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Case Study: August 2005 moving precipitation system over West Africa

Case Study: August 2005 moving precipitation system over West Africa. Benjamin Lamptey NCAR (RAL) July 6, 2005 lamptey@ucar.edu. Motivation. Meso-scale (1000 – 100,000km2) – most disciplines and models can be integrated in AMMA Complies with both hydrologic and atmospheric model capabilities

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Case Study: August 2005 moving precipitation system over West Africa

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  1. Case Study: August 2005 moving precipitation system over West Africa Benjamin Lamptey NCAR (RAL) July 6, 2005 lamptey@ucar.edu

  2. Motivation • Meso-scale (1000 – 100,000km2) – most disciplines and models can be integrated in AMMA • Complies with both hydrologic and atmospheric model capabilities • Scale of MCS and many surface-atmosphere interactions • Scale to expected to directly benefit from EOP/SOP observations

  3. Objective • Compare atmospheric and hydrologic simulations between them and with observations • First step in science integration – will prepare further studies based on SOP observations • Need to validate MSAM outputs and ensure outputs comply with forcing of MSHM and vice-versa.

  4. Model • WRF version 2.1.2 • Grid resolution is 12 km, 4km • Grid size: 251x201, 216x196, 31 levels • BC and IC: NCEP and ECMWF • Period of simulation Aug. 27:00UTC to August 30:00UTC

  5. Simulation domain

  6. Satellite Evidence

  7. Animation 1 BMJ WSM6 ECMWF

  8. Animation 2 KF Lin et al. ECMWF

  9. Animation 3 KF Thompson ECMWF

  10. Animation summary

  11. 24-hour rain 6h-6h Aug 27 KF WSM6 ECMWF CPC WRF

  12. 24-hour rain 6h-6h Aug 28 KF WSM6 ECMWF WRF CPC

  13. Summary • WRF has the potential to simulate the moving rainfall system if an optimal model configuration for West Africa is obtained • There is a qualitative agreement between WRF and CPC data for the 24 hour rainfall

  14. To do list • Compare results with observations (making use of more variables) • Evaluation of analysis used to initialize the model –includes comparing simulation to analyses • To run WRF in an operational mode over Africa (any help with funding?): Technology Transfer? • WRFCM, CLM

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