Graphics Practice 2

In this session, you "complete" a graphic by importing and positioning it on a page and adding a cross-reference, figure title, and documentation to it. If you have any problems with this task, contact your instructor.

  1. Start a document that you create in your preferred word-processing software.
  2. Copy the text on El Niño into that file.
  3. Import the two graphics and position them in the appropriate spots within the text.
  4. Add cross-references from nearby text to these graphics.
  5. Construct figure titles with information about the source of these graphics. Don't just copy the source paragraph; use a standard citation system.
  6. Use either the full citation as you see in these eamples or the number system for the citation and assume that the source is 3 in the bibliographic list end of document.
  7. Name this file beginning with some identifiable part of your name followed by _graphicsformat2, and e-mail it to your instructor.


(Normal conditions)


(El Niño conditions)

One of the most important sources of year-to-year climate variation in the Southwest is the El Niño phenomenon of the tropical Pacific Ocean. El Niño is a natural but largely unpredictable condition that results from complex interplay among clouds and storms, regional winds, oceanic temperatures, and ocean currents along the equatorial Pacific.

Under "normal" conditions, the tropical trade winds blow from east to west, ponding up warm water in the western Pacific. In the eastern Pacific, the trade winds pull up cold, deep, nutrient-rich waters along the equator from the Ecuadorian coast to the central Pacific. The warmth of the western Pacific results in a particularly vigorous hydrologic cycle there with towering cumulus clouds and tropical storms that "radiate" atmospheric waves and disturbances across vast regions of the globe. Heat and moisture lofted into the upper atmosphere by the clouds and storms are distributed by high-altitude winds across vast regions of the globe.

During an El Niño, this situation is disrupted and the trade winds weaken, thus reducing the upwelling of cool waters in the eastern Pacific and allowing the pool of warm water in the west to drift eastward toward South America. As the central and eastern Pacific warms, atmospheric pressure gradients along the equator weaken, and the trade winds diminish even more. As the waters of the central and eastern Pacific warm, the powerful tropical Pacific storms begin to form farther east than usual. As the distribution of storms spreads east along the equator, their influence on global weather systems also changes. Most notably, for our purposes, the jet stream over the North Pacific Ocean is invigorated and pulled farther south than normal, where it collects moisture and storms and carries them to the southwestern United States and northern Mexico.




Graphics source: "Effects of El Niño on Streamflow, Lake Level, and Landslide Potential" by Richard Reynolds, Michael Dettinger, Daniel Cayan, Doyle Stephens, Lynn Highland, and Raymond Wilson of the U.S. Geological Survey. This document can be found at http://geochange.er.usgs.gov/sw/changes/natural/elnino/ and it is dated July 10, 1997.

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