Skip to Main Content U.S. Department of Energy
Atmospheric Science & Global Change

Staff information


Mohamad Hejazi

Human-Earth Sys Sci: Modeling
Earth Scientist


Mohamad Hejazi is a research scientist with the Joint Global Change Research Institute (JGCRI) and the Pacific Northwest National Laboratory. He holds a Ph.D. (2009) from the University of Illinois at Urbana-Champaign, and a B.S. (2002) and M.S. (2004) degrees from the University of Maryland, College Park. His research interests include: global hydrologic modeling, global and regional sectoral water demand models, separating the effect of climate change, human activities, and climate policies on hydrology, and the value of information (e.g. weather and climate forecasts) to human decisions (e.g., farmers, reservoir operators). Prior to joining JGCRI-PNNL, he worked as a postdoctoral research associate at the University of Illinois Urbana-Champaign and as a research assistant at the USGS and the Illinois Water Survey.

PNNL Publications


  • Burleyson C.D., G.C. Iyer, M.I. Hejazi, S.H. Kim, P. Kyle, J.S. Rice, and A.D. Smith, et al. 2020. "Future western U.S. building electricity consumption in response to climate and population drivers: A comparative study of the impact of model structure." Energy 208. PNNL-SA-151017. doi:10.1016/
  • Chaturvedi V., P. Nagar Koti, R. Sugam, K. Neog, and M.I. Hejazi. 2020. "Cooperation or Rivalry? Impact of alternative development pathways on India's long-term electricity generation and associated water demands." Energy 192. PNNL-SA-147715. doi:10.1016/
  • Chen M., C.R. Vernon, N.T. Graham, M.I. Hejazi, M. Huang, Y. Cheng, and K.V. Calvin. 2020. "Global land use for 2015-2100 at 0.05° resolution under diverse socioeconomic and climate scenarios." Scientific Data 7. PNNL-SA-155943. doi:10.1038/s41597-020-00669-x
  • Graham N.T., M.I. Hejazi, M. Chen, E. Davies, J.A. Edmonds, S.H. Kim, and S. Turner, et al. 2020. "Humans drive future water scarcity changes across all Shared Socioeconomic Pathways." Environmental Research Letters 15, no. 1:Article No. 014007. PNNL-SA-151297. doi:10.1088/1748-9326/ab639b
  • Graham N.T., M.I. Hejazi, S.H. Kim, E. Davies, J.A. Edmonds, and F.R. Miralles-Wilhelm. 2020. "Future changes in the trading of virtual water." Nature Communications 11, no. 1:Article No. 3632. PNNL-SA-153692. doi:10.1038/s41467-020-17400-4
  • Khan Z., T.B. Wild, C.R. Vernon, A. Miller, M.I. Hejazi, L.E. Clarke, and F.R. Miralles-Wilhelm, et al. 2020. "Metis – A tool to harmonize and analyze multi-sectoral data and linkages at variable spatial scales." Journal of Open Research Software 8, no. 1:Article No. 292. PNNL-SA-146642. doi:10.5334/JORS.292
  • Khan Z., T.B. Wild, M. Silva Carrazzone, R. Gaudioso, M. Mascari, F. Bianchi, and F. Weinstein, et al. 2020. "Integrated energy-water-land nexus planning to guide national policy: an example from Uruguay." Environmental Research Letters 15, no. 9. PNNL-SA-150376. doi:10.1088/1748-9326/ab9389
  • Link R.P., T. Wild, A.C. Snyder, M.I. Hejazi, and C.R. Vernon. 2020. "100 Years of Data is Not Enough to Establish Reliable Drought Thresholds." Journal of Hydrology X 7, no. X:100052. PNNL-SA-144280. doi:10.1016/j.hydroa.2020.100052
  • Zhang X., H. Li, L. Leung, L. Liu, M.I. Hejazi, B. Forman, and W. Yigzaw. 2020. "River Regulation Alleviates the Impacts of Climate Change on US Thermoelectricity Production." Journal of Geophysical Research. D. (Atmospheres) 125, no. 4. PNNL-SA-120778. doi:10.1029/2019JD031618


