Retrieving Groundwater Depletion and Drought in the Tigris‐Euphrates Basin Between 2003 and 2015

Chao, Nengfang; Luo, Zhicai; Wang, Zhengtao; Jin, Taoyong

doi:10.1111/gwat.12611

Cited by 34 publications

(26 citation statements)

References 38 publications

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“…The overall water storage anomalies in the ETB (Figure 2a) have a steeper trend line after 2007. Chao et al [96] found that the negative trend after the drought (2007-2015) was 3.6 times as large as before the drought (2002)(2003)(2004)(2005)(2006). Similarly, the drought pattern becomes stronger for the KAB, with 2010 as an exception.…”

Section: Changes In Total Water Storagementioning

confidence: 98%

Multiple Remotely Sensed Lines of Evidence for a Depleting Seasonal Snowpack in the Near East

2019

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The snow-fed river basins of the Near East region are facing an urgent threat in the form of declining water resources. In this study, we analyzed several remote sensing products (optical, passive microwave, and gravimetric) and outputs of a meteorological reanalysis data set to understand the relationship between the terrestrial water storage anomalies and the mountain snowpack. The results from different satellite retrievals show a clear signal of a depletion of both water storage and the seasonal snowpack in four basins in the region. We find a strong reduction in terrestrial water storage over the Gravity Recovery and Climate Experiment (GRACE) observational period, particularly over the higher elevations. Snow-cover duration estimates from Moderate Resolution Imaging Spectroradiometer (MODIS) products point towards negative and significant trends up to one month per decade in the current era. These numbers are a clear indicator of the partial disappearance of the seasonal snow-cover in the region which has been projected to occur by the end of the century. The spatial patterns of changes in the snow-cover duration are positively correlated with both GRACE terrestrial water storage decline and peak snow water equivalent (SWE) depletion from the ERA5 reanalysis. Possible drivers of the snowpack depletion are a significant reduction in the snowfall ratio and an earlier snowmelt. A continued depletion of the montane snowpack in the Near East paints a bleak picture for future water availability in this water-stressed region.

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Section: Changes In Total Water Storagementioning

confidence: 98%

Multiple Remotely Sensed Lines of Evidence for a Depleting Seasonal Snowpack in the Near East

2019

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“…Models developed by different approaches and processing strategies are also provided by other agencies, for example, the Astronomical Institute of the University of Bern (Meyer et al, ), the Delft Institute of Earth Observation and Space Systems (Farahani et al, ), the Groupe de Recherche de Geodesie Spatiale (Bruinsma et al, ), the Huazhong University of Science and Technology (HUST; Zhou, Luo, Zhou et al, ), the Institute of Geodesy and Geophysics, Chinese Academy of Sciences (Wang et al, ), the Institute of Theoretical Geodesy and Satellite Geodesy at the Graz University of Technology (ITSG; Klinger & Mayer‐Gürr, ), the Tongji University (Tongji; Chen et al, ), and the Wuhan University (Guo et al, ). These temporal gravity field models have been widely used in hydrology, oceanology, glaciology, meteorology, and seismology (e.g., Chao et al, ; Humphrey et al, ; Long et al, ; Pan et al, ; Tangdamrongsub et al, ; Tregoning et al, ; Zhou, Luo, Tangdamrongsub, et al, ; Zhou, Luo, Tangdamrongsub, et al, ).…”

