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Status of AMDAR Implementation in Japan

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.

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Status of AMDAR Implementation in Japan

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  1. Status of AMDAR Implementation in Japan Prepared for APSDEU-6 Seoul, Korea, 1 June 2005 , Forecast Department, Japan Meteorological Agency

  2. 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.

  3. 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///=

  4. System Overview

  5. 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

  6. 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

  7. 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.

  8. Data coverage for MSM - Radar/AMeDAS rain rate is also assimilated into MSM

  9. Diurnal change of data coverage for MSM 00UTC 06UTC DAY NIGHT 12UTC 18UTC

  10. 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

  11. 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）

  12. Oct 21, 2002 00UTC initial T=3 図３ MOD CAT w/o ACARS V With ACARS MOD CAT V

  13. New product: hourly wind analysis 3D-OI based on Mesoscale modelwith ACARS, Wind profiler, Doppler Radar.

  14. 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

  15. 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.

  16. Thank you!

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