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update decimal precision for SPFH at different levels #59

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Merged
LinlinCui-NOAA merged 1 commit into from
Sep 30, 2025
Merged

update decimal precision for SPFH at different levels #59

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12 changes: 12 additions & 0 deletions oper/utils/grib2writer.py
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Original file line number Diff line number Diff line change
Expand Up @@ -63,6 +63,18 @@ def create_grib2_message(self, var, da, lead, level=None):
msg.typeOfEnsembleForecast = 3
msg.typeOfData = 4

# update decScaleFactor for specific humidity
# 12 for [5000, 10000]Pa, 10 for [15000, ..., 40000]Pa, 8 for [50000, ..., 100000]Pa
if var == "specific_humidity":
if level >= 5000 and level <= 10000:
msg.decScaleFactor = 12
elif level >= 15000 and level <= 40000:
msg.decScaleFactor = 10
elif level >= 50000 and level <= 100000:
msg.decScaleFactor = 8
else:
raise ValueError(f"level {level} Pa is not included in this model!")

# Set GRIB2 attributes unique to each iteration.
msg.refDate = self.start_date
msg.duration = duration
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