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Sunday, May 17, 2020 | History

2 edition of Fronts and frontogenesis as revealed by high time resolution data found in the catalog.

Fronts and frontogenesis as revealed by high time resolution data

A. E. Frank

Fronts and frontogenesis as revealed by high time resolution data

by A. E. Frank

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  • 15 Currently reading

Published by N.A.S.A. .
Written in English


Edition Notes

Statement[by] A.E. Frank and D.A. Barber.
SeriesNASA RP 1005
ContributionsBarber, D. A., United States. National Aeronautics and Space Administration.
ID Numbers
Open LibraryOL20636104M

  Frontogenesis is a meteorological process of tightening of horizontal temperature gradients to produce fronts. In the end, two types of fronts form: cold fronts and warm fronts. Upper-Level Frontogenesis Cliff Mass University of Washington CAT Associated With Upper Level Front and the Lower Stratosphere Richardson Number (small less stable) Turbulence is Maximum Above and Below the Jet Due to Large Shear Jet Core Level Large Shear Large Shear Turbulence Upper Level Frontogenesis for the Storm hPa hPa Why Upper Level Fronts?

Upper-Level Frontogenesis Reed Vertical Cross Section A Series of Aircraft-Based Field Experiments Described the Structure of Upper Level Fronts for A First Time Potential Vorticity As a Tracer of Air Parcel Origin Potential vorticity is high in the stratosphere because of the large stability there. showed that high levels of. Frontogenesis in the North Pacific Oceanic Frontal Zones--A Numerical Simulation Michael S. Dinniman Advanced Very High Resolution Radiometer (AVHRR) data (Smith ) for February and August (Fig. 1). to produce convergence at the front, strongly favoring frontogenesis. However, many recent studies have iden- Cited by:

Frontogenesis Tilting Frontogenesis Tilting Frontogenesis Keyser et al () 2-D Primitive Equation Simulation Clear differential Vertical motion Across upper front Confluence can become important at the upper front moves around the upper trough The End * Early Days In the first half of the 20th century there was no concept of upper-level fronts. A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more


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Fronts and frontogenesis as revealed by high time resolution data by A. E. Frank Download PDF EPUB FB2

These analyses are then used to study the evolution of the front. The front is found to consist of a complex system of fronts occurring at all levels of the troposphere. Low level fronts are strongest at the surface and rapidly weaken with height.

Fronts in the middle Cited by: 1. FRONTS AND FRONTOGENESIS AS REVEALED BY HIGH TIME RESOLUTION DATA PURPOSE OF THE STUDY Fronts, which are sloping stable layers characterized by large values of baroclinity and horizontal and vertical wind shear, are typical features of the atmosphere.

Indeed. Graduation date: Upper air soundings taken every three hours are used\ud to examine a cold front of average intensity over a period\ud of 24 hours. Vertical cross sections of potential temperature\ud and wind and horizontal analyses are compared and adjusted\ud until they are consistent with one another.

Frank, A. E., and D. Barber, Fronts and frontogenesis as revealed by high time resolution data. NASA/Marshall Space Flight Center, ALNASA RP Cited by: Low level fronts were strongest at the surface and rapidly weakened with height.

Fronts in the midddle troposphere were much more intense. The warm air ahead of the fronts was nearly barotropic, while the cold air behind was baroclinic through deep layers. A deep Author: A. Frank and D. Barber. Frontogenesis, a primary forcing mechanism for these vertical motions, is the process by which the thermal and moisture gradients between air masses are concentrated into narrow zones called fronts.

During frontogenesis, cloud and precipitation producing transverse vertical circulations are generated, with ascending motion, concentrated into a quasi-linear narrow zone parallel to a front, on the warm side of the front.

other cases, fronts may dissolve and develop into a field of continuous distribution of the various elements. The processes which lead to the formation of a front or the increase in intensity of an existing front, are called jrontogenetical processes; and the processes which lead to the dissolution of fronts are calledjrontolytical processes.

Fronts then had to be viewed as being formed in a growing nonlinear baroclinic wave, though this secondary role in no way diminished their importance in practical meteorology. The theoretical interest shifted towards the mechanism for generating fronts, namely frontogenesis.