  • Arango S., S. Turner, K. Daenzer, J. Ríos-Ocampo, M.I. Hejazi, T. Kober, and A.C. Alvarez, et al. 2019. "Climate impacts on hydropower in Colombia: A multi-model assessment of power sector adaptation pathways." Energy Policy 128. PNNL-SA-130753. doi:10.1016/j.enpol.2018.12.057
  • Huang Z., M.I. Hejazi, Q. Tang, C.R. Vernon, Y. Liu, M. Chen, and K.V. Calvin. 2019. "Global agricultural green and blue water consumption under future climate and land use changes." Journal of Hydrology 574. PNNL-SA-137028. doi:10.1016/j.jhydrol.2019.04.046
  • Liu L., M.I. Hejazi, G.C. Iyer, and B. Forman. 2019. "Implications of water constraints on electricity capacity expansion in the United States." Nature Sustainability 2, no. 3:206–213. PNNL-SA-129550. doi:10.1038/s41893-019-0235-0
  • Luderer G., M. Pehl, A. Arvesen, T. Gibon, B. Bodirsky, H. Sytze de Boer, and O. Fricko, et al. 2019. "Environmental co-benefits and adverse side-effects of alternative power sector decarbonization strategies." Nature Communications 10. PNNL-ACT-SA-10352. doi:10.1038/s41467-019-13067-8
  • Vernon C.R., M.I. Hejazi, S. Turner, Y. Liu, C.J. Braun, X. Li, and R.P. Link. 2019. "A Global Hydrologic Framework to Accelerate Scientific Discovery." Journal of Open Research Software 7, no. 1:Article No. 1. PNNL-SA-137438. doi:10.5334/jors.245
  • Wise M.A., P.L. Patel, Z. Khan, S.H. Kim, M.I. Hejazi, and G.C. Iyer. 2019. "Representing power sector detail and flexibility in a multi-sector model." Energy Strategy Reviews 26. PNNL-SA-138629. doi:10.1016/j.esr.2019.100411
  • Yigzaw W., H. Li, X. Fang, L. Leung, N. Voisin, M.I. Hejazi, and Y. Demissie. 2019. "A Multilayer Reservoir Thermal Stratification Module for Earth System Models." Journal of Advances in Modeling Earth Systems 11, no. 10:3265-3283. PNNL-SA-141532. doi:10.1029/2019MS001632


  • Huang Z., M.I. Hejazi, X. Li, Q. Tang, C.R. Vernon, G. Leng, and Y. Liu, et al. 2018. "Reconstruction of global gridded monthly sectoral water withdrawals for 1971-2010 and analysis of their spatiotemporal patterns." Hydrology and Earth System Sciences 22, no. 4:2117-2133. PNNL-SA-129126. doi:10.5194/hess-22-2117-2018
  • Li X., C.R. Vernon, M.I. Hejazi, R.P. Link, Z. Huang, L. Liu, and L. Feng. 2018. "Tethys – A Python Package for Spatial and Temporal Downscaling of Global Water Withdrawals." Journal of Open Research Software 6, no. 1:9. PNNL-SA-129638. doi:10.5334/jors.197
  • Liu Y., M.I. Hejazi, H. Li, X. Zhang, and G. Leng. 2018. "A Hydrological Emulator for Global Applications - HE v1.0.0." Geoscientific Model Development 11, no. 3:1077-1092. PNNL-SA-125122. doi:10.5194/gmd-11-1077-2018
  • Lucena A., M.I. Hejazi, E. Vasquez-Arroyo, S. Turner, A. Köberle, K. Daenzer, and P. Rochedo, et al. 2018. "Interactions between climate change mitigation and adaptation: The case of hydropower in Brazil." Global Environmental Change 164. PNNL-SA-130754. doi:10.1016/
  • Mouratiadou I., M. Bevione, D.L. Bijl, L. Drouet, M.I. Hejazi, S. Mima, and M. Pehl, et al. 2018. "Water demand for electricity in deep decarbonisation scenarios: a multi-model assessment." Climatic Change 147, no. 1-2:91-106. PNNL-SA-135282. doi:10.1007/s10584-017-2117-7
  • Srinivasan S., N. Kholod, V. Chaturvedi, P. Ghosh, R. Mathur, L.E. Clarke, and M. Evans, et al. 2018. "Water for Electricity in India: A Multi-Model Study of Future Challenges and Linkages to Climate Change Mitigation." Applied Energy 210. PNNL-SA-122615. doi:10.1016/j.apenergy.2017.04.079
  • Wan W., J. Zhao, H. Li, A.K. Mishra, M.I. Hejazi, H. Lu, and Y. Demissie, et al. 2018. "A Holistic View of Water Management Impacts on Future Droughts: A Global Multimodel Analysis." Journal of Geophysical Research: Atmospheres 123, no. 11:5947-5972. PNNL-SA-129690. doi:10.1029/2017JD027825
  • Yigzaw W.Y., H. Li, Y. Demissie, M.I. Hejazi, L. Leung, N. Voisin, and R. Payn. 2018. "A New Global Storage-Area-Depth Data Set for Modeling Reservoirs in Land Surface and Earth System Models." Water Resources Research 54, no. 12:10372-10386. PNNL-SA-140190. doi:10.1029/2017WR022040


