GRWG Report and Briefing Dohyeong Kim GRWG Chair

Overview Membership and Chairing GRWG Activities Summary 2017/2018 GRWG Work Plan 2018/2019

GSICS Research Working Group GRWG Chairing Current nomination to GRWG (36 members): 5 CMA, 2 CNES, 4 EUMETSAT, 1 IMD, 1 ISRO, 3 JAXA, 3 JMA, 3 KMA, 4 NASA, 6 NOAA, 1 ROSHYDROMET, 2 USGS and 1 WMO GSICS Research Working Group Chair: Dohyeong Kim Vice-Chair: Tim Hewison Vice-Chair: Scott Hu UV Sub-Group Chair: Rose Munro VIS/NIR Sub-Group Chair: Dave Doelling IR Sub-Group Chair: Tim Hewison Microwave Sub-Group Chair: Ralph Ferraro

Overview Membership and Chairing GRWG Activities Summary 2017/2018 Actions and web meeting Summary of activities GRWG Work Plan 2018/2019

2017 GRWG/GDWG Annual Meeting Monday: Mini Conference + Agency Reports(Plenary) Tuesday: Sub-Group Briefing Report Wednesday: GRWG : UV Sub-Group + IR Sub-Group, MW Sub-Group, GDWG Thursday: GRWG : VIS/NIR Sub-Group, GDWG Friday: Briefing+Wrap-up(Plenary)

Annual meeting summary 10 Sessions and 121 Items were discussed 2017/2018 Actions 66 Actions generated IR subgroup : 5 actions VISNIR subgroup : 5 actions MW subgroup : 8 actions UV subgroup : 1 action

Actions on GRWG during 2017/18 Action Id Summary Lead Due Date Status A.GWG.2017.1e.1 GRWG to coordinate with B. Wielicki + Exec panel the writing of a white paper to support the CLARREO project GRWG Chair 2018-03-21 closed (CGMS-45) A.GWG.2017.1j.1 Andy to discuss with GCC how to promote the PATMOS-x products through the GPPA. NOAA(Andy) 2018-03-01 Open A.GWG.2017.2c.1 CNES to report on progress with analysis of IASI moon observations at LCW CNES(Bert) A.GCC.2017.2c.2 GCC to interact with EUMETSAT for IASI readers. A.GWG.2017.2i.1 EUMETSAT (P. Miu) to provide info to ISRO regarding the access to IASI data. EUM(Peter) A.GWG.2017.2i.2 EUMETSAT (P. Miu) to investigate hosting ISRO GSICS products on the EUMETSAT GSICS collaboration server. A.GWG.2017.2i.3 NASA to support IMD with MODIS data. - Existing action - no new one needed? 2018-03-27 A.GCC.2017.2j.1 GCC and KMA to check the status of KMA’s products in the GPPA. NOAA(Manik) and KMA(Hyesook) A.GWG.2017.2k.1 EUM to provide the degradation model for GOME-2 to NASA (Dave Doelling). EUM(Rose) A.GWG.2017.3a.1 CMA(Scott) to confirm whether CMA can register for the new messaging service from China. CMA(Scott) A.GCC.2017.3a.2 GCC to organise a web meeting before the User’s workshop. A.GCC.2017.3a.3 Each agency should indicate who should represent the users on their side. Manik to coordinate. NOAA(Manik)

Actions on GRWG during 2017/18 Action Id Summary Lead Due Date Status A.GWG.2017.3c.1 GRWG Chair to check with EP if the ToR could be changed to address GRWG_15.1. GRWG Chair 2018-03-01 On-going A.GWG.2017.3o.1 Rob (EUMETSAT) to report back at the next annual meeting on the investigation to do an homogenisation in the radiance space (instead of in the spectral space with the SRFs). EUM(Rob) Open A.GRWG.2017.4c.1 Rose to investigate what tasks and tools are needed to pursue the work presented by Larry in the broader context of the UV Subgroup and in particular to identify resources needed with the aim of bringing this to the attention of the EP. EUM(Rose) A.GMW.2017.5g.1 MW subgroup would contact NOAA GDWG to get support for product creation if needed. Ralph Ferraro A.GMW.2017.6b.1 Provide an update on the status after launch (currently Sept 2017) Ed Kim 2017-12-01 A.GMW.2017.6c.1 Determine feasibility of extracting the inter-calibration algorithms and coefficients from the FCDR and making them a GSICS product. Karsten Fennig A.GMW.2017.6d.1 Cheng-Zhi Zou A.GMW.2017.6f.1 MW Subgroup chair to develop candidate satellite/sensor (inventory), perhaps in the form of a graphical aid, as in orbit references for specific channels (based on some predetermined set of parameters that Manik has outlined...) and note pros and cons, other attributes (publications, etc.)? It should include timelines of sensors and overlap periods. A.GMW.2017.6f.2 Tony Reale (NOAA) to provide a draft uncertainty analysis describing the comparison of example (microwave) instruments to GRUAN sondes. Tony Reale

