Improving the Understanding of CrIS Full Spectral Resolution Nonlocal Thermodynamic Equilibrium Radiances Using Spectral Correlation

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dc.contributor.authorLi, Zhenglong
dc.contributor.authorMenzel, W. Paul
dc.contributor.authorJung, James
dc.contributor.authorLim, Agnes
dc.contributor.authorLi, Jun
dc.contributor.authorMatricardi, Marco
dc.contributor.authorLópez‐Puertas, Manuel
dc.contributor.authorDeSouza‐Machado, Sergio
dc.contributor.authorStrow, Larrabee
dc.date.accessioned2021-04-07T17:01:24Z
dc.date.available2021-04-07T17:01:24Z
dc.date.issued2020-07-25
dc.description.abstractIn recent years, significant progress has been made in fast radiative transfer model (RTM) simulation of daytime nonlocal thermodynamic equilibrium (NLTE) emission. However, NLTE remains as one important reason that prevents the hyperspectral shortwave infrared (SWIR) radiance observations from being assimilated into numerical weather prediction (NWP) models. To better understand the limitations of existing RTM‐based NLTE simulation, this study introduces a new statistical method, called Spectral Correlations to Estimate Non‐Local Thermal Equilibrium (SCENTE), to estimate the NLTE radiances in the Cross‐track Infrared Sounder (CrIS) SWIR radiance observations. SCENTE is applied to four typical season days, including spring equinox, summer solstice, fall equinox, and winter solstice. By analyzing calculation/background minus observation (BMO) of CrIS SWIR brightness temperature (BT), results show that SCENTE characterizes the NLTE well with standard deviation of differences (STD) comparable to observation noise for both daytime and nighttime, while the community RTM (CRTM) has substantially larger STD at night, mainly due to the lack of daytime NLTE just beyond the day/night terminator and the lack of aurora‐related NLTE. Detailed investigation of the biases of BMO shows that CRTM underestimates daytime SWIR NLTE effects by 0.76 K, while SCENTE overestimates SWIR NLTE effects by 0.70 K. The overestimation is because SCENTE uses CRTM‐simulated SWIR local thermodynamic equilibrium (LTE) radiances in the training, which is underestimated by 0.70 K in BT. SCENTE, complementary to RTM‐based simulations, can be used for quality control of SWIR radiances for assimilation and retrieval of atmospheric soundings.en_US
dc.description.sponsorshipThis work is supported by CIMSSinternal funding and GOESR and JPSSscience projects at CIMSS of theNational Oceanic and AtmosphericAdministration (NA15NES4320001).The views, opinions, and ndingscontained in this report are those of theauthors and should not be construed asan ofcial National Oceanic andAtmospheric Administration's or U.S.Government's position, policy, ordecision. The authors thank Dr.Christopher D. Barnet, Dr. Di Di, andDr. Wenguang Bai for their valuablediscussion, comments, and suggestionson this work and the three anonymousreviewers for their very usefulcomments to improve our paper.Timothy J. Schmit of NOAA NESDI S isthanked for a review of the manuscript.Manuel LópezPuertas was supportedby the Spanish Ministerio de Ciencia,Innovación y Universidades (MICINN)under Project ESP201787143RandECFEDER (European RegionalDevelopment Fund) fundsen_US
dc.description.urihttps://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2020JD032710en_US
dc.format.extent18 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2bxv1-qrmz
dc.identifier.citationLi, Z., Menzel, W. P., Jung, J., Lim, A., Li, J., Matricardi, M., et al. (2020). Improving the understanding of CrIS full spectral resolution nonlocal thermodynamic equilibrium radiances using spectral correlation. Journal of Geophysical Research: Atmospheres, 125, e2020JD032710. https://doi.org/10.1029/2020JD032710en_US
dc.identifier.urihttps://doi.org/10.1029/2020JD032710
dc.identifier.urihttp://hdl.handle.net/11603/21290
dc.language.isoen_USen_US
dc.publisherAGU Pubicationen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Physics Department Collection
dc.relation.ispartofUMBC Faculty Collection
dc.relation.ispartofUMBC Joint Center for Earth Systems Technology (JCET)
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
dc.rights©2020. American Geophysical Union. All Rights Reserved.
dc.subjectUMBC High Performance Computing Facility (HPCF)
dc.titleImproving the Understanding of CrIS Full Spectral Resolution Nonlocal Thermodynamic Equilibrium Radiances Using Spectral Correlationen_US
dc.typeTexten_US

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