When upper air data became available in the s it was apparent thatFile Size: KB. Frontogenesis is the generation or intensification of a front. It occurs when warm air converges onto colder air, and the horizontal temperature gradient amplifies by at least an order of magnitude.

Whenever a region experiences horizontal convergence (and therefore uplift), any pre-existing gradient will increase. Get this from a library.

Fronts and frontogenesis as revealed by high time resolution data. [Albert E Frank; David A Barber]. Understanding Front Formation and Types of Fronts is important to understand the formation of Mid-latitude cyclones and the dominant weather patterns of mid latitudes. Fronts Fronts are the typical features of midlatitudes weather (temperate region – 30° - 65° N and S).

They are uncommon (unusual) in tropical and polar regions. Front is a three dimensional boundary zone formed between. Frontogenesis and Frontal Progression of a Trapping-Generated Estuarine Convergence Front and Its Influence on Mixing and Stratification Sarah N. Giddings & Derek A. Fong & Stephen G.

Monismith & C. Chris Chickadel & Kathleen A. Edwards & William J. Plant & Bing Wang & Oliver B. Fringer & Alexander R. Horner-Devine & Andrew T. Jessup Received: 7 December /Revised: 15 April /Accepted. Frontogenesis Defined Frontogenesis (in general terms) refers to the change in the magnitude and orientation of the temperature gradient at a level or in a layer (e.g., mb) due to directional and speed changes in the wind field.

Frontogenesis (in specific terms) refers to an increase in the horizontal thermal gradient with time. Sea surface temperature (SST) from weekly global advanced very high resolution radiometer data for the period of – and estimates of the surface forcing due to wind stress and net heat flux are used to investigate a global monthly climatology of large‐scale oceanic frontal zones (OFZs), the variability of SST gradient in several frontal zones, and the meridional frontogenesis in the Cited by: in Atmospheric Sciences presented on April 5, Title: FRONTS AND FRONTOGENESIS AS REVEALED BY HIGH TINE RESOLUTION DATA Upper air soundings taken every three hours are used to examine a cold front of average intensity over a period of 24 hours.

Vertical cross sections of potential tempera-ture and wind and horizontal analyses are compared and ad. The process of frontolysis must continue for some time in order to destroy an existing front. Frontogenesis is likely to occur when the wind blows in such a way that the isotherms become packed along the leading edge of the intruding air mass.

Convergence of the wind toward a point or contraction toward a line augments the process of frontogenesis. The warm air ahead of the fronts was nearly barotropic, while the cold air behind was baroclinic through deep layers.

A deep mixed layer was observed to grow in this cold air. View full-text. Frontogenesis generates vertical velocities of 𝒪(30 m d −1) and ageostrophic cross front flows of 3 to 5 cm s −1.

The subduction is achieved by the deep ageostrophic flow which carries water from the surface layer below and across the by: Frontogenesis is a meteorological process of tightening of horizontal temperature gradients to produce fronts.

In the end, two types of fronts form: cold fronts and warm fronts. A cold front is a narrow line where temperature decreases rapidly. A warm front is a narrow line of warmer temperatures and essentially where much of the precipitation occurs.

Frontogenesis occurs as a result of a developing. Simply explained, it’s the creation (genesis) of a boundary between airmasses (front).

It can be measured by the increase in the horizontal temperature gradient over a given area over time. An example is shown below. Low/mid level frontogenesis has the biggest impact on our weather, so that’s where we’ll be focusing here. eration of mesoscale gravity wave modes in a jet–front system.

The sensitivity studies suggest that it would re-quire grid resolution of 25km or less to adequately re-solve the properties of such gravity waves.

Rotunno et al. () investigated the dynamics of ULFs with a model of km resolution. The forcing was a baro.Frontogenesis, subduction, and cross-front exchange at upper ocean fronts subduction of parcels below and across the front.

Frontogenesis generates vertical velocities of 0(30 m d -•) and ageostrophic cross front flows of 3 to 5 cm s -•. high-resolution data sets which have been collected near these fronts (such as the Frontal Air.

This paper reports a diagnosis of the structure and dynamics of upper-level fronts (ULFs) simulated with a high-resolution Weather Research and Forecasting Model with diabatic heating versus one without diabatic by: 5.