{"id":5,"date":"2022-06-22T19:57:39","date_gmt":"2022-06-22T23:57:39","guid":{"rendered":"https:\/\/www2.whoi.edu\/staff\/template-blue-prepop\/?page_id=5"},"modified":"2025-04-01T12:08:16","modified_gmt":"2025-04-01T16:08:16","slug":"front-page","status":"publish","type":"page","link":"https:\/\/www2.whoi.edu\/staff\/mohammedhashim\/","title":{"rendered":"Hello and welcome to my personal website!"},"content":{"rendered":"\n\n\t\t\t\t\n\t\t\t\t\"DCAF5910-3040-4C57-B01C-CDB8BFFBF6B0_1_105_c\"\n\t\t\t\t<\/a>\n\t

Dr. Mohammed S. Hashim<\/h2>\nUSC Wrigley Ballmer Initiative Postdoctoral Fellow
\nDepartment of Earth Sciences
\nUniversity of Southern California\nGuest Investigator
\nDepartment of Marine Chemistry and Geochemistry
\nWoods Hole Oceanographic Institution\n

 <\/p>\nContact Information:<\/strong>
\nhashimm@usc.edu<\/a>
\nMohammed.hashim@whoi.edu<\/a>\n

 <\/p>\nCurrent Address:<\/strong>
\n3651 Trousdale Pky
\nLos Angeles, CA 90089
\nZHS 223\n\t

Research Interests<\/h3>\n

I am interested in the ocean today and throughout Earth history, focusing specifically on the carbonate chemistry of seawater. Some examples of my current research focuses are:<\/p>\n

    \n
  1. Exploring the roles of calcium carbonate minerals in the oceanic carbon cycle.<\/li>\n
  2. Quantifying the impact of sub-seafloor processes on ocean chemistry.<\/li>\n
  3. Developing and testing ocean-based carbon sequestration techniques.<\/li>\n<\/ol>\n

    My current and previous projects focus on fish produced carbonates in the North Atlantic near Bermuda, sub-seafloor carbon cycling in the Baffin Bay near Greenland glaciated margin, and carbonate sediments on the slope of the Great Bahama Bank. I have also cultured coccolithophores in the lab, and conducted experiments to study the formation, alteration, and dissolution of carbonate minerals (aragonite, calcite, and dolomite) to constrain trace element incorporation and isotope fractionation using experiments. So far, I have been focusing on iodine, barium, and sulfur. More recently, my research has been focusing on ocean alkalinity enhancement as an approach to sequester carbon in the ocean and chemical engineering approaches to generate alkalinity from carbonate rocks.<\/p>\n

     <\/p>\n

    I am always excited to chat about science, ocean, and carbonates, so please don’t hesitate to reach out!<\/p>\n\t

    Selected Peer-Reviewed Publications<\/h3>\n

    Hashim, M<\/strong>., Marx, L., Klein, F., Dean, C., Burdige, E., Hayden, M., McCorkle, D., and Subhas, A. 2025. Mineral Formation during Shipboard Ocean Alkalinity Enhancement Experiments in the North Atlantic, EGUsphere [preprint]<\/em>, https:\/\/doi.org\/10.5194\/egusphere-2025-988<\/a>.<\/p>\n

    M. Yaqoob, M. Y. Ansari, M. Ishaq, I. S. A. J. Jayachandran, M. Hashim<\/strong> and T. D. Seers. 2025. MicroCrystalNet: An Efficient and Explainable Convolutional Neural Network for Microcrystal Classification using Scanning Electron Microscope Petrography. IEEE Access.<\/em> https:\/\/doi.10.1109\/ACCESS.2025.3552626<\/a>.<\/p>\n

    Hashim, M., <\/strong>Subhas, A., Kaczmarek, S., Gemakrisindo Wolfram Naa, and Bish, D. 2024. A Process-based Geochemical Framework for Carbonate Sediments During Marine Diagenesis. Geochimica et Cosmochimica Acta<\/em>. https:\/\/doi.org\/10.1016\/j.gca.2024.05.023<\/a><\/p>\n

    Hashim, M., <\/strong>Burke, J., Hardisty, D., and Kaczmarek, S.E. 2022. Iodine Incorporation into Dolomite: Experimental Constraints and Implications for the Iodine Redox Proxy and Proterozoic Ocean. \u00a0Geochimica et Cosmochimica Acta. https:\/\/doi.org\/10.1016\/j.gca.2022.10.027<\/a><\/em><\/p>\n

    Hashim, M. <\/strong>and Kaczmarek, S.E. 2022. Rhombic Calcite Microcrystals as a Textural Proxy for Meteoric Diagenesis. Scientific Reports.<\/em> https:\/\/doi.org\/10.21203\/rs.3.rs-803597\/v<\/a><\/p>\n

    Hashim<\/strong>, M.<\/strong> and Kaczmarek, S.E. 2021. The Transformation of Aragonite to Calcite in the Presence of Magnesium: Implications for Marine Diagenesis. Earth and Planetary Science Letters<\/em>, v. 574., no. 117166. Doi: https:\/\/doi.org\/10.1016\/j.epsl.2021.117166<\/a><\/p>\n

    Hashim, M<\/strong>. and Kaczmarek, S.E, 2020. Experimental Stabilization of Carbonate Sediments to Calcite: Insights into the Depositional and Diagenetic Controls on Calcite Microcrystal Texture. Earth and Planetary Science Letters<\/em>. vol. 538, no. 116235. https:\/\/doi.org\/10.1016\/j.epsl.2020.116235<\/a><\/p>\n\t

    Selected Awards and Academic Honors<\/h3>\n