The midterm exam will be given Thursday, **March 22 at 6 pm in Keyes 102. **The exam will be written to take 1 hr, but you will have 2 hours to complete it. If anyone requires special accommodations, please let me know.

The exam questions will be most similar to the homework assignments in that they will be short/long answer problems and questions (i.e., not multiple choice like the readiness quizzes). Some of what we have learned is quantitative (for example: box models, calculating mixing ratios or concentrations, equilibrium temperature, etc.) and some of it is descriptive (for example, explaining feedback cycles or describing atmospheric trends.) You should expect questions that require both of these and connect them together, for example by calculating a lifetime associated with a change and then interpreting the result in terms of its effects on the system (the nitrogen cycle problem on the HW is an example of this).

Here is a Study Guide for the material on the exam. It is intended to be a guide to the major concepts, ideas, and methods we have discussed and used so far in the course. As a disclaimer, it does not include every piece of information presented in lecture or in the reading, which may appear on the exam. (Note that only the first half of VL Chapter 2, thru p 29, will be on the exam. The remainder of Ch 2 will not be covered.) In the left column, I’ve provided a reference to the reading, class slides, class activities, or homework problems that relate to each topic. In studying for the exam you should aim to review and synthesize information into your own cohesive body of knowledge. This study guide is intended to provide a framework for this process. Hence, I have intentionally posed questions and left things for you to fill in. Feel free to download this document and modify it or fill it in as you wish (but be warned the formatting is a bit finicky!)

The following are equations and relationships you are expected to know for the exam. I may also ask you to use other equations from the material, but these will be provided if needed. You should remember the equations for residence time and the steady state concentration for a box model, how to calculate number density and mixing ratio, the chemical reaction for photosynthesis/aerobic respiration, how to assign oxidation states, mole fractions of the top 4 atmospheric gases (not including H2O), the height of the tropopause and height ranges for the troposphere and stratosphere.

I am available to answer any questions you have. **Office hours this week will be Monday, 3:30-5 pm, Tuesday 5 – 6:30 pm,Wednesday 3:30 – 4:30 pm, and Thursday 12:15 – 2:00 pm.** Also, feel free to email me with questions or to set up an appointment.

Happy Studying!