Hyperspectral Water Vapor Radiance Assimilation

Hyperspectral Water Vapor Radiance Assimilation

Stratospheric Water Vapor James Jung Contributions From: Fanglin Yang, Shrinivas Moorthi, Yu-Tai Hou Paul Van Delst, David Groff, Andrew Collard, Daryl Kleist

NCEP Global Branch Meeting 7 October 2010 Outline Background Estimates/Results from research projects HALOE SAGE II

Estimates from IR radiance assimilation Forecast impacts Fits to observations. 2

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 3 IASI Jacobian for on-line water vapor channel 3327

4 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. 9 Res., 102, 105-118.

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

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

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

16 Colors are x10-6 [Kg/Kg] 17

Colors are x10-6 [Kg/Kg] 18 Model Statistics 19

April 2010 May 2010 June 2010

July 2010 20 my experiment and control Average PW differences between April 2010

May 2010 June 2010 July 2010 21

Average 6 hour rainfall differences between my experiment and Anomaly Correlations March - July 22

23 24 25 26

27 28 Questions ?

29

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