170 likes | 375 Views
Status of AMDAR Implementation in Japan. Prepared for APSDEU-6 Seoul, Korea, 1 June 2005. , Forecast Department, Japan Meteorological Agency. History of AMDAR in JMA. 1992 ~ : ASDAR collection via GMS and dissemination via GTS.
E N D
Status of AMDAR Implementation in Japan Prepared for APSDEU-6 Seoul, Korea, 1 June 2005 , Forecast Department, Japan Meteorological Agency
History of AMDAR in JMA • 1992~ : ASDAR collection via GMS and dissemination via GTS. • mid 1990’s :Started contact with airlines, and many impact studies performed with off-line ACARS data. • 2002 : Agreement with JAL for experimental on-line use of ACARS. • 2003 : Agreement with ANA. • Aug 2004 : Started dissemination via GTS in FM42 form. • Mar 2006 : Planned to disseminate in BUFR form.
Available Data • Coverage: Within the reach of VHF data link mainly in Japan. • Data collection strategy: - For flight operation of each airline. - Ascent, descent data are collected by one airline. - QNH correction <= 14,000ft DES JP9Z4UU5 2620N 12802E 050239 F/// PS090 235/013 TB/ S031 333 F100 VG///=
Current AMDAR Encoding JMA ACARS Met. Data Receiver ACARS to AMDAR Conversion ACARS Data Link Provider N A P S M S S G T S Elimination Filter Elimination List
BUFR Encoding (Plan ) Civil Aviation Bureau JMA G T S MSS ACARS Data Link Provider METAR QNH Decoder BUFR Encoder Elimination Filter N A P S Height Correction (Height to Pressure Level) Elimination List ACARS Met. Data Processor
Impact to NWP • Greatest impact to the JMA Mesoscale model (MSM): • ( J-AMDAR coverage / Model domain ) is large.- Hourly data can be fully ingested to 4D-variational analysis.
Data coverage for MSM - Radar/AMeDAS rain rate is also assimilated into MSM
Diurnal change of data coverage for MSM 00UTC 06UTC DAY NIGHT 12UTC 18UTC
Daily error sequence on upper air wind(FL210 – FL450)Mesoscale model (00UTC initial), vs ACARS Lines indicate errors averaged over 25days before and after Aug 26. Dots indicate daily errors Month/day in 2002 Start using ACARS
Statistical verification on upper wind forecastComparison between Sep-Oct (with ACARS) and Apr-May (w/o ACARS) Mesoscale Model 250hPa wind forecast error vs radiosonde indicatesforecast from 18UTC (03 Local time) initial Error reduction was small for 18UTC initial (ACARS not available)
Oct 21, 2002 00UTC initial T=3 図3 MOD CAT w/o ACARS V With ACARS MOD CAT V
New product: hourly wind analysis 3D-OI based on Mesoscale modelwith ACARS, Wind profiler, Doppler Radar.
CYCLE ANALYSIS Decoded Used Rejected Decoded Used Rejected EARLY ANALYSIS Data monitoring of AMDAR for GSM 13 APR 2005 - 24 MAY 2005 - Used data are about 20% of decoded data due to thinning - Very few data rejected in the assimilation system imply the data quality is excellent
AMDAR as verification data for GSM MEAN: 0.5K, RMSE: 1.6K for APR 2004 MEAN: 0.2K, RMSE: 1.5K for APR 2005 Better consistency between AMDAR observation and first guess implies improvement of model performance.