Ground Measurement of Downwelling Longwave Radiation and its Applications
Ìý
Student Seminar Series
Department of Atmospheric & Oceanic Sciences
presents
a talk by
Lei Liu
PhD student
Ground Measurement of Downwelling Longwave Radiation and its Applications
Earth’s energy budget plays an essential role in determining climate change which is crucial to humanity’s survival and sustainable development of the Earth. Downwelling longwave radiation emitted by the atmosphere is one of the most important parts of Earth’s surface energy budget. As a ground measurement, Atmospheric Emitted Radiances Interferometer (AERI) can detect the downwelling IR spectra emitted by atmosphere at high temporal and spectral resolution continuously, no matter day or night, which provides us a wealth of data on the climate change, clouds, aerosols, atmospheric profiling, trace gases, and other important atmospheric parameters.
Identifying the nature and pattern of the variability of downwelling spectral infrared radiances is important because these fluctuations give rise to the change of surface energy balance and can help us understand the downwelling radiation variability in relation to meteorological fields. Thus, we first classify the sky to clear sky or cloudy sky using a neural network and then examine the trends and interannual variability in DLR at SGP. We find that maybe 22 years are not long enough to detect the trends in DLR at most wavenumbers. We also determine the relationship between the interannual changes of DLR for clear sky winter case and meteorological fields such as temperature and water vapor concentrations.
Wednesday Dec 04/ 2.30 PM/ Room 934 Burnside Hall
Ìý