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1 jmc 1.10 % $Header: /u/gcmpack/manual/s_phys_pkgs/text/generic_advdiff.tex,v 1.9 2006/06/28 02:59:03 molod Exp $
2 edhill 1.1 % $Name: $
3    
4    
5 molod 1.5 \subsection{Generic Advection/Diffusion}
6 edhill 1.1 \label{sec:pkg:gad}
7 edhill 1.3 \begin{rawhtml}
8     <!-- CMIREDIR:package_gad: -->
9     \end{rawhtml}
10    
11 jmc 1.4 The {\tt generic\_advdiff} package contains high-level
12     subroutines to solve the advection-diffusion equation
13     of any tracer, either active (potential temperature,
14     salinity or water vapor) or passive (see pkg/ptracers).
15 jmc 1.10 (see also sections \ref{sec:tracer_equations} to
16     \ref{sec:tracer_advection_schemes}).
17 edhill 1.1
18    
19 molod 1.5 \subsubsection{Introduction}
20 cnh 1.6 Package ``generic\_advdiff'' provides a common set of routines for
21     calculating advective/diffusive fluxes for tracers (cell centered
22     quantities on a C-grid).
23    
24     Many different advection schemes are available: the standard centered
25     second order, centered fourth order and upwind biased third order
26     schemes are known as linear methods and require some stable
27     time-stepping method such as Adams-Bashforth. Alternatives such as
28     flux-limited schemes are stable in the forward sense and are best
29     combined with the multi-dimensional method provided in gad\_advection.
30    
31     \subsubsection{Key subroutines, parameters and files}
32     \label{sec:pkg:gad:implementation_synopsis}
33     There are two high-level routines:
34     \begin{itemize}
35     \item{GAD\_CALC\_RHS} calculates all fluxes at time level ``n'' and is
36     used for the standard linear schemes. This must be used in
37     conjuction with Adams--Bashforth time stepping. Diffusive and
38     parameterized fluxes are always calculated here.
39    
40     \item{GAD\_ADVECTION} calculates just the advective fluxes using the
41     non-linear schemes and can not be used in conjuction with
42     Adams--Bashforth time stepping.
43     \end{itemize}
44 edhill 1.1
45 molod 1.7 \subsubsection{GAD Diagnostics}
46     \label{sec:pkg:gad:diagnostics}
47 edhill 1.1
48 edhill 1.8 {\footnotesize
49 molod 1.7 \begin{verbatim}
50    
51     ------------------------------------------------------------------------
52     <-Name->|Levs|<-parsing code->|<-- Units -->|<- Tile (max=80c)
53     ------------------------------------------------------------------------
54     ADVr_TH | 15 |WM LR |degC.m^3/s |Vertical Advective Flux of Pot.Temperature
55     ADVx_TH | 15 |UU 087MR |degC.m^3/s |Zonal Advective Flux of Pot.Temperature
56     ADVy_TH | 15 |VV 086MR |degC.m^3/s |Meridional Advective Flux of Pot.Temperature
57     DFrE_TH | 15 |WM LR |degC.m^3/s |Vertical Diffusive Flux of Pot.Temperature (Explicit part)
58     DIFx_TH | 15 |UU 090MR |degC.m^3/s |Zonal Diffusive Flux of Pot.Temperature
59     DIFy_TH | 15 |VV 089MR |degC.m^3/s |Meridional Diffusive Flux of Pot.Temperature
60     DFrI_TH | 15 |WM LR |degC.m^3/s |Vertical Diffusive Flux of Pot.Temperature (Implicit part)
61     ADVr_SLT| 15 |WM LR |psu.m^3/s |Vertical Advective Flux of Salinity
62     ADVx_SLT| 15 |UU 094MR |psu.m^3/s |Zonal Advective Flux of Salinity
63     ADVy_SLT| 15 |VV 093MR |psu.m^3/s |Meridional Advective Flux of Salinity
64     DFrE_SLT| 15 |WM LR |psu.m^3/s |Vertical Diffusive Flux of Salinity (Explicit part)
65     DIFx_SLT| 15 |UU 097MR |psu.m^3/s |Zonal Diffusive Flux of Salinity
66     DIFy_SLT| 15 |VV 096MR |psu.m^3/s |Meridional Diffusive Flux of Salinity
67     DFrI_SLT| 15 |WM LR |psu.m^3/s |Vertical Diffusive Flux of Salinity (Implicit part)
68     \end{verbatim}
69 edhill 1.8 }
70 edhill 1.1
71 molod 1.9 \subsubsection{Experiments and tutorials that use GAD}
72     \label{sec:pkg:gad:experiments}
73    
74     \begin{itemize}
75 jmc 1.10 \item{Offline tutorial, in tutorial\_offline verification directory, described in section \ref{sec:eg-offline} }
76 molod 1.9 \item{Baroclinic gyre experiment, in tutorial\_baroclinic\_gyre verification directory, described in
77 jmc 1.10 section \ref{sec:eg-fourlayer} }
78 molod 1.9 \item{Tracer Sensitivity tutorial, in tutorial\_tracer\_adjsens verification directory, described in
79 jmc 1.10 section \ref{sec:eg-simple-tracer-adjoint} }
80 molod 1.9 \end{itemize}

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