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JMA’s ATMOSPHERIC MOTION VECTORS In Response to Action 40.22 CGMS-41 / JMA-WP-05

JMA’s ATMOSPHERIC MOTION VECTORS In Response to Action 40.22 CGMS-41 / JMA-WP-05. Participation in the 2 nd AMV Inter-Comparison Study. JMA/MSC computed Meteosat-9 AMVs from designated imagery data using JMA AMV algorithm

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JMA’s ATMOSPHERIC MOTION VECTORS In Response to Action 40.22 CGMS-41 / JMA-WP-05

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  1. JMA’s ATMOSPHERIC MOTION VECTORSIn Response to Action 40.22CGMS-41 / JMA-WP-05

  2. Participationin the 2nd AMV Inter-Comparison Study • JMA/MSC computed Meteosat-9 AMVs from designated imagery data using JMA AMV algorithm • The computed AMV dataset was submitted to NWCSAF/AEMET for the 2nd inter comparison study at end of December 2012

  3. Height assignment scheme using maximum likelihood estimation method for Himawari-8 AMV • mathematical description of relationships between observables and latent variables • (transformation from physical model to equations and inequalities) • constructing likelihood function from above mathematical relationships • (transformation from equation and inequalities to PDF) • locating latent variables to maximize the likelihood function • (searching optimal parameters to explain observed observables)

  4. AMV derivation experiment using new tracking and HA technique • Satellite : MTSAT-2 • Period : July 2012 (summer)and January 2013 (winter) • Tracking method • RTN : Cross-Correlation, 16x16 pixels • TEST : Cross-Correlation, MLE using 5x5 and 15x15 pixels • Height assignment method • RTN : operational method • TEST : • Cloud alignment model : 3 layers • PDF : multivariate student t distribution (t=1) • Optimization method : Nelder-Mead

  5. IR upper level AMV sonde statistics for January 2013 RTN TEST Method : Comparison of rawinsonde winds with AMV winds within 150 km radius of a RAOB site Filters : VERT. DIST.(>=700hPa) < 50 (hPa) VERT. DIST.(<700hPa) < 35 (hPa) QUALITY >= 85 0.5*0.5 deg. latitude/longitude grid point data SPEED DIFF. < 30 (m/s) - DIRECTION DIFF. < 90 (deg)

  6. IR upper level AMV O-B statistics for January 2013 Root Mean Square Vector Differences RTN TEST Negative Wind Speed BIAS decreased around Jet stream

  7. IR upper level AMV O-B statistics for January 2013 Wind Speed BIAS RTN TEST Negative Wind Speed BIAS decreased around Jet stream

  8. IR upper level AMV O-B statistics for January 2013 Wind Speed BIAS for each levels RTN TEST Full Disk NHTROPSH

  9. IR upper level AMV O-B statistics for January 2013 Wind Speed BIAS RTN TEST

  10. IR upper level AMV O-B statistics for January 2013 Root Mean Square Vector Differences for each levels RTN TEST Full Disk NHTROPSH

  11. Future Plan for Himawari-8 AMV • Experimental AMV derivation from MSG • Comparisons against CALIPSO and MODIS cloud products • Analysis to values of Maximum Likelihood function • Development to Quality Control Method • Introduction of advanced cloud physics processes

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