Research

Felix, J.D., A. Berner, G.A. Wetherbee, S.F. Murphy, and R.C. Heindel (2023). Nitrogen isotopes indicate vehicle emissions and biomass burning dominate ambient ammonia across Colorado's Front Range urban corridor. Environmental Pollution, 316(1): 120537.  https://doi.org/10.1016/j.envpol.2022.120537

Harris, E.*, P.A. Montagna, A.R. Douglas, L. Vitale, and D. Buzan (2023). “Influence of Formosa Plastics Company discharge on long-term dynamics of abiotic and biotic resources in Lavaca Bay, Texas”. Environmental Monitoring and Assessment 195(1): 1-24. https://doi.org/10.1007/s10661-022-10665-w

Li, Y., J. Liu, C. George, H. Herrmann, M. Gu, M. Yang, Y. Wang, A. Mellouki, Y. Pan, J.D. Felix, H. Kawashima, Z. Zhang, S. Wang, and Y. Zeng (2023). Apportioning atmospheric ammonia sources across spatial and seasonal scales by their isotopic fingerprint. Environmental Science and Technology, 57(43): 16424–16434. https://doi.org/10.1021/acs.est.3c04027 

Seymore, J.*, J.D. Felix, H. Abdulla, D. Bergmann, M.L.A.M. Campos, and J. Florêncio (2023). Pandemic-related anthropogenic influences on the dissolved organic matter chemical character in São Paulo state wet deposition by ultrahigh-resolution mass spectrometry. ACS Earth Space Chem, 7(10): 1929–1946. https://doi.org/10.1021/acsearthspacechem.3c00076 

Ahmed, M., Y. Chen, and M.M. Khalil (2022). Isotopic composition of groundwater resources in arid environments. Journal of Hydrology, 609: 127773. https://doi.org/10.1016/j.jhydrol.2022.127773 

Douglas, A.R., D. Murgulet, M. Greige**, K. Das, J.D. Felix, and H.A. Abdulla (2022). Organic matter composition and inorganic nitrogen response to Hurrican Harvey's negative storm surge in Corpus Christi Bay, Texas. Frontiers in Marine Science - Coastal Ocean Process, 9.  https://doi.org/10.3389/fmars.2022.961206

Fallatah, O., M. Ahmed, B. Gyawali*, and A. Alhawsawi (2022). Factors controlling groundwater radioactivity in arid environments: An automated machine learning approach. Science of the Total Environment, 830: 154707. https://doi.org/10.1016/j.scitotenv.2022.154707

Gyawali, B.*, M. Ahmed, D. Murgulet, and D.N. Wiese (2022). Filling temoporal gaps within and between GRACE and GRACE-FO terrestrial water storage records: An innovative approach. Remote Sensing, 14(7): 1565. https://doi.org/10.3390/rs14071565

Gyawali, B.*, D. Murgulet, and M. Ahmed (2022). Quantifying changes in groundwater storage and response to hydroclimatic extremes in a coastal aquifer using remote sensing and ground-based measurements: The Texas Gulf Coast Aquifer. Remote Sensing, 14: 612.  https://doi.org/10.3390/rs14030612.

Haley, M.*, M. Ahmed, E. Gebermichael, D. Murgulet, and M. Starek (2022). Land Subsidence in the Texas Coastal Bend: Locations, Rates, Triggers, and Consequences. Remote Sensing, 14: 192. https://doi.org/10.3390/rs14010192 

Murgulet, D., C.V. Lopez*, and A.R. Douglas (2022). Radioactive and stable isotopes reveal variations in nearshore submarine groundwater discharge composition and magnitude across northwestern Gulf of Mexico estuaries. Science of the Total Environment 823: 153814. https://doi.org/10.1016/j.scitotenv.2022.153814

Ahmed, M., M. Aqnouy, and J. Elmessari (2021). Sustainability of Morocco's Groundwater Resources in Response to Natural and Anthropogenic Forces. Journal of Hydrology, 603: 126866.  https://doi.org/10.1016/j.jhydrol.2021.126866

Douglas, A.R.*, D. Murgulet, and H. Abdulla (2021). Impacts of hydroclimatic variability on surface water and porewater dissolved organic matter in a semi-arid estuary”. Marine Chemistry, 235: 104006. https://doi.org/10.1016/j.marchem.2021.104006  

Douglas, A.R.*, D. Murgulet, and P.A. Montagna (2021). Hydroclimatic variability drives submarine groundwater discharge and nutrient fluxes in an anthropogenically disturbed, semi-arid estuary. Science of the Total Environment, 755(2): 142574.  https://doi.org/10.1016/j.scitotenv.2020.142574

