make --closedcontourcmd resolution specific

[chengzhuzhang]

Description

TC detection threshold should be model data resolution depended, currently the pre-processing script is using a threshold for ne120, resulted small number of detected TC events in ne30 simulations. Now update to add resolution specific thresholds.
Note: this fix should bring into cdat migration branch, and zppy implementation.

The original closed contour criteria (--closedcontourcmd "PSL,300.0,4.0,0;_AVG(T200,T500),-0.6,4,0.30"):
requiring an increase in PSL of at least 300 Pa (3 hPa) within 4 Degree of the candidate node,
and a decrease in 200 and 500 hPa average air temperature of 0.6 K within 4 Degree of the node within 0.3 degree of the candidate with maximum air temperature.

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

If applicable:

• New and existing unit tests pass with my changes (locally and CI/CD build)
• I have added tests that prove my fix is effective or that my feature works
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have noted that this is a breaking change for a major release (fix or feature that would cause existing functionality to not work as expected)

[chengzhuzhang]

With --closedcontourcmd "PSL,300.0,4.0,0;_AVG(T200,T500),-0.6,4,0.30" change into --closedcontourcmd "PSL,300.0,4.0,0;_AVG(T200,T500),-0.6,4,1.0", both threshold somehow created same results.

Changing --closedcontourcmd "PSL,300.0,4.0,0;_AVG(T200,T500),-0.6,4,1.0"
to --closedcontourcmd "PSL,300.0,4.0,0;_AVG(T200,T500),-0.6,4,1.2", slightly modified the distribution.

[chengzhuzhang]

Below is a comparison between v3.LR and the base line simulation (v2ish)

With threshold 1.0 only 5 events are detected in 15 years of data LR v3.historical (2000-2014). Results are similar with threshold 0.3.

With the investigation so far, it is determined that:

• At LR, the detection is largely insensitive to the threshold change.
• With same threshold, v3.LR detected much less storms than in v2ish simulation with this algorithm.
• We should test when v3.HR data made available.