Influence of ice crystal habit and cirrus spatial inhomogeneities on the retrieval of cirrus optical thickness and effective radius [Elektronische Ressource] / Heike Kalesse

Influence of Ice Crystal Habit andCirrus Spatial Inhomogeneities onthe Retrieval of Cirrus OpticalThickness and Effective RadiusDissertationzur Erlangung des akademischen GradesDoktor der Naturwissenschaften(Dr. rer. nat)Heike KalesseJohannes Gutenberg-Universita¨t MainzFachbereich 08 fur Physik, Mathematik und Informatik¨vorgelegt vonHeike Kalesse, geb. Eichlergeboren in Muhlhausen / Thuringen¨ ¨Mainz, 16.12.2009SummaryThis PhD thesis investigates the influence of ice crystal habit and cirrus spatial inhomo-geneities on the retrieval of cirrus optical thickness and effective ice particle radius. For thispurpose airborne spectral solar radiation measurementsas well as solar and thermal infraredradiative transfer simulations are conducted. Airborne spectral upwelling radiance data areobtained with the Spectral Modular Airborne Radiation measurement sysTem (SMART-Albedometer) within the frame of the CIRrus CLoud Experiment-2 (CIRCLE-2) in May2007. Based on these radiance data a cloud retrieval algorithm is employed to derive cirrusoptical thickness and particle effective radius from one-dimensional (1D) radiative trans-fer calculations. The influence of ice particle shape on retrieved properties is evaluated byvariation of the ice particle single-scattering properties in the retrieval. Also, the impactof ice particle habit on cirrus radiative forcing is studied by radiative transfer simulations.