10.3 JAXA: GCOM-C/SGLI new developments

Transcription

1 10.3 JAXA: GCOM-C/SGLI new developments Hiroshi Murakami JAXA/EORC IOCCG-21 Committee Meeting Santa Monica College, CA, USA 1-3 March 2016

2 JAXA Earth Observation Satellite missions Targets (JFY; Apr-Mar) Disasters & Resources Climate Change & Water Cycle Water Cycle TRMM / PR 2013~ [Land and disaster monitoring] [Precipitation 3D structure] GPM / DPR [Wind, SST, water vapor, precipitation] GCOM-W / AMSR2 ALOS-2 / PALSAR-2 ALOS-Next Optical Feasibility study Climate change Greenhouse gases [CO 2, Methane] GOSAT / FTS, CAI 2009~ [Vegetation, aerosol, cloud, SST, ocean color] GCOM-C / SGLI [Cloud and aerosol 3D structure] EarthCARE / CPR [CO 2, Methane, CO] GOSAT-2 Mission status On orbit Development Study Pre-phase-A Launch GCOM-C 5 years GCOM-C2 ~13 years GCOM-C3 2

3 GCOM-C satellite Earth view window FOV: 80-deg Deep space window 1. GCOM-C/SGLI development InfraRed Scanner (SGLI-IRS) Earth direction Visible and Nearinfrared Radiometer (SGLI-VNR) Solar calibration window Earth Earth Internal lamp (PD) Solar diffuser Scan mortar Black body Optical bench VNR-NP Non-polarization tree telescopes Each has the same 11 channels VNR-POL Polarization two (670nm and 865nm) telescopes Each has tree polarization-angle filters Earth SWIR detector mechanical cooler Total FOV: 70deg = 24deg 3 telescopes (~1150km@nadir) FOV: 55deg (~1150km@ 45deg along-track slant) 45deg 45deg alongtrack slant observation GCOM-C SGLI characteristics Orbit Sun-synchronous (descending local time: 10:30), Altitude: 798km, Inclination: 98.6deg Launch Date JFY 2016 Mission Life 5 years (3 satellites; total 13 years) Scan Push-broom electric scan (VNR: VN & P) Wisk-broom mechanical scan (IRS: SW & T) Scan width 1150km cross track (VNR: VN & P) 1400km cross track (IRS: SW & T) Spatial resolution 250m, 500m, 1km Polarization 3 polarization angles for POL TIR detectors Along track tilt Nadir for VN, SW and TIR, & +/-45 deg for P SGLI/VNR daily coverage 3

4 Multi-angle obs. for 674nm and 869nm SGLI Spectral bands Characteristics of SGLI spectral bands L std L max SNR@L std IFOV CH W/m nm /sr/ m - K: Kelvin K: NE T m VN /1000 VN /1000 VN /1000 VN /1000 VN /1000 VN /1000 VN /1000 VN /1000 VN * 250 /1000* VN /1000 VN /1000 POL POL SW SW SW /1000 SW TIR K 340K 0.2K 250/500/1000 TIR K 340K 0.2K 250/500/1000 VNR-NP SGLI-IRS VNR-POL Uchikawa, T., K. Tanaka, Y. Okamura, S. Tsuida, and T. Amano, "Proto Flight Model (PFM) performance and development status of Cisible and Near Infrared Radiometer (VNR) on the Second-generation Global Imager (SGLI)", SPIE Asia-Pacific Remote sensing, Beijing, China, , Tanaka, K., Y. Okamura, T. Amano, T. Hosokawa, and T. Uchikita, "The development status of Second Generation Global Imager Infrared Scanning Radiometer (SGLI-IRS)", SPIE Asia-Pacific Remote sensing, Beijing, China, , October,

5 1. GCOM-C/SGLI development Proto-flight tests of GCOM-C satellite-system (SGLI Scanning Radiometer Units, SRUs (VNR-NP, VNR-POL, and IRS), and Electrical Units, ELUs, are on-going in JAXA Tsukuba Space Center The radiometric tests are carried out using integrating spheres to characterize the SGLI radiometric performances The integrating spheres are precisely calibrated by the fixed point blackbody to ensure the traceability to the standard light source. SNR, dynamic range, linearity, gain stability, etc. are evaluated Preliminary results of SNR meet the specification with some margin (ref. next page) 5

6 1. GCOM-C/SGLI development Results high SNR is better high SNR is better specification low NEdT is better Yoshihiko Okamura ; Kazuhiro Tanaka ; Takahiro Amano ; Koichi Shiratama and Tamiki Hosokawa, " Development and pre-launch test status of Second Generation Global Imager (SGLI) ", Proc. SPIE 9639, Sensors, Systems, and Next- Generation Satellites XIX, 96390I (October 12, 2015); doi: /

7 2. Product development interaction JFY April-March GCOM-C Milestone Development phase PI research GCOM-C1 SGLI Project start Initial development Performance development Launch version development Improvement and application Announcement C1 RA#1 Review SGLI engineering model SGLI pre-flight model Ground system System definition Design Development GCOM-RA4 (C1 RA#2) algorithm selection Test GCOM-C launch Review C1 RA#3 PI alg submission v0.1 alg v0.2 alg v1 Initial cal/val Data release Review C1 RA#4 GCOM-C1 Project end GCOM-C2 launch Review EORC research & development Implement to the operation system Research & trial by other satellite data and simulation Submission to the ground system L1B draft data PLI-1 PLI-2 Initial Interaction (flow, volume) define I/F Ver. 0.0 interaction Pre-launch Development Completion Confirmation cal/val Ver. 0.0 Ver. 0.1 Ver. 1 Ver. 2 integration test of the ground system preparation Validation & Improvement Research product development Ver. 3 Launch GCOM-C 5 years GCOM-C2 ~13 years GCOM-C3 7

