*ACC Section

28FEB25

Type

Optional Section

Description

Change default accuracy settings

Structure

Multiple PARAMETER=VALUE fields, any order. No spaces either side of the '='.

Fields

Parameter	Type	Description	Units	Range	Default
NGJACC	I	Number of gases for which Jacobians are computed[2]		≥ 1	NRTV
PGCACC	R	Fractional change in pressure requiring new C-G path calc		≥ 0	0.01
TGCACC	R	Change in temperature requiring new C-G path calc	K	≥ 0	0.1
JCPACC	R	Fraction of Jacobian perturbation requiring additional path		≥ 0	0.01

Type: I=Integer; R=Real

Notes

1. Default values are set in module acccom_dat.f90, except for NGJACC which is set in drvrtv_sub.for

2. NGJACC: For the default setting, TEM and PRE both count as 'retrieved species' (NRTV) so Jacobians are only calculated for the primary (and secondary, in the case of TEM+PRE) absorbing molecules in each microwindow

3. Default values can be made more stringent simply by adding the ACC Flag in the *FLG section, in which case NGJACC becomes the total number of absorbers, and the other parameters are all reduced by a factor 10. Any settings in this section will then override these new defaults.

Example

*ACC NGJACC=4 TGCACC=0.2

• MORSE Index