Section: Introductionmentioning

confidence: 99%

A New Hybrid Processing Strategy to Improve Temporal Gravity Field Solution

Zhou

Luo

2019

JGR Solid Earth

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The way to reach the prelaunch baseline accuracy is still one of crucial issues for Gravity Recovery and Climate Experiment (GRACE) temporal gravity field model determination. In this work, two hybrid processing strategies are developed to improve the accuracy of GRACE temporal solution. One is for kinematic empirical parameters, the other is for arc‐specific parameters. These two hybrid processing strategies are compared with two solely processing strategies including filter predetermined strategy (FPS) and pure predetermined strategy (PPS). Assessing with a closed‐loop simulation study, the results demonstrate the outperformance of our hybrid processing strategies. Using GRACE Level 1B data, the GRACE monthly gravity field models HUST‐FPS‐PPS and HUST‐Grace2019 are, respectively, determined with the hybrid processing strategies, and they are compared with the solely solutions HUST‐FPS and HUST‐PPS. The comparison results demonstrate that (1) as for the kinematic empirical parameter, the hybrid processing strategy can retain the temporal signal but also reduce the noise level. For instance, the annual amplitudes over Amazon River Basin are 16.0 cm for HUST‐PPS, 19.1 cm for HUST‐FPS, and 19.4 cm for HUST‐FPS‐PPS. In contrast, the cumulative geoid difference of HUST‐FPS‐PPS reduces by 11% and 26%, when compared to HUST‐PPS and HUST‐FPS. (2) As for the arc‐specific parameters, the hybrid processing strategy also significantly improves the recovered monthly solution. Compare with Center for Space Research RL05 and HUST‐FPS‐PPS, the cumulative geoid difference of HUST‐Grace2019 reduces by 19% and 12%. The comparison results in spatial domain also support our conclusions. The hybrid processing strategy of this work is likely applicable for GRACE Follow‐On data.

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“…Therefore, groundwater storage changes (GWSC) can be separated from LWSC measures by combining the GRACE data and external information (see and Feng et al [2018] for a review on the use of GRACE for monitoring GWSC). The GRACE mission has proven to be a valuable tool for detecting GWSC at global (Richey et al 2015;Rodell et al 2018) and regional scales (∼160,000 km 2 ) (Rodell et al 2009a(Rodell et al , 2009bVoss et al 2013;Chao et al 2018).…”

Section: Introductionmentioning

confidence: 99%

“…Although there has been plenty of research using GRACE to explore GWSC in various river basins around the world, including the Amazon River Basin (South America) (Frappart et al 2019), Tigris-Euphrates Basin (Middle East) (Chao et al 2018), Congo Basin (Africa) (Ndehedehe et al 2018), Canning Basin (Australia) (Munier et al 2012), Colorado River Basin (USA) (Castle et al 2014), Mississippi River basin (USA) (Rodell et al 2007), and Yellow River Basin (China) (Lin et al 2019), there has seldom been any thorough assessment of GWSC in the Jinsha River Basin (JRB), which is located in the uppermost region of the Yangtze River, China.…”

Section: Introductionmentioning

confidence: 99%

Groundwater Storage Change in the Jinsha River Basin from GRACE, Hydrologic Models, and In Situ Data

Chao¹,

Chen

et al. 2019

Groundwater

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Groundwater plays a major role in the hydrological processes driven by climate change and human activities, particularly in upper mountainous basins. The Jinsha River Basin (JRB) is the uppermost region of the Yangtze River and the largest hydropower production region in China. With the construction of artificial cascade reservoirs increasing in this region, the annual and seasonal flows are changing and affecting the water cycles. Here, we first infer the groundwater storage changes (GWSC), accounting for sediment transport in JRB, by combining the Gravity Recovery and Climate Experiment mission, hydrologic models and in situ data. The results indicate: (1) the average estimation of the GWSC trend, accounting for sediment transport in JRB, is 0.76 ± 0.10 cm/year during the period 2003 to 2015, and the contribution of sediment transport accounts for 15%; (2) precipitation (P), evapotranspiration (ET), soil moisture change, GWSC, and land water storage changes (LWSC) show clear seasonal cycles; the interannual trends of LWSC and GWSC increase, but P, runoff (R), surface water storage change and SMC decrease, and ET remains basically unchanged; (3) the main contributor to the increase in LWSC in JRB is GWSC, and the increased GWSC may be dominated by human activities, such as cascade damming and climate variations (such as snow and glacier melt due to increased temperatures). This study can provide valuable information regarding JRB in China for understanding GWSC patterns and exploring their implications for regional water management.

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Retrieving Groundwater Depletion and Drought in the Tigris‐Euphrates Basin Between 2003 and 2015

Cited by 34 publications

References 38 publications

Multiple Remotely Sensed Lines of Evidence for a Depleting Seasonal Snowpack in the Near East

Multiple Remotely Sensed Lines of Evidence for a Depleting Seasonal Snowpack in the Near East

A New Hybrid Processing Strategy to Improve Temporal Gravity Field Solution

Groundwater Storage Change in the Jinsha River Basin from GRACE, Hydrologic Models, and In Situ Data

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