GCOM-C Status
October 31, 2022
TANAKA, Kazuhiro
JAXA GCOM Project Team

2022年10月31日提出版

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GCOM-C Update◼ Successful launch on December 23, 2017
◼ SGLI First Light on January 1, 2018
◼ Data release on December 20, 2018. (Version 1)◼ Version 2 release on June 29, 2020.
◼ Version 3 release on November 29, 2021. Data reprocessing by Dec. 2022.

◼ End of routine operation phase on December 23, 2022. (plan)
Everything is nominal as planned.

→ The JAXA internal review board is planned in Jan. 2023
(TBD)

GCOM-C Launch
H-IIA rocket F-37
01:26:22 UTCOn Dec. 23, 2017
Japanese name“SHIKISAI”

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GCOM-C satellite and ground system status◆ Both satellite and ground system are stable since launch.
Satellite

Evets for 5 years

NormalTTC-RF, MDHS-RF

NormalMDHS-DH

NormalMDR tentative stop (May 21, 2018 & Nov. 27, 2021)
MDC 1 frame rejection （3 times since Jan. 6, 2019）
Radiation effect is suspected.

TTC-DH

NormalHKDR tentative stop (Jan. 13, 2020)
Radiation effect is suspected.

AOCS, RCS

Normal

STT-1 maintenance flag change (Aug. 4, 2020 & July 4, 2022)
Radiation effect is suspected.

EPS, PDL

NormalTCS

NormalSGLI VNR

NormalVNR tilt stop (6 times since March 2018)
Radiation effect is suspected.

SGLI IRS

NormalRegular TIR health check for noisy detector rejection with 3 months interval.

Ground system

NormalVer.3 data reprocessing※All information about GCOM-C is on “SHIKISAI portal” https://shikisai.jaxa.jp/index_en.html
3Satellite system (solar paddle array)
Sun Cal Maneuver Daytime power Day-Night average

GCOM-W

GCOM-C
Until May 2017（5years） Until Jan. 2022（4years）◆ Generation power is stable.

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SGLI onboard calibration◆Coefficients from Lunar-Sun-LED cal. are applied since VER.2 data processing (VN & SWI bands).

◆2 points calibration with black body for TIR bands.
1.00

VN01
VN02
VN03
VN04
VN05
VN06

0.98
0.96
0.94
0.92
0.90
0.88
0from SGLI/GIRO
time series comparison
D: days from 00:00 1st Jan. 2018

1.00
SW01

0.98
0.96

SW02

0.94

SW03

0.92

SW04

0.90
0.88

200 400 600 800 1000 1200 1400 1600 1800
Days since launch

01.00
VN07

0.98

VN08

0.96

VN09

0.94

VN100.92VN110.90
0.880200 400 600 800 1000 1200 1400 1600 1800
Days since launch

200 400 600 800 1000 1200 1400 1600 1800
Days since launch

PL01-02

1.02

Relative Ratio(Normalized by Feb. 1, 2018)

kvt(λ): calibration constant

1.02

VN07-VN11 Nadir telescope
Relative Ratio(Normalized by Feb. 1, 2018)

LL1B(λ) = Lorig(λ) / (1.0 + kvt(λ) * D)

SW01-04
Relative Ratio(Normalized by Feb. 1, 2018)

Relative Ratio(Normalized by Feb. 1, 2018)

VN01-VN06 Nadir telescope
1.02

1.02
1.00

0.98

PL01I

0.96
0.94PL02I

0.92

0.90
0.88
0200 400 600 800 1000 1200 1400 1600 1800
Days since launch

5Satellite Orbit（Routine Operation Phase ～ Post Routine Operation Phase）◆ Inclination maneuver in June-July 2021 period to maintain local sun time.
✓ Future inclination maneuver is planned with 3.5 years interval.

40+5years
Δλ [km]longitude error [km]20

inclination
manouvers

Orbital debris
avoidanceWest→✓ Fuels is enough for more than 15 years operation in Post Routine Operation Phase

manouver0-20←East-40

Local Sun Time (predict)Local Sun Time

10:25:00

manouverinclination
manouvers10:20:00

10:15:00
2018/01/01

2019/01/01

2020/01/01

2020/12/31

Routine Operation Phase (5years)

2021/12/31

2022/12/31

2023/12/31

2024/12/30←morning

Local Sun Time

10:30:00

noon→-60

Post Routine Operation Phase6

Ver.3 Data reprocessing
4 years data until Ver.3 release is under reprocessing.
⇒ ALL Ver.3 data will be ready by Dec. 2022.

※https://shikisai.jaxa.jp/repro_stat_en.html

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GCOM mission target

Considering
Solar Cycle✓ GCOM in long term observation mission aiming over 13 years.
GCOM Mission

Sat Obs.
GCOM-W

GCOM-C

ModelGCOM Obs.

