Noah Water Storage Model (Rodell et al 2004).

Secular Trend in Geoid From GLDAS/Noah Water Storage Model (Rodell et al 2004). unsmoothedsmoothed

The standard GRACE product has had atmospheric and oceanic models removed. What happens if those models are added back? Models added backNot added back

The standard GRACE product has had atmospheric and oceanic models removed. What happens if those models are added back? Models added backNot added back

Parts of Yellowstone are uplifting at up to several cm/yr. How large is the accompanying geoid change? Could GRACE see it? Yellowstone National Park

From Christine Puskas and Wu-Lung Chang at U Utah Suppose all of Yellowstone National Park is uplifting at 3 cm/yr. Suppose the uplift is not compensated, and that the density is 3 gm/cm 3. What would the geoid change look like?

Could GRACE see it?

End