Harfmann, J.L., G.B. Avery, H.D. Rainey, R.N. Mead, S.A. Skrabal, R.J. Kieber, J.D. Felix, J.R. Helms, and D.C. Podgorski (2021). Composition and lability of photochemically released dissolved organic matter from resuspended estuarine sediments. Organic Geochemistry, 151: 104164. https://doi.org/10.1016/j.orggeochem.2020.104164 

Huang, S., Y. Fang, F. Zhu, E.M. Elliott, J.D. Felix, F. Wang, S. Li, D. Liu, L. Song, Z. Li, P. Fu, and S. Fu (2021). Multiyear measurements on ¹⁵N natural abundance of precipitation nitrate at a rural forested site. Atmospheric Environment, 253: 118353. https://doi.org/10.1016/j.atmosenv.2021.118353 

Qiu, Y.*, and J.D. Felix (2021). Hurricane/tropical storm rainwater chemistry in the US (2008-2009). Science of The Total Environment, 798: 149009.  https://doi.org/10.1016/j.scitotenv.2021.149009

Sharma, B.*, J.D. Felix, L. Myles, T. Butler, S. Summerlin, and M.S. Shimizu (2021). Wet deposition ethanol concentration at US Atmospheric Integrated Research Monitoring Network (AIRMoN) sites. Journal of Atmospheric Chemistry, 78(2): 125-138. https://doi.org/10.1007/s10874-020-09414-5 

Ahmed, M. (2020). Sustainable management scenarios for northern Africa's fossil aquifer systems. Journal of Hydrology: 589, 125196. https://doi.org/10.1016/j.jhydrol.2020.125196

Ahmed, M., R. Turner*, M. Haley*, S. Shyrigh*, D. Colmenero*, and T. Penchala* (2020). Constructing a Geophysical Test Site for Coastal Community's Research and Education Activities. The Leading Edge, 40: 2.8-2.13. https://doi.org/10.1190/tle40030208.1 

Berner, A.H.* and J.D. Felix (2020). Investigating ammonia emissions in a coastal urban airshed using stable isotope techniques. Science of the Total Environment: 707, 134952.  https://doi.org/10.1016/j.scitotenv.2019.134952

Douglas, A.R.*, D. Murgulet, and P.A. Montagna (2020). Hydroclimatic variability drives submarine groundwater discharge and nutrient fluxes in an anthropogenically disturbed, semi-arid estuary. Science of the Total Environment, 142574.  https://doi.org/10.1016/j.scitotenv.2020.142574

Douglas, A.R.*, D. Murgulet, and R.N. Peterson (2020). The use of radon and radium isotopes to determine submarine groundwater discharge in an anthropogenically disturbed, semi-arid estuary. Journal of Hydrology, 124369. https://doi.org/10.1016/j.jhydrol.2019.124369

Essam, D.*, M. Ahmed, A. Abouelmagd, and F. Soliman (2020). Monitoring temporal variations in groundwater levels in urban areas using Ground Penetrating Radar. Science of the Total Environment, 703: 134986. https://doi.org/10.1016/j.scitotenv.2019.134986 

Felix, J.D., and D. Murgulet (2020). Nitrate isotopic composition of sequential Hurricane Harvey wet deposition: Low latitude NOx sources and oxidation chemistry. Atmospheric Environment, 117748. https://doi.org/10.1016/j.atmosenv.2020.11774

Lopez, C.*, D. Murgulet, and I.R. Santos (2020). Radioactive and Stable Isotope Measurements Reveal Saline Submarine Groundwater Discharge in a Semiarid Estuary. Journal of Hydrology, 125395. https://doi.org/10.1016/j.jhydrol.2020.125395

Murgulet, D., A.R. Douglas*, J.A. Herrera Silveira, I. Mariño Tapia, and A. Valle-Levinson (2020). Submarine groundwater discharge along the northern coast of the Yucatán Peninsula. Proceedings of the Sixteenth Multidisciplinary Conference on Sinkholes and the Engineering and Environmental Impact of Karst, San Juan, Puerto Rico. National Cave and Karst Research Institute Symposium 8. Carlsbad (NM): National Cave and Karst Research Institute. https://doi.org/10.5038/9781733375313.1060

