Global Atmospheric Circulation Patterns – Analyzing TRMM Data Eugenio Arima Environmental Studies Program.

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Presentation transcript:

Global Atmospheric Circulation Patterns – Analyzing TRMM Data Eugenio Arima Environmental Studies Program

Audience First/Second year undergraduate students Global Climate Change Class – Some “scared of” science Environmental Studies majors/minors – Many geoscience majors and a handful of humanities majors Could be used in Intro to Climatology class Disclaimer: I am NOT a climatologist, Geographer!

Goals After completing the exercise, students should: – Understand the most important global atmospheric circulation patterns and drivers Trade winds, regions of high/low pressure, Hadley cell, monsoonal circulation, orographic lifting, El Niño phenomena. – Course textbook: Ruddiman’s Earth’s Climate Past and Future Chapter 2: Earth’s Climate System Today

GIS Lab using TRMM data TRMM – Tropical Rainfall Measuring Mission – Several Instruments on board satellite: Radars & Sensors – Between 50 degrees North - South 1998 – today – Daily product – Monthly product 3B43 Lots of pre-processing prior to Lab: – HDF to TIFF format – Precipitation rate  Total – Monthly  Annual

Important Concepts Solar radiation: heat imbalances Atmospheric circulation redistribute energy/heat Source: Ruddiman (2001)

Important Concepts Hadley Cell, ITCZ, High/Low pressure Source: Ruddiman (2001)

Important Concepts Monsoonal Circulation Source: Ruddiman (2001)

Important Concepts Orographic precipitation Source: Ruddiman (2001)

Important Concepts El Niño Source: Ruddiman (2001)

Annual Precipitation Rasters

Calculate Mean Precipitation (“Normal”)

Rasters Visual Analysis Back to Concepts – ITCZ – Zones of high/low pressure Deserts Tropical regions

Anomalous Rainfall

Topography and Rainfall Orographic Lifting

Monsoonal Precipitation

Sample of Questions Asked Descriptive: describe main rainfall patterns What if scenarios: if trade winds are weakened and waters off the cost of Peru get warmer, what would you expect to occur? A little arithmetics: calculate how much liters of water in a given 0.25 x 0.25 degree cell.

How effective is the Lab? I haven’t used this full lab version I did use parts of it – Students like to manipulate images (zoom in/out, see different layers) – Better for visual analysis than figures in book – Anecdotal evidence suggests concepts were well understood