نتایج جستجو برای: the gravity recovery and climate experiment grace

تعداد نتایج: 21200198  

Journal: :Contributions to Geophysics and Geodesy 2021

Study presented in this paper is focused on comparison and statistical assessment of differences between the selected Level 2 products satellite mission Gravity Recovery Climate Experiment (GRACE). Global monthly gravity field models terms spherical harmonic coefficients produced by three institutes GRACE Science Data System are compared with partially independent MASCON global model. Detailed ...

2012
B. S. Sheard W. M. Folkner

The Gravity Recovery and Climate Experiment (GRACE) has demonstrated that low–low satellite-tosatellite tracking enables monitoring the time variations of the Earth’s gravity field on a global scale, in particular those caused by mass-transport within the hydrosphere. Due to the importance of long-term continued monitoring of the variations of the Earth’s gravitational field and the limited lif...

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 ...

Journal: :Remote Sensing 2017
Yunlong Wu Qian Zhao Bao Zhang Weiwei Wu

Complex tectonic and non-tectonic movements exist in the Tianshan area. However, we have not acquired good knowledge of such movements yet. In this study, we combine Global Positioning System (GPS), the Gravity Recovery and Climate Experiment (GRACE) and Surface Loading Models (SLMs) data to study the seasonal vertical crustal displacements in the Tianshan area. The results show that all three ...

2011
A.I.J.M. van Dijk L. J. Renzullo M. Rodell

Terrestrial water storage (TWS) estimates retrievals from the Gravity Recovery and Climate Experiment (GRACE) satellite mission were compared to TWS modeled by the Australian Water Resources Assessment (AWRA) system. The aim was to test whether differences could be attributed and used to identify model deficiencies. Data for 2003–2010 were decomposed into the seasonal cycle, linear trends and t...

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...

پایان نامه :0 1374

having conducted the experiment and analysed the data, the researcher computed the groups mean scores and variances for the test relating to the research question. as the final atep, a t-test was conodonted for the hypothesis. as noted earlier, the significance level was determined at .05 and .01 respectively. the observed t-value was higher than the critical t-value at. 5 and .01 levels. conse...

2017
R. Alkama B. Decharme H. Douville M. Becker A. Cazenave J. Sheffield A. Voldoire S. Tyteca P. Le Moigne R. ALKAMA B. DECHARME H. DOUVILLE A. CAZENAVE J. SHEFFIELD

In earth systemmodels, the partitioning of precipitation among the variations of continental water storage, evapotranspiration, and freshwater runoff to the ocean has a major influence on the terrestrial water and energy budgets and thereby on simulated climate on a wide range of scales. The evaluation of continental hydrology is therefore a crucial task that requires offline simulations driven...

Journal: :Remote Sensing 2021

Hydroclimatic extremes such as droughts and floods triggered by human-induced climate change are causing severe damage in the Nile River Basin (NRB). These hydroclimatic not well studied a holistic approach NRB. In this study, Gravity Recovery Climate Experiment (GRACE) mission its Follow on (GRACE-FO) derived indices other standardized computed for developing monitoring evaluation methods of f...

Journal: :Remote Sensing 2016
Alka Singh Florian Seitz Annette Eicker Andreas Güntner

The hydrological budget of a region is determined based on the horizontal and vertical water fluxes acting in both inward and outward directions. These integrated water fluxes vary, altering the total water storage and consequently the gravitational force of the region. The time-dependent gravitational field can be observed through the Gravity Recovery and Climate Experiment (GRACE) gravimetric...

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