Users' Feedback on GSICS Products in Demonstration Phase Fangfang Yu On behalf of GSICS Coordination Center 06 September 2011 Welcome users feedback, now or after workshop.
Fuzhong Weng, GCC Director, has nominated Xiuqing (Scott) Hu as Acting Deputy Director. GSICS 3rd Users Workshop GSICS Procedure for Product Acceptance (GPPA) Current Product Status Progress of Candidate Products in Demonstration Phase GL01.1.0 - GSICS Correction for EUMETSAT IR Channels based on IASI GL02.1.0 - GSICS Correction for MTSAT IR Channels based on AIRS and IASI GL03.1.0 - GSICS Correction for GOES Imager IR Channels based on AIRS and IASI
Achieved flow of near-real time data and re-analysis data to GSICS Servers ATBD and Traceability to SI Standards documents were accepted as of March 3, 2011 Documentation of use of associated radiative transfer models and cal/val supporting measurements under review Testing by two or more potential users of product GL04.1.0 GSICS Correction for GOES Sounder IR Channel based on IASI Achieved flow of near-real time data to GSICS Servers
LL01.1.0 - Patmos-X AVHRR solar reflective channel corrections based on MODIS Achieved flow of near-real time data to NOAA GSICS Server Under testing by three or more potential users of product Submitted ATBD and Traceability to SI Standards documents
LL01.2.0 Consistent level-1C radiances and upper airs deep-layer temperature climate data records from MSU/AMSU observation Submitted ATBD GSICS 3rd Users Workshop Progress in GSICS Product Evaluation During Demonstration Phase GCC Director to collect and disseminate users feedback regarding product's data usability and format.
External users feedback for EUMETSAT/JMA/NOAA GEO-LEO products have been received GSICS 3rd Users Workshop Users Feedbacks Internal users vs. external users Internal users calibration community External Users Feedback GEO-LEO IR ATBD for Imager IR
Data (calibration coefficients etc) for Imager IR Impacts on the products both formal and unformal Internal Users Evaluate, monitor and diagnose calibration accuracy Midnight calibration anomaly decontaminations Spectral response function correction GSICS 3rd Users Workshop Feedback on ATBDs Clarify generally well understood, straightforward and could be
produced without problem Utility The method was fully adequate for the tested product. Reproducibility well documented, so it would be no difficulty to reproduce the results. GSICS 3rd Users Workshop Feedback on the Product Data Data Accessibility
Intuitive, the download extremely fast Data Availability No problem Data Ease of Use Applicability of the GSICS correction was ensured, no problems encountered concerning the metadata. Some users may need to learn how to read the netCDF files Some users ask for the brightness temperature (Tb) dependent products Solutions: the instruction to read the netCDF and conversion between radiance to Tb are provided at the FAQ&Tools webpage
Product Suitability Did not find any problems Product Reliability No problem here GSICS 3rd Users Workshop EUMETSAT Products Global Instability Indices Product TPW derived with nominal MET9 radiance
TPW derived with GSICS corrected radiance GSICS 3rd Users Workshop EUMETSAT Products Cloud Top Height Retrieval GSICS 3rd Users Workshop EUMETSAT Products Effect of GSICS calibration on CM SAFs cloud products
original calibrated Cloud Fractional Cover: daily mean EUMETSAT Products Effect of GSICS calibration on CM SAFs cloud products Negative values: More clouds with calibration
EUMETSAT Products Effect of GSICS calibration on CM SAFs cloud products Cloud mask statistics original calibrated o Some pixel are flagged as clear now (cloudy before), about twice as much crop up (clear before) o Equally distributed in space EUMETSAT Products
Effect of GSICS calibration on CM SAFs cloud products Cloud fraction for different cloud types original o More cloudy pixel o Noticeable rise of high semitransparent cloud class calibrated EUMETSAT Products Effect of GSICS calibration on CM SAFs cloud products original
calibrated No calibration for visible channels so far -> effect on thresholds for cloud type determination EUMETSAT Products Effect of GSICS calibration on CM SAFs cloud products neg. values refer to higher clouds with calibration
EUMETSAT Products Effect of GSICS calibration on CM SAFs cloud products EUMETSAT Products Effect of GSICS calibration on CM SAFs cloud products Request for calibration in visible channels -> Can cause problems with consistency Validation with ground based data will be carried out GSICS 3rd Users Workshop 17
JMA Products SST Retrieval Fig-1 Differences between SSTs with and without GSICS correction (corrected SST non corrected SST) Left shows the result for 2011.1.8 and right shows it for 2011.3.1. GSICS 3rd Users Workshop JMA Products SST Retrieval Fig-2 Mean differences (MTSAT SST minus in-situ SST) and standard deviations against in-situ SSTs Statistics for the SSTs with and without GSICS correction are plotted with red and blue, respectively. Left shows the result for 2011.1.8 and right shows it for 2011.3.1.
Figure. Anomaly correlation for 500 hPa geopotential height over (a) Tropical, (b) North Hemisphere. Black line is the anomaly correlation for the simulation without GSICS calibration correction and the red line is for the simulation with GSICS calibration correction. GSICS 3rd Users Workshop GOES-11 Sounder Cloud Top Pressure for 7 September 2010, nominal 18UTC image, generated using: GSICS coefficients as bias correction.
The Simple Bias correction. The difference (GSICS-Simple) in the bias correction methods, which demonstrates that with the GSICS bias some of the high clouds (north, southeast portions of the image) get higher and some of the lower clouds (Pacific) get lower (higher pressure). It also appears that the GSICS bias takes out more of the noise. GSICS 3rd Users Workshop
25 GOES Sounder Cloud-top pressure Fairly noisy higher cloud pixels GSICS seems to improve (less noise) upon the simple bias correction method for26this case, although the masks seems to be adversely affected. GOES Sounder Cloud-top pressure More uniform cloud pixels
27 GOES Sounder Cloud-top pressure Fairly noisy higher cloud pixels and missing clouds GSICS seems to improve (less noise) upon the dynamic bias correction method for this 28 case GOES Sounder Cloud-top pressure
More uniform cloud pixels and more low cloud 29 Internal Users Evaluate radiometric calibration accuracy Identify and correct the root cause that compromise calibration accuracy, e.g., revising the system spectral response function, decontamination, midnight calibration anomaly.
G15m) Ch3 GSICS 3rd Users Workshop Conclusions External users Outside users have very positive feedbacks on the ATBDs and correction data availability. Imager: Apparent impacts of the products relied on the MET-9 and GOES-12 13.3m)m channel data. Also may have impacts on the SST retrieval
Correction for the visible channel is requested for the CMSAF cloud products Sounder: Initiative results of cloud top pressure is encouraging GSICS 3rd Users Workshop Conclusions Internal users Each agent use it to evaluate, monitor and diagnose the calibration accuracy More successful examples to shift the SRF to improve the
GSICS Product Acceptance Team (GPAT) and product providers to examine and remediate the submitted documents (radiative transfer models and cal/val supporting measurements) being consolidated into one document for all GEO-LEO IR GSICS Correction products. GSICS 3rd Users Workshop GEO-LEO Back Processing @ Univ. Wisconsin IASI Jun2007
AIRS Aug2003 GOES-8 105W Back Process Plan @ Univ. Wisconsin Jun06 GOES-10 Jun06 Jan07 Jan11
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