Geostationary Environment Monitoring Spectrometer (GEMS) Jhoon Kim 1 , GEMS Science Team 3 , GEMS Program Office 2 1 Department of Atmospheric Sciences, Yonsei University 2 National Institute of Environmental Research, Ministry of Environmentm, Korea 3 EWU, GIST, GWNU, PNU, PkNU, SNU, YSU, 5 NIER, Korea 19 th OMI Science Team Meeting, KNMI, Aug. 31-Sep 2, 2015
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Geostationary Environment Monitoring Spectrometer (GEMS) Jhoon Kim 1, GEMS Science Team 3, GEMS Program Office 2 1 Department of Atmospheric Sciences,
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19th OMI Science Team Meeting, KNMI, Aug. 31-Sep 2, 2015
GEO-KOMPSAT 2
• Launch: 2018-2019
Specification2A 2B
Payload AMI GOCI-2 GEMS
Lifetime 10 years
Channels 16 13 1000
Wavelength range
0.4 - 13 mm
375 - 860nm
300-500 nm
Spatial resolution
0.5 / 1 km(Vis)
2 km (IR)
250 m@ eq1 km (FD)
7 x 8 km2 @ Seoul3.5x8 km2
(aerosol)
Temporal resolution
10 min (FD)
1 hour 1 hour
2A Sat. : AMI 2B Sat. : GEMS, GOCI-2
(Twin Satellite)
Science Questions & Objectives of GEMSScience Questions Objectives
1. What are the temporal and spatial varia-tions of concentrations and emissions of gases and aerosols that are important for
air quality?
1. To provide measurements of atmospheric chemistry, precursors of aerosols and ozone in particular, in high temporal and spatial resolution over Asia
2. How do regional and intercontinental transport affect local and regional air quality?
2. To monitor regional transport events: transboundary pollution and Asian dust
3. How does air pollution drive climate forcing and how does climate change affect air quality?
3. To quantify radiative forcing of aerosol and ozone and to monitor air quality for long term
4. How does meteorology affect the air quality ?
4. To improve our understanding on interactions between atmospheric chemistry and
meteorology
5. How can we quantify the outflow from Asia to cross Pacific ?
5. To better understand the globalization of tropospheric pollution
6. How can we improve the accuracy of air quality forecast using satellite measurements?
6. To improve air quality forecast by constraining emission rates and assimilating chemical
observation data
Objective: Measurements of O3 & aerosol with precursors
NOO3, RO2
NO2
HCHO
hn (l<345 nm)
t~an hourOxidation(OH, O3, NO3)
O3hn (<420 nm) O
AOD, type,Height
Aerosol
Status of GEMS• GEMS Development
– SDR in Oct., 2013, PDR in Mar., 2014, CDR in Feb., 2015– GEMS Telescope shall be assembled, aligned, and tested at KARI in 2015 (JDAK)– GEMS System integration and test shall be performed in 2016– TRR in 2016 Q2, PSR in 2017 Q1– Delivery to KARI from BATC spring of 2017 for S/C integration
• GEO-KOMPSAT-2 Program– SRR in Apr., 2012; SDR in Feb. 2014, PDR in Jul., 2014, – CDR planned in Sep. 2015 for GK-2A, and Jan. 2016 for GK-2B
• Launch– Launch : Mar., 2019 by Arianespace (2A launch : May, 2018)
• Prime Contractor– Ball Aerospace & Technologies Corp.( selected on May 13th, 2013)
* AMI contract with ITT; GOCI-2 contract with Astrium
• Changes in Environment
– Air quality forecast in operation since 2013 by NIER/ME GEMS to be an operational sat. (e.g. data assimilation of model with sat. data)
– ‘KORUS-AQ’ airborne campaign planned in 2016 (with GEOTASO)
GEMS Design• Step-and-stare UV-Visible imaging spectrometer scanning at least 8 x per day
in 30 minutes• Daily solar and dark calibration• Images coadded at each position + mirror move back < 30 minutes
– [2.4 s @ each position (= 33 coadding x 72 ms image) + 100 ms step & settle ] x ~700 position + 2.3 s scan mirror back to null position
• Scanning Schmidt telescope and Offner spectrometer• Diffusers for on-orbit solar calibration and onboard LED light source• 2-axis scan mechanism with gyro feed capability• Redundant electronics for 10-year lifetime
Constellation of GEO Mission for Synergistic ProductsConstellation of GEO Mission for Synergistic Products
TEMPO + GOES-R(America)
GMES S4 UVN+ FCI + IRS
MTG (Europe)
GEMS + AMI + GOCI2GEO KOMPSAT(Asia)
Constellation synergy- Improving spatial and temporal coverage to monitor globalized pollutants & SLCF- Sharing basic requirements on data products and instrument to maintain data quality- Consolidating socio-economic benefit analysis- Supporting QA and CAL/VAL
UV-Vis-NIR305-500, 750-775 nm
UV-Vis290-690 nm
UV-Vis 300-500 nm
TROPOMI, OMPS, APOLLO …
Himawari 8FY-2, 3,COMS INSAT …
Summary• CDR of GEMS has been completed successfully and GEMS is now in
manufacturing phase to be delivered to KARI by spring, 2017. The launch date for GEMS is now March, 2019.
• GEMS onboard the Geo-KOMPSAT-2B is expected to provide infor-mation on aerosol and O3 together with their precursors in high spa-tial and temporal resolution- O3 NO2 HCHO SO2 AOD/AI/AEH, (possibly CHOCHO, BrO)
- Clouds, surface reflectance, UV radiation.
• The predicted performance of trace gases from the initial design of GEMS satisfies the product accuracy requirements of NO2, HCHO, O3. Meanwhile, the performance is expected to be poor for SO2 in particular, in winter near Korea.
• Collaboration with Team of TROPOMI, Sentinel-4 & TEMPO is valu-able in calibration, algorithm development and application.
Acknowledgement
GEMS Science Team
Ministry of Environment (MoE)
NIER, MoE
KEITI, MoE
Korea Meteorological Administration (KMA)
Korea Ocean R&D Institute (KORDI)
Ministry of Science, ICT & future Planning (MSIP)
KARI
GEMS Science TeamMyung Hwan AhnYong Sang ChoiMyeongjae JeongJae Hwan KimYoung Joon KimHanlim Lee Kwang Mog LeeRokjin Park Seon Ki ParkChul Han SongJung Hun WooJung-Moon Yoo