
\def\V{{\bf v}}
\def\ave#1{\overline{#1}}
\def\mave#1{\tilde{#1}}
\def\q{c}

\begin{frame}
 \frametitle{Boundary layer and transport of atmospheric tracers}

Test of $^{222}$Rn transport : emitted on conitnents only


\centerline{\includegraphics[width=0.8\textwidth]{gcm19.pdf}}


\end{frame}