Actions on GRWG during 2017/18 Action Id Summary Lead Due Date Status A.GMW.2017.6g.1 MW co-chair to develop set of specific tasks to be performed by the Subgroup to intercompare RTM output over static references and surface models. Tasks to be identified within 6 months (Sep. 2017). Ralph Ferraro 2018-08-01 Open A.GCC.2017.6b.1 GCC to update the action tracking page in response to GRWG/GDWG proposal. 2018-03-01 A.GCC.2017.6c.1 GCC to survey from the GSICS users (e.g. during the GSICS User’s Workshop), which netCDF models they are using; classic or enhanced. If enhanced, what features they are using in this model; chunking, …? A.GRWG.2017.7c.1 JMA to report at the next annual meeting on their investigations regarding the diurnal variation in AHI by using GEO-GEO approach. JMA(Hidehiko) A.GRWG.2017.7c.2 CMA is encouraged to investigate GEO-GEO comparison. In particular because FY-2 is spinning and therefore is not impacted by midnight anomaly. This exercise would help correcting for the SL issues. CMA(Xu Na) A.GRWG.2017.c.3 JMA to report at the next annual meeting on their uncertainty analysis in the gap filling method with AHI/AIRS. JMA(Masaya) A.GRWG.7cb.1 Aisheng (NASA) to get in touch with Chris Moeller to investigate the possibility to have a SRF shift and report back at the later stage (for both VIIRS and MODIS). NASA(Aisheng) A.GRWG.2017.7d.1 Larry to check the status of the GOES sounder product (demo?) NOAA(Larry) A.GIR.2017.7d.1 Tony Reale (NOAA) to provide a draft uncertainty analysis describing the comparison of example (IR) instruments to GRUAN sondes by the next annual meeting. NOAA(Tony)

Actions on GRWG during 2017/18 Action Id Summary Lead Due Date Status A.GIR.2017.7d.2 Steve Broberg (JPL) to provide the theoretical uncertainties on the temperatures reported in slide 10 be split according to the scene temperature and the channels and consider updating the analysis accordingly. JPL(Steve) 2018-03-01 Open A.GIR.2017.7f.1 CMA to review the input needed for the error budget and request those information to the vendor. CMA A.GIR.2017.7f.2 Fred Wu (NOAA) to explore the feasibility of retrieving SRFs using the method initiated by Manik Bali and report back. NOAA(Fred Wu) A.GVNIR.2017.8f.1 Seb to contact ICWG via Andy to evaluate re-calibrated MSG reflectance data. EUM(Seb) A.GVNIR.2017.8h.1 NOAA(Fred Wu) to solicit lunar images from the lunar calibration community to test evaluation of MTF. NOAA(Fred) A.GVNIR.2017.8h.2 Tom will inform Arata of some publication. USGS(Tom) A.GVNIR.2017.8ha.1 EUM(Seb) to arrange web meeting in April to finalise date and venue for lunar calibration workshop. A.GVNIR.2017.8u.1 NASA(Raj) to provide SBAF for each GEO imager based on VIIRS v2. Target date 30 May 2017. 2 Web meetings Implementation of DCC mode method and writing journal paper by early 2018. NASA(Raj) A.GCC.2017.9f.1 GCC to coordinate provision of GSICS Corrected test data from the 0.6µm and 11µm channels of all available GEO imagers during Dec 2009 to Ken Knapp to assess the impact of the corrections on ISCCP products. A.GCC.2017.9g.1 GCC to get the names of POC of agencies for pre-launch characterization workshop. In touch with CEOS. A.GCC.2017.9i.1 GCC to follow up with Andy Heidinger and Tim Hewison on to send a GSICS Rep to ITOVS and Users NWP Meetings, Cloud Working Group CGMS working groups. A.GCC.2017.9k.1 GCC to coordinate a preparatory web meeting on clarreo and send out invitations to members to attend the webmeeting.

