This book introduces large-scale tropical climate circulation and its variations, covering their fundamental aspects and our current understanding of how they are impacted in a warming world. The readers will gain a comprehensive understanding of tropical climate variability from the book with its unique style of laying equal emphasis on relevant atmospheric and oceanic processes of tropical phenomenon that span from the meso to the planetary scales. The book will appeal to senior undergraduate and graduate students in Meteorology, Oceanography, Geography, Hydrology, Environmental Science and more broadly in Geoscience.