
\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}


{\bf Contribution of the biosphere to the CO$_2$ latitudinal contrasts}
\medskip

{\small
Idealized seasonal cycle for surface emission (null annual mean)\\
GCM and transport models from the Transcom exercize\\
After Dargaville et al.
}

\centerline{\includegraphics[bb=100 200 500 640,clip,width=0.4\textwidth]{/home/hourdin/PRESENTATIONS/IMAGES/PBL/PDF/co2interhemisph.pdf}}


\end{frame}
