Development of ATOVS Data

Assimilation

for Regional Forecast System

Eunjoo Lee

NWPD, KMA

Introduction of Regional Forecast System

Regional Forecast System( 3hr-cycle run, 10km resolution ) Regional Forecast System( 3hr-cycle run, 10km resolution )

00 03 06 09 12 15 18 21 24 03 ……

(D-Day) (D+1 Day )

< BG. Field >

< 24hr Fcst. >

< Time(UTC) >

Insufficient obs. data over the sea

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 1DVARLand mask for 1DVAR

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- Directreadout ATOVS Data by KMA

- ATOVS Data from GTS network- Directreadout ATOVS Data by KMA

- Calculated ozone profile instead of climatological ozone profile

- Calculated ozone profile instead of climatological ozone profile

( T,q )

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)Directreadout ATOVS Data (NetCDF format)

Obs data number used 1DVAR

Time series for satellite obs data number used in 1DVARTime series for satellite obs data number used in 1DVAR

GTS GTS + Direct

TOMS OZONE DATA

1.25 X 1 grid data

ZERO value

REFERENCE OZONE PROFILES Total ozone amount : 125 – 175 – 225 – 275275 – 325325 – 375375 – 425425 – 475 – 525 - 575575

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

HOW TO GET NEW OZONE PROFILE

300 Dobson at 30N

45N

15N

275 325 Dobson

275 325 Dobson

300

300

30N

45N

15N

300 Dobson

Time series of obs increment

Time series of obs increment

AMSUA 4 AMSUA 5 AMSUA 6

AMSUA 7 AMSUA 8 AMSUA 9

AMSUA 10 AMSUA 11 AMSUA 12

AMSUA 13 AMSUA 14

Time series of analysis increment

Time series of analysis increment

T_1000 T_975 T_925

T_900 T_850 T_800

T_700 T_500 T_400

T_300 T_250 T_200

T_150 T_100 T_70

( 15-layer Temp. )

Time series of analysis increment

Time series of analysis increment

q_1000 T_975 T_925

T_900 T_850 T_800

T_700 T_500 T_400

T_300 T_250

( 11-layer Specific Humidity )

Domain-averaged analysis Profile

Analysis Time : 20050530186hourly, 10-day run

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 Comparison between Obs. & Forecast

Plans

O Level 1C data assimilationO Direct radiance assimilation in Regional 3DVARO Satellite data assimilation over land

O Test of 1DVAR Impact on Typhoon forecast

Satellite data assimilationSatellite data assimilation

Regional Forecast SystemRegional Forecast System