# Teaching ## Active Courses Open all sections Close all sections ### EPS 53: Marine Geochemistry expand\_more **EPS 53: Marine Geochemistry** **Description:** An introduction to low temperature biogeochemistry. We will focus on key biogeochemical elements and look to understand the linkages between the biosphere, atmosphere and hydrosphere. The course begins with a description of marine geochemistry (alkalinity and chemical fluxes) and works toward understanding isotopic fractionation and what it can tell us about the environment. We will explore biogeochemistry over a range of physical and temporal scales. Note: This course includes a weekly two-hour lab to be arranged and prepares students for EPS 187. This course fulfills the EPS sub-discipline requirement of either Oceans and Atmosphere(s) or Earth History and Geobiology. Given in alternate years. ### EPS 56: Geobiology and the History of Life expand\_more **EPS 56: Geobiology and the History of Life** **Description:** Within our solar system, Earth is distinguished as the planet with life. Life was born of planetary processes, has been sustained for some four billion years by planetary processes, and through time has emerged as a set of planetary processes that is important in its own right. In this course we will investigate the ways that earth and life interact, focusing in particular on the biogeochemical cycles of major elements. This will provide a framework for interpreting the history of life reconstructed from fossils and phylogeny. **Prerequisite(s):** EPS 21, 22, or Life Sciences 1b; or permission of instructor **Note:** This course is also offered as OEB 56 (eligible for cross-registration.) Students may take both EPS 56 and OEB 56 for credit. ### EPS 189: Analytical and Field Methods in Geobiology expand\_more **EPS 189: Analytical and Field Methods in Geobiology****Description:** Introduction to geobiological research methods: We will learn low temperature geochemical techniques, light stable isotope mass-spectrometry, and other microbiology methods commonly used in geobiological research. The focus will be on the cycling of biogeochemical elements (O, C, S, and Fe) in marine sediments throughout Earth history. ***Prerequisite**:* EPS 186 and EPS 187 (or equivalent) recommended. ### EPS 286: Stable Isotope Fractionation in Multiple Isotope Systems expand\_more **E-PSCI 286: Stable Isotope Fractionation in Multiple Isotope Systems** **Course Description:** Stable isotope systems serve as one of our most powerful tools in reconstructing both Earth History and environmental/climatic change over nearly all timescales. These isotope systems are driven by basic physical chemical principles that if understood, allow even more to be drawn from core isotopic systems (namely the biogeochemical elements – C, H, N, O, S). Further, advances in mass spectrometry now allow for site-specific isotopic determinations, as well as the quantification of trace isotope bonding (clumping). This course will begin with a quick but rigorous review of the chemistry underpinning equilibrium and kinetic isotope effects, before moving to survey the systematics that govern the most popular low temperature isotope systems. From there, the bulk of the course will target new and emerging isotopic targets such as clumping in O2 and methane. ### EPS 286r: Current Topics in Biogeochemistry I: Biological and Inorganic Stable Isotope Systematics expand\_more **EPS 286r: Current Topics in Biogeochemistry I: Biological and Inorganic Stable Isotope Systematics** **Description:** This is a reading class aimed at touring the literature on light stable isotope systematics. Topics covered will range from classic applications in geology (diagenetic and high temperature exchange), through to more novel isotope systems (clumping, 17O, etc.) and applications in biological systems (for instance, those effects associated with RuBiSCo). Topics covered will also flex with the interest of the enrolled students. ***Prerequisite:*** EPS 186 and 187 or equivalent; or permission of instructor. ### EPS 287: Low Temp Biogeochemistry II: Modern and ancient biogeochemical processes expand\_more **EPS 287: Current Topics in Biogeochemistry II: Role of he Biological Pump in the Carbon Cycle** **Description:** An intensive reading course that will compare modern oceanographic approaches to the biological pump with concepts of the size and function of the biological pump over geologic time. We will review the carbon cycle; carbon, nitrogen, and oxygen isotope proxies; and will stress simple calculations and limited box models. This will be a seminar class focused on discussion rather than lecture. Assessment will be based on participation, several short problem sets, and a term paper. ## Retired Courses Open all sections Close all sections ### EPS 107: Environmental Geochmistry expand\_more **EPS 107: Environmental Geochmistry** **Description:** origin, evolution, dispersal, paleoecology and geologic history of the major groups of the plant kingdom. Laboratory study of representative groups, living and fossil. ***Note:*** This course is no longer cross-listed and now offered as OEB 107. ***Prerequisite:*** OEB 10 or permission of instructor ### EPS186: Low Temperature Geochemistry I: Intro to Biogeochemical Cycles expand\_more **EPS 186: Low Temperature Geochemistry I: Intro to Biogeochemical Cycles** **Description:** An introduction to low temperature biochemistry. We will focus on key biogeochemical elements and look to understand the linkages between the biosphere, atmosphere and hydrosphere. The course begins with a description of marine geochemistry (alkalinity and chemical fluxes) and works toward understanding isotopic fractionation and what it can tell us about the environment. We will explore biogeochemistry over a range of physical and temporal scales. **Prerequisite(s):** A course in college chemistry is recommended. **Note:** This course serves to prepare students for [EPS 187](http://www.registrar.fas.harvard.edu/courses-exams/course-catalog/earth-and-planetary-sciences-187-low-temperature-geochemistry-ii-modern) (offered in Spring)