GCOM-C Update TANAKA, Kazuhiro GCOM project manager - Joint PI Workshop Jan 18, 2021 - JAXA/EORC
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GCOM-C Update
TANAKA, Kazuhiro
GCOM project manager
Joint PI Workshop Jan 18, 2021
1
GCOM-C Status
◼ Successful launch on Dec. 23, 2017
◼ SGLI First Light on Jan. 1, 2018. → stable operation in 3 years
◼ SGLI ALL 29 products are in public since Dec. 20, 2018 as Ver.1.
◼ Ver.2 data release on June 29, 2020 as planned
GCOM-C Launch
H-IIA rocket F-37
01:26:22 UTC
On Dec. 23, 2017
Japanese name
Everything is nominal “SHIKISAI”
as planned.
2
GCOM-C Products
◼ Approx. 100GB/day data is downlinked via Svalbard Station.
◼ Approx. 1TB/day products in 156 folders are generated in GCOM-C
ground system.
1TB/day
GCOM-C
“SHIKISAI”
Raw Data L1B（１） NRT (13)
100GByte
Statistics Processing … etc
(per day)
LAND（9） L1B (2)
ATMOS（8） L2 (16)
> 1000km Geo
19 channels ＆
L2 Statics
Radio OCEAN（7） L2 global (42)
Process
CRYOS（4） L3 (83)
Ground
156 folders
System 29 Products
@ G-Portal 3
Satellite operation
◆ Satellite system is stable since launch.
Satellite System Normal
TTC-RF, MDHS-RF Normal
MDHS-DH Tentative stop of MDR operation No MDR recording for 10hours
on May 21, 2018 Radiation effect is suspected
TTC-DH Normal
AOCS, RCS Normal
EPS, PDL Normal
TCS Normal
SGLI VNR Tentative stop of PL Tilt operation No tilting for 10-14 hours
6 times over SAA region. Radiation effect is suspected
SGLI IRS Normal Regular TIR health check
with 3 months interval
Satellite & ground system information such as products, status and obs. plan is available
at “SHIKISAI Portal”. https://shikisai.jaxa.jp/index_en.html
4
VN & SW Cal. Coefficients is
SGLI Calibration reflected to products
since Ver.2 data processing
• LED(Halogen), Solar & Lunar Cals are consistent for VNR & SWI.
TIR is calibrated using black body & deep space in real time, degradation is very small.
TI01 Gain [%] TI02 Gain [%]
(Normalized at Jan. 30, 2018) (Normalized at Jan. 30, 2018)
0.0 0.0
-0.5 -0.5
-1.0 -1.0
2018/1 2019/1 2020/1 2018/1 2019/1 2020/1
5
GCOM-C satellite orbit
Orbital debris avoidance maneuver on March 15 & May 05, 2019.
Acceleration maneuver is planned in early Feb. 2021.
Inclination maneuver for Local Sun Time is planned in June 2021.
