813 Assessing the Performance of SNPP CrIS SDR Data with ICVS

Tuesday, 14 January 2020
Hall B (Boston Convention and Exhibition Center)
X. Jin, SSAI, College Park, MD; and B. Yan, N. Sun, and F. Iturbide-Sanchez

The NOAA Center for Satellite Application and Research (STAR) Integrated Calibration/Validation System (ICVS) plays an important role in detecting anomalies and assessing performance of a series of Joint Polar Satellite System (JPSS) instruments in near real time (NRT)(https://www.star.nesdis.noaa.gov/icvs/index.php). On March 26, 2019 after seven years of stable performance, the Suomi National Polar-orbiting Partnership (SNPP) Cross-track Infrared Sounder (CrIS) instrument suffered a permanent hardware failure of its mid-wave (MW) band, which was first detected by the ICVS. Recently, the SNPP system was successfully switched to side-2, i. e., the redundant side of its electronic board, and data of all three bands are back to normal. The CrIS SDR data also successfully passed its provisional maturity review on July 25, 2019, with the instrumental contribution of the ICVS in providing NRT monitoring results of the instrument performance and the data quality.

In this study, we will address impacts of the MW failure on the CrIS sensor data record (SDR) data, e.g., the loss of real-time zero path difference (ZPD) fringe count for LW and SW bands, the ringing pattern in the LW and SW imaginary radiance, and numerous false alarms of 'invalid data quality' because of 'excessive imaginary radiance' over hot scenes. We will assess the CrIS SDR data performance after the instrument was switched to the side 2 on June 24, 2019. This assessment includes but is not limited to the following analyses: 1) the sampling laser wavelength shift, 2) the focal plane null position issue through the relative spectral biases, 3) the in-track and cross-track servo torque null position issue through the geolocation monitoring, 4) the bit trim mask failure over hot scenes through the processing log, 5) the consistency between side 1 and side 2, and 6) the consistency between SNPP and NOAA-20 CrIS. The Joint Center for Satellite Data Assimilation (JCSDA) Community Radiative Transfer Model (CRTM) is also employed to assess biases in CrIS observations . Therefore, it is expected that this study can provide an overall performance of the CrIS SDR data after the instrument was switched to the side 2 with the ICVS results.
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