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GOES TPW validated using ARM MWR TPW

GOES TPW validated using ARM MWR TPW. Zhenglong Li, Jun Li, Yong- Keun Li CIMSS. Note. CART ARM site only Ground-based microwave (MWR) measured TPW as true April 2010 – March 2011 Clear sky only; uses GOES Sounder cloud mask

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GOES TPW validated using ARM MWR TPW

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  1. GOES TPW validated using ARM MWR TPW Zhenglong Li, Jun Li, Yong-Keun Li CIMSS

  2. Note • CART ARM site only • Ground-based microwave (MWR) measured TPW as true • April 2010 – March 2011 • Clear sky only; uses GOES Sounder cloud mask • LI PhyReg: Li physical retrieval using regression as first guess

  3. TPW statistics

  4. MWR VS GFS

  5. MWR VS LI Phy REG

  6. MWR VS LI Phy GFS

  7. MWR VS Ma Phy

  8. MWR VS GPS

  9. GPS VS GFS

  10. GPS VS LI PhyReg

  11. GPS VS LI Phy GFS

  12. GPS VS Ma

  13. Summary • Precision: • GPS > Li PhyReg > GFS > Li Phy GFS > Ma Phy • Accuracy: • GPS appears too dry, larger than 1 mm bias, and bias is larger in moist condition • The GOES sounding appears SLIGHTLY moist • Factors affecting the GOES sounding statistics include: • Point VS area measurements • Cloud contamination • Suggest to use Li PhyReg

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