8 GCOM-C Ocean product operation flow and PI (JFY2016-) Level-1B L1B1 VNI Daytime Atmospheric corr. module Atmos. aerosol 1km/250m Normalized water leaving radiance L1B1 SWI L1B1 TI L1B1 POL PAR 1km/500m/250m Incl. cloud detection Toratani (Tokai U.) Frouin (SIO, US) JAXA Calibration by JAXA 1km SST module Incl. cloud detection Day&Night time Sea surface temp. JAXA Applications and international collaboration CEOS/OCR-VC, IOCCG, KJWOC/AWOC NASA, NOAA, CNES, GISTDA. Australia.. Domestic: FRA, JCG, JMA.. B. Franz (NASA): multi sensor McKinna(NASA): IOP M. Wang (NOAA): Atm.corr, VIIRS Ocean color module Chlorophyll-a conc. Total Suspended Matter Toratani (Tokai U.) CDOM absorption Kobayashi (Yamanashi U.) In-situ instrument JAXA Hirata (Hokkaido U) Suzuki (Hokkaido U.): HPLC Isada (Hokkaido U): Val at Akkeshi-Bay Kuwahara (Soka U): Val at Sagami Bay IOP Hirata (Hokkaido U) Research parameters Ishizaka (Nagoya U.) EZD IOP shape a ph PFT Redtide Hirawake (Hokkaido U) Hirata (Hokkaido U) Hirata (Hokkaido U) Kahru (SIO): Regional alg &Val Antoine (Curtin U.): Cal/Val Net Primary Productivity Ishizaka (Nagoya U.) Hirawake (Hokkaido U) Goes(Columbia Univ): Nitrate, NPP Matsuoka(U Laval): Arctic DOC&POC Blue: standard products, red: research products and double-line boxes are subject for level-3 production 8

9 3. Synergy with Himawari-8/AHI Himawari-8 data release: July JAXA-CSIRO meeting: Aug , 2015 JAXA Himawari-monitor ( Public open since Aug SST, Aerosol, PAR, OC.. are derived by GCOM-C algorithms (2016-) cloud properties, hotspot.. Cross-calibration and cross-validation with GCOM-C Aerosol optical thickness SST PAR NDVI & Chl-a 8-day average 8-day average 8-day average 8-day average 9

10 AHI hourly Chla on July H, 01H, 02H, 03H, 04H, 05H, daily, 00H,.., daily, 8-day 10

11 AHI Chla: comparison with MODIS Chla (L3) 1-day 1-day 1-day 8-day Good agreement in the summer time (upper figures) SNR becomes lower in the winter time due to large solar zenith angle 11

12 4. Summary The mission targets of GCOM-C are contribution to the climate system researches, the carbon cycle and the radiative forcing, through series of satellites, GCOM-C, C2 and C3. It has 250-m resolution and along-track slant-view polarization observation to improve the land and coastal monitoring, and aerosol estimation. Stable calibration: on-board diffuser with monthly moon observation GCOM-C/SGLI will be launched in Japanese Fiscal Year SGLI pre-launch tests, development of algorithms and ground processing system, and post-launch cal/val planning are being conducted by JAXA and GCOM-C PI. The new research period is going to start in the April 2016 (JFY ) Follow-on missions GCOM-C2, 3..., don t have been approved yet: need long-term series missions We have to demonstrate the success of GCOM-C1 International collaboration, e.g., JPSS, Sentinel-3, PACE.. 12

13 Backup slides

14 SGLI calibration standard blackbody Ground characterization radiometer onboard blackbody SGLI TIR SST LST buoy SST in-situ radiometer NIST AIST fixed-point blackbody furnace radiometer radiometer 1% integration <2% sphere in-situ radiometers internal lamp diffuser BRDF SGLI VN/SWR Vicarious calibration Ocean Desert Snow Cross calibration Other satellite sensors solar irradiance Cloud 2% Moon Solar spectrum Onboard calibration GIRO (GSICS/ROLO) once/month at the same phase angle Post-launch Level-1 calibration will be based on the onboard calibration Vicarious calibration will be used for confirmation of the onboard calibration, more accurate calibration (adjustment) required for the L2 algorithms 14

15 GCOM-C data distribution 1. Svalbard downlink station Global observation data including all the 250-m & 1-km observation modes (Raw data ~6GB/path) 14 or 15 passes (~90GB)/day 2. Japanese near-real time station Near-real time distribution to specific users* A backup of the Svalbard station 3. Direct downlink capability at other local stations (3) and (4) are required to make agreement individually with JAXA. All standard products (L1, L2, L3) will be distributed by S-FTP (released to the public one year after the launch) Free for both science and commercial purposes (3) (1) (2) GCOM-C GCOM-C GCOM-C/SGLI data (4) *Near-real time users (can be increased) a) JAFIC Products: SST, Chl-a, Rrs (Mapped) Area: Coverage of Katsuura Station Latency: 3 hours after observation b) JMA (TBD) Product: L1B, aerosol, snow cover, SST, LST Area : global Latency: 70% by 3 hours and 95% by 12 hours after observation 15