A numerical study of the outflow layer of tropical cyclones
Numerical simulations of idealized tropical cyclones with special emphasis on the outflow layer are presented. The quasi-steady state outflow layers of weak and strong cyclones are found to exhibit similar characteristics. The circulations are anticyclonic and asymmetric about the center; the outflo...
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| Veröffentlicht in: | Monthly weather review 1990-10, Vol.118 (10), p.2042-2055 |
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| container_title | Monthly weather review |
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| creator | Shi, Jainn-Jong Raman, Sethu Chang, Simon Wei-Jen |
| description | Numerical simulations of idealized tropical cyclones with special emphasis on the outflow layer are presented. The quasi-steady state outflow layers of weak and strong cyclones are found to exhibit similar characteristics. The circulations are anticyclonic and asymmetric about the center; the outflow layer is dominated by a narrow, elongated outflow-jet contributing up to 50 percent of the angular momentum transport; the air particles in the outflow jet mostly originate from the lower level. Secondary circulations are found to influence the relative humidity and the potential vorticity at the outflow levels. In order to study the effect of upper tropospheric forcings, two variational numerical experiments using cumulus convection as the major link between the upper-level forcing and the tropical cyclone's response are conducted. |
| doi_str_mv | 10.1175/1520-0493(1990)118<2042:ansoto>2.0.co;2 |
| format | Article |
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The quasi-steady state outflow layers of weak and strong cyclones are found to exhibit similar characteristics. The circulations are anticyclonic and asymmetric about the center; the outflow layer is dominated by a narrow, elongated outflow-jet contributing up to 50 percent of the angular momentum transport; the air particles in the outflow jet mostly originate from the lower level. Secondary circulations are found to influence the relative humidity and the potential vorticity at the outflow levels. In order to study the effect of upper tropospheric forcings, two variational numerical experiments using cumulus convection as the major link between the upper-level forcing and the tropical cyclone's response are conducted.</description><identifier>ISSN: 0027-0644</identifier><identifier>EISSN: 1520-0493</identifier><identifier>DOI: 10.1175/1520-0493(1990)118<2042:ansoto>2.0.co;2</identifier><identifier>CODEN: MWREAB</identifier><language>eng</language><publisher>Legacy CDMS: American Meteorological Society</publisher><subject>Convection, turbulence, diffusion. 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The quasi-steady state outflow layers of weak and strong cyclones are found to exhibit similar characteristics. The circulations are anticyclonic and asymmetric about the center; the outflow layer is dominated by a narrow, elongated outflow-jet contributing up to 50 percent of the angular momentum transport; the air particles in the outflow jet mostly originate from the lower level. Secondary circulations are found to influence the relative humidity and the potential vorticity at the outflow levels. In order to study the effect of upper tropospheric forcings, two variational numerical experiments using cumulus convection as the major link between the upper-level forcing and the tropical cyclone's response are conducted.</description><subject>Convection, turbulence, diffusion. 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| ispartof | Monthly weather review, 1990-10, Vol.118 (10), p.2042-2055 |
| issn | 0027-0644 1520-0493 |
| language | eng |
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| source | American Meteorological Society; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; NASA Technical Reports Server; Alma/SFX Local Collection |
| subjects | Convection, turbulence, diffusion. Boundary layer structure and dynamics Earth, ocean, space Exact sciences and technology External geophysics Meteorology Meteorology And Climatology |
| title | A numerical study of the outflow layer of tropical cyclones |
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