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Tohono O’odham Monsoon Climatology Study

This study aims to develop a monsoon climatology for the Tohono O’odham Nation, identifying variables for onset prediction. Explore the monsoon's development, wind shifts, and moisture influx, crucial for traditional crop growth. Utilizing NARR data from 1979-2002, daily and monthly datasets were analyzed to create composite datasets and correlations for precipitation and temperature. Further research is needed to enhance prediction accuracy.

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Tohono O’odham Monsoon Climatology Study

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  1. Tohono O’odham Nation Monsoon ClimatologyGeorge Ackerman

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

  3. 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

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

  5. 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

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

  7. Climatology: Relative Humidity Time series

  8. Climatology: Precipitation Time series

  9. Tmp2m correlation

  10. Tmp2monset correlation

  11. 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

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