--- MITgcm/model/inc/CPP_OPTIONS.h	2004/04/05 23:42:52	1.31
+++ MITgcm/model/inc/CPP_OPTIONS.h	2006/04/05 21:25:53	1.36
@@ -1,4 +1,4 @@
-C $Header: /home/ubuntu/mnt/e9_copy/MITgcm/model/inc/CPP_OPTIONS.h,v 1.31 2004/04/05 23:42:52 jmc Exp $
+C $Header: /home/ubuntu/mnt/e9_copy/MITgcm/model/inc/CPP_OPTIONS.h,v 1.36 2006/04/05 21:25:53 mlosch Exp $
 C $Name:  $
 
 #ifndef CPP_OPTIONS_H
@@ -22,6 +22,9 @@
 C o Include/exclude Implicit vertical advection code
 #define INCLUDE_IMPLVERTADV_CODE
 
+C o Include/exclude AdamsBashforth-3rd-Order code
+#undef ALLOW_ADAMSBASHFORTH_3
+
 C o Include/exclude nonHydrostatic code
 #undef ALLOW_NONHYDROSTATIC
 
@@ -36,6 +39,29 @@
 C   this implies that surface thickness (hFactors) vary with time
 #undef NONLIN_FRSURF
 
+C o ALLOW isotropic scaling of harmonic and bi-harmonic terms when
+C   using an locally isotropic spherical grid with (dlambda) x (dphi*cos(phi))
+C *only for use on a lat-lon grid*
+C   Setting this flag here affects both momentum and tracer equation unless
+C   it is set/unset again in other header fields (e.g., GAD_OPTIONS.h).
+C   The definition of the flag is commented to avoid interference with
+C   such other header files.
+C   The preferred method is specifying a value for viscAhGrid or viscA4Grid
+C   in data which is then automatically scaled by the grid size;
+C   the old method of specifying viscAh/viscA4 and this flag is provided
+C   for completeness only (and for use with the adjoint).
+C#define ISOTROPIC_COS_SCALING
+
+C o This flag selects the form of COSINE(lat) scaling of bi-harmonic term.
+C *only for use on a lat-lon grid*
+C   Has no effect if ISOTROPIC_COS_SCALING is undefined.
+C   Has no effect on vector invariant momentum equations.
+C   Setting this flag here affects both momentum and tracer equation unless
+C   it is set/unset again in other header fields (e.g., GAD_OPTIONS.h).
+C   The definition of the flag is commented to avoid interference with
+C   such other header files.
+C#define COSINEMETH_III
+
 C o Use "OLD" UV discretisation near boundaries (*not* recommended)
 C   Note - only works with  #undef NO_SLIP_LATERAL  in calc_mom_rhs.F
 C          because the old code did not have no-slip BCs