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\begin{document}

\title{Trends in Downwelling Longwave Radiance over the Southern Great Plains}



\author[1,1]{Lei Liu}%
\author[1,1]{Yi Huang}%
\author[1]{John Richard Gyakum}%
\author[2,2]{David D. Turner}%
\author[3,3]{P. Jonathan Gero}%
\author[1]{John Richard Gyakum}%
\affil[1]{McGill University}%
\affil[2]{NOAA Earth System Research Laboratory}%
\affil[3]{University of Wisconsin–Madison}%


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  \date{May 24, 2024}


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\begin{abstract}
Downwelling longwave radiation (DLR) is an important part of the surface
energy budget. Spectral trends in the DLR provide insight into the
radiative drivers of climate change. In this research, we process and
analyze a 23-year downwelling longwave radiance record measured by the
Atmospheric Emitted Radiance Interferometers (AERI) at the Southern
Great Plains (SGP) site of the Atmospheric Radiation Program. Two AERIs
were deployed at SGP with an overlapping observation period of about 10
years, which allows us to examine the consistency and accuracy of the
measurements and to characterize discrepancies between them due to
undetected instrumentation errors. Using the 23-year record, we analyze
the all-sky radiance trends in DLR, which reflects the associated
surface warming trend at SGP during this same period and also the
complex changes in meteorological conditions. For instance, the observed
radiance in the CO2 absorption band follows closely the near-surface air
temperature variations. The changes in the sky fraction of clear-sky and
thick cloudy-sky scenes offset the radiance changes in the window band.
Our analysis shows that the radiance trend uncertainty in the DLR record
to date mainly results from the climate internal variability rather than
the measurement error, which highlights the importance of continuing the
DLR spectral measurements to unambiguously detect and attribute climate
change.%
\end{abstract}%



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