[Feature]: Add NOAA20C dataset processing script #1015
Description
Is your feature request related to a problem?
Contributed by @zhangshixuan1987, the NOAA20C dataset is one of the standard datasets used by PCMDI for extratropical modes variability analysis, primarily because it provides a long time series of sea-level pressure (PSL) data. Processing script available from:/lcrc/group/e3sm/public_html/diagnostic_output/ac.szhang/share
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