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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:41 |
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Conference: Bucharest University Faculty of Physics 2018 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Atmospheric scales interaction from Eulerian dynamical perspective in tropospheric jet formation and evolution
Authors:
Daniel CARBUNARU(1), Sorin BURCEA(1)
Affiliation:
1)Administratia Nationala de Meteorologie, Sos. Bucuresti-Ploiesti nr. 97, sector 1, 013686, Bucharest, Romania
E-mail
daniel.carbunaru@meteoromania.ro
Keywords:
Rosby number, local acceleration, atmospheric scales
Abstract:
In this study, the interactions between inertial, Coriolis and pressure gradient forces in some particular tropospheric layers, which resulted in formation of strong middle and upper levels jets, are highlighted. Thus, using a European spatial domain and the ERA 40 reanalysis data (0.75 distance between points), Eulerian Rosby number in each grid points at 300 hPa, 500 hPa, 700 hPa and 850 hPa levels for different atmospheric configurations has been calculated to show the dynamic scales distribution and evolution. Also, local acceleration and time formation of horizontal geopotential gradients have been obtained to show what is the mechanism associated with fluid acceleration (the importance of force action). Conclusions are that Eulerian approach is a favorable one, because it makes possible to see locally (in all reanalysis or model points) what type of scales (macro-beta, meso-alpha, meso-beta) are present and also the interactions between these. The usefulness of identifying these interactions is that the environments favorable to convective phenomena occurrence can be depicted.
References:
Lin, Y.-L., 2007: Mesoscale dynamics. Cambridge University Press, 630 pp.
Markowski P., Y. Richardson, 2010: Mesoscale Meteorology in Midlatitudes.
Royal Meteorological Society. 564 pp.
Orlanski, I., 1975: A rational subdivision of scales for atmospheric processes. Bull Amer. Meteor. Soc., 56, 527-530.
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