JMA’s ATMOSPHERIC MOTION VECTORS

In Response to Action 40.22

CGMS-41 / JMA-WP-05

Participation in 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

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)

AMV derivation experiment using new tracking and HA technique

Satellite : MTSAT-2Period : July 2012 (summer)　 and January 2013 (winter)

• Tracking methodRTN : Cross-Correlation, 16x16 pixelsTEST : Cross-Correlation, MLE using 5x5 and 15x15 pixels

• Height assignment methodRTN : operational methodTEST : Cloud alignment model : 3 layers PDF : multivariate student t distribution (t=1) Optimization method : Nelder-Mead

HIGH LEVEL

　 FULL DISK NH TROP SH 　 FULL DISK NH TROP SHMVD 4.91 7.27 4.49 5.56 MVD 4.98 6.17 4.6 5.79RMSVD 5.89 8.53 5.31 6.6 RMSVD 5.94 7.35 5.42 6.78BIAS -0.68 -0.03 -0.9 0.96 BIAS -0.23 -0.84 -0.13 0.41SPD 16.47 37.35 12.45 27.1 SPD 19.39 36.47 14.23 27.18NC 6396 814 5210 372 NC 4970 961 3677 332

MEDIUM LEVEL

　 FULL DISK NH TROP SH 　 FULL DISK NH TROP SHMVD 7.59 8.49 4.26 4.83 MVD 5.12 5.37 3.95 6.21RMSVD 9.39 10.31 4.75 5.62 RMSVD 6.07 6.32 4.67 7.1BIAS -2.07 -2.92 0.61 1 BIAS 1.12 1.34 -0.09 2.51SPD 24.32 27.06 9.03 21.61 SPD 20.86 23.9 9.53 24.65NC 832 642 99 91 NC 867 618 187 62

IR upper level AMV sonde statistics for January 2013

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)

RTN TEST

RTN TEST

IR upper level AMV O-B statistics for January 2013

Root Mean Square Vector Differences

Negative Wind Speed BIAS decreased around Jet stream

RTN TEST

IR upper level AMV O-B statistics for January 2013

Wind Speed BIAS

Negative Wind Speed BIAS decreased around Jet stream

RTN TEST

IR upper level AMV O-B statistics for January 2013

Full Disk NH TROP SH

Wind Speed BIAS for each levels

RTN TEST

IR upper level AMV O-B statistics for January 2013

Wind Speed BIAS

RTN TEST

IR upper level AMV O-B statistics for January 2013

Full Disk NH TROP SH

Root Mean Square Vector Differences for each levels

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