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2025

 

61.Tomar, S.*, D.R. Hirmas, R.C. Graham, M. Cole, H. Ajami, A. Frisbie, A.B. Gray, E. Blake. 2025. Soil Development Along An Elevational Transect in the Arid White Mountains, California, Soil Science Society of America Journal, 89, e70083. https://doi.org/10.1002/saj2.70083

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60. Singh, N.K., S.M. Saia, R. Bhattacharya, H. Ajami, D.M. Borrok. 2025. Unraveling the Causal Influences of Drought and Crop Production on Groundwater Levels Across the Contiguous United States, PNAS Nexus, https://doi.org/10.1093/pnasnexus/pgaf129

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​59. Nimmo, J. R., I. Wiekenkamp, R. Araki, J. Groh, N.K. Singh, O. Crompton, B.M. Wyatt, H. Ajami, D. Giménez, D.R. Hirmas, P.L. Sullivan, M. Sprenger. 2025. Identifying Preferential Flow From Soil Moisture Time Series: Review of Methodologies. Vadose Zone Journal, 24, e70017. https://doi.org/10.1002/vzj2.70017

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58. Acero Triana, J.S.*, H. Ajami. S. Razavi. The Dilemma of Objective Function Selection for Sensitivity and Uncertainty Analyses of Semi-Distributed Hydrologic Models Across Spatial and Temporal Scales, Journal of Hydrology, https://doi.org/10.1016/j.jhydrol.2024.132482

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2024

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57. Jarecke, K.M., X. Zhang, R.M. Keen, M. Dumont, B. Li, K. Sadayappan, V. Moreno, H. Ajami, S.A. Billings, A.N. Flores, D.R. Hirmas, M.F. Kirk, L. Li, J. B. Nippert, K. Singha, P.L. Sullivan. Woody Encroachment Modifies Subsurface Structure and Hydrological Function, Ecohydrology, https://doi.org/10.1002/eco.2731

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56. Dhungel, R., R.G. Anderson, A.N. French,  T.H. Skaggs, H. Ajami, D. Wang. 2024. Intercomparison of Citrus Evapotranspiration Among Eddy Covariance, OpenET Ensemble Models, and the Water and Energy Balance Model (BAITSSS). Agricultural Water Management, 304, 109066. https://doi.org/10.1016/j.agwat.2024.109066

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55. Armengol, S.*, H. Ajami, J.S. Acero Triana, J. O. Sickman, L. Ortega. 2024. Isogeochemical Characterization of Mountain System Recharge Processes in the Sierra Nevada, California. Water Resources Research, 60, e2023WR035719. https://doi.org/10.1029/2023WR035719

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54. Meles, M.B., S. Bradford, A. Casillas-Trasvina, L. Chen*, G. Osterman, T. Hatch, H. Ajami, O. Crompton, L. Levers, I. Kisekka. 2024. Uncovering the Gaps in Managed Aquifer Recharge for Sustainable Groundwater Management: A Focus on Hillslopes and Mountains. Journal of Hydrology. https://doi.org/10.1016/j.jhydrol.2024.131615

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53. Meles, M.B., L. Chen*, C. Unkrich, H. Ajami, S. Bradford, J. Šimůnek, D.C. Goodrich. 2024. Computationally Efficient Watershed-Scale Hydrological Modeling: Integrating HYDRUS-1D and KINEROS2 for Coupled Surface-Subsurface Analysis. Journal of Hydrology. https://doi.org/10.1016/j.jhydrol.2024.131621

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​52. Zipper, S., A. Brookfield, H. Ajami, J.R. Ayers, C. Beightel, M.N. Fienen, T. Gleeson,  J. Hammond,  M. Hill,  A.D. Kendall,  B. Kerr,  D. Lapides,  M. Porter,  S. Parimalarenganayaki,  M.M. Rohde,  C. Wardropper. 2024. Streamflow Depletion Caused by Groundwater Pumping: Fundamental Research Priorities for Management-relevant Science. Water Resources Research, 60, e2023WR035727. https://doi.org/10.1029/2023WR035727

 

51. Yuan, Y.*, L. Wang, Z. Wei, H. Ajami, H. Wang, T. Du. 2024. Using Median Point in Keeling Plot to Reduce the Uncertainty of the Isotopic Composition of Evapotranspiration. Journal of Hydrometeorology. https://doi.org/10.1175/JHM-D-23-0133.1

