% cross-references
\def\sc#1{Section~\ref{sc:#1}}
\def\an#1{Appendix~\ref{an:#1}}
\def\ch#1{Chapter~\ref{ch:#1}}
\def\fig#1{Fig.~\ref{fg:#1}}
\def\fg#1{Fig.~\ref{fg:#1}}
\def\figs#1{Figs.~\ref{fg:#1}}
\def\eq#1{Eq.~\ref{eq:#1}}
\def\eqs#1{Eqs.~\ref{eq:#1}}
\def\tb#1{Table~\ref{tb:#1}}


\def\localdir{.}
\def\m{m}
\def\pk{\Pi}

\def\rcp{\kappa}
\def\cp{C_p}
\def\uabs{\tilde{u}_{abs}}
\def\err{\epsilon}
\def\s{ {\dep{\frac{p}{\p0}}}^{\rcp} }
\def\dsig{\dz \sigma}
\def\ps{p_s}
\def\psk{{\ps}^\kappa}
\def\ucov{\tilde{u}}
\def\vcov{\tilde{v}}
\def\ucont{\tilde{\ucov}}
\def\vcont{\tilde{\vcov}}
\def\cu{c_u}
\def\cv{c_v}
\def\h{\theta}
\def\pext{\tilde{p}_s}
\def\fext{f}
\def\dx{\delta_x}
\def\dy{\delta_y}
\def\dz{\delta_z}
\def\K{\frac{1}{2}
\left( \av{\ucov \ucont}{X} + \av{\vcov \vcont}{Y} \right)}
\def\Z{\frac{\dx \vcov - \dy \ucov + \fext}{\av{m}{X,Y}}}
\def\Zm{\frac{- \dy \ucov + \fext}{\av{\pext}{Y}}}

\newcommand{\glob}[1]{ \left< #1 \right> }
\newcommand{\dt}[1]{\frac{\partial #1 }{\partial t} }
\newcommand{\av}[2]{{\overline{#1}}^{ #2 }}
\newcommand{\avg}[1]{\left< #1 \right>}
% \newcommand{\emis}[2]{E \left( #1 , #2 \right) }
\newcommand{\der}[2]{\frac{\partial #1 }{\partial #2} }
\newcommand{\dep}[1]{\left( #1 \right) }
\newcommand{\depb}[1]{\left[ #1 \right] }
\newcommand{\resol}[3]{ {\em #1 longitudes $\times$  #2 latitudes $\times$ #3  niveaux verticaux}}
\newcommand{\Eng}[1]{\textit{\foreignlanguage{english}{#1}}}
% (English language)
\def\t{\theta}
\def\cd{C_D}
