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4.25 TRACER
MAINTAINER: Patrick Jöckel
DESCRIPTION: Tracers are chemical species that are transported in the atmosphere
according to the model-calculated wind fields and other processes.
This generic submodel handles the data and metadata associated with tracers.
It also provides the facility to transport user-defined subsets of tracers
together inside a tracer family.
4.26 TROPOP
MAINTAINER: Patrick Jöckel
CONTRIBUTIONS: Michael Traub, Benedikt Steil
DESCRIPTION: This submodel calculates the position of the tropopause.
Two definitions are implemented: A potential vorticity iso-surface (usually
used at high latitudes) and the thermal tropopause according to the definition
of the World Meteorological Organization (WMO), usually used in the
tropics).
4.27 VISO
MAINTAINER: Patrick Jöckel
DESCRIPTION: ’Values on horizontal (Iso)-Surfaces’ is a submodel for userdefined
definition of horizontal iso-surfaces and output of user-defined data
on horizontal surfaces (tropopause, boundary layer height, iso-surfaces, ...).
5 MESSy Coding Standard
As stated above, strict adherence to a coding standard is an absolutely necessary
prerequisite for the maintenance of a very comprehensive Earth System
Models. The full MESSy coding standard has been published in Jöckel et al.
(2005). Here, we only briefly summarize the main points.
For the implementation of the MESSy interface, all changes to the base
model are coded with “keyhole surgery”. This means that changes to the base
model are only allowed if they are really needed, and if they are as small as
possible. Changes to the base model code are encapsulated in preprocessor
directives:
#ifndef MESSY
# else
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