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50. Duro, A. M.*, D.R. Hirmas, H. Ajami, S.A. Billings, X. Zhang, L. Li, A. Flores, V. Moreno, X. Cao, J. Guilinger, E. Oleghe, D. Giménez, A. Gray, P.L. Sullivan. 2024. Topographic Correction of Visible Near-Infrared Reflectance Spectra for Horizon-Scale Soil Organic Carbon Mapping. Soil Science Society of America Journal, 00, 00–00. https://doi.org/10.1002/saj2.20612

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49. Chen, L.*, J. Šimůnek, S.A. Bradford, H. Ajami, M.B. Meles. 2023. Coupling Water, Solute, and Sediment Transport into a New Computationally Efficient Hydrologic Model. Journal of Hydrology. https://doi.org/10.1016/j.jhydrol.2023.130495

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2023

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48. Lee, S.*, H. Ajami.2023. Comprehensive Assessment of Baseflow Responses to Long-term Meteorological Droughts across the United States. Journal of Hydrology. https://doi.org/10.1016/j.jhydrol.2023.130256

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  • Rivers may not recover from drought for years (UCR press release) 

  • River recovery from drought can take years (AGU Eos)

  • River recoveries can take years due to prolonged drought, lack of rain, study shows (Nature World News)

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47. Koop, A.N., D.R. Hirmas, S.A. Billings, L. Li, A. Cueva, X. Zhang, H. Wen, A. Nemes, L.F.T. Souza, H. Ajami, A.N. Flores, A.K. Rudick, A. Guthrie, L.M. Klamm, M. Unruh, P.L. Sullivan.2023. Is Macroporosity Controlled by Complexed Clay and Soil Organic Carbon? Geoderma 437, 116565. https://doi.org/10.1016/j.geoderma.2023.116565

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46. Brookfield, A.E., S. Zipper, A.D. Kendall, H. Ajami, J.M. Deines. 2023. Estimating Groundwater Pumping for Irrigation - A Method Comparison. Groundwater. https://doi.org/10.1111/gwat.13336

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45. Souza, L.F.T., D.R. Hirmas, P.L. Sullivan, D.C. Reuman, M.F. Kirk, L. Li, H. Ajami, H. Wen, M.V.M. Sarto, T.D. Loecke, A.K. Rudick, C.W. Rice, S.A. Billings. 2023. Root Distributions, Precipitation, and Soil Structure Converge to Govern Soil Organic Carbon Depth Distributions. Geoderma. 437, 116569.https://doi.org/10.1016/j.geoderma.2023.116569

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44. Brookfield, A.E., H. Ajami, R.W.H. Carroll, C. Tague, P.L. Sullivan, L.E. Condon.2023. Recent advances in integrated hydrologic models: Integration of new domains. Journal of Hydrology. 620, 129515. https://doi.org/10.1016/j.jhydrol.2023.129515

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43. Aiken, M.L., C.E. Pace, M. Ramachandran, K.A. Schwabe, H. Ajami, B.G. Link, S.C. Ying. 2023. Disparities in Drinking Water Manganese Concentrations in Domestic Wells and Community Water Systems in the Central Valley, CA, USA. Environmental Science and Technology. 57, 1987–1996. https://doi.org/10.1021/acs.est.2c08548

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2022

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42. Chen, L.*, J. Šimůnek, S.A. Bradford, H. Ajami, M.B. Meles. 2022. A Computationally Efficient Hydrologic Modeling Framework to Simulate Surface-Subsurface Hydrological Processes at the Hillslope Scale. Journal of Hydrology. https://doi.org/10.1016/j.jhydrol.2022.128539

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41. Stephens, C. M., L.A. Marshall, F.M. Johnson, H. Ajami, L. Lin, L.E.  Band. 2022. Spatial Variation in Catchment Response to Climate Change Depends on Lateral Moisture Transport and Nutrient Dynamics. Water Resources Research, 58, e2021WR030577. https://doi.org/10.1029/2021WR030577

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40. Acero Triana, J. S.*, H. Ajami. 2022. Identifying Major Hydrologic Change Drivers in a Highly Managed Transboundary Endorheic Basin: Integrating Hydro-ecological Models and Time-Series Data Mining Techniques. Water Resources Research, 58, e2022WR032281. https://doi.org/10.1029/2022WR032281

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39. Wen, H., P.L. Sullivan, S.A. Billings, H. Ajami, A. Cueva, A. Flores, D.R. Hirmas, A.N. Koop, K. Murenbeeld, X. Zhang, L. Li.2022. From Soils to Streams: Connecting Terrestrial Carbon Transformation, Chemical Weathering, and Solute Export Across Hydrological Regimes. Water Resources Research, 58, e2022WR032314. https://doi.org/10.1029/2022WR032314

