Seasonal Variation of Terrestrial Water Storage in Yunnan Province Inferred from GPS Vertical Observations

doi:10.11947/j.AGCS.2018.20170255

Abstract

Abstract: In response to the mass redistribution on the surface of the earth,crustal vertical displacements are deformed in solid elastic earth,which can be recorded by continuous GPS.With GPS vertical observations at 47 stations from crustal movement observation network of China (CMONOC) in and around Yunnan province,we explore the feasibility analysis of using the data to infer the variation of water storage.Simulation experiments are conducted by using GLDAS (global land data assimilation system) Noah hydrological model,whose annual amplitude is referred as real signals.We used the GLDAS annual amplitude to calculate the vertical displacements,and combined the displacements with random errors to constitute simulated vertical displacements.The simulated vertical displacements are then converted to variation of water storage,which is compared with the original GLDAS water storage.We performed 1000 simulated experiments to evaluate robustness of the method,and it is evident that the variation of water storage could be effectively obtained by means of the vertical observations at the 47 CMONOC stations.Therefore,we investigated the variation of water storage over a period from 2010 to 2014.Results inferred from GPS data show obvious spatial and temporal distribution:the seasonal water in the southwestern mountain is much larger than that in eastern plain;the water storage reaches the maximum in October (after summer) and the minimum in April (after winter);a rate of 20 mm/a in total water storage in Yunnan province is presented during 2010-2014.The comparison between GPS-inferred water storage and GRACE,GLDAS and TRMM results showed good consistency in spatial and temporal distribution,indicating that CMONNOC GPS stations could be used as independent measurement to estimate terrestrial water storage changes during the gap between GRACE and future GRACE Follow-on missions.

Key words: GPS, terrestrial water storage, GRACE, loading deformation

CLC Number:

P223

HE Siyuan, GU Yanchao, FAN Dongming, ZHAO Hongbin, ZHENG Rong. Seasonal Variation of Terrestrial Water Storage in Yunnan Province Inferred from GPS Vertical Observations[J]. Acta Geodaetica et Cartographica Sinica, 2018, 47(3): 332-340.

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