Feedback from ISCCP on Use of GSICS products

Feedback from ISCCP on Use of GSICS products: GSICS Response Discussions in GSICS on Ken Knapp’s review of GSICS Products By Manik Bali and Larry Flynn Acknowledgement (Masaya Takahashi, JMA) Kenneth Knapp Review of use of GSICS Product ( Presentation 3 l GSICS Annual Meeting, slides used as reference)

outline ● Accessing GSICS information to compare with ISCCP ● GSICS products accessiblity ( Currenty status) ● Actions completed to address ISCCP requirements http: //gsics. atmos. umd. edu/pub/Development/Annual. Meeting 2019/3 l_ISCCP_Grid. S at%20 and%20 testing%20 GSICS%20 adjustments. pptx

Notes from accessing GSICS data files ● Files behind a TDS are difficult to perform bulk downloads ● It was not immediately clear what all the links were and which were useful and which were dead ends. ● ATBDs are prominent but are less useful to end users (initially). User guides are especially helpful but are more difficult to access. ● The adjustments provided do not also provide the calibration coefficients ○ Leaving the user wondering “Am I using the right calibration coefficients? ? ” ● The GSICS websites appear to be developed for GSICS contributors ○ not users.

● ● GSICS data by agency Easiest - MTS-2 ○ JMA provides calibration table Moderately easy - MSG-3 ○ Calibration coefficients with image data ○ one GSICS file with all adjustments Moderately difficult GOES 13/15 ○ Cal. coeff. online ○ 100 s of GSICS files Most difficult - MET-7 ○ Cal. coef. used not online ○ One source was not the right one ended up with files from Viju that aren’t public Variables GOES-13 GOES-15 Wavenumber x x Beta/B (rad/temp conv) beta Alpha/A (rad/temp conv) alpha a 1/a 2/a 3 (effective temp) x x Central wavelength x x x Channel name x x x date x x x Validity period x x x x x slope_Se x x x x x offset_se x x x covariance x x x filter_integral MET-7 MSG-3 MTS-2 x x b beta a alpha x x dn_offset (and _se) x dn_slope (and _se) x calibration_table x Calibration coefficients (original) x

access: recommendations ● Change from TDS to FTP or HTTPS - which allow easier bulk downloads. ● Make user guides more prominent ● NRTC/RAC/beta/pre operational ○ for each satellite, provide one set of links with Status: Satellite Status GOES-13 pre-operational Near real time data Meteosat-10 beta Near real time data … Reanalyzed data User guide ● Store calibration coefficients and calibration tables in the GSICS file ○ like what JMA is doing ● Consider making a table of the above for each satellite reference (IASI-A, MODIS, Aqua AIRS, etc. ) ● Consider including period of record in the tables

Discussion questions ● Using GSICS data - Are users the ultimate goal? ○ If so, many agencies should include other parameters (e. g. , match JMA parameters) ● GSICS adjustments - Initial tests do not show significant improvement for Grid. Sat ● ISCCP comparisons - Testing still underway. ○ Initial comparisons imply the inter-GEO diffs will be larger, esp. for MTS-2 and GOE-15 ● GEO harmonization ○ Another aspect of reprocessing and recalibration ● Visible data?

Status of actions Generated to address Ken’s feedback ● ● ● A. GCC. 2019. 9 p. 4 GCC is invited to contact Ken Knapp to what website he is referring to regarding his comment on its for contributors and not users, and report this to the working group. - Ken mentioned it is Product Catalog A. GCC. 2019. 9 p. 5 GCC to confirm with the GRWG to release the next version of the product catalogue address table concern from Ken- Quicklooks and Alert System introduced to provide daily status of products

GDWG Discussions on Ken’s feedback Feedbacks by Ken Knapp (NOAA) on Day-2 (3 l) ● Files behind a TDS are difficult to perform bulk downloads ● It was not immediately clear what all the links were and which were useful and which were dead ends. ü A. GDWG. 2019. 9 p. 1: EUM (Peter Miu) to create user guide for GSICS THREDDS. ü A. GDWG. 2019. 9 p. 2: NOAA to provide EUMETSAT the download script for review to see if this can be provided to users to improve the downloading of GSICS products. ● ATBDs are prominent but are less useful to end users (initially). User guides are especially helpful but are more difficult to access. ● The adjustments provided do not also provide the calibration coefficients ○ Leaving the user wondering “Am I using the right calibration coefficients? ? ” ü A. GRWG. 2019. 9 p. 3: GRWG to consider improving the GSICS inter-calibration coefficients because they are difficult for the user to apply these corrections. ISCCP-NG GSICS Webmeeting 8/12/2020 8

GDWG Discussions Feedbacks by Ken Knapp (NOAA) on Day-2 (3 l) ● The GSICS websites appear to be developed for GSICS contributors ○ not users. ü A. GCC. 2019. 9 p. 4: GCC to contact Ken Knapp to what website he refers regarding his comment on, and report this to the working group. ● NRTC/RAC, Demo/Pre. Op/Op ○ for each satellite, provide one set of links with Status: Satellite Status GOES-13 pre-operational Near real time data Meteosat-10 beta Near real time data Reanalyzed data User guide ● Consider making a table of the above for each reference (e. g. IASI-A) ● Consider including period of record in the tables ü A. GCC. 2019. 9 p. 5: GCC to confirm with GRWG to release the next version of GSICS Product Catalogue URL. ISCCP-NG GSICS Webmeeting 8/12/2020 9

Are we there yet? What Should GSICS Do to meet ISCCP-NG requirements ISCCP-NG GSICS Webmeeting 8/12/2020 10

THANK YOU ISCCP-NG GSICS Webmeeting 8/12/2020 11