Project:	Development and Deployment of Sensors for Measuring Carbon Dioxide in Rivers
Disciplines:	Environmental Science and Engineering, Geobiology
Mentor:	Woodward Fischer, Professor of Geobiology, (GPS), wfischer@caltech.edu
AO Contact:	Simon Andren, sandren@caltech.edu
Background:	Rivers are integral components of the global carbon cycle, acting not just as conduits transporting carbon but also as dynamic systems that emit significant amounts of carbon dioxide (CO₂) to the atmosphere. Recent studies have highlighted that CO₂ emissions from rivers are comparable to the ocean sink, underscoring the need for a deeper understanding of riverine carbon dynamics. Traditional methods of measuring dissolved CO₂ in rivers—such as spot sampling or calculations from pH and alkalinity—often miss critical diurnal variations, leading to underestimations of CO₂ fluxes. This research project focuses on continuing the development and deployment of automated sensor systems for continuous monitoring of dissolved CO₂ in river systems. By capturing high-resolution data, one can start to unravel the complex interplay of biological, chemical, and physical processes that control CO₂ concentrations in rivers. This understanding is crucial for accurately quantifying carbon fluxes and improving global carbon budget models.
Description:	We are seeking an undergraduate student to work on this project, both on the instrumentation and the deployment. The project will unfold in two key stages: Finalizing the Sensor System: Assembly and Calibration Laboratory Testing Address and optimize if needed Structuring and Conducting a Field Study: Study Design Field Deployment Data Analysis Interpretation Dissemination
Student Requirements:	This project is ideal for a student who wants large ownership of a project and who’s interested in hands-on work. The student will be exposed to various tools like soldering, programming, and fieldwork. Experience in any of these areas is a bonus. If interested, the project could start earlier than summer 2025 for a credited research experience.
Programs:	This AO can be done under the following programs:   Program    Available To        SURF    Caltech students only  Click on a program name for program info and application requirements.