scholarly journals Corrigendum to “Groundwater storage changes in the Tibetan Plateau and adjacent areas revealed from GRACE satellite gravity data” [Earth Planet. Sci. Lett. 449 (2016) 228–239]

2016 ◽  
Vol 452 ◽  
pp. 309 ◽  
Author(s):  
L. Xiang ◽  
H. Wang ◽  
H. Steffen ◽  
P. Wu ◽  
L. Jia ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Gravity Data ◽  
The Tibetan Plateau ◽  
Earth Planet ◽  
Groundwater Storage ◽  
Satellite Gravity ◽  
Grace Satellite

scholarly journals Groundwater storage changes in the Tibetan Plateau and adjacent areas revealed from GRACE satellite gravity data

2016 ◽  
Vol 449 ◽  
pp. 228-239 ◽  
Author(s):  
Longwei Xiang ◽  
Hansheng Wang ◽  
Holger Steffen ◽  
Patrick Wu ◽  
Lulu Jia ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Gravity Data ◽  
The Tibetan Plateau ◽  
Groundwater Storage ◽  
Satellite Gravity ◽  
Grace Satellite

scholarly journals Monitoring mass changes in the Volta River basin using GRACE satellite gravity and TRMM precipitation

2012 ◽  
Vol 18 (4) ◽  
pp. 549-563 ◽  
Author(s):  
Vagner G. Ferreira ◽  
Zheng Gong ◽  
Samuel A. Andam-Akorful
Keyword(s):  
River Basin ◽  
Gravity Data ◽  
West African ◽  
Rainfall Time Series ◽  
Tropical Rainfall Measurement Mission ◽  
Satellite Gravity ◽  
Rainfall Events ◽  
The North ◽  
Trmm Precipitation ◽  
Grace Satellite

GRACE satellite gravity data was used to estimate mass changes within the Volta River basin in West African for the period of January, 2005 to December, 2010. We also used the precipitation data from the Tropical Rainfall Measurement Mission (TRMM) to determine relative contributions source to the seasonal hydrological balance within the Volta River basin. We found out that the seasonal mass change tends to be detected by GRACE for periods from 1 month in the south to 4 months in the north of the basin after the rainfall events. The results suggested a significant gain in water storage in the basin at reference epoch 2007.5 and a dominant annual cycle for the period under consideration for both in the mass changes and rainfall time series. However, there was a low correlation between mass changes and rainfall implying that there must be other processes which cause mass changes without rainfall in the upstream of the Volta River basin.

scholarly journals Quantifying streamflow and active groundwater storage in response to climate warming in an alpine catchment on the Tibetan Plateau

2018 ◽  
Author(s):  
Lu Lin ◽  
Man Gao ◽  
Jintao Liu ◽  
Xi Chen ◽  
Hu Liu
Keyword(s):  
Tibetan Plateau ◽  
Climate Warming ◽  
Storage Capacity ◽  
Flow Analysis ◽  
Summer Rainfall ◽  
Dominant Factor ◽  
The Tibetan Plateau ◽  
Early Winter ◽  
Frozen Ground ◽  
Groundwater Storage

Abstract. Climate warming is changing streamflow regimes and groundwater storage in cold alpine regions. In this study, a headwater catchment named Yangbajain in the Lhasa River basin on the Tibetan Plateau is adopted as the study area for quantifying streamflow changes and active groundwater storage in response to climate warming. The catchment is characterized by alpine glacier and frozen ground which covers about 11 % and 86 % of the total area, respectively. The changes in streamflow regimes (including quickflow and baseflow) and climate factors are evaluated based on hydro-meteorological observations from 1979 to 2013. Then active groundwater storage in autumn and early winter is quantified by recession flow analysis assuming nonlinearized outflow from aquifers into streams. The results show that annual streamflow increases significantly at a rate of about 12.30 mm/10a during this period. The significant increase of annual air temperature compared with nonsignificant variation of annual precipitation indicates that the climate warming takes responsibilities to the increase of streamflow. It is believed that the increased streamflow is mainly fed by glacier meltwater, which has led to over 25 % loss of the total glacial volume in the past 50 years (1960–2009) in this catchment. Moreover, the significant increase of annual baseflow at a rate of about 10.95 mm/10a is the dominant factor for the increase of the total streamflow. Through recession flow analysis, we find that recession coefficient K and active groundwater storage S in autumn and early winter increase significantly at the rates of about 7.70 (mm0.79d−0.21)/10a and 19.32 mm/10a during these years. The increase of active groundwater storage can partly be explained by frozen ground degradation, which lead to the enlargement of groundwater storage capacity and accommodate more summer rainfall and meltwater in the wide and flat valley, and then slowly release them into streams in the following seasons. Thus, it is reasonable to attribute the increase of baseflow and the slowdown of baseflow recession process in autumn and early winter to the enlargement of groundwater storage capacity. Through quantifying streamflow changes and active groundwater storage in response to warming-induced changes, this study provides a perspective to clarify the way of glacial retreat and frozen ground degradation on hydrological processes.

scholarly journals Improvement of Downward Continuation Values of Airborne Gravity Data in Taiwan

2018 ◽  
Vol 10 (12) ◽  
pp. 1951 ◽  
Author(s):  
Qilong Zhao ◽  
Xinyu Xu ◽  
Rene Forsberg ◽  
Gabriel Strykowski
Keyword(s):  
Tibetan Plateau ◽  
Gravity Data ◽  
Parametric Method ◽  
Downward Continuation ◽  
Airborne Gravity ◽  
Mountainous Area ◽  
The Tibetan Plateau ◽  
Random Errors ◽  
Airborne Gravity Survey ◽  
The Difference

An airborne gravity survey was carried out to fill gaps in the gravity data for the mountainous areas of Taiwan. However, the downward continuation error of airborne gravity data is a major issue, especially in regions with complex terrain, such as Taiwan. The root mean square (RMS) of the difference between the downward continuation values and land gravity was approximately 20 mGal. To improve the results of downward continuation we investigated the inverse Poisson’s integral, the semi-parametric method combined with regularization (SPR) and the least-squares collocation (LSC) in this paper. The numerically simulated experiments are conducted in the Tibetan Plateau, which is also a mountainous area. The results show that as a valuable supplement to the inverse Poisson’s integral, the SPR is a useful approach to estimate systematic errors and to suppress random errors. While the LSC approach generates the best results in the Tibetan Plateau in terms of the RMS of the downward continuation errors. Thus, the LSC approach with a terrain correction (TC) is applied to the downward continuation of real airborne gravity data in Taiwan. The statistical results show that the RMS of the differences between the downward continuation values and land gravity data reduced to 11.7 mGal, which shows that an improvement of 40% is obtained.

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