1. Development of ATOVS Data Assimilation for Regional Forecast System Eunjoo Lee NWPD, KMA

2. Introduction of Regional Forecast System Regional Forecast System( 3hr-cycle run, 10km resolution ) 000306091215 18 212403 …… (D-Day) (D+1 Day ) Insufficient obs. data over the sea

3. 1DVAR for Regional Forecast System assimilated removed O NOAA-16, AMSU-A ch4~ch14, 06UTC/18UTC O Only over the sea and over the clear sky area ( Satellite data over the land or over cloudy area will be removed ) Land mask for 1DVAR

4. Flow Chart of 1DVAR Bg. Error Obs. Error Bias correction coeff. - Scan angle corr. - Air mas corr. 1DVAR Analysis (RTV-7) Regional 3DVAR Analysis Regional Model (Resolution : 10km) Obs. Increment(O-B) (1-month) ATOVS Data 24hr Fcst. F_24 – F_12 (1-month) Bg Fielld(6hr forecast) 결과보기 - ATOVS Data from GTS network ATOVS Data from GTS network - Directreadout ATOVS Data by KMA Directreadout ATOVS Data by KMA - ATOVS Data from GTS network ATOVS Data from GTS network - Directreadout ATOVS Data by KMA Directreadout ATOVS Data by KMA - Calculated ozone profile Calculated ozone profile instead of climatological ozone profile - Calculated ozone profile Calculated ozone profile instead of climatological ozone profile ( T,q )

5. Directreadout ATOVS Data O Retrieved by Remote Sensing Devision of KMA and Remote Sensing Lab of METRI O Needed to get more satellite obs data Directreadout ATOVS Data (NetCDF format)

6. Obs data number used 1DVAR Time series for satellite obs data number used in 1DVAR GTSGTS + Direct

7. TOMS OZONE DATA 1.25 X 1 grid data ZERO value

8. REFERENCE OZONE PROFILES 275325375425575 Total ozone amount : 125 – 175 – 225 – 275 – 325 – 375 – 425 – 475 – 525 - 575 Reference Ozone Profile at 75 N Pressure[hPa] Ozone amount[ppmv] Pressure[hPa] Ozone amount[ppmv] Reference Ozone Profile at 45N Ozone amount[ppmv] Pressure[hPa] Reference Ozone Profile at 15N

9. HOW TO GET NEW OZONE PROFILE 300 Dobson at 30N 45N 15N 275325 Dobson 275325 Dobson 300 30N 45N 15N 300 Dobson

10. Time series of obs increment AMSUA 4 AMSUA 5 AMSUA 6 AMSUA 7AMSUA 8AMSUA 9 AMSUA 10AMSUA 11AMSUA 12 AMSUA 13 AMSUA 14

11. Time series of analysis increment T_1000T_975T_925 T_900 T_850T_800 T_700T_500T_400 T_300 T_250 T_200 T_150 T_100 T_70 ( 15-layer Temp. )

12. Time series of analysis increment q_1000T_975T_925 T_900T_850 T_800 T_700T_500T_400 T_300T_250 ( 11-layer Specific Humidity )

13. Domain-averaged analysis Profile Analysis Time : 2005053018 6hourly, 10-day run

14. CNTL EXP GOES-9 WV image 3 hr accumulated rain NOAA 16 ATOVS, +12hr 3hr Precip. ( valid time : 2004081006) Obs (2004/08/10/06UTC) Comparison between Obs. & Forecast

15. Plans O Level 1C data assimilation O Direct radiance assimilation in Regional 3DVAR O Satellite data assimilation over land O Test of 1DVAR Impact on Typhoon forecast Satellite data assimilation Regional Forecast System