EAST →
40
Ground Track [km]
20 Debris Avoidance
△
Manouver
Accel. Manouver
0
-20
△ NOW
NOON → ←WEST
-40
2018/01/01 2018/07/20 2019/02/05 2019/08/24 2020/03/11 2020/09/27 2021/04/15 2021/11/01
10:30:00
▽ NOW
Local Sun Time
10:25:00
10:20:00
10:15:00 △
← NIGHT
Inclin. Manouver
10:10:00
2018/01/01 2018/07/20 2019/02/05 2019/08/24 2020/03/11 2020/09/27 2021/04/15 2021/11/01
6
Optical thickness of fine-mode aerosols by SGLI polarimetry
✓ Aerosol anomalies are clearly captured by the three-year observation of SGLI polarimetry in Australia, Siberia,
California, and Amazon areas
✓ SGLI will contribute to understanding of the climate system including the aerosol-cloud-radiation processes
SGLI fine-mode aerosol anomaly (difference from 2018-2020 average)
AOT anomaly averaged in the rectangular area
Australia
AOT@500nm 2019/12
Siberia
California
Amazon
AOT@500nm 2020/09
SGLI polarimetry is sensitive to the fine mode aerosols
including fire-smoke and urban aerosols. 2018 2019 2020 7
Year-to-year change of NDVI Target area
52N, 124E
2018 2019 2020
Jan
July July July
Feb NDVI around 52N, 124E
Aug Aug Aug
2018,
Mar 2019,
2020 leafing
Sep Sep Sep
Increase of NDVI
Apr by snow melt
Oct Oct Oct
May 2018 2019 2020
melted
Nov Nov Nov
Jun
Dec Dec Dec Snow cover of 30 Mar - 7 Apr around 52N, 124E
In the northeast Asia, the spring leafing in 2019 was later than one in 2018 by about 1-2
weeks corresponding to the late melting of snow cover in the early spring
✓ SGLI will contribute to understanding of the earth system including the vegetation-carbon processes and
improvement of the related parameters in ecosystem models
8
Year-to-year change of coastal ocean color
(Total suspended matter concentration)
Typhoon
river outflow Frequent rainbands
Ocean color (Total suspended matter concentration,
TSM) in Tokyo bay seems influenced by the river
outflow increased by heavy rainfall in the drainage
basin, e.g., the end of Sep. 2018, Oct. 2019, and the
end of Jul. 2020
The river outflow data is obtained from JAXA's land surface & river simulation
system, "Today's Earth (TE)“: https://www.eorc.jaxa.jp/water/
✓ SGLI will contribute to understanding of the coastal land-ocean interaction and improvement of the related
parameters in coastal numerical models 9
GCOM Mission
✓ GCOM mission is in the execution phase.
GCOM Mission Climate Change
Sat Obs. Model
GCOM-W GCOM-C GCOM Obs. Model Pred.
Earth System Model
Radiation Temperature
• Cloud, Aerosol 大気
• Reflectance （LULC) 対流圏界面 Sea Level
• Snow & Ice
• Surface Temp
data Snow & Ice
雪氷 Env. Change
Carbon Cycle comp
• Vegetaion • Precipitation
• Land Cover • Extreme Weather
• Chllophyl-a 陸 海 • Land Use Change
• Coastal Change
Water Cycle Modeling
Global • Water Vaper, Cloud
• Precipitation Parameterization
Observation • Soil Moisture
• Snow and Ice Prediction
• Surface Temp. Winds
Data Env. Monitoring Earth System
Utilization Process Study Model
ECVs
10Data utilization on platform（tellus, GEE）
✓ Data delivery to tellus since 2019. Chrollophl a Sea Surface Temp
✓ Level-3 data delivery to Google Earth
Engine (GEE) since Nov. 2020.
✓ Data application activities are encouraged.
https://developers.google.com/earth-engine/datasets/tags/gcom-c
Leaf Area Index Land Surface Temp.
SGLI SST on
GEE Code Editor
11Schedule
Three years from first light
→ Such as seasonal change data analysis is encouraged
2017 2018 2019 2020 2021 2022 2023
Dec.23▲ ▲Jan.01 ▲ ▲ NOW ▲
Launch Fist Light Ver.1 Ver.2 ▽ Ver.3(TBD)
Routine Phase (5 years)
Dec.20 △ △ △
GCOM Sympo. PI W.S. 2020 PI W.S. 2021
Data Processing Ver.1 Ver.2 Ver.3
Data Re-Processing Ver.1 Ver.2 Ver.3
12Summary
GCOM-C satellite and SGLI are stable.
GCOM-C data has been provided to the public
continuously since Dec. 20, 2018.
GCOM-C routine phase operations for 5 years
(Dec. 2017 – Dec. 2022)
GCOM mission is in the execution phase
Encouragement to the practical use for the social benefits.
Encouragement to the climate research for GCOM mission.
Thank you
Shikisai@ml.jaxa.jp
https://shikisai.jaxa.jp/index_en.html
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