48 lines
1.6 KiB
Python
48 lines
1.6 KiB
Python
##
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# This software was developed and / or modified by Raytheon Company,
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# pursuant to Contract DG133W-05-CQ-1067 with the US Government.
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#
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# U.S. EXPORT CONTROLLED TECHNICAL DATA
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# This software product contains export-restricted data whose
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# export/transfer/disclosure is restricted by U.S. law. Dissemination
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# to non-U.S. persons whether in the United States or abroad requires
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# an export license or other authorization.
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#
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# Contractor Name: Raytheon Company
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# Contractor Address: 6825 Pine Street, Suite 340
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# Mail Stop B8
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# Omaha, NE 68106
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# 402.291.0100
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#
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# See the AWIPS II Master Rights File ("Master Rights File.pdf") for
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# further licensing information.
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##
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from numpy import power
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from numpy import where
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def execute(*args):
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##
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# Calculate temperature from pressure and theta.
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# or from pressure, virtual theta, and specific humidity
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# This function accepts numpy arrays
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#
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# @param P: Pressure in millibars
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# @param PoT: theta in degrees Kelvin
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# @return: Potential temperature in degrees Kelvin
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#
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"Calculate temperature from pressure and theta(PoT)."
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# use numpy masked arrays to prevent operating on sentinel values
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P = args[0]
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PoT = args[1]
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pComponent = P/1000.0
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pComponent = power(pComponent, 0.286)
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T = PoT * pComponent
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if len(args) == 3:
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"Calculated VT from pressure and virtual theta, also need to process specific humidity"
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SHx = args[2]
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T = T / (1 + 0.000608 * SHx)
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return T
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