Actions/Recommendations from CGMS Description Deadline/Actionee Status A45.05 GSICS to produce annual state of the observing system report to be delivered at CGMS CGMS-46 OPEN Report to CGMS-46 and GSICS-EP-19 R45.05 Calibration events logging task team be folded under GSICS as a task team GSICS Report as part of GSICS report R45.06 Under the task team, agencies should assess the compliance of each agency with the new guidelines on events logging, and establish a list of instruments to be addressed by the calibration logging system R44.26 Satellite operating agencies should support proposals and programs to acquire high-accuracy characterization measurements of the Moon, to develop a new, high accuracy, SI-traceable lunar reference standard for reflected solar wavelengths CGMS space agencies SWTT preparing a proposal on integrating some space weather products into GSICS (WGII/XX) Proposed Working Paper in CGMS-46 : “Hyperspectral intercalibration and reprocessing” (SG session)

Actions from GSICS-EP-18 Action Id Summary Remarks EP-18.01 to prepare specifications and methodologies for CGMS agency development of operational instrument performance monitoring systems GRWG EP-18.02 to assess the utilization RO for microwave instrument monitoring purposes EP-18.03 to develop an approach for an Annual GSICS report on the State of the Observing System with Respect to Instrument Performance and Intercomparisons with GSICS Reference Instruments (from presentations given at the GRWG meeting) GRWG+ GDWG EP-18.04 to assess the value of GEO-to-GEO intercalibration for GSICS EP-18.05 to develop GSICS Service Specification Document +GCC

GSICS Web Meetings 2017/18 (12 times) 2018-01-30 GRWG/GDWG Planning 2018 Annual Meeting(2nd meeting) 2018-01-12 GRWG MW Subgroup Microwave Subgroup web meeting 2017-12-14 GRWG IR Subgroup Migration of IR Reference from IASI-A to -B + Alternative Regression (Tim Trent) 2017-11-21 Planning 2018 Annual Meeting + SI-traceable Reference Workshop 2017-11-13/16 Joint GSICS/IVOS Second Joint GSICS-IVOS Lunar Calibration Workshop - Xi'an, China 2017-11-08 GDWG Progress meeting on GDWG activities 2017-10-12 Microwave sub-Group web meeting 2017-07-25 Discussion on GSICS MW Products 2017-07-11 Exec Panel de-briefing 2017-06-27 IR Reference Traceability Report - Review progress - including draft error budgets 2017-06-22 Microwave Sub-Group Web Meeting 2017-04-26 Joint GSICS/IVOS - S. Wagner Organisation of the Second Lunar Calibration Workshop - China 2017

Supporting CLARREO project Action: A.GWG.2017.1e.1: GRWG to coordinate with B. Wielicki + Exec panel the writing of a white paper to support the CLARREO project “The Need for On-Orbit SI-traceable Hyperspectral Reference Instruments for Satellite Inter-Calibration(GSICS)” presented to GSICS-EP-18-Doc-7.1 CGMS-45 WG II/6 Selected topics of high priority to members Update on CLARREO project provided by Tom Stone (10f)

Need for RAC and demo product for VIS/NIR The use of FCDRs as inter-calibration references Currently being pursued by SCOPE-CM, based on the time series from multiple HIRS instruments Will be tied to IASI as an anchor reference(following the FIDUCEO project) Agreed that RACs can support the generation of FCDRs Decision : GSICS member agencies generating RACs are required to regenerate them for the entire record of each monitored instrument in event of a major version change in the processing algorithm The topic of generating prototype/demonstration products for the VIS/NIR channels of GEO imagers An important step to obtain feedback to guide further development The current strategy for VIS/NIR products was on the right track EP was requested to provide more resources within the member agencies to support the generation and distribution of demonstration products

Aid to Users Selection of GSICS Products User need : Required accuracy or level of uncertainties, sensitivity of products to the calibration Some of this information in the User Guides, accessible from the GSICS product Catalog Need to standard the info provided to the users Suggestion for format of user guide : should include the information of sensor over whole operational time The simple document including the description of dataset Some information need to be detailed for climate application including near-real time use Advantageous to provide basic information of the typical calibration biases of each instrument, derived from the GSICS Corrections, together with their variability and a statistical summary of the quality of the GSICS Corrections

Collaboration with ISCCP GRWG WGII/4 A44.05 GRWG to discuss with ISCCP (SCOPE-CM Project 9) a detailed project proposal for the use of GSICS methodologies to produce a GSICS-compliant ISCCP dataset for evaluation CGMS-45 OPEN 5.1 (HLPP ref) Review the history of ISCCP activities(phase I : 1983-2009) and discuss collaboration between ISCCP and GSICS Phase II will cover extended period (1982-1983, 2010-2015) Cloud products uncertainties are limited by atmospheric correction rather than calibration ISCCP calibration three stages(Nominal, Normal, Absolute (temporally stable)) VIS is based on vicarious terrestrial targets while IR based on the CDFs ISCCP data cannot be used for temperature trends, but can trend some cloud products (e.g. cloudiness) ISCCP could evaluate the impact of GSICS Corrections for GEO imagers on ISCCP cloud products, based on case studies GPRC to provide tables that map IR (11µm) counts to radiance and/or TB GPRC to produce/provide a table mapping VIS (0.6µm) counts to radiance/scaled radiance if possible Updated tables for the month of Dec 2009 are the target (other months are also available)