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38. Schreiner-McGraw, A. P.*, H. Ajami, R.G. Anderson, D. Wang. 2022. Integrating Partitioned Evapotranspiration Data into Hydrologic Models: Vegetation Parameterization and Uncertainty Quantification of Simulated Plant Water Use. Hydrological Processes, 36(6), e14580. https://doi.org/10.1002/hyp.14580

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37. Bradly, T., H. Ajami, W. Porter. 2022. Ecological Transitions at the Salton Sea: Past, Present and Future, California Agriculture, https://calag.ucanr.edu/archive/?article=ca.2022a0004

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36. Zipper, S.C., W.H. Farmer, A. Brookfield, H. Ajami, H.W. Reeves, C. Wardropper, J.C. Hammond, T. Gleeson, J.M. Deines. 2022. Quantifying Streamflow Depletion from Groundwater Pumping: A Practical Review of Past and Emerging Approaches for Water Management, Journal of the American Water Resources Association, https://onlinelibrary.wiley.com/doi/full/10.1111/1752-1688.12998

 

35. Schreiner-McGraw, A*, H. Ajami.2022. Combined Impacts of Uncertainty in Precipitation and Air Temperature on Simulated Mountain System Recharge from an Integrated Hydrologic Model, Hydrology & Earth System Sciences, https://hess.copernicus.org/preprints/hess-2020-558/

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34. Sullivan, P.L., S. Billings, D. Hirmas, L. Li, X. Zhang, S. Ziegler, K. Murenbeeld, H. Ajami, A. Guthrie, K. Singha, D. Giménez, A. Duro, V. Moreno, A. Flores, A. Cueva,  Koop, E.L. Aronson, H.R. Barnard, S.A. Banwart, R.M. Keen, A. Nemes, N.P. Nikolaidis, J.B. Nippert, D. Richter, D.A. Robinson, K. Sadayappan, L.F.T. de Souza, M. Unruh, H. Wen. 2022. Embracing the Dynamic Nature of Soil Structure: A Paradigm Illuminating the Role of Life in Critical Zones of the Anthropocene, Earth-Science Reviews, https://doi.org/10.1016/j.earscirev.2021.103873.

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33. Cowger, W.C., A. Gray, H. Hapich, J. Osei-Enin, B. Huynh, H. Nogi, S. Singh, S. Brownlee, J. Fong, T. Lok, G. Singer, H. Ajami.2022. Litter Origins, Accumulation Rates, and Hierarchical Composition on Urban Roadsides of the Inland Empire, California, Environmental Research Letters, https://iopscience.iop.org/article/10.1088/1748-9326/ac3c6a/meta 

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2021

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32. Schreiner-McGraw, A.*, H. Ajami.2021. Delayed Response of Groundwater to Multi-year Meteorological Droughts in the Absence of Anthropogenic Management, Journal of Hydrology, https://www.sciencedirect.com/science/article/pii/S0022169421009677?dgcid=coauthor

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2020

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31. Schreiner-McGraw, A.*, H. Ajami.2020. Impact of Uncertainty in Precipitation Forcing Datasets on the Hydrologic Budget of an Integrated Hydrologic Model in Mountainous Terrain, Water Resources Research, https://doi.org/10.1029/2020WR027639

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30. Kim, S., H. Ajami, A. Sharma. 2020. Using Remotely Sensed Information to Improve Vegetation Parameterization in a Semi-distributed Hydrological Model (SMART) for Upland Catchments in Australia, Remote Sensing, http://dx.doi.org/10.3390/rs12183051

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29. Stephens, C. M., L.A. Marshall, F.M. Johnson, L. Lin, L.E. Band, and H. Ajami. 2020. Is Past Variability a Suitable Proxy for Future Change? A Virtual Catchment Experiment, Water Resources Research, 56, https://doi.org/10.1029/2019WR026275

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28. Schreiner-McGraw*, A., E.R. Vivoni, H. Ajami, O.E. Sala, H.L. Throop, D.P.C. Peters.2020. Woody Plant Encroachment has a Larger Impact than Climate Change on Dryland Water Budgets, Scientific Reports, https://doi.org/10.1038/s41598-020-65094-x

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2019

 

27. Schreiner-McGraw*, A., H. Ajami, E. Vivoni.2019. Extreme Weather Events and Transmission Losses in Arid Streams, Environmental Research Letters, doi: 10.1088/1748-9326/ab2949

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26. Tang, Y., L. Marshall, A. Sharma, H. Ajami, D.J. Nott. 2019. Ecohydrologic Error Models for Improved Bayesian Inference in Remotely Sensed Catchments, Water Resources Research, https://doi.org/10.1029/2019WR025055

