GEOG209 Lecture Notes - Lecture 9: Walker Circulation, Atmospheric Circulation, Nios Embedded Processor
6 Jul 2016
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Document Summary
Causes of climate variability are strongly time-scale dependent. Separation of geological from recent climate changes, and natural from anthropogenic (human) causes. Appreciation for different sources of historical hydroclimate data. Influence on regional hydroclimate from large-scale atmospheric teleconnections. Recent trends in hydroclimate variables, and lakes as indicators of climatic change. Many more oscillation patterns, over different regions of the world. Teleconnection: a climatic anomaly that is a distant consequence of another climatic anomaly . Focus on el nino and its remote influence. During the onset of an el nino event the trade winds weaken or reverse direction, causing warmer water to move from west to east across the tropical pacific. The region of maximum convection and precipitation follows the warmer waters and moves from the west to the central pacific. The result is that the walker circulation essentially becomes two circulation cells, one on either flank of the region of maximum convection.
