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Development of ATOVS Data Assimilation for Regional Forecast System Eunjoo Lee NWPD, KMA
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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
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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
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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 )
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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)
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Obs data number used 1DVAR Time series for satellite obs data number used in 1DVAR GTSGTS + Direct
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TOMS OZONE DATA 1.25 X 1 grid data ZERO value
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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
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HOW TO GET NEW OZONE PROFILE 300 Dobson at 30N 45N 15N 275325 Dobson 275325 Dobson 300 30N 45N 15N 300 Dobson
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Time series of obs increment AMSUA 4 AMSUA 5 AMSUA 6 AMSUA 7AMSUA 8AMSUA 9 AMSUA 10AMSUA 11AMSUA 12 AMSUA 13 AMSUA 14
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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. )
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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 )
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Domain-averaged analysis Profile Analysis Time : 2005053018 6hourly, 10-day run
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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
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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
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