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Article

Consistency and Stability of SNPP ATMS Microwave Observations and COSMIC-2 Radio Occultation over Oceans

1
Earth System Science Interdisciplinary Center, Cooperative Institute for Satellite Earth System Studies (CISESS), University of Maryland, College Park, MD 20740, USA
2
Center for Satellite Applications and Research, NOAA National Environmental Satellite, Data, and Information Service, College Park, MD 20740, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Guillermo Gonzalez-Casado
Remote Sens. 2021, 13(18), 3754; https://doi.org/10.3390/rs13183754
Received: 13 July 2021 / Revised: 14 September 2021 / Accepted: 16 September 2021 / Published: 19 September 2021
Radio occultation (RO) sensor measurements have critical roles in numerical weather prediction (NWP) by complementing microwave and infrared sounder measurements with information of the atmospheric profiles at high accuracy, precision, and vertical resolution. This study evaluates Constellation Observing System for Meteorology, Ionosphere, and Climate 2 (COSMIC-2) wet temperature and humidity data products’ consistency and stability through inter-comparison with SNPP advanced technology microwave sounder (ATMS) measurements. Through the community radiative transfer model (CRTM), brightness temperature (BT) at SNPP ATMS channels are simulated with COSMIC-2 retrieved atmospheric profiles from two versions of the University Corporation for Atmospheric Research (UCAR) wet profiles (WETprf and WETpf2) as inputs to the CRTM simulation. The analysis was focused on ATMS sounding channels CH07–14 and CH19–22 with sounding weighting function peak heights from 3.2 to 35 km. The COSMIC-2 vs. ATMS inter-comparison indicates that their BT biases are consistent, and the latitudinal difference is <0.3 K over three latitudinal regions. The differences between the two versions of UCAR COSMIC-2 wet profiles are identified and attributed to the differences in the implementation of 1DVAR retrieval algorithms. The stability between UCAR near real-time COSMIC-2 wet profile data and ATMS measurements is also well-maintained. It is demonstrated that the well-sustained quality of COSMIC-2 RO data makes itself a well-suited reference sensor to capture the calibration update of SNPP ATMS. Furthermore, the impacts of the assimilation of COSMIC-2 data into the European Centre for Medium-Range Weather Forecasts (ECMWF) model after 25 March 2020, are evaluated by trending observation-minus-background (O-B) biases, which confirms the statistically significant positive impacts of COSMIC-2 on the ECMWF reanalysis. The validation of stability and consistency between COSMIC-2 and SNPP ATMS ensures the quality of RO and microwave sounder data assimilated into the NWP models. View Full-Text
Keywords: COSMIC-2; SNPP ATMS; radiative transfer modeling; radio occultation; ECMWF COSMIC-2; SNPP ATMS; radiative transfer modeling; radio occultation; ECMWF
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MDPI and ACS Style

Shao, X.; Ho, S.-p.; Zhang, B.; Cao, C.; Chen, Y. Consistency and Stability of SNPP ATMS Microwave Observations and COSMIC-2 Radio Occultation over Oceans. Remote Sens. 2021, 13, 3754. https://doi.org/10.3390/rs13183754

AMA Style

Shao X, Ho S-p, Zhang B, Cao C, Chen Y. Consistency and Stability of SNPP ATMS Microwave Observations and COSMIC-2 Radio Occultation over Oceans. Remote Sensing. 2021; 13(18):3754. https://doi.org/10.3390/rs13183754

Chicago/Turabian Style

Shao, Xi, Shu-peng Ho, Bin Zhang, Changyong Cao, and Yong Chen. 2021. "Consistency and Stability of SNPP ATMS Microwave Observations and COSMIC-2 Radio Occultation over Oceans" Remote Sensing 13, no. 18: 3754. https://doi.org/10.3390/rs13183754

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