GSICS Microwave Sub-Group Web Meeting 2019-11-19

  1. 13:30 – 13:35. Introductions, Qifeng Lu, Mark Liu, Ralph Ferraro (NOAA/NESDIS)
  2. 13:35 – 13:50 Summary of ITSC/User Workshop -- Manik Bali
  3. 13:50 – 14:05 ATMS versus AMSU/MHS Simultaneous Nadir Overpass Ta Bias Time Series Results from 12 Data Analysis Methods -- Iacovazzi
  4. 14:05 – 14:20 Microwave Integrated Retrieval System (MiRS): Overview, Recent Activities, and Applications -- Grassotti
  5. 14:20 – 14:35 Planned Report on microwave imager inter-calibration and lessons learnt from GPM XCAL -- Wes Berg and Christophe Accadia
  6. 14:35 – 15:00 Review of action items & General discussions


Guest Chair: Qifeng Lu (CMA)

CMA: Qifeng Lu, Juyang Hu

EUMETSAT: Tim Hewison, Christophe Accadia, Viju John

JAXA: Misako Kachi KMA: Jun Park

NOAA: Chris Grassotti, Manik Bali, Cheng-Zhi Zou, Robbie Iacovazzi, Quanhua (Mark) Liu, Ralph Ferraro

NASA: Rachel Kroodsma

ECMWF: Bill Bell, Stephen English

UKMO: Fabien & Christoforos Tsamalis

DWD: Karsten Fennig

U. Hamburg: Martin Burgdorf

FLuctus: Bruno Picard

CSU: Wesley Berg

UMD: Isaac Moradi


13:30 – 13:35. Introductions, Qifeng Lu, Mark Liu, Ralph Ferraro (NOAA/NESDIS)

Qifeng Lu: Discussed his perceptions of the GSICS User Workshop
  • Observed good communication within the TOVS community
  • There is important work ongoing about data preprocessing in regards to SNPP/J01 satellite observations that may my leveraged for future cooperation. There was discussion about ATMS and reprocessing
  • Discussed Microwave Subgroup actions

13:35 – 13:50. Summary of ITSC/User Workshop -- Manik Bali

Notes from International TOVS Working Group Meeting Talks held November 1, 2019.

Presentations are online:
  • Lunar Emission Model – Study was performed by Tiger Yang regarding the inter-calibration between J1 and S-NPP ATMS using the moon. Important to this is the process to identify and interpret lunar views. What is the best practice for choosing lunar views for calibration?
  • Overview of activities in the subgroup – Bottom line is that group activities are expanding. Deliverables – GPM LUT.
  • In-orbit references for microwave instruments. There was a presentation from Cheng-Zhi Zou regarding using climate records as a reference.
  • GRUAN – The high-quality GRUAN radiosonde observations have been used as a reference for ATMS calibration monitoring. There was an action to check if L1C IASI has cloud information in it.
  • FIDUCEO Overview and Feedback – They have a MW Sounder FCDR to be used as a metrological framework. There is a need to organize a User Feedback session in the upcoming Annual Meeting.
  • Re-processing of SNPP/J01 satellite observations – Re-calibration methods by Cheng-Zhi generated interest in the International TOVS Study Conference (ITSC) and GSICS community.
QuestionsHow is ITSC being brought in? ITSC has an important plan for user for reprocessing satellite data. This effort represents a good link to interact with that community, in order to get lessons and insight into improving processing.

13:50 – 14:05. ATMS versus AMSU/MHS Simultaneous Nadir Overpass Ta Bias Time

Series Results from 12 Data Analysis Methods -- Robbie Iacovazzi

One question from Cheng-Zhi about large bias variability between S-NPP ATMS and Metop-B MHS.

14:05 – 14:20. Microwave Integrated Retrieval System (MiRS): Overview,

Recent Activities, and Applications -- Chris Grassotti
  • Comments and Questions
    • Why is there seasonal variance? It could be model dependent. O
    • Tim Hewison asked about exploring double difference to see difference between ATMS on J01 and S-NPP? This would be of great interest to GSICS to explore the use of this as an inter-calibration technique between very similar sensors in the same orbit. Chris was interested to pursue, but explained there are some limitations.
    • Christophe Accadia - Would you consider MWI, due to its relevance to L2 Ca/Val activities? Put it in closer in time. Interest in working with that data as well. This could work with MiRS Tropical Cyclone evolution. Absolutely. Use SSMIs and GMI – similar to MWI channel sets.
    • Manik – Has the Neural Network method analysis performed in Slide 18 still in research mode, or has it been transitioned to operations? Neural Network TB bias has been applied in MiRS, but not transitioned to operations. The method has not been tuned well. Tuning might make 6 parameters better, but at the same time one will get worse. So, there are trade offs. We need more work to figure this out. Want a more dynamic method than a static method. Have been seeing positive results, but not ready to make a commitment in operations.

14:20 – 14:35. GSICS inter-calibration products for microwave imagers based on the GPM

XCAL algorithms -- Wes Berg and Christophe Accadia
  • Wes proposed developing a report on the inter-calibration algorithms developed within GPM XCAL and lessons learnt. This offer was greatly appreciated by GSICS as a starting point of incorporating GPM XCal into GSICS.
  • Comments and Questions
    • EUMETSAT offered to host a workshop to discuss the application of the report on GPM XCAL inter-calibration to other microwave imagers. It could be implemented after the EUMETSAT Conference. So, any time after the 5th October 2020 may work. It could be a two day workshop. Use planned GPM XCal Report as a starting point.
    • Motivation for GPM Cross-Calibration Community to Participate in GSICS - Wes wants this experience to be disseminated to the community, so lessons not have to be relearned, and the institutional knowledge is not lost. For example, Tom Wilheit is great source of historical knowledge, but he will eventually retire completely. GSICS is an opportunity for documentation.
    • Tim Hewison sees potential for expansion of the methods, since the mature algorithms have been applied to improve precipitation applications. They may be likewise good for other applications – e.g. sea ice, but the techniques would have to be refined for other applications. In some cases new methods may have to be created. GSICS is a good forum for this.
    • How to move the idea of a workshop forward? Could put this on agenda for 22 November Annual Meeting Planning WebEx.
    • Cheng-Zhi – Has looked at FY-3 MW Imager. This could be used as a component of your GPM, TRMM and SSM/I microwave imager time series. AMSR-E and AMSR-2 have a gap with same orbit. FY-3 Microwave imager of same orbit and can fill gaps. Wes says this data is available from NASA. His group’s research is limited to NASA. NASA has political constraints that does not allow Chinese MWRI to be consolidated in the analysis. NASA GPM Program will not allow it.
    • GSICS Annual Meeting may be a good forum for these discussions. Can Wes give a talk at the Annual Meeting? Probably not in person, but he could participate by teleconference.

14:35 – 15:00. Review of action items and general discussions

Can send update of action items by e-mail. The meeting is running over 20 minutes late at this point.

Want to be able to gather in South Korea.


Concluding from the meeting:
  1. GSICS MWSG can closely cooperate with the ITSC community to benefit from each other on the user requirements, lessons and feedback.
  2. A report is planned on the inter-calibration algorithms developed within GPM XCAL and lessons learnt.
  3. This could be followed by a dedicated workshop to explore the implementation of the GPM XCAL algorithms to inter-calibrate other microwave imagers. This potentially could be implemented in Q4 after the 2020 EUMETSAT Conference.
Topic revision: r8 - 20 Nov 2019, ManikBali
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