id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
710	Important: minor update to 4D-Var algorithms	arango	arango	"This is a minor update to the '''4D-Var''' algorithms:

 * The routines '''load_ADtoTL_tile''' and '''load_TLtoAD_tile''' in '''ini_adjust.F''' were updated to include the multiplication by the land/sea masking before manipulating the adjoint and tangent linear solutions, respectively. This is done to suppress a leak from the land/sea boundaries into the interior solution when the horizontal convolutions are applied. This is needed for '''W4DPSAS''' with '''RPCG''' to give the same solutions as '''I4DVAR'''.  Many thanks to Andy Moore for bringing this to my attention.

 * Added the missing arguments to several routines called in '''normalization.F''' when the option '''GEOPOTENTIAL_HCONV''' is activated.  The horizontal convolution of the error covariance along geopotential is experimental and not fully tested.  Please avoid using this option for now until we advise its usage.

 * Added logic in '''read_asspar.F''' to make sure that '''Lprecond''' is false in input script '''s4dvar.in''' for the dual formulation '''4D-Var''' drivers ('''W4D-PSAS''' and '''W4D-Var''') when the RBLanczos minimization ('''RPCG''') is activated."	upgrade	closed	major	Release ROMS/TOMS 3.7	Nonlinear	3.7	Done