Education
 BS, University of Connecticut, 1980
 MA, Fairfield University, 1985
 MA, Boston University, 1988
 PhD, Boston University, 1991
Courses
Fall 2017
 MATH 234. Differential Equations
 MATH 302. Dynamical Systems
Notes

Jim Walsh Gives Talk
May 1, 2018Jim Walsh, professor of mathematics, gave a plenary talk at the 20th Annual Chicago Symposium Series on Excellence in Teaching Mathematics and Science: Research and Practice, held April 13 at Northeastern Illinois University/North Park University in Chicago. The symposium series has been convening math and science faculty from the Chicago area for the past twenty years with the goal of improving undergraduate math and science education in and around Chicago. Walsh spoke about his experiences teaching the mathematical modeling of climate.

Jim Walsh Publishes
October 27, 2017Jim Walsh, professor of mathematics, published the article "Diffusive Heat Transport in Budyko's Energy Balance Climate Model with a Dynamic Ice Line" in the Journal Discrete and Continuous Dynamical Systems—Series B. The paper concerns the mathematical analysis of a conceptual climate model that couples surface temperature to a dynamic ice sheet.

Jim Walsh presents at Society for Industrial and Applied Mathematics conference
November 14, 2016Professor of Mathematics Jim Walsh gave a mini tutorial titled Conceptual Climate Models at the Society for Industrial and Applied Mathematics conference, Mathematics of Planet Earth Conference held in Philadelphia. SIAM mini tutorials are presented to highlight a future direction or emerging area within applied mathematics. Walsh also coorganized a mini symposium at SIAM MPE16 titled Mathematics and Conceptual Climate Models.
On October 18, Walsh presented his current research in the Mathematics of Climate Seminar in the School of Mathematics at the University of Minnesota. In September, Walsh gave an invited talk in the Department of Mathematics at Boston University on recent work concerning a mathematical model of the glacial cycles.

Professor of Mathematics Jim Walsh Publishes
May 13, 2016Professor of Mathematics Jim Walsh served as lead author on the paper “Periodic Orbits for a Discontinuous Vector Field Arising from a Conceptual Model of Glacial Cycles,” which recently appeared in the mathematics journal Nonlinearity. The paper was coauthored by Esther Widiasih, Jon Hahn, and Richard McGehee.
Conceptual climate models provide an approach to understanding climate processes through a mathematical analysis of an approximation to reality. Recently, these models have also provided interesting examples of nonsmooth dynamical systems. In this paper, Walsh and his coauthors develop a new conceptual model of glacial cycles.
The model, consisting of a system of three ordinary differential equations defining a discontinuous vector field, provides a dynamical systems framework for a mechanism previously shown to play a crucial role in glacial cycle patterns, namely, an increased ice sheet ablation rate during deglaciations. Adhoc singular perturbation techniques are used to prove the existence of a large periodic orbit crossing the discontinuity boundary, provided the ice sheet edge moves sufficiently slowly relative to changes in the snow line and temperature.

Jim Walsh Publishes, Speaks
February 12, 2016The paper "Climate modeling in differential equations," written by Professor of Mathematics Jim Walsh, appeared recently in the Journal of Undergraduate Mathematics and Its Applications. The 38page "module" recounts Walsh’s efforts in bringing climate modeling into Oberlin's Math 234 Differential Equations course.
Walsh also spoke in January at the annual Joint Meetings of the American Mathematical Society (AMS) and Mathematical Association of America (MAA) in Seattle, describing his new course Math 305 Mathematics of Climate Modeling in the MAA Session Mathematical Modeling in the Undergraduate Classroom.

Jim Walsh Profiled
December 3, 2015Professor of Mathematics Jim Walsh was profiled by the Mathematics and Climate Change Research Network (MCRN) about his climatemodeling research. Walsh has been a member of MCRN since 2011, and he currently coorganizes a weekly webinar that focuses on mathematical models arising in the study of paleoclimate.

Jim Walsh Publishes, Speaks at Workshop
October 6, 2015The paper “On the BudykoSellers energy balance climate model with ice line coupling” by Professor of Mathematics Jim Walsh (lead author) and Christopher Rackauckas ’13 appeared in the September issue of Discrete and Continuous Dynamical Systems  Series B (DCDSB). The paper presents an analysis of a mathematical model of an ice sheetsurface temperature coupled model. This work was carried out with Rackauckas.
Walsh was also invited to participate in a Mathematics of Planet Earth 2013 workshop held September 30October 2 at the National Institute of Mathematical and Biological Synthesis in Knoxville, Tennessee. At the workshop, Walsh spoke about the Mathematics and Climate Research Network, an organization funded by an award from the National Science Foundation’s Division of Mathematical Sciences of which he is a member.

Jim Walsh Gives Talk
March 9, 2015On March 8, Professor of Mathematics Jim Walsh gave a talk in a special session on conceptual mathematical models in climate science at the 2015 American Mathematical Society Spring Eastern Sectional Meeting at Georgetown University. The talk, "New Budykotype models of a Slushball Earth," recounted recent work with Christopher Rackauckas '12 in which two new mathematical models were developed that each reproduce ice sheet behavior known to have occurred in the extensive glacial epochs of the Neoproterozoic Era, during which time continental ice sheets flowed into the ocean near the equator.

Jim Walsh Publishes and Presents
January 29, 2014Professor of Mathematics Jim Walsh was lead author on the paper “A dynamics approach to a low order climate model,” which appeared recently in the journal Discrete and Continuous Dynamical Systems Series B. The paper presented the mathematical analysis of a model focused on the extensive glacial events of the Neoproterozoic Era. Walsh also gave two presentations at the 2014 Joint Mathematics Meeting, held January 15 to 18 in Baltimore. The first talk, given in the AMS Session on Fractal Geometry, Complex Dynamics, and Dynamical Systems, concerned research with Chris Rackauckas ’13 on the Jormungand climate model. The second talk was given in an MAA Session titled Undergraduate Sustainability Experiences in the Introductory Mathematics Classroom.This talk recapped Walsh’s experience incorporating climate modeling into his MATH 234 course.