Geosciences Department
Mason O. Stahl headshot

Mason O. Stahl

Job Title
James M. Kenney Associate Professor of Environmental Engineering
F.W. Olin Center 102A

Areas of expertise

Hydrogeology, Geochemistry, Surface Water Hydrology

Research interests

My research spans the fields of hydrogeology, geochemistry and water resources. I study how perturbations to the environment influence elemental cycling and the quality of our water resources. A main focus of my research has been on improving our understanding of the hydrologic and biogeochemical factors that result in the mobilization of naturally occurring arsenic from sediments into groundwater, which is a problem that threatens the health of millions of people around the world. One of the primary goals of my research is to help answer questions about how groundwater and surface water quality will change in response to natural and anthropogenic changes to the environment and what this means for the health of people and the environment.

Field Areas: Vietnam, Bangladesh, Cambodia, US

Teaching interests

ENS 100: Introduction to Environmental Science

ENS 215: Exploring Environmental Data

GEO/ENS 210: Groundwater Hydrology


(* = students):

(Select publications since 2019)

Stahl MO, McColl KA. 2022. The Seasonal Cycle of Surface Soil Moisture. Journal of Climate 35 (15): 4997–5012 DOI: 10.1175/JCLI-D-21-0780.1

Connolly CT, Stahl MO, *DeYoung BA, Bostick BC. 2022. Surface Flooding as a Key Driver of Groundwater Arsenic Contamination in Southeast Asia. Environmental Science & Technology 56 (2): 928–937 DOI: 10.1021/acs.est.1c05955

Stahl MO, *Wassik J, *Gehring J, *Horan C, Wozniak A. 2021. Connecting the Age and Reactivity of Organic Carbon to Watershed Geology and Land Use in Tributaries of the Hudson River. Journal of Geophysical Research: Biogeosciences 126 (9): 1–17 DOI: 10.1029/2021JG006494

Stahl MO, *Gehring J, Jameel Y. 2020. Isotopic variation in groundwater across the conterminous United States – Insight into hydrologic processes. Hydrological Processes 34 (16): 3506–3523 DOI: 10.1002/hyp.13832

Nghiem AA, Stahl MO, Mailloux BJ, Mai TT, Trang PT, Viet PH, Harvey CF, Geen A, Bostick BC. 2019. Quantifying Riverine Recharge Impacts on Redox Conditions and Arsenic Release in Groundwater Aquifers Along the Red River, Vietnam. Water Resources Research 55 (8): 6712–6728 DOI: 10.1029/2019WR024816

Stahl MO. 2019. Groundwater Pumping Is a Significant Unrecognized Contributor to Global Anthropogenic Element Cycles. Groundwater 57 (3): 455–464 DOI: 10.1111/gwat.12817

(* = students)

Additional media

Academic credentials

B.S., Tufts University; Ph.D., Massachusetts Institute of Technology