Overview Membership and Chairing GRWG Activities Summary 2017/2018 GRWG Work Plan 2018/2019 Topics in the plenary

Challenges – Advanced next-gen GEO/LEO 9:25 Peng Zhang CMA Latest progress of CMA FY-3D and FY-4 satellite 1d 0:20 9:45 Lei Ding SITP Development of SI-traceable Hyperspectral FTIR instrument 1e 10:05 Qiang Guo FY-4A calibration and validation 1f 10:25 John Fullbright NOAA (Remote) GOES-16 calibration and validation 1g 10:45 Xiuqing Hu Post-launch test progress of FY-3D 1h 11:25 Cao Changyong /Lin lin NOAA/NOAA Affiliate NOAA-20 Imager/Sounder SDR Maturity and Collaboration with FY3D through GSICS 1i 11:45 Feng Jiang Solar band SI-traceable demonstration instrument 1j New next gen GEO FY-4A GOES-16 NEW LEO FY-3D NOAA-20 SI traceable Hyperspectral FTIR 12:40 Qiang Guo, Xuan Feng CMA Advanced next-gen GEO imagers/sounders - FY-4A 3i 0:20 13:00 Fred Wu NOAA Advanced next-gen GEO imagers - GOES-16 3j 13:20 Likun Wang NOAA Affiliate NOAA-20 CrIS calibration status and preliminary differences between SNPP and NOAA-20 CrIS 3k 10:40 Xuan Feng　 CMA Early calibration results of FY-4A/GIIRS during in-orbit testing 4g 0:20 11:00 Hanlie Xu GIIRS and HIRAS Hyperspectral instrument evaluation for FY-4A and FY-3D 4h 14:20 Hank Revercomb SSEC Calibration status of NOAA20 CrIS and intercalibration 4o 0:30

Challenges – GEO-ring GEO-GEO comparison GEO-ring database GEO-GEO benefit and RGB composites GEO-ring database FIDUCEO update address inter-calibration requirements and formats 14:10 Tim Hewison EUMETSAT GEO-GEO benefits and RGB Composites 3m 0:20 15:00 Rob Roebeling EUMETSAT (Remote) GEO-Ring database 3n 0:20 15:20 Viju John FIDUCEO update 3o 15:40 Frank Ruethrich Update on FIDUCEO to address inter-calibration requirements and formats 3p

Challenges - Expansion References GEO Sounders SI-traceable Hyperspectral CLARREO update Pre-launch instrument characteristics GCOS v2 with GSICS 11:45 Feng Jiang SITP Solar band SI-traceable demonstration instrument 1j 0:20 10:40 Xuan Feng　 CMA Early calibration results of FY-4A/GIIRS during in-orbit testing 4g 0:20 10:20 Tom Stone USGS CLARREO update 10f 0:20 10:00 Xiuqing Hu, Lei Ding CMA A potential workshop of best practices for pre-launch instrument characteristics 10e 0:20 09:30 Bruce Wielicki NASA Role of inter-calibration in the future climate monitoring system (GCOS v2) 10j 0:30

Actions from EP-18 on GRWG Action Id Summary Remarks EP-18.01 to prepare specifications and methodologies for CGMS agency development of operational instrument performance monitoring systems 10b EP-18.02 to assess the utilization RO for microwave instrument monitoring purposes 9i EP-18.03 to develop an approach for an Annual GSICS report on the State of the Observing System with Respect to Instrument Performance and Intercomparisons with GSICS Reference Instruments (from presentations given at the GRWG meeting) 10a EP-18.04 to assess the value of GEO-to-GEO intercalibration for GSICS 3m EP-18.05 to develop GSICS Service Specification Document

GRWG Chairing GRWG Chairing : three years (renewable) Nomination By the time of GSICS-EP-19(June 2018), current GRWG Chair and Vice-Chairs have completed their 3 years of leading and chairing (GSICS ToR ref: GSICS-RD004-v2.0) The GRWG chair is assisted by two vice-chairs, one being the former chair, and the other being the expected future chair. The GRWG chair is designated for three years (renewable) with a primary role as defined in its ToR. GRWG Chairing : three years (renewable) Chair : Dohyeong Kim (KMA), 2015. 6 (approved by EP-16) ~ 2018. 6 (EP-19) Vice-Chair : Tim Hewison (EUMETSAT), Scott Hu (CMA) Nomination NEW GRWG Chairing to be discussed on Friday (10l) GRWG members are kindly requested to considering themselves for the GRWG chairing nominations

Thank you