Comment on some relations between the shape of streamlines and frontal interface in the proximity of a cyclonic vortex

1971 ◽  
Vol 15 (3-4) ◽  
pp. 382-392
Author(s):  
Pavla Kočíková-Hlachová ◽  
M. Škoda
Keyword(s):  
Cyclonic Vortex ◽  
Frontal Interface

scholarly journals Observations of a Deep Submesoscale Cyclonic Vortex in the Arabian Sea

2020 ◽  
Vol 47 (13) ◽  
Author(s):  
Charly Marez ◽  
Xavier Carton ◽  
Stéphanie Corréard ◽  
Pierre L'Hégaret ◽  
Mathieu Morvan
Keyword(s):  
Arabian Sea ◽  
Cyclonic Vortex

Cloud Structure of an Occluded Cyclone Over the Gulf of Alaska as Viewed by TIROS I1

1961 ◽  
Vol 42 (3) ◽  
pp. 151-165 ◽  
Author(s):  
Jay S. Winston ◽  
Lloyd Tourville
Keyword(s):  
Inner Core ◽  
Meteorological Data ◽  
Broad Band ◽  
Gulf Of Alaska ◽  
Polar Front ◽  
The Other ◽  
Cloud Structure ◽  
Cyclonic Vortex ◽  
Cyclonic Flow ◽  
Made In

The cloud structure of an occluded cyclone and its environs over the Gulf of Alaska is revealed in detail by a series of TIROS pictures. The pictures clearly portray:(1) the nature and extent of dense cloudiness around the inner core of the cyclone;(2) a broad band of cloudiness associated with the main polar front;(3) the pattern of overrunning cloudiness marking a newly developing wave south of the main storm;(4) a previously undetected, old cyclonic vortex in mid-troposphere; and(5) the striking cellular arrangement of cumuliform clouds in the cyclonic flow to the rear of the storm. These features are related to the conventional meteorological data and analyses over this area and are found in many places to corroborate them rather well. On the other hand, there are several places, particularly in view of the sparsity of conventional data, where the cloud pictures suggest that improvements could be made in the map analyses and numerically computed vertical motions on the basis of the TIROS cloud information.

How a mesoscale cyclonic vortex over Sahara leads to a dust outbreak in South-western Iberia

2021 ◽  
Vol 249 ◽  
pp. 105302
Author(s):  
Flavio Tiago Couto ◽  
Eduardo Henrique Chaves Cardoso ◽  
Maria João Costa ◽  
Rui Salgado ◽  
Juan Luis Guerrero-Rascado ◽  
...  
Keyword(s):  
Cyclonic Vortex

scholarly journals Simulations of stratospheric sudden warmings in the Berlin troposphere-stratosphere-mesosphere GCM

1996 ◽  
Vol 14 (4) ◽  
pp. 443-463 ◽  
Author(s):  
P. Erlebach ◽  
U. Langematz ◽  
S. Pawson
Keyword(s):  
Opposite Sign ◽  
Wave Activity ◽  
North Pole ◽  
Temperature Changes ◽  
The North ◽  
Stratospheric Sudden Warmings ◽  
Cyclonic Vortex ◽  
Transient Events ◽  
Low Levels ◽  
The Tropics

Abstract. Stratospheric sudden warming events in the Northern Hemisphere of the Berlin TSM GCM are investigated. In about 50% of the simulated years (13 out of 28), major midwinter warmings occur. This agrees well with observations but, whereas real events tend to occur approximately every second season, those in the model are clustered, most of them occur in the period between years 15/16 and years 24/25. In most other years, minor warming events take place. The warming events are found earlier in the winter than in reality. Many of the observed characteristics of warming events are well captured by the model: pulses of wave activity propagate out of the troposphere; these transient events force the zonal-mean zonal wind in the stratosphere and coincide with increases of the temperature at the North Pole and cooling at low levels in the tropics; temperature changes of opposite sign are modelled at higher levels. Synoptically, the modelled stratosphere evolves quite realistically before the warmings: the cyclonic vortex is displaced from the Pole by an amplifying anticyclone. After minor warmings, the stratosphere remains too disturbed as the cyclonic centre does not return to the North Pole as quickly as in reality. In the aftermath of major warmings the cyclonic vortex is not fully eroded and the anticyclonic circulation does not develop properly over the Pole; furthermore, the wintertime circulation is not properly restored after the event.

The Influence of Environmental Low-Level Shear and Cold Pools on Tornadogenesis: Insights from Idealized Simulations

2013 ◽  
Vol 71 (1) ◽  
pp. 243-275 ◽  
Author(s):  
Paul M. Markowski ◽  
Yvette P. Richardson
Keyword(s):  
Heat Sink ◽  
Wind Shear ◽  
Vertical Wind Shear ◽  
Heat Sinks ◽  
Streamwise Vorticity ◽  
Near Surface ◽  
Low Level ◽  
Cold Pools ◽  
Cyclonic Vortex ◽  
Negative Buoyancy

Abstract Idealized, dry simulations are used to investigate the roles of environmental vertical wind shear and baroclinic vorticity generation in the development of near-surface vortices in supercell-like “pseudostorms.” A cyclonically rotating updraft is produced by a stationary, cylindrical heat source imposed within a horizontally homogeneous environment containing streamwise vorticity. Once a nearly steady state is achieved, a heat sink, which emulates the effects of latent cooling associated with precipitation, is activated on the northeastern flank of the updraft at low levels. Cool outflow emanating from the heat sink spreads beneath the updraft and leads to the development of near-surface vertical vorticity via the “baroclinic mechanism,” as has been diagnosed or inferred in actual supercells that have been simulated and observed. An intense cyclonic vortex forms in the simulations in which the environmental low-level wind shear is strong and the heat sink is of intermediate strength relative to the other heat sinks tested. Intermediate heat sinks result in the development (baroclinically) of substantial near-surface circulation, yet the cold pools are not excessively strong. Moreover, the strong environmental low-level shear lowers the base of the midlevel mesocyclone, which promotes strong dynamic lifting of near-surface air that previously resided in the heat sink. The superpositioning of the dynamic lifting and circulation-rich, near-surface air having only weak negative buoyancy facilitates near-surface vorticity stretching and vortex genesis. An intense cyclonic vortex fails to form in simulations in which the heat sink is excessively strong or weak or if the low-level environmental shear is weak.

The role of horizontal rolls in rapid intensification of cyclonic vortex

2021 ◽  
Author(s):  
Andrei Sukhanovskii ◽  
Elena Popova
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Heat Transfer Process ◽  
Rapid Intensification ◽  
Rapid Variation ◽  
Convective Structures ◽  
Cyclonic Vortex ◽  
Laboratory Analog ◽  
Boundary Layer Formation

<p>The present laboratory study is focused on the role of convective rolls in enhancement of the heat flux from the sea and triggering of the process of rapid intensification of tropical cyclones. The appearance of coherent convective structures such as thermals and rolls are registered by different optical techniques and temperature measurements. Two-dimensional velocity fields are used for the study of the structure and characteristics of the flow. The heat flux from the heating plate to the fluid is measured directly. Obtained results clearly show that rapid intensification of a laboratory analog of a tropical cyclone is tightly linked with the heat transfer process in the boundary layer. Formation of secondary convective structures strongly increases the heat transfer and intensity of convective circulation. Intensity of radial inflow is a crucial aspect for the intensification of cyclonic vortex, hence rapid variation of the heat transfer is a factor that has a substantial influence on the dynamics of a laboratory vortex. </p>

Sign in / Sign up

Export Citation Format

Share Document