Shimizu, M.S., S.L. Summerlin, J.D. Felix, J. Halls, G.B. Avery, R.J. Kieber, C.S. Lane, R.N. Mead, and J.D. Willey (2020). Variable ethanol concentrations and stable carbon isotopes reveal anthropogenic ethanol contributions to rainwater. Atmospheric Environment, 234: 117578. https://doi.org/10.1016/j.atmosenv.2020.117578 

Spalt, N.*, D. Murgulet, and H. Abdulla (2020). Spatial variation and availability of nutrients at an oyster reef in relation to submarine groundwater discharge. Science of the Total Environment, 710: 136283. https://doi.org/10.1016/j.scitotenv.2019.136283

Díaz-Álvarez, E.A., J.D. Felix, and E. de la Barrera (2019). Elemental and isotopic assessment for Colombian orchids from a montane cloud forest: a baseline for global environmental change. Acta Physiol Plant, 41: 99. https://doi.org/10.1007/s11738-019-2893-y 

Felix, J.D., J.A. Roebuck, R.N. Mead, J.D. Willey, G.B. Avery, and R.J. Kieber (2019). Methanol and ethanol concentrations in a Greenland ice core. Atmospheric Environment, 217: 116948. https://doi.org/10.1016/j.atmosenv.2019.116948 

Huang, S., E.M. Elliott, J.D. Felix, Y. Pan, D. Liu, S. Li, Z. Li, F. Zhu, N. Zhang, P. Fu, and Y. Fang (2019). Seasonal pattern of ammonium 15N natural abundance in precipitation at a rural forested site and implications for NH3 source partitioning. Environmental Pollution, 247: 541–549. https://doi.org/10.1016/j.envpol.2019.01.023 

Willey, J.D., G.B. Avery, J.D. Felix, R.J. Kieber, R.N. Mead, and M.S. Shimizu (2019). Rapidly increasing ethanol concentrations in rainwater and air. npj Climate and Atmospheric Science, 2: 3. https://doi.org/10.1038/s41612-018-0059 

Murgulet, D., M. Trevino*, A. Douglas*, N. Spalt*, X. Hu, and V. Murgulet (2018). Temporal and spatial fluctuations of groundwater-derived alkalinity fluxes to a semiarid coastal embayment. Science of the Total Environment. Science of the Total Environment, 630: 1343-1359.  https://doi.org/10.1016/j.scitotenv.2018.02.333

Spalt, N.*, D. Murgulet, and X. Hu (2018). Relating estuarine geology to groundwater discharge at an oyster reef in Copano Bay, Texas. Hydrology Journal, 564: 785-801.  https://doi.org/10.1016/j.jhydrol.2018.07.048

Murgulet, D., V. Murgulet, R. Hay, A. Mestas-Nunez, and P. Tissot (2017). Relationships between Sea Surface Temperature Changes in the Pacific and Atlantic Oceans and South Texas Precipitation and Streamflow Variability. Journal of Hydrology, 550: 726-739.  https://doi.org/10.1016/j.jhydrol.2017.05.041

Bighash, P.*, and D. Murgulet (2015). Application of factor analysis and electrical resistivity to understand groundwater contributions to coastal embayments in semi-arid and hypersaline coastal settings. Science of the Total Environment, 532: 688-701. https://doi.org/10.1016/j.scitotenv.2015.06.077

Tick, G.R., J.R. Harvell, and D. Murgulet (2015). Intermediate-Scale Investigation of Enhanced-Solubilization Agents on the Dissolution and Removal of a Multicomponent Dense Nonaqueous Phase Liquid (DNAPL) Source. Water Air and Soil Pollution, 226: 371. https://doi.org/10.1007/s11270-015-2636-7

Weber, E. T. II, and D. Denny (2009). 1-D inversion of magnetotelluric vertical electrical sounding curves: Defining coastal aquifers with freshwater-saltwater transition zones. Journal of Applied Geophysics.

Garrison, J.R. Jr., E.T. Weber, II, S. Potter Miller, G. McMechan, and X. Zeng (2009). Ground-penetrating Radar study of North Padre Island, Texas: Implications for barrier island internal architecture, models of micro-tidal barrier island growth, and Gulf of Mexico sea-level cyclicity. Journal of Sedimentary Research, 80(4): 303-319. https://doi.org/10.2110/jsr.2010.034

Ahmed, Wiese, D.N., Gyawali, B.*, Ilhan, I., Fawzy, D.E., Arslan, G., and Somay-Altas, M., 2020. Filling Temporal Gaps Within and Between GRACE and GRACE-FO Records: Advances, Challenges, and Future Opportunities. American Geophysical Union Fall Meeting. G001-06.

