http://www.cnr.it/ontology/cnr/individuo/prodotto/ID44771
Simulations of moist nearly neutral flow over a ridge (Articolo in rivista)
- Type
- Label
- Simulations of moist nearly neutral flow over a ridge (Articolo in rivista) (literal)
- Anno
- 2005-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1175/JAS3410.1, 2005 (literal)
- Alternative label
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- M.M. Miglietta, R.Rotunno (literal)
- Pagina inizio
- Pagina fine
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Rivista
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
- Note
- Scopu (literal)
- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- CNR-Istituto di Scienze dell'Atmosfera e del Clima, Lecce, Italy
National Center for Atmospheric Research, Boulder, Colorado (literal)
- Titolo
- Simulations of moist nearly neutral flow over a ridge (literal)
- Abstract
- Although a fairly common atmospheric condition in orographic-rain scenarios, there is relatively little
known about moist neutral flows over a ridge from theory and modeling. Presented in this paper are
numerical simulations of the orographic-flow modification occurring for a two-dimensional moist nearly
neutral flow over a ridge in the regime where the Coriolis force can be neglected. If an initially saturated
moist neutral flow were to remain everywhere saturated as it flows over an obstacle, then the expected
solution would be the linear solution because the condition for linearity (hill height less than the ambient
wind velocity/static stability) is always met. However, for higher mountains, the solutions indicate the
development of areas of unsaturated air, with correspondingly larger values of local static stability. This
internal switching from small to large values of static stability is an inherent nonlinearity, which has
far-reaching consequences for understanding the orographic-flow modification in this regime. The sensitivity
of the solution to the mountain height and to the initial cloud water content is analyzed here. The
authors find that the solutions fall into three basic categories. If the mountain height is small enough, a
saturated flow can be maintained everywhere given sufficient initial cloud water; for tall mountains the
atmosphere upwind of the mountain is maintained in a saturated state and transitions to an unsaturated
downslope flow on the lee side, which has characteristics associated with downslope windstorms; for mountains
of intermediate height, the solutions show the existence of an upwind-propagating disturbance that has
the effect of desaturating the atmosphere above the mountain. (literal)
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