نتایج جستجو برای: grace potential changes

تعداد نتایج: 1847570  

ژورنال: ژئوفیزیک ایران 2018

Space-borne gravity data from Gravity Recovery and Climate Experiment (GRACE), as well as some other in situ and remotely sensed satellite data have been used to determine water storage changes in Lake Urmia Basin (Iran). As usual, the GRACE products are derived from precise inter-satellite range rate measurements converted to different formats such as spherical harmonic coefficients and equiva...

Journal: :Cancer detection and prevention 2005
Dejana Braithwaite Stephen Sutton James Mackay Judith Stein Jon Emery

BACKGROUND Innovative technologies that enable the collection of family history information and the assessment of breast cancer risk have a potential to enhance the quality of preventive care. We developed a computerized tool that supports stratification of breast cancer risk, genetic risk assessment in the clinical environment (GRACE). METHODS In a preliminary evaluation of the tool's impact...

2009
J. L. Chen C. R. Wilson B. D. Tapley Z. L. Yang G. Y. Niu

[1] Satellite gravity measurements from the Gravity Recovery and Climate Experiment (GRACE) provide new quantitative measures of the 2005 extreme drought event in the Amazon river basin, regarded as the worst in over a century. GRACE measures a significant decrease in terrestrial water storage (TWS) in the central Amazon basin in the summer of 2005, relative to the average of the 5 other summer...

2010
J. L. Chen C. R. Wilson B. D. Tapley L. Longuevergne Z. L. Yang B. R. Scanlon

[1] The Gravity Recovery and Climate Experiment (GRACE) provides quantitative measures of terrestrial water storage (TWS) change. GRACE data show a significant decrease in TWS in the lower (southern) La Plata river basin of South America over the period 2002–2009, consistent with recognized drought conditions in the region. GRACE data reveal a detailed picture of temporal and spatial evolution ...

2016
Yuanjin Pan Wenbin Shen Cheinway Hwang Chao-Ming Liao Tengxu Zhang Guoqing Zhang

Surface vertical deformation includes the Earth's elastic response to mass loading on or near the surface. Continuous Global Positioning System (CGPS) stations record such deformations to estimate seasonal and secular mass changes. We used 41 CGPS stations to construct a time series of coordinate changes, which are decomposed by empirical orthogonal functions (EOFs), in northeastern Tibet. The ...

2003
S. - C. Han C. Jekeli

The gravity field dedicated satellite missions like CHAMP, GRACE, and GOCE are supposed to map the Earth’s global gravity field with unprecedented accuracy and resolution. New models of Earth’s static and time-variable gravity field will be available every month as one of the science products from GRACE. Here we present an alternative method to estimate the gravity field efficiently using the i...

2013
Di Long Bridget R. Scanlon Laurent Longuevergne Alexander Y. Sun D. Nelun Fernando Himanshu Save

[1] Texas experienced the most extreme one-year drought on record in 2011 with precipitation at 40% of long-term mean and agricultural losses of ~$7.6 billion. We assess the value of Gravity Recovery and Climate Experiment (GRACE) satellite-derived total water storage (TWS) change as an alternative remote sensing-based drought indicator, independent of traditional drought indicators based on in...

Journal: :Remote Sensing 2017
Alexander Y. Sun Bridget R. Scanlon Amir Aghakouchak Zizhan Zhang

Global assessment of the spatiotemporal variability in terrestrial total water storage anomalies (TWSA) in response to hydrologic extremes is critical for water resources management. Using TWSA derived from the gravity recovery and climate experiment (GRACE) satellites, this study systematically assessed the skill of the TWSA-climatology (TC) approach and breakpoint (BP) detection method for id...

Journal: :Science 2006
Shin-Chan Han C K Shum Michael Bevis Chen Ji Chung-Yen Kuo

We report the detection of an earthquake by a space-based measurement. The Gravity Recovery and Climate Experiment (GRACE) satellites observed a +/-15-microgalileo gravity change induced by the great December 2004 Sumatra-Andaman earthquake. Coseismic deformation produces sudden changes in the gravity field by vertical displacement of Earth's layered density structure and by changing the densit...

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