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Sensitivity of Simulated Philippine Rainfall to Model Resolution and Convective Closure Scheme

Sensitivity of Simulated Philippine Rainfall to Model Resolution and Convective Closure Scheme. JOSEFINA ARGETE Institute of Environmental Science and Meteorology University of the Philippines. ELLA CECILIA CASTILLO Climate Studies Division Manila Observatory. ANA LIZA SOLIS

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Sensitivity of Simulated Philippine Rainfall to Model Resolution and Convective Closure Scheme

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  1. Sensitivity of Simulated Philippine Rainfall to ModelResolution and Convective Closure Scheme JOSEFINA ARGETE Institute of Environmental Science and Meteorology University of the Philippines ELLA CECILIA CASTILLO Climate Studies Division Manila Observatory ANA LIZA SOLIS Climatology & Agrometeorology Branch PAGASA, Weather Bureau

  2. Objectives • To test the sensitivity of RegCM3 to different domain resolutions on Philippine rainfall • To test the sensitivity of the model to 2 convective closure schemes • To validate the model output with observed values (station data, CRU and XA)

  3. Brief Climatology • Northeast Monsoon Season – (Oct-Mar) • brings relatively warm & humid air masses e.g. much rainfall in northern and eastern part of the country. NCEP REANALYSIS North Pacific Trades – (Mar-Apr) NE monsoon weakens, islands under influence of trades, easterlies bring warmest air in the Phils. • Southwest Monsoon Season – (May-September) • peak in August, deep current up to 10,000m high • Almost all parts of the island receive high rainfall, max. at coasts and slopes directly exposed to the monsoon. NCEP REANALYSIS

  4. Methodology Input data: ET42, L15 (ECWCRP) GTOPO30_10MIN GLCC10MIN_BATS OISST Start date=1997052500 End date=1997070100 clat = 14 clon= 120 iproj=“ROTMER”

  5. Validation data • CRU monthly precip • Xie-Arkin monthly precip rate • Observed daily/monthly station rainfall

  6. RESULTS:

  7. 60

  8. 45

  9. 20

  10. PRCC at different Resolutions (FC)

  11. Convective Closure Scheme

  12. Domain for averaging daily rainfall

  13. CONCLUSIONS: • 60 & 45km res. runs captured the spatial pattern of rr ; details are more evident in 20km res.run • The run using Arakawa-Schubert Scheme simulated the Philippine rainfall better than the Fritsch-Chappel Scheme • In general, the model’s prca compared relatively well with the observed rainfall values but tended to overestimate • The same is true for convective precip (prcc)

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