Mathematics – Logic
Scientific paper
Sep 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000kfnts...3...64t&link_type=abstract
Kinematika i Fizika Nebesnykh Tel, Suppl, no. 3, p. 64-65
Mathematics
Logic
Scientific paper
On basis of the aerological data, obtained at six stations of Ukraine in day- and night-time during a year, inversion of t emperature t and of partial pressure of water vapour e in troposphere are investigated. The criterion of presence of inversion was the condition (f2-f1) ≥ Δ f, where f1 and f2 are the measured parameters at lower and upper atmospheric layers, Δ f - accuracy of measurement (or determination) of parameter f. Statistical data on inversions of t and e are given in Table 1. Inversions of {t taking place in night occur about 2-3 times more often than in day, mainly at the expense of radiative inversions, which begins at the ground level. Inversions of {t causes the corresponding inversions of {e, but the place and the power (the thickness of layer) of these inversions do not always coincide. A majority of inversions of {t and {e in day are placed above the ground level. There are approximately the same quantity of inversions of {e at day and night. Inversions of {e causes the corresponding inversions of index refraction of water vapour {N. The placing and the power of inversions of {e and {N are in good agreement. The range correction due to water vapour will be greater in case of existence of inversions of N. Results of wet range correction calculation both with inversions (Δ ρ) and without inversions (Δ ρ') are given in Table 2. In this table h1 means the altitude, at which inversion begins, Δ h is power of inversion, Δ e = e2-e1 and Δ N is inversion intensity of e and {N, respectively. In Table 2 superscripts 1) means Chernivci, night; 2) means L'viv, night; 3) means Kyiv, night. As one can see from Table 2, Δ ρ - Δ ρ' is large, when Δ e and corresponding Δ N are large. Also Δ ρ -Δ ρ' increases, when Δ h increases, although this dependence is not so evident. All calculations were done for zenith direction. The maximal contribution of inversion of e to range correction is 5 cm. This value is large enough because of the total wet range correction is equal to 20-40 cm in zenith direction. At larger zenith angles this contribution increases, but question arises whether we can use an assumption of spherical-symmetric atmosphere at large zenith angles.
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