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Stratospheric Water Vapor

Stratospheric Water Vapor. James Jung Contributions From: Fanglin Yang, Shrinivas Moorthi , Yu-Tai Hou Paul Van Delst , David Groff, Andrew Collard, Daryl Kleist. Outline. Background Estimates/Results from research projects HALOE SAGE II Estimates from IR radiance assimilation

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Stratospheric Water Vapor

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  1. Stratospheric Water Vapor James Jung Contributions From: Fanglin Yang, ShrinivasMoorthi, Yu-Tai Hou Paul Van Delst, David Groff, Andrew Collard, Daryl Kleist NCEP Global Branch Meeting 7 October 2010

  2. Outline • Background • Estimates/Results from research projects • HALOE • SAGE II • Estimates from IR radiance assimilation • Forecast impacts • Fits to observations.

  3. Disclaimer • This is still WORK IN PROGRESS • Using infrared radiances to “estimate” stratospheric moisture in NWP is not being done by anyone else. • These are moisture ESTIMATES • Observations are not available • Derived from jacobian tails • Uses a nudging approach • 3 Sources of information • IASI (dominant) • AIRS • GPS-RO • RTM and CRTM are different • RTM -> GFS • CRTM -> GSI

  4. IASI Jacobian for on-line water vapor channel 3327

  5. From Halogen Occultation Experiment (HALOE)10 March 2005 ~70oS Latitude 2 [ppmv] = 1.24e-6 [Kg/Kg] 4 [ppmv] = 2.49e-6 [Kg/Kg] 6 [ppmv] = 3.73e-6 [Kg/Kg] 8 [ppmv] = 4.98e-6 [Kg/Kg]

  6. From Halogen Occultation Experiment (HALOE)14 November 2005 ~37oN Latitude 2 [ppmv] = 1.24e-6 [Kg/Kg] 4 [ppmv] = 2.49e-6 [Kg/Kg] 6 [ppmv] = 3.73e-6 [Kg/Kg] 8 [ppmv] = 4.98e-6 [Kg/Kg]

  7. Rind, D., E. W. Chiou, W. P. Chu, S. Oltmans, L. Lerner, J. C. Larsen, M.P. McCormick, and L.R. McMaster, 1993: Overview of the Stratospheric Aerosol and Gas Experiment II Water Vapor Measurements: Method, Validation, and Data Characteristics., J. Geophys Res., 98 4835-4874.

  8. Chiou, E.W., M.P. McCormick, and W.P. Chu, 1997: Global Water Vapor Distributions in the Stratosphere and upper Troposphere Derived from 5.5 Years of SAGE II Observations (1986-1991)., J. Geophys. Res., 102, 105-118.

  9. Pressure [hPa] Longitude averaged Colors are x10-6 [Kg/Kg]

  10. Pressure [hPa] Longitude averaged Colors are x10-6 [Kg/Kg]

  11. Colors are x10-6 [Kg/Kg]

  12. Colors are x10-6 [Kg/Kg]

  13. Colors are x10-6 [Kg/Kg]

  14. Colors are x10-6 [Kg/Kg]

  15. Colors are x10-6 [Kg/Kg]

  16. Model Statistics

  17. April 2010 May 2010 June 2010 July 2010 Average PW differences between my experiment and control

  18. April 2010 May 2010 June 2010 July 2010 Average 6 hour rainfall differences between my experiment and control

  19. Anomaly Correlations March - July

  20. Questions ?

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