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David M. Bjerklie, Thomas J. Trombley, and Roland J. Viger

future changes in groundwater recharge and snowfall resulting from climate change using output from a GCM to adjust input weather records ( Hay et al. 2011 ). The paper does not evaluate the quality of the future climate trends derived from the GCM, focusing on trends rather than absolute values of potential future changes in hydrologic quantities. The intent of the paper is to look specifically at the changes in groundwater recharge and snowfall that could result from climate change. The model

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Bailing Li, Matthew Rodell, Christa Peters-Lidard, Jessica Erlingis, Sujay Kumar, and David Mocko

soil moisture and groundwater storage using in situ soil moisture and well data to infer the day of seasonal maximum recharge and its irregularity. Long-term trends were calculated to explore the relationships between recharge and climate variables (precipitation and temperature). We describe the data and the methods for deriving recharge from LSMs in section 2 and present the results in section 3 . Section 4 contains discussions of model deficiencies in simulating soil moisture and

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Y. Govender, E. Cuevas, L. D. S. Sternberg, and M. R. Jury

spite of this, it is generally accepted that, once water enters the subsurface and is away from evaporative effects, δ 18 O and δD are conservative in their mixing relationships ( Craig 1961 ). By analyzing the natural variations of the oxygen and hydrogen isotope ratios in rainfall (δ 18 O and δD, respectively), researchers have been able to trace the origins of rainfall and groundwater recharge ( Rodriguez-Martínez 1997 ; Alyamani 2001 ; Bowen and Wilkinson 2002 ; Jones and Banner 2003 ; Rosen

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Kirk Zmijewski and Richard Becker

. 3.3. Groundwater trend Figure 7 shows the estimates of groundwater trends within the region. Locations of dams and reservoirs are shown for comparison. Groundwater recharge has increased in the central parts of basin and near agricultural areas most likely as a result of losses irrigation losses to groundwater. Many of the irrigation systems are unlined, which allows infiltration of some of the water through the bottom of ditches and furrows. Reservoirs may also increase recharge depending on

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Pennan Chinnasamy, Jason A. Hubbart, and Govindasamy Agoramoorthy

groundwater storage thickness using GRACE/GLDAS data for the northwest Indian state of Gujarat; 2) to validate GRACE/GLDAS results against quarterly averaged groundwater levels; 3) to identify spatial trends in groundwater storage/recharge across the state of Gujarat; and 4) to quantify temporal (monthly and seasonal) patterns in groundwater storage/recharge. We hypothesized that a positive trend between GRACE/GLDAS and recorded groundwater data will improve confidence in study results and therefore

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M. Sekhar, M. Shindekar, Sat K. Tomer, and P. Goswami

( Zekster and Loaiciga 1993 ; Allen et al. 2004 ; Green et al. 2007 ; Scibek et al. 2007 ), most of these are limited to impacts on recharge and discharge conditions in moderate/large size catchments. Hansen and Dettinger ( Hansen and Dettinger 2005 ) performed a study focusing on linkage between global-scale climate variations and local groundwater response for a coastal aquifer basin of Southern California. Simulations using multiple ensembles of the ECHAM-3.6 were explored by incorporating the

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Akarsh Asoka and Vimal Mishra

(2015) and Mishra et al. (2018) reported that groundwater abstraction for irrigation in Punjab is significantly higher than the groundwater recharge, which results in a rapid decline in groundwater storage in northwest India. Overall, both soil moisture and ET indicate the strong influence of crop growth on groundwater storage variability in India. Overall, NWI showed the negative relationship between ET and GWSA GRACE in both Rabi and Kharif seasons, which can be attributed to declining trends

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Guoyong Leng, Maoyi Huang, Qiuhong Tang, Huilin Gao, and L. Ruby Leung

United States is used. Fig . 5. Spatial distributions of (a) r grd and (b) r srf in percentages at the county scale. b. Effects of irrigation and groundwater withdrawal on terrestrial water and energy budgets Groundwater pumping for irrigation can perturb the surface water and energy balances through changes in ET, groundwater recharge, soil moisture, and other budget terms. Figure 6 shows the spatial distributions of annual mean water table depth [ (m)], potential recharge [PE (mm)], and

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Xueli Huo, Zhongfang Liu, Qingyun Duan, Pengmei Hao, Yanyan Zhang, Yonghong Hao, and Hongbin Zhan

upper carbonate aquifer in southern Manitoba in Canada. Hao et al. (2006) revealed that the continuous decline of water level in the karst aquifer of Liulin Springs might be largely attributed to the decline in regional precipitation over the past two decades. Lee et al. (2014) concluded that more abundant rainfall (from 2000 to 2010) in the wet season does not contribute significantly to groundwater recharge, whereas less rainfall that occurs in the dry season can cause a decrease in the

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Pat J-F. Yeh and Elfatih A. B. Eltahir

the LSXGW model, and how it may impact the macroscale hydrological fluxes. a. The representation of subgrid heterogeneity of WTD in groundwater runoff In Part I , the unconfined aquifer was represented as a lumped reservoir as follows: where S y is the specific yield of the unconfined aquifer, H is the water table level above the datum, I gw is the groundwater recharge flux, and Q gw is the groundwater discharge to streams. Recall that the observations indicate a strong nonlinear

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