While broadband flux has been widely used in climate studies, its integrand, the spectral flux, has not been fully utilized in climate studies. I will first describe an algorithm developed in my group to derive such spectral flux from currently available satellite observations over the entire longwave spectrum. Its application in Arctic trend studies and in model evaluations will be then discussed. Next, I will describe the longwave spectral radiative feedbacks as derived from the CMIP3 and CMIP5 archives with a spectral radiative kernel technique, as well as the spectral decomposition of longwave cloud radiative feedback from the A-Train observations and the NCAR CESM simulation. I will then discuss why spectral surface emissivity, instead of broadband emissivity, should be considered in the climate modeling, and how much it can affect the simulated climate in both polar regions and arid areas. If time allows, I will describe two ongoing satellite missions that I participate in, PREFIRE by NASA and FORUM by ESA, and their connections to the spectral studies described above.
Seminar Series Coordinators