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25. Fan, Y., M. Clark, D. M. Lawrence, S. Swenson, L. E. Band, S. L. Brantley, P. D. Brooks, W. E. Dietrich, A. Flores, G. Grant, J. W. Kirchner, D. S. Mackay, J. J. McDonnell, P. C. D. Milly, P. L. Sullivan, C. Tague, H. Ajami, N. Chaney, A. Hartmann, P. Hazenberg, J. McNamara, J. Pelletier, J. Perket, E. Rouholahnejad-Freund, T. Wagener, X. Zeng, E. Beighley, J. Buzan, M Huang, B. Livneh, B. P. Mohanty, B. Nijssen, M. Safeeq, C. Shen, W. van Verseveld, J. Volk, D Yamazaki. 2019. Hillslope Hydrology in Global Change Research and Earth System Modeling, Water Resources Research, https://doi.org/10.1029/2018WR023903

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2018

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24. Tang, Y., L. Marshall, A. Sharma, H. Ajami. 2018. Modelling Precipitation Uncertainties in a Multi-objective Bayesian Ecohydrological Setting, Advances in Water Resources, https://doi.org/10.1016/j.advwatres.2018.10.015

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23. Ajami, H., A. Sharma. 2018. Disaggregating Soil Moisture to Finer Spatial Resolutions - A Comparison of Alternatives, Water Resources Research, https://doi.org/10.1029/2018WR022575

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22. Sandoval, E., G. Baldo, N., Núñez, J., Oyarzún, J.P. Fairley, H. Ajami, J.L. Arumí, E. Aguirre, H. Maturana, R. Oyarzún. 2018. Groundwater Recharge Assessment in a Rural, Arid, Mid-mountain Basin in North-Central Chile, Hydrological Sciences Journal, 63(13-14),1873-1889, https://doi.org/10.1080/02626667.2018.1545095

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21. Khan, U., H. Ajami, N.K. Tuteja, A. Sharma, S. Kim. 2018. Catchment Scale Simulations of Soil Moisture Dynamics Using an Equivalent Cross-Section based Hydrological Modelling Approach, Journal of Hydrology. https://doi.org/10.1016/j.jhydrol.2018.07.066

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20. Tang, Y., L. Marshall, A. Sharma, H. Ajami. 2018. A Bayesian Alternative for Multi-objective Ecohydrological Model Specification, Journal of Hydrology, https://doi.org/10.1016/j.jhydrol.2017.07.040

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2017

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19. Niraula, R., T. Meixner, F. Dominguez, N. Bhattarai, M. Rodell, H. Ajami, D. Gochis, C. Castro. 2017. How Might Recharge Change Under Projected Climate Change in the Western US?, Geophysical Research Letters, doi:10.1002/2017GL075421

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18. Niraula, R., T, Meixner, H. Ajami, M. Rodell, D. Gochis, C.L. Castro. 2017. Comparing Potential Recharge Estimates from Three Land Surface Models across the Western US​, Journal of Hydrology, http://dx.doi.org/10.1016/j.jhydrol.2016.12.028

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17. Gemitzi, A., H. Ajami, H. Richnow. 2017. Developing Empirical Monthly Groundwater Recharge Equations based on Modeling and Remote Sensing Data - Modeling Future Groundwater Recharge to Predict Potential Climate Change Impacts​, Journal of Hydrology, http://dx.doi.org/10.1016/j.jhydrol.2017.01.005

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16. Ajami, H., A. Sharma, L.E. Band, J.P. Evans, N. K. Tuteja, G.E. Amirthanathan, M.A. Bari. 2017. On the Non-stationarity of Hydrological Response in Anthropogenically Unaffected Catchments: An Australian Perspective, Hydrology and Earth System Sciences, doi:10.5194/hess-21-281-2017

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2016

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15. Ajami, H., U. Khan, N.K. Tuteja, A. Sharma. 2016. Development of a Computationally Efficient Semi-distributed Hydrologic Modeling Application for Soil Moisture, Lateral Flow and Runoff Simulation, Environmental Modelling & Software. doi: 10.1016/j.envsoft.2016.09.002

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14. Meixner, T., A. Manning, D. Stonestrom, D.M. Allen, H. Ajami, K. Blasch, A. Brookfield, C.L. Castro,  J.F. Clark, D. Gochis, A. Flint, K. Neff, R. Niraula, M. Rodell, B. Scanlon, K. Singha, M. Walvoord. 2016. Implications of Prospective Climate Change for Groundwater Recharge in the Western United States, Journal of Hydrology, doi:10.1016/j.jhydrol.2015.12.027

