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51 lines
No EOL
1.6 KiB
Python
51 lines
No EOL
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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## @file gamma.py
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from numpy.ma.core import masked_values
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from numpy.ma.core import log
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##
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# Calculate lapse rate from temperature and pressure pairs.
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# This method is derived from the lapserate.f function, which
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# used an extra integer parameter to determine which of 5 functions
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# were to be used. However, only the "4" (pressure) function was
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# being used.
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#
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# @param Tlo: Temperature at lower level (K)
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# @param Plo: Pressure at lower level (mb)
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# @param Thi: Temperature at upper level (K)
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# @param Phi: Pressure at upper level (mb)
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# @return: Lapse rate (C/km)
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def execute(Tlo, Plo, Thi, Phi):
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C = 0.034167
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Tratio = Thi/Tlo
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Pratio = Phi/Plo
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logTratio = log(Tratio)
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logPratio = log(Pratio)
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# Guard against divide-by-zero errors, again
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logPratio = masked_values(logPratio, 0, copy=False)
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result = C * logTratio / logPratio
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return result |