Report from CMA 16th GSICS Executive Panel, Boulder, May 2015

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1 Report from CMA 16th GSICS Executive Panel, Boulder, May 215 Peng Zhang CMA/NSMC

2 CMA Agency update in 214 Overall satellite planning FY-3C commissioning finished in March, 214 and operational running in June, 214. Its data quality and accuracy is largely better than FY-3A/3B. FY-2G was launched on December 31, 214. The commissioning on orbit almost finished. The straylight restriction is better than the previous and its IR calibration is also better and more stable. The second generation geostationary satellite FY-4A will be launched in the late 216. The forth satellite of FY-3 (FY-3D) is planned to launch at the end of 216 or the early 217. FY-3B orbit adjustment for preventing its orbit shift is done in May, 215. FY-3C/MWTS scanning problem appeared in Feb, 215 and is being fixed currently Other major events affecting the agency or its participation in GSICS Satellite Requirement and instrument specification of the third batch of FY-3 serial satellites including 4 satellites (EM, AM, PM and Rainfall ) is determined and Early morning satellite will be launched in 218 or later. GSICS-EP-16, Boulder, May 215

3 Participation in EP, GDWG, GRWG Points of contacts/meeting participants: EP: Peng Zhang GRWG: Xiuqing(Scott) Hu GDWG: Zhe Xu GPRC Points of contacts for operational matters: Na Xu Main contribution to GDWG actions CMA FY-2 GEO-LEO IR Products NRTC and RAC are available in CMA THREDDS CMA New Server in operation, hardware performance increased and CMA GSICS Server Installation and Configuration completed: IASI L1.nc and GOME-2 L1.hdf from EUMETSAT for FY-2 intercalibration are online at THREDD server Main contribution to GRWG actions LEO-LEO IR Calibration monitoring for FY-3C/MERSI/VIRR/IRAS were incorporated into CMA GSICS system. FY-2 GEO-LEO and FY-3C LEO-LEO demo product ATBDs are done for review FY-3C/MERSI and FY-2 Lunar calibration initiation and lunar ground-based measurement are planned to be conducted in 215. DCC operational algorithm began to be developed for FY-3/MERSI and FY-2 VIS/NIR. DCC monitoring found out a large inconsistency in visible reflectance between FY-2D, FY-2E, FY- 2F FY-3C/MERSI Non-linear correction using GSICS is being developed and combined method will be used to its operational calibration Comments, feedback Great appreciation to EUMETSAT for their providing IASI and GOME-2 for CMA GSICS product generation, which reduced time delay and operational instability. Encourage the owners of other reference instruments to consider this kind of provision to other GPRCs and deepen the collaboration within GSICS community. GSICS-EP-16, Boulder, May 215 New members in CMA GPRC

4 Current and prospective GSICS Products Product Status Comments GEO-LEO FY-2D/2E/2F IASI IR Demo NRTC,RAC, ATBD is ready LEO-LEO FY-3C/MERSI /VIRR/IRAS-IASI Demo NRTC, ATBD is ready LEO-LEO FY-3C/MWHS /MWRI-NPP/ATMS Planned Is being developed and done in 215 FY-2 VIS and FY-3/MERSI DCC Planned Finish in 215 Would GSICS community determine a microwave radiometer (Such as ATMS or Metop/AMSU) as the reference sensor and others compare with it? Which of the microwave imagers is the reference sensor, and how to generate GSICS products for the microwave imagers? Can we define the O-B as the primary product of microwave instruments and which radiative transfer model as the primary model (CRTM or RTTOVS)? GSICS-EP-16, Boulder, May 215

5 FY-2 GEO-LEO IR calibration GSICS monitoring Latest Results GSICS CIBLE GSICS K for IR1 and K for IR3 CIBLE FY-2G commissioning evaluation

6 FY-3C LEO-LEO IR calibration GSICS monitoring FY-3C/IRAS B19 GSICS with IASI MERSI b5-cris MWHS-ATMS Ave-diff FY-3C/VIRR IR GSICS Red: FY3C/VIRR-CrIS Blue:FY3C/VIRR-IASI -2 Nov.1 Nov.21 Dec.11 Dec.31 Jan.2 Feb.9 Mar.1 Mar.21 Apr.1 Apr.3 May.2 Jun.9 Jun.29 Jul.19 Aug.8 Aug.28 Sep.17 Oct.7 Oct.27 Nov.16 Date Update database using GSICS evaluation

7 DCC monitoring for FY-2D/2E/2F Relative Spectral Response FY-2D~2F Relative Spectral Response Function FY-2D FY-2E FY-2F Wavelength(nm) 1.There is evident inconsistency between FY-2D/2E/2F and large bias with respect to MODIS. 2.There is long term degradation of FY-2 visible band. Latitude FY2D-Operatioal Ref Latitude FY2D-Corrected Ref Latitude MODIS Ref Before and after DCC correction FY2D-OPT-REF 业务定标 -FY2D 与 MODIS 比较 Y= X R= Before MODIS-REF FY2D-COR-REF 校正后 -FY2D 与 MODIS 比较 Y= X R= After MODIS-REF

8 FY-2E Lunar calibration Phase Angle=4.5 Num of Lunar Pixels=26295 Abnormal Extremly low Phase Angle=42. Num of Lunar Pixels=3918 1*(Cf-Cf)/Cf [%] 1*(Cf-Cf)/Cf [%] The Variation of the Calibration coefficient at ROLO scale Straylight Annual Drift(Lunar): 1.86±.79% with 95% confidence STD(Lunar): Jan.1 Jul.1 Jan.11 Jul.11 Jan.12 Jul.12 Jan.13 Jul.13 Jan.14 Jul.14 Jan.15 Date The Variation of the Calibration coefficient of DCC for FY2E/VIS Annual Drift(DCC): 1.67±.9% with 95% confidence STD(DCC): Jan.1 Jul.1 Jan.11 Jul.11 Jan.12 Jul.12 Jan.13 Jul.13 Jan.14 Jul.14 Jan.15 Date Linear fitting regression(f) is used here to get the instrument degradation: f ( end) f (1) Rate is the annual degradation rate. STD means the standard Rate 365 days diviation of each spot minus f 1/ 2 i 1 STD n 1 n i 1 (( A f ) A f i i 2 )

