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15 changes: 11 additions & 4 deletions weatherbench2/derived_variables.py
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Original file line number Diff line number Diff line change
Expand Up @@ -686,16 +686,16 @@ def interp_at_one_lat(da: xr.DataArray) -> xr.DataArray:
class AggregatePrecipitationAccumulation(DerivedVariable):
"""Compute longer aggregation periods from existing shorter accumulations.

Note: This assumes a 6h raw time step and prediction_timedelta starting at 6h.

Attributes:
accumulation_hours: Hours to accumulate precipitaiton over
raw_accumulation_name: Name of the 6hr accumulation
raw_accumulation_name: Name of the accumulation
raw_accumulation_hours: Hours of the raw accumulation
lead_time_name: Name of lead_time dimension
"""

accumulation_hours: int
raw_accumulation_name: str = 'total_precipitation_6hr'
raw_accumulation_hours: int = 6
lead_time_name: str = 'prediction_timedelta'

@property
Expand All @@ -711,7 +711,8 @@ def compute(self, dataset: xr.Dataset):

# Compute aggregation steps
steps = float(
np.timedelta64(self.accumulation_hours, 'h') / np.timedelta64(6, 'h')
np.timedelta64(self.accumulation_hours, 'h')
/ np.timedelta64(self.raw_accumulation_hours, 'h')
)
assert steps.is_integer(), 'Accumulation time must be multiple of timestep.'
# Compute accumulation
Expand Down Expand Up @@ -763,4 +764,10 @@ def compute(self, dataset: xr.Dataset):
accumulation_hours=24,
lead_time_name='prediction_timedelta',
),
'total_precipitation_24hr_from_12hr': AggregatePrecipitationAccumulation(
accumulation_hours=24,
lead_time_name='prediction_timedelta',
raw_accumulation_name='total_precipitation_12hr',
raw_accumulation_hours=12,
),
}
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