MJO.lecture_2010_v2

MJO.lecture_2010_v2 - TheMaddenJulianOscillationMJO

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The Madden-Julian Oscillation MJO The Madden-Julian Oscillation MJO Collaboration from Dr. Charles Jones Collaboration from Dr. Charles Jones Earth Research Institute (ERI) Earth Research Institute (ERI) University of  California University of  California Santa Barbara Santa Barbara
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OUTLINE What is the Madden-Julian Oscillation? How can we use statistics to find out the  existence of oscillations in the atmosphere and  ocean? How was the MJO discovered? What are the worldwide impacts of the MJO? Should I be concerned about the MJO?? Why?? 2
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SELECTED WEBSITE ON THE TOPIC FOR AN  INTRODUCTORY REVIEW : HTTP://ENVAM1.ENV.UEA.AC.UK/MJO.HTML CREDITS TO PROF. ADRIAN MATTHEWS UNIVERSITY OF EAST ANGLIA ALL ANIMATIONS AND RESPECTIVE  EXPLANATIONS  INCLUDED IN THIS  LECTURE ARE DISCUSSED IN THE WEBSITE  ABOVE 3
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RELEVANT CONCEPTS ABOUT THE  ATMOSPHERE AND OCEANS The tropical atmosphere-ocean system varies on many time  scales, including: The diurnal or daily cycle The diurnal or daily cycle , forced by the  daily cycle of  the sun  due to the rotation of the Earth about its axis Synoptic weather systems  Synoptic weather systems  (e.g., tropical cyclones,  hurricanes, typhoons, and others) that  last up to a few  last up to a few  days days Intraseasonal or month-to-month variability  Intraseasonal or month-to-month variability  (the  Madden-Julian oscillation) ( typically ~20-100 days ). The seasonal/annual cycle The seasonal/annual cycle , forced by the  annual cycle  annual cycle  of the sun  of the sun  due to the rotation of the Earth about the sun. Interannual or year-to-year  Interannual or year-to-year  variability, such as El Nino. 4
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WHAT IS THE MADDEN-JULIAN  OSCILLATION? MJO rainfall cycle The MJO is characterized by  an  eastward  propagation of tropical deep  convection/rainfall anomalies  over the "warm pool"  region from the Indian Ocean to the western Pacific.  A composite mean MJO cycle, calculated by averaging  over many individual MJO events, is shown in the  animation. The animation is on an endless loop,  showing images every 3 days through the MJO cycle  from "day -24" through "day 0" to "day 24", i.e., the  MJO has an average life time from the start of one  event to the end of about 48 days.  5
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AND ANOMALIES (LEGEND IS IN MM DAY -1 ). BOTTOM: RED (DRY)  BLUE (WET). 6
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MJO.lecture_2010_v2 - TheMaddenJulianOscillationMJO

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