Colmenero, D.M.** and Ahmed, M., 2020. Subsurface Geologic Controls on the Dune Morphology in Barrier Islands. American Geophysical Union Fall Meeting. EP061-0032.

Gyawali, B.*, Murgulet, D., and Wolfe, W.**, 2020. Estimation of Groundwater Discharge Variability to the Gulf of Mexico Using Remote Sensing and Field Observations. American Geophysical Union Fall Meeting. H033-0007.

Haley, M.** and Ahmed, M., 2020. Quantifying Land Subsidence Along the South Texas Coast Using Radar Interferometric Techniques. American Geophysical Union Fall Meeting. G004-0010.

Murgulet, I.***, Douglas, A. R.*, Wolfe, W.**, and Abdulla, H.A.N., 2020. Nutrient and DOM distribution and transformation along a river course from headwaters to discharge: inorganic and organic nutrients. American Geophysical Union Fall Meeting. B047-0013.

Penchala, T.** and Ahmed, M., 2020. Modeling the Impact of Abandoned Wells on the Gulf Coast Aquifer in Texas. American Geophysical Union Fall Meeting. H050-09.

Vickers, C. M.*, Murgulet, D., Felix, J. D., Douglas, A. R.*, and Wolfe, W.*, 2020. Groundwater Contribution of Elevated Nutrients to a Hypersaline Estuary: Laguna Salada (Baffin Bay), Texas. American Geophysical Union Fall Meeting. H033-0008.

Wolfe, W.*, and Murgulet, D., 2020. Constraints on Radon and SGD Temporal Variability in a Semi-arid, Well Mixed Estuary. American Geophysical Union Fall Meeting. H033-0006.

Walker, L.**, Murgulet, D., Lopez, C.V., and Douglas, A.*, 2019. Temporal changes in the radiogenic signature of shallow groundwater and its potential implications in the SGD estimates in a semiarid area. American Geophysical Union Fall Meeting. H41K-1862,

Gyawali, B.* and Murgulet, D., and Ahmed, M., 2019. Quantifying change in groundwater storage in the coastal region of Texas. American Geophysical Union Fall Meeting. H43M-2239.

Greige, M.**, Murgulet, D., Douglas, A.R.*, Abdulla, H.A., 2019. Hurricane Harvey’s impact on the DOM composition on the south shore of Corpus Christi Bay, Texas. American Geophysical Union Fall Meeting. B23A-05.

Douglas, A.R.*, Murgulet, D., Abdulla, H.A., 2019. Seasonal trends and relationships between surface and porewater dissolved organic matter in a disturbed semi-arid estuary. American Geophysical Union Fall Meeting. B13G-2581.

Stearns, J* and Murgulet, D., 2019. An evaluation of the feasibility of the time-lapse electrical resistivity tomography method in quantifying submarine groundwater discharge in fine sediment and highly saline embayments. SEG Technical Program Expanded Abstracts 2019. https://doi.org/10.1190/segam2019-3216805.1

Murgulet, D., 2019. What does groundwater have to do with phytoplankton growth and hypoxia in South Texas estuaries? Geological Sciences Seminar, University of Texas at San Antonio. Invited talk

Murgulet, D., 2019. The impacts on groundwater from mining and “natural” occurrences of radium (Where does uranium occur in groundwater, how serious is the problem and what is the best course of action?). 2019 Texas Groundwater Conference, Austin. Invited talk

Murgulet, D., Lopez, C.*, 2019. Submarine Groundwater Discharge and Nutrient Input to a Semiarid and Hypersaline Estuary: Baffin Bay, Texas. Goldschmidt Geochemical Society Conference. Goldschmidt Abstracts, 2019 2377.

Murgulet, D., Murgulet, V., Trevino, M.*, Douglas, A.*, and Hu, X., 2019. Alkalinity variation in a semi-arid and secondary bay of south Texas. 2019 Texas Sea Grant Research Symposium (April 2019). Invited talk

Gyawali, B.* and Murgulet, D., Ruben, Z.*, and Stearns, J.*, 2019. Quantifying temporal variation in groundwater storage and submarine groundwater discharge in the coastal region of Texas; 2019 Texas Sea Grant Research Symposium (April 2019).

Douglas, A.*, Murgulet, D., Abdulla. H., and Montagna, P., 2019. Molecular characterization of dissolved organic matter in a highly disturbed semi-arid bay. 2019 Texas Sea Grant Research Symposium (April 2019).