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13. Naseem, B., H. Ajami, Y. Liu, I. Cordery, A. Sharma. 2016. Multi-objective Assessment of Three Remote Sensing Vegetation Products for Streamflow Prediction in a Conceptual Ecohydrological Model, Journal of Hydrology, doi:10.1016/j.jhydrol.2016.10.038

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2015

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12. Ajami, H., M.F. McCabe, J.P. Evans. 2015. Impacts of Model Initialization on an Integrated Surface Water–Groundwater Model, Hydrological Processes, 29(17):3790-3801, doi: 10.1002/hyp.10478

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11. Naseem, B., H. Ajami, I. Cordery, A. Sharma. 2015. A Multi-objective Assessment of Alternate Conceptual Ecohydrological Models, Journal of Hydrology, 529(3):1221-1234, doi:10.1016/j.jhydrol.2015.08.060

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10. Graham, P., M. Andersen, M.F. McCabe, H. Ajami, A. Baker, I. Acworth. 2015. To What Extent Do Long-Duration High-Volume Dam Releases Influence River-Aquifer Interactions? A Case Study in New South Wales, Australia, Hydrogeology Journal, 23: 319-334, doi: 10.1007/s10040-014-1212-3

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2014

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9. Ajami, H., J.P. Evans, M.F. McCabe, S. Stisen. 2014. Technical Note: Reducing the Spin-up Time of Integrated Surface Water–Groundwater Models, Hydrology and Earth System Sciences, 18, 5169-5179, doi: 10.5194/hess-18-5169-2014

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8. Ajami, H., M.F. McCabe, J.P. Evans, S. Stisen. 2014. Assessing the Impact of Model Spin-up on Surface Water-Groundwater Interactions Using an Integrated Hydrologic Model, Water Resources Research, 50: doi:10.1002/2013WR014258

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7. Khan, U., N. Tuteja, H. Ajami, A. Sharma. 2014. An Equivalent Cross-Sectional Basis for Semi-Distributed Hydrological Modeling, Water Resources Research, 50, doi:10.1002/2013WR014741

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2012

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6. Ajami, H., T. Maddock III, T. Meixner, J.F. Hogan, D.P. Guertin.2012. RIPGIS-NET: A GIS Tool for Riparian Groundwater Evapotranspiration in MODFLOW, Ground Water, 50(1): 154-158, doi:10.1111/j.1745-6584.2011.00809.x

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5. Abramowitz, G., L. Pouyanne, H. Ajami. 2012. On the Information Content of Surface Meteorology for Downward Atmospheric Long-wave Radiation Synthesis, Geophysical Research Letters, 39: doi:10.1029/2011GL050726

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4. Ajami, H., T. Meixner, F. Dominguez, J.F. Hogan, T. Maddock III. 2012. Seasonalizing Mountain System Recharge in Semi-Arid Basins-Climate Change Impacts, Ground Water, 50(4): 585-597, doi:10.1111/j.1745-6584.2011.00881.x

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Prior to 2011

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3. Ajami, H., P.A. Troch, T. Maddock III, T. Meixner, C. Eastoe. 2011. Quantifying Mountain Block Recharge by Means of Catchment-Scale Storage-Discharge Relationship, Water Resources Research, 47, W04504, doi:10.1029/2010WR009598

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2. Ajami, H., T. Meixner, T. Maddock III, J.F. Hogan, D.P. Guertin.2011. Impact of Land-Surface Elevation and Riparian Evapotranspiration Seasonality on Groundwater Budget in MODFLOW Models, Hydrogeology Journal, 19:1181-1188, doi:10.1007/s10040-011-0743-0

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1. Stromberg, J.C., M.G.F. Tluczek, A.F. Hazelton, H. Ajami.2010. A Century of Riparian Forest Expansion Following Extreme Disturbance: Spatio-Temporal Change in Populus/Salix/Tamarix Forests Along the Upper San Pedro River, Arizona, USA, Forest Ecology and Management, 259 (6):1181-1189, doi:10.1016/j.foreco.2010.01.005

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Book Chapters

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1. Ajami, H. 2021. Geohydrology: Global Hydrological Cycle, In: Alderton, David; Elias, Scott A. (eds.) Encyclopedia of Geology, 2nd edition, vol.[6], pp. 393-398. United Kingdom: Academic Press, https://doi.org/10.1016/B978-0-12-409548-9.12387-5

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2. Ajami, H.2021. Geohydrology: Groundwater, In: Alderton, David; Elias, Scott A. (eds.) Encyclopedia of Geology, 2nd edition, vol.[6], pp. 408-415. United Kingdom: Academic Press, https://doi.org/10.1016/B978-0-12-409548-9.12388-7

        

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