9 CMA Lunar calibration project was funded CMA Team acquired a project funding from Chinese MOST (Ministry of Science and Technlogy) "Solar bands calibration technique based on Lunar radiance source (215~217). The main research points of this project include: moon prediction and geolocation, lunar radiance/irradiance model development, ground-based measurement and model validation and calibration algorithm development for satellite sensor. Collaboration partners: National Astronomical Observatories, Chinese Academy of Sciences (CAS) Changchun Institute of Optics, Fine Mechanics and Physics (CIOMP), CAS Nanjing University Jilin University

10 CMA Lunar calibration project was funded Prediction model for lunar position and geolocation of Lunar imager. Lunar Calibration algorithm development used for FY-3 An albedo model of Uniform Target on lunar surface Lunar Calibration algorithm development used for FY-2/4 A model of Full-disk Lunar Radiance Model Monitoring Degradation of sensors by lunar observation Validation of Lunar model by ground-based measure Inter-calibration based on lunar observation

11 Planned Lunar Ground-based measurement in 215 Moon imager from spectrometer Image size Spatial resolution Spectral range Spectral resolution 16*16pixels 38km 4-1 nm 2~1 nm SNR 6 Tracking Camera 5*5 VIS Lunar radiance and irradiance measurement from these two kinds of instruments are used for current lunar model (ROLO/GIRO) validation and new model establishment. Field Campaign will be conducted in June, 215 Moon Spectrometer Imaging Image size Spectral range Spectral resolution No imaging 4-25 nm 2~8 nm SNR 5 Tracking Camera?? Raw data of Moon-photometer Hyperspectral Moon-photometer

12 Non-linear correction Using GSICS FY-3C/MERSI Integrated/Synergic Calibration Combined Method Temporal variation of daily intercalibration slope Red line: New calibration Blue line: Prelaunch SRBC Yellow *: SNO sample based on GOME-2 Purple *: Statistical measurements over Deep Convective Clouds (DCC) (Chen et al., Remote Sens. 213) The new calibrations : consistent with SNO samples based on MODIS and GOME-2. lower over high reflectance comparing with linear results, and nearly go through DCC samples, and the reflectance difference less than 1%. Segmentation fitting is preferable for getting more appropriate calibration over the whole dynamic.

13 FY-3C/MERSI VIS inter-cal with GOME-2 and the improvement of Combined method Non-linear fitting using combined method:has largely improvement

14 User Requirements and Feedback about GSICS deliverables Satellite data users (internal or external) Application: GSICS GEO-LEO and LEO-LEO bias monitoring tools are primary way to evaluate the calibration accuracy of FY-2/FY-3 instruments in the commissioning phase and operational runnning phase. Application: Evaluation of operational calibration and improvement of onboard calibration system ( such as FY-3C/VIRR IR calibration). The nonlinear calibation on orbit was resolved using the GSICS combined method GSICS results can also help the improvement of L2 products accuracy such as AMW, SST, AOT As a satellite operator Needs for tools, services, datasets Suggestion for L1 Data sharing of reference sensors used for GSICS products generation (SNOs, DCC and PICSs dataset) CMA can provide these kinds of subsets of MERSI to other GPRC GSICS-EP-16, Boulder, May 215

15 Special thanks to EUMESAT Great appreciation to EUMETSAT for excellent exchange chance to CMA GPRC visiting scientist Lin Chen and technician Zhe Xu. Their visit deepens the collaboration between CMA and EUMETSAT GPRC in GSICS science research and data sharing. Suggestion to more of these kinds of person exchanges between other GPRCs GSICS-EP-16, Boulder, May 215

16 CMA remote presentation in Delhi Annual meeting Presenter Title Xiuqing Hu CMA SI-traceable demo instrument for FY-3 1d Yong Zhang CMA Reference site Ground-based Automatic Measurement system for CAL/VAL 1n Xiuqing Hu CMA CMA Agency Report 2f Lin Chen CMA DCC inter-calibration for FY2 and FY3Â visible 3f Lin Chen CMA DCC Seasonal variations & BRDF 3h Lin Chen/ Ronghua Wu CMA Application of GIRO to FY-2 & FY-3/MERSI 3l Xu Na CMA FY2-IASI towards Demo 5e Xiuqing Hu CMA Requirements for sharing L1 data 7d Zhe Xu CMA Products' Content Access Study 4j Zhe Xu CMA CMA GPRC GDWG report GSICS-EP-16, Boulder, May 215

17 Suggestion of GSICS L1 sharing between GPRC servers Reduce the time delay of GSICS operational processing based on L1 public website order procedure (2~3 days 1day) between different agencies and also reduce data volume transfer(by crop) Keep operation stability of GEO-LEO and LEO-LEO GSICS processing in all GPRCs, especially NRTC products. Three THREDDS severs in CMA, EUMETSAT and NOAA were set up and provide the opportunity to share more data for GSICS operation, especially these data of their own reference instruments and target sensors for other GPRCs. Push GEO-GEO comparison such as FY-2-MTSAT/Himawari, FY-2-MSG, MSG-GOES for long term VIS/NIR Inter-calibration and reference transfer based on global PICS sites (desert, snow and barren ocean) Support other GSICS researches such as SBAF, site BRDF model