  • Li X., C.R. Vernon, M.I. Hejazi, R.P. Link, L. Feng, Y. Liu, and L.T. Rauchenstein. 2017. "Xanthos - A Global Hydrologic Model." Journal of Open Research Software 5, no. 1:21. PNNL-SA-126584. doi:10.5334/jors.181
  • Liu L., M.I. Hejazi, H. Li, B. Forman, and X. Zhang. 2017. "Vulnerability of US thermoelectric power generation to climate change when incorporating state-level environmental regulations." Nature Energy 2. PNNL-SA-121326. doi:10.1038/nenergy.2017.109


  • Voisin N., M.C. Kintner-Meyer, R. Skaggs, T.B. Nguyen, D. Wu, J.A. Dirks, and Y. Xie, et al. 2016. "Vulnerability of the US Western Electric Grid to Hydro-Climatological Conditions: How bad can it get?." Energy 115, no. Part 1:1-12. PNNL-SA-112684. doi:10.1016/


  • Calvin K.V., B. Bond-Lamberty, J.A. Edmonds, M.I. Hejazi, S.T. Waldhoff, M.A. Wise, and Y. Zhou. 2015. "The Effects of Climate Sensitivity and Carbon Cycle Interactions on Mitigation Policy Stringency." Climatic Change 131, no. 1:35-50. PNNL-SA-94788. doi:10.1007/s10584-013-1026-7
  • Hejazi M.I., N. Voisin, L. Liu, L.M. Bramer, D.C. Fortin, J.E. Hathaway, and M. Huang, et al. 2015. "21st Century United States Emissions Mitigation Could Increase Water Stress more than the Climate Change it is Mitigating." Proceedings of the National Academy of Sciences of the United States of America 112, no. 34:10635-10640. PNNL-SA-105956. doi:10.1073/pnas.1421675112
  • Strzepek K., J. Neumann, J. Smith, J. Martinich, B. Boehlert, M.I. Hejazi, and J. Henderson, et al. 2015. "Benefits of Greenhouse Gas Mitigation on the Supply, Management, and Use of Water Resources in the United States." Climatic Change 131, no. 1:127-141. PNNL-SA-93379. doi:10.1007/s10584-014-1279-9
  • Zhou Y., M.I. Hejazi, S.J. Smith, J.A. Edmonds, H. Li, L.E. Clarke, and K.V. Calvin, et al. 2015. "A Comprehensive View of Global Potential for Hydro-generated Electricity." Energy and Environmental Science 8, no. 9:2622-2633. PNNL-SA-109269. doi:10.1039/c5ee00888c


  • Hejazi M.I., X. Cai, X. Yuan, X.Z. Liang, and P. Kumar. 2014. "Incorporating reanalysis-based short-term forecasts from a regional climate model in an irrigation scheduling optimization problem." Journal of Water Resources Planning and Management 140, no. 5:699-713. PNWD-SA-10020. doi:10.1061/(ASCE)WR.1943-5452.0000365


  • Hejazi M.I., J.A. Edmonds, V. Chaturvedi, E. Davies, and J. Eom. 2013. "Scenarios of Global Municipal Water-Use Demand Projections over the 21st Century." Hydrological Sciences Journal 58, no. 3:1-20. PNNL-SA-85862. doi:10.1080/02626667.2013.772301


  • Hejazi M.I., J.A. Edmonds, and V. Chaturvedi. 2012. "Global irrigation demand - A holistic approach." Irrigation & Drainage Systems Engineering 1, no. 2:Article No. e106. PNNL-SA-89360.


  • Cai X., M.I. Hejazi, and D. Wang. 2011. "Value of Probabilistic Weather Forecasts: Assessment by Real-Time Optimization of Irrigation Scheduling." Journal of Water Resources Planning and Management 137, no. 5:391-403. PNNL-SA-83186. doi:10.1061/(ASCE)WR.1943-5452.0000126
  • Wang D., and M.I. Hejazi. 2011. "Quantifying the relative contribution of the climate and direct human impacts on mean annual streamflow in the contiguous United States." Water Resources Research 47. PNNL-SA-78801. doi:10.1029/2010WR010283

Atmospheric Sciences & Global Change

Science at PNNL

Research Highlights

View All ASGC Highlights

RSS Feed RSS feed logo