id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
717	Important: Error in correct_tracer routine for two-way nesting	arango	arango	"A factor of '''dt(ngc)/dt(ngf)''' was missing in the computation of the vertically integrated tracer flux correction ('''TFF''') in two-way nesting in private routine '''correct_tracer_tile''' of '''nesting.F''':
 {{{
            TFF=TFF*dt(ngc)/dt(ngf)
}}}
The correction is small but it may make a difference in some applications at the refined grid boundary. It assumes that the coarse grid tracer flux remains constant over all fine grid mini-time steps.

Many thanks to Richard Leighton for his excellent [https://www.myroms.org/forum/viewtopic.php?f=19&t=4327 description and solution] to this problem.  Check his [https://www.myroms.org/forum/viewtopic.php?f=14&t=4288 application] before and after the fix."	bug	closed	major	Release ROMS/TOMS 3.7	Nonlinear	3.7	Fixed