Lecture, three hours; discussion, one hour. Requisite: course 200B. Global atmospheric circulation and its variability in changing climate. Topics include theory of Rossby waves and application to global circulation of atmosphere, dynamics of Hadley cell and monsoon circulations, wave-mean interaction and application to jets/storm tracks, energetics of eddies and available potential energy in atmosphere, and coupling among circulation, moisture, and clouds. S/U or letter grading.