CMIP-Data-Request/CMIP7_DReq_Content: Data request content for v1.2.2.5

Changes to variables

1. The variable group biodiv_microclim_hourly was incorrectly requested for the region Southern Ocean and Antarctic (south of 30°). This has now been fixed, which has resulted in a small number of regional variables being removed from the request. These have been replaced by the global equivalent of the variables (which were already requested for other opportunities, so no new variables have been added).
2. One new variable zhalf has been added to the request. this is the time-independent height of model half levels. This specifically requested for the ICON-XPP model, so they can describe the height of the level interfaces for data of the atmospheric component of ICON-XPP that is reported on the native vertical axis (i.e. alevel / alevhalf).
3. Update to four sea-ice variables (sishearvel_tpt-u-hxy-si, sistressmax_tpt-u-hxy-si, sistressave_tpt-u-hxy-si, and sidivvel_tpt-u-hxy-si), which were originally requested for instantaneous values at the middle of the month, to be requested for start of the month to match other time-point monthly samples.

Changes to coordinates

1. The coordinates alevel, alevhalf, olevel, olevhalf were originally requested to have a positive Stored Direction. This has now been set to "" since no consistent direction should be defined for these (as it depends on the specific coordinate type).
2. We have added more specific specific values for different tree types.
3. Updated the long name and description for deltasig

Changes to Experiments

1. The case of experiment names was incorrect in v1.2.2.5 - all experiment IDs were incorrectly in lower case (e.g. picontrol instead of piControl). This has been fixed. As always, the source of truth for experiment IDs is the CMIP7 Controlled Vocabularies (CVs).
2. PMIP experiment eocene-5x was added to the Opportunity 'Paleoclimate Research at the Interface between Past, Present, and Future'