# Changeset 1543 for palm/trunk/TUTORIAL/SOURCE

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Timestamp:
Jan 28, 2015 5:13:38 PM (9 years ago)
Message:

small changes in exercise on bulk cloud physics

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1 edited

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 r1537 \frametitle{Hints I} The setup of this exercise is based on the LES-intercomparison BOMEX (Siebesma et al., 2003, JAS): The setup of this exercise is based on the LES-intercomparison BOMEX (Siebesma et al., 2003, J. Atmos. Sci.): %   \only<2>{\begin{center} %      \includegraphics[width=0.7\textwidth]{exercise_cumulus_figures/ptq.pdf} \texttt{initial\_temperature\_difference = 0.4} \item<5-> Think parallel: Mind that the domain of each PE extends only from \texttt{nxlg} to \texttt{nxrg} and \texttt{nysg} to \texttt{nyng}! \item<5-> Think parallel: Mind that the domain of each PE extends only from \texttt{nxlg} to \texttt{nxrg} and \texttt{nysg} to \texttt{nyng}! (Note that the just mentioned dimensions include ghost points) \end{itemize} \end{frame} \begin{itemize} \scriptsize \item<2-> PALM offers two bulk cloud physics schemes: A very simple, one-moment scheme by Kessler (1969, MM) and a state-of-the-art two-moment scheme by Seifert and Beheng (2006, MAP). \item<2-> PALM offers two bulk cloud physics schemes: A very simple, one-moment scheme by Kessler (1969, Meteor. Monogr.) and a state-of-the-art two-moment scheme by Seifert and Beheng (2006, Meteor. Atmos. Phys.). \item<3-> You will use the saturation adjustment scheme, as applied in the Kessler-scheme, for parameterizing condensation. (Note that this kind of scheme is used in the vast majority of today's bulk cloud physics parameterizations.) \begin{frame} \frametitle{$yz$-cross sections at $t \approx \unit[500]{s}$} %   The bubble of warm air rises, but has not reached its condensation level. \begin{center} \includegraphics[width=1.0\textwidth]{exercise_cumulus_figures/500.pdf} %   The bubble of warm air rises, but has not reached its condensation level. \vspace{-5mm} \begin{center} \includegraphics[angle=90,width=1.0\textwidth]{exercise_cumulus_figures/500.pdf} \end{center} \end{frame} \frametitle{$yz$-cross sections at $t \approx \unit[800]{s}$} %   Condensation starts, and the cloud appears as the the visible top of the rising bubble. \begin{center} \includegraphics[width=1.0\textwidth]{exercise_cumulus_figures/800.pdf} \vspace{-5mm} \begin{center} \includegraphics[angle=90,width=1.0\textwidth]{exercise_cumulus_figures/800.pdf} \end{center} \end{frame} \frametitle{$yz$-cross sections at $t \approx \unit[1200]{s}$} %   The cloud is vigorously growing. \begin{center} \includegraphics[width=1.0\textwidth]{exercise_cumulus_figures/1200.pdf} \vspace{-5mm} \begin{center} \includegraphics[angle=90,width=1.0\textwidth]{exercise_cumulus_figures/1200.pdf} \end{center} \end{frame} \frametitle{$yz$-cross sections at $t \approx \unit[1500]{s}$} %   The cloud dilutes and dissipates due to turbulent entrainment of environmental air. \begin{center} \includegraphics[width=1.0\textwidth]{exercise_cumulus_figures/1500.pdf} \vspace{-5mm} \begin{center} \includegraphics[angle=90,width=1.0\textwidth]{exercise_cumulus_figures/1500.pdf} \end{center} \end{frame} {\footnotesize } \begin{itemize} \item See frames 9 -- 12: The clouds develops from a rising bubble of warm air ($t \approx \unit[500]{s}$). Reaching the condensation level ($t \approx \unit[800]{s}$), the cloud appears as the bubbles visible top. Afterwards, the cloud starts to grow more vigorously by the release of latent heat ($t \approx \unit[1200]{s}$). In the end of the cloud's life-cycle, the cloud dissipates by turbulent entrainment of environmental air and the subsequent evaporation of the cloud ($t \approx \unit[1500]{s}$). \item See frames 9 -- 12: The clouds develops from a rising bubble of warm air ($t \approx \unit[500]{s}$). Reaching the condensation level ($t \approx \unit[800]{s}$), the cloud appears as the bubble's visible top. Afterwards, the cloud starts to grow more vigorously by the release of latent heat ($t \approx \unit[1200]{s}$). In the end of the cloud's life-cycle, the cloud dissipates by turbulent entrainment of environmental air and the subsequent evaporation of the cloud ($t \approx \unit[1500]{s}$). \end{itemize} \end{frame}