The Atmospheric Budget of Angular Momentum

Tucker, G. B.

doi:10.3402/tellusa.v12i2.9385

Cited by 10 publications

(6 citation statements)

References 6 publications

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“…A comparison therefore only makes sense for the mid-latitudes as here kinetic energy of transient eddies dominates over that of standing eddies. Here Tucker (1960) estimates the zonal average of K syn to be roughly 70 m 2 s −1 at 400 mbar (see Table 6 of Tucker (1960)) which is in fair agreement with our estimate of ∼ 80 m 2 s −1 . Similarly, the values and vertical increase of zonally averaged u w given by Stone and Yao (1987) (their Fig.…”

Section: Discussionsupporting

confidence: 82%

“…To our knowledge, only few studies have published reliable estimates of them so far, notably Tucker (1960) for K syn , Lau et al (1978) for v v ag − u u ag and Stone and Yao (1987) for u w . Tucker (1960) and Stone and Yao (1987), unfortunately, used unfiltered data for their estimates hence including the effect of standing eddies as well. A comparison therefore only makes sense for the mid-latitudes as here kinetic energy of transient eddies dominates over that of standing eddies.…”

Section: Discussionmentioning

confidence: 99%

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Three-dimensional parameterizations of the synoptic scale kinetic energy and momentum flux in the Earth's atmosphere

Coumou

Petoukhov

Елисеев

2011

Nonlin. Processes Geophys.

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Abstract. We present a new set of statistical-dynamical equations (SDEs) which can accurately reproduce the threedimensional atmospheric fields of synoptic scale kinetic energy and momentum flux. The set of equations is closed by finding proper parameterizations for the vertical macroturbulent diffusion coefficient and ageostrophic terms. The equations have been implemented in a new SD atmosphere model, named Aeolus. We show that the synoptic scale kinetic energy and momentum fluxes generated by the model are in good agreement with empirical data, which were derived from bandpass-filtered ERA-40 data. In addition to present-day climate, the model is tested for substantially colder (last glacial maximum) and warmer (2×CO 2 ) climates, and shown to be in agreement with general circulation model (GCM) results. With the derived equations, one can efficiently study the position and strength of storm tracks under different climate scenarios with calculation time a fraction of those of GCMs. This work prepares ground for the development of a new generation of fast Earth System Models of Intermediate Complexity which are able to perform multimillennia simulations in a reasonable time frame while appropriately accounting for the climatic effect of storm tracks.

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Section: Discussionsupporting

confidence: 82%

Section: Discussionmentioning

confidence: 99%

Three-dimensional parameterizations of the synoptic scale kinetic energy and momentum flux in the Earth's atmosphere

Coumou

Petoukhov

Елисеев

2011

Nonlin. Processes Geophys.

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“…This torque is estimated for the CTL simulation using the surface pressure method of Wahr and Oort (1984): summing a value proportional to p s 3 0.5(H i11 2 H i21 ) over all grid boxes i along a circle of constant latitude, where p s is surface pressure and H is surface height. This gives values in quantitative agreement with observations from Tucker (1960) and Madden and Speth (1995) for the CTL simulation. Between 408 and 708N, where orography has the largest impact on U, the resolved orographic pressure torque is found to be an order of magnitude lower than that from the resolved wave forcing shown in Figs.…”

Section: A Zonal Mean Response To Orographysupporting

confidence: 89%

Revisiting the Role of Mountains in the Northern Hemisphere Winter Atmospheric Circulation

White

Wallace

Battisti

2021

Journal of the Atmospheric Sciences

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The impact of global orography on Northern Hemisphere wintertime climate is revisited using the Whole Atmosphere Community Climate Model, WACCM6. A suite of experiments explores the roles of both resolved orography, and the parameterized effects of unresolved orographic drag (hereafter parameterized orography), including gravity waves and boundary layer turbulence. Including orography reduces the extra-tropical tropospheric and stratospheric zonal mean zonal wind, , by up to 80%; this is substantially greater than previous estimates. Ultimately parameterized orography accounts for 60-80% of this reduction; however, away from the surface most of the forcing of by parameterized orography is accomplished by resolved planetary waves. We propose that a catalytic wave-mean-flow positive feedback in the stratosphere makes the stratospheric flow particularly sensitive to parameterized orography. Orography and land-sea contrast contribute approximately equally to the strength of the mid-latitude stationary waves in the free troposphere, although orography is the dominant cause of the strength of the Siberian high and Aleutian low at the surface, and of the position of the Icelandic low. We argue that precisely quantifying the role of orography on the observed stationary waves is an almost intractable problem, and in particular should not be approached with linear stationary wave models in which is prescribed. We show that orography has less impact on stationary waves, and therefore on , on a backwards rotating Earth. Lastly, we show that atmospheric meridional heat transport shows remarkable constancy across our simulations, despite vastly different climates and stationary wave strengths.

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“…to realistic circulations, whereas the work ofTucker [1960] in analyzing observed velocity values suggests numerical values of about 106 cm' set -x for K.. We find that values of about 109 for K,• and about 106 for K, lead to fairly realistic calculated meridional circulations. A mean value for (k•2) in (18) is calculated to be about 10 • cm sec øC units by dividing values of (u'v'), deduced by Tucker, by the meridional gradient of mean temperature.…”

mentioning

confidence: 69%

On the problem of formulating a realistic model of the general atmospheric circulation

Davies¹,

Oakes²

1962

J. Geophys. Res.

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Since the equations of global mean flow and mean temperature (averages taken over a period of a year, say) are very complex in form when expressed in spherical polar coordinates, a limited problem is first considered: given the mean temperature and density distributions, we attempt to solve the residual velocity distribution equations. The Reynolds stress component associated with the meridional flow of zonal velocity is a crucial factor, and, as a first approximation, it is taken to depend linearly on Ω, the earth's angular velocity, and on the meridional mean temperature gradient. A series solution for the velocity distribution is then obtained in terms of ascending powers of Ω, and the meridional component series is used to explore the crucial influence of the Reynolds stress components on the structure of the meridional cellular circulation.

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The Atmospheric Budget of Angular Momentum

Cited by 10 publications

References 6 publications

Three-dimensional parameterizations of the synoptic scale kinetic energy and momentum flux in the Earth's atmosphere

Three-dimensional parameterizations of the synoptic scale kinetic energy and momentum flux in the Earth's atmosphere

Revisiting the Role of Mountains in the Northern Hemisphere Winter Atmospheric Circulation

On the problem of formulating a realistic model of the general atmospheric circulation

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