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NASA Technical Reports Server (NTRS) 19980008834: Bulk Properties o... |
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by NASA Technical Reports Server (NTRS) |
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Timescales for mixing of midlatitude air into the |
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tropical lower stratosphere are deduced from observations |
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of long-lived tracers N2O and CCl3F. Bulk mixing between |
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tropical and midlatitude regions is assumed to be |
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isentropic and relatively slow compared with local mixing |
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within each region. The mean value of the mixing |
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timescale ranges from 12 to 18 months near 20 km. There |
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is a tendency for shorter mixing times at higher and |
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lower altitudes, although vertical profiles of mixing |
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cannot be definitively established by the data. A more |
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robust quantity is given by the fraction of midlatitude |
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air entrained into the tropical upwelling region. Implied |
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mixing fractions exceed 50% above 22 km. |
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Date Published: 2016-10-13 15:19:50 |
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Identifier: NASA_NTRS_Archive_19980008834 |
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Item Size: 15396872 |
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Language: english |
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Media Type: texts |
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