1. KMA’s GSICS and SCOPE-CM Activities Presented to CGMS-42 Working Group II/3

2. Contents GSICS activities Visible channel calibration
Infrared channels calibration
GSICS website
Contribution to SCOPE-CM
An effect of GSICS correction on Level 2 products
Contents

3. Visible channel calibration (1/3)
Vicarious calibration for visible channel using 5 targets. - ocean, desert, water cloud, deep convective cloud (DCC), moon
Target
Ocean
Desert
Water cloud
Deep convective cloud
Moon
Period
April 2011 ~ Present
Source
Regular observation
Special obs.
(twice a month)
Obs.
- Pacific Ocean
- Indian Ocean
- Simpson Desert
in Australia
- Over ocean regions
- Overcast clouds
- High reaching overcast clouds
- moon

4. a scatter plot for 30 days data trend of slope for long period
Visible channel calibration (2/3)
Monitoring the slope changes from scatter plot of 4 targets
The slope is obtained using 30 days average.
a scatter plot for 30 days data
get a slope/intercept
trend of slope for long period
Ocean
Desert
Water Cloud
DCC
RTM Simulated reflectance
COMS Observed reflectance –

5. Lunar calibration by collaborate with EUMETSAT
Visible channel calibration (1/3)
period: –
degradation: 5.59% (2.10%/year) from 4 targets on the Earth
3.47% (1.22%/year) from the moon targets
daily slope
from 4 targets
monthly ratio
from moon targets
slope =
degradation = 5.59%
slope =
degradation = 3.47%
Lunar calibration by collaborate with EUMETSAT
DCC method by collaborate with NOAA

6. Infrared channel calibration (1/2)
Preparation for the demonstration mode for COMS IR calibration
GEO-LEO Inter-calibration (IASI and AIRS)
IR1 (10.8μm)
IR2 (12.0μm)
BOTH
IASI
AIRS
IR1
Number
127948
47072
80876
Bias
0.2468
0.2906
0.2212
RMSE
1.5455
1.5546
1.5402
IR2
133908
49332
84576
0.2171
0.2213
0.2146
1.4138
1.4237
1.4079
IR3
(WV)
66436
23775
42661
-1.002
1.2263
1.0888
1.2965
IR4
(SWIR)
55038
24530
30508
0.1083
0.0215
0.1780
2.8551
2.4973
3.113
LEO TB (K)
mean bias
RMSE
mean bias
RMSE
AIRS IASI
WV (6.75μm)
SWIR (3.75μm)
LEO TB (K)
mean bias
RMSE
mean bias
RMSE
COMS TB (K)
COMS TB (K)

7. To add GSICS operation system for IASI-B
Infrared channel calibration (2/2)
Time series of TB bias ( – )
TB Bias (COMS-LEO)
AIRS IASI BOTH
(K)
mean Bias WV
IR1
mean Bias
mean Bias
IR2
mean Bias
SWIR
To add GSICS operation system for IASI-B
To compare double difference with LEOs (AIRS, IASI-A, and IASI-B)
To be ready to enter the demonstrate mode in 2014

8. KMA webpage
Infrared
Visible
2013, completely construct
web presenting system
(IR and VIS)

9. processing & Validation
Contribution to SCOPE-CM
In response to WG II Action Item 41.23:
“KMA to provide paper on their contribution to SCOPE-CM to the next CGMS session – CGMS-42”
To investigate an effect of GSICS calibration coefficient on Level2 products
Test product: Sea Surface Temperature (SST)
Validation data: buoy around East Asia
Period:
COMS
Level 1B TB
GSICS correction
SST
(IR1, IR2)
raw data
correction
processing & Validation
Buoy

10. Contribution to SCOPE-CM
Comparison of recalibrated SST with observed buoy SST
daytime
nighttime
Before
After
Before
After
0.81 K
0.94 K
RMSE 0.90 K
0.01 K
-0.01 K
Bias 0.28 K
-0.02 K
To investigate an effect of Clear Sky Radiance (CSR) and Atmospheric Motion Vector (AMV) on NWP in 2014

11. Thank you
Thank you for listening this talk.