On the Propagation of Frequencies and Energy in Certain Types of Oceanic and Atmospheric Waves

Rossby, C.‐G.

doi:10.1175/1520-0469(1945)002<0187:otpofa>2.0.co;2

Cited by 152 publications

(76 citation statements)

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“…Et la vitesse de groupe est souvent plus importante que la vitesse de phase. La propagation zonale de l'énergie et de la fréquence de l'onde à la vitesse de groupe est un phénomène marquant qui est maintenant souvent mis en évidence et est montré pour la première fois très clairement dans le célèbre diagramme de Hovmöller (1949) suite à sa formulation par Rossby (1945a).…”

Section: Les Années Mitunclassified

Carl-Gustaf Rossby : son temps, sa personnalité, ses actions

Phillips¹

2007

Météorologie

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Section: Les Années Mitunclassified

Carl-Gustaf Rossby : son temps, sa personnalité, ses actions

Phillips¹

2007

Météorologie

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“…This speed obviously determined the size of the area over which initial conditions must be known. Rossby (1945Rossby ( , 1949aRossby ( , 1949b unified what would seemed to have been two contrasting problems: 'What is the effect of a point source on the entire range of longitude? And what is the effect of the entire range of longitude on a single forecast point?'…”

Section: Downstream Development and The Hovmöller Diagrammentioning

confidence: 99%

Early operational Numerical Weather Prediction outside the USA: an historical Introduction. Part 1: Internationalism and engineering NWP in Sweden, 1952–69

Persson

2005

Meteorological Applications

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“…Synoptic-scale Rossby waves are manifest in the tropopause-level flow as a succession of troughs and ridges (Rossby 1945). They play a vital role in the formation of midlatitude weather.…”

Section: Introductionmentioning

confidence: 99%

An Object-Based Forecast Verification Tool for Synoptic-Scale Rossby Waveguides

Giannakaki

Martius

2016

Weather and Forecasting

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An accurate representation of synoptic-scale Rossby waves in numerical weather forecast models is very important as these waves are closely linked to weather formation at the surface. Enhanced potential vorticity (PV) gradients at the tropopause levels act as waveguides for synoptic-scale Rossby waves, so spatial errors in the waveguides imply errors in the amplification and propagation of Rossby waves. This paper focuses on evaluating the forecast representation of these waveguides and presents an object-based forecast verification tool. In both forecast and the verification data, Rossby waveguide objects are defined based on enhanced PV gradient fields on isentropic surfaces. The tool automatically pairs the complex objects, compares their properties, and assesses the number of objects without a matching partner in either the forecast or the reanalysis. In the last step, error measures are calculated for the area and the location of the objects. As proofof-concept application of the method for the year 2008, five lead times of the Integrated Forecast System (IFS) from the ECMWF are compared with the ECMWF reanalysis dataset. The majority of the waveguide objects are found to be in the correct position, and there are no systematic positional errors; however, the forecast objects and hence the areas of enhanced PV gradients are smaller.

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On the Propagation of Frequencies and Energy in Certain Types of Oceanic and Atmospheric Waves

Cited by 152 publications

References 0 publications

Carl-Gustaf Rossby : son temps, sa personnalité, ses actions

Carl-Gustaf Rossby : son temps, sa personnalité, ses actions

Early operational Numerical Weather Prediction outside the USA: an historical Introduction. Part 1: Internationalism and engineering NWP in Sweden, 1952–69

An Object-Based Forecast Verification Tool for Synoptic-Scale Rossby Waveguides

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