Earth System ModelRadiation• Cloud, Aerosol• Reflectance （LULC)• Snow & Ice• Surface Temp

Carbon Cycle• Vegetation• Land Cover• Chllophyl-a• Coastal Change

GlobalObservation

DataUtilization

Water Cycle• Water Vaper, Cloud• Precipitation• Soil Moisture• Snow and Ice• Surface Temp. Winds

Climate Change
Model Pred.

雪氷

Temperature
Sea Level
Snow & Ice
Env. Change

陸 海• Precipitation• Extreme Weather• Land Use Change

大気
対流圏界面

datacompModeling
Parameterization
Prediction

Monitoring
Process Study

Numericalmodel8

5 years outcome from GCOM –C & Proposal for the future activities
1）Observation & Monitoring✓ More than 5 years data with quality assurance.
✓ Connectivity to the other mission data.
2）Process Study✓ EORC research activities using RAs and other activities for the process study.
3）Model contribution✓ Contribution to the Ocean, Aerosol and Earth System model activities.
4）Data utilization✓ Fishery, volcano, wild fire, ocean situation monitoring, agriculture, weather etc.

9Env. monitoring and process study➢ Accuracy of ALL products satisfy the standard(or target) accuracy requirements. Quality
controlled data monitoring is essential.
➢ EORC RA actives encourage the collaboration
with the other agencies research.
➢ Essential Climate Variables (ECVs) required
from GCOS & IPCC activities.
Ver.3
AGB

Mukai et al. (2020)

Niwano et al. (2018)10

Collaboration between model and sat. obs.
To the next phase, the integrated model research program (TOUGOU) and JAXA earth
observation research groups are planning to enhance collaboration to investigate the global
warming issues more effectively
SatelliteModel(including GCOM-C)(TOUGOU, ..)TOUGOU: Integrated research
program for advancing climatemodels
Theme A: Prediction and Projection ofLarge-Scale Climate Changes Based on
Advanced Model Development
Theme B: Sophisticated Earth systemmodel for evaluating emission reductions
needed Themes C and D: Integrated Climate Change
Projection and Integrated Hazard Prediction

Collaboration
 Obs. data analysis
 Model evaluation
 Parameter
constrain bysatellite obs.

JAXA: Satellite productdevelopment
Aerosol and cloud: use of SGLI NUV andpolarization channels
Land vegetation: temporal change(phenology), and above-ground biomass
Ocean phytoplankton: distribution, types,and primary productionSnow/ice: distribution and albedo

On-going collaborative researches:✓ Comparison of variables characterizing the aerosol-cloud system (EORA2 GCOM-C PI: Suzuki, Tokyo Univ)✓ Seasonal change (phenology) of land vegetation; and distribution of ocean phytoplankton (EORA2 GCOMC PI: Tachiiri, JAMSTEC)✓ Ice sheet observation and modeling (EORA2 GCOM-C PI: Aoki, NIPR, ArCS II)

To the next phase:• Increase collaboration research targets (e.g., carbon budget, climate sensitivity..)• Increase visibility of the collaboration

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Data Utilization（Fishery）
 Collaborations with fishery research agencies since 1990s.
✓ Dedicated web site, Hearing to users, Seminar andSymposium discussion leads to data utilization andfuture promotion activities and feedbacks to themself.
✓ Various utilization circumstance difference exist.
Off-Shore, Coastal, Aquaculture, Fish, Shellfish, Algae,Local economy, Local government policy✓ GCOM-C data are published from 14 local governments
and 5 agencies, now.
Sat. Obs.

Web Tools

Hearing・FAI monitor・Inner bay mon.

Communication
to various usersSeminor
Symposium

FuturePromotingactivities

Feed backhttps://shikisai.jaxa.jp/SuisanRiyou/index.html

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Data Utilization（Volcano, Wild-Fire, Ocean Situation Awareness）
 Satellite observation for volcano monitoring is important.
Remote volcano surveillance is essential because of thelimitation for accessing to such a far volcano from mainisland. GCOM-C is used for the discussing with such avolcano or wild-fire surveillance agencies.
 Huge pumice drift occurred in 2021 from FUKUTOKUOKA-NOBA.
 Several Ad-HOC inter-agency collaboration was
successful for such an accidental events.
JAMSTEC Drifting prediction

Japan Coastal Guard

FUKUTOKU-OKA-NOBA. ocean colorawareness (13 km) using GCOM-C Feb. 2,2021(6 months before eruption)
13Summary GCOM-C satellite and ground system are stable.
 GCOM-C 4 years data has been provided to the public continuously

since Dec. 20, 2018.
 GCOM-C routine operation phase is 5 years (Dec. 2017 – Dec. 2022)
 JAXA’s internal review board is planned to confirm the 5 years achievementand discuss the future activitie.
 Encouragement to the practical use for the social benefits.
 Encouragement to the env. monitoring, process study and model researchusing GCOM mission data.

Thank you
Shikisai@ml.jaxa.jp
https://shikisai.jaxa.jp/index_en.html
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