Tohono Oodham Nation Monsoon Climatology George Ackerman

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Tohono Oodham Nation Monsoon ClimatologyGeorge
Ackerman
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Purpose

• Develop monsoon climatology for TON
• Identify variables to predict onset and
  intensity

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• Monsoon start
• The word monsoon
• How the monsoon develops
• Subtropical Ridge moves north
• Wind shift from westerly to southerly/easterly
• Moisture inflow / surges
• Convective thunderstorms

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TON Location Map

• Generations
• Traditional crops
• Tepary, 60 d corn
• Runoff agriculture
• Diabetes
• Return to diet
• Return to Runoff
• Clim help Ag
• Study Location

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Data

• North American Regional Reanalysis (NARR) DVD,
  1979-2002, daily and monthly
• Monsoon onset dates from Marlow, daily data
• Antecedent (mam) dataset, monthly data
• Monsoon onset /- 30,60,90 day composite dataset,
  daily data

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Methodology

• Climatology- onset dates, composite dataset
  Grads were used
• By using the monsoon onset date
• Also maps were constructed showing correlation
• MAM and TON

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Climatology Relative Humidity
Time series
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Climatology Precipitation
Time series
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Tmp2m correlation
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Tmp2m onset correlation
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Summary

• Developed pre monsoon and monsoon climatology for
  the TON
• Examine the 1984 wet year compared to the
  climatology
• Examine antecedent variables for prediction of
  onset intensity
• NARR dataset was very useful
• More research is needed to identify variables to
  predict onset and intensity
• Talk to the elders about monsoon