Publications related to the GRACE Missions (no abstracts)

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Seasonal Hydrological Loading in Southern Tibet Detected by Joint Analysis of GPS and GRACE

Zou, Rong, Wang, Qi, Freymueller, Jeffrey T., Poutanen, Markku, Cao, Xuelian, Zhang, Caihong, Yang, Shaomin, and He, Ping, 2015. Seasonal Hydrological Loading in Southern Tibet Detected by Joint Analysis of GPS and GRACE. Sensors, 15(12):30525–30538, doi:10.3390/s151229815.

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@ARTICLE{2015Senso..1530525Z,
       author = {{Zou}, Rong and {Wang}, Qi and {Freymueller}, Jeffrey T. and {Poutanen}, Markku and {Cao}, Xuelian and {Zhang}, Caihong and {Yang}, Shaomin and {He}, Ping},
        title = "{Seasonal Hydrological Loading in Southern Tibet Detected by Joint Analysis of GPS and GRACE}",
      journal = {Sensors},
     keywords = {seasonal variations, GRACE, GPS, vertical deformation, horizontal deformation},
         year = 2015,
        month = dec,
       volume = {15},
       number = {12},
        pages = {30525-30538},
     abstract = "{In southern Tibet, ongoing vertical and horizontal motions due to the
        collision between India and Eurasia are monitored by large
        numbers of global positioning system (GPS) continuous and
        campaign sites installed in the past decade. Displacements
        measured by GPS usually include tectonic deformation as well as
        non-tectonic, time-dependent signals. To estimate the regional
        long-term tectonic deformation using GPS more precisely,
        seasonal elastic deformation signals associated with surface
        loading must be removed from the observations. In this study, we
        focus on seasonal variation in vertical and horizontal motions
        of southern Tibet by performing a joint analysis of GRACE
        (Gravity Recovery and Climate Experiment) and GPS data, not only
        using continuous sites but also GPS campaign-mode sites. We
        found that the GPS-observed and GRACE-modeled seasonal
        oscillations are in good agreements, and a seasonal displacement
        model demonstrates that the main reason for seasonal variations
        in southern Tibet is from the summer monsoon and its
        precipitation. The biggest loading appears from July to August
        in the summer season. Vertical deformations observed by GPS and
        modeled by GRACE are two to three times larger than horizontal
        oscillations, and the north components demonstrate larger
        amplitudes than the east components. We corrected the GPS
        position time series using the GRACE-modeled seasonal
        variations, which gives significant reductions in the misfit and
        weighted root-mean-squares (WRMS). Misfit ( {\ensuremath{\chi}}
        2 divided by degree of freedom) reductions for campaign sites
        range between 20\% and 56\% for the vertical component, and are
        much smaller for the horizontal components. Moreover, time
        series of continuous GPS (cGPS) sites near the 2015 Nepal
        earthquakes must be corrected using appropriate models of
        seasonal loading for analyzing postseismic deformation to avoid
        biasing estimates of the postseismic relaxation.}",
          doi = {10.3390/s151229815},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2015Senso..1530525Z},
      adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}

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