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Tuesday, July 21, 2020 | History

2 edition of Spectral aspects of the stratospheric circulation during the IGY found in the catalog.

Spectral aspects of the stratospheric circulation during the IGY

Sidney Teweles

Spectral aspects of the stratospheric circulation during the IGY

by Sidney Teweles

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  • 22 Currently reading

Published by Massachusetts Institute of Technology, Dept. of Meteorology, Planetary Circulations Project in Cambridge, Mass .
Written in English

    Places:
  • Northern Hemisphere.
    • Subjects:
    • Stratospheric circulation -- Northern Hemisphere.,
    • Fourier analysis.,
    • Dynamic meteorology.

    • Edition Notes

      Statementby Sidney Teweles.
      SeriesReport / Massachusetts Institute of Technology, Dept. of Meteorology, Planetary Circulations Project ;, no. 8, Report (Massachusetts Institute of Technology. Planetary Circulations Project) ;, no. 8.
      Classifications
      LC ClassificationsQC851 .M134 no. 8, QC881.2.S8 .M134 no. 8
      The Physical Object
      Paginationxi, 191 p. :
      Number of Pages191
      ID Numbers
      Open LibraryOL1950953M
      LC Control Number90176879

        It is found in Figs. 12a and 12b that the acceleration due to the residual-mean meridional circulation is largest during the transition to westward winds (up to m s −1 day −1 at 10 hPa and ~ m s −1 day −1 at 20 hPa), and always acts to offset the strong westward forcing by convective GWs. During the transition to eastward winds. A key development in the history of atmospheric ozone research was the International Geophysical Year (IGY) in In preparation for the IGY, the British Antarctic Survey station at Halley Bay was set up. This station would later become important for its long series of measurements leading up to the discovery of the Antarctic ozone hole.

      Unfortunately, this book can't be printed from the OpenBook. If you need to print pages from this book, we recommend downloading it as a PDF. Visit to get more information about this book, to buy it in print, or to download it as a free PDF. R. Grotjahn, in Encyclopedia of Atmospheric Sciences (Second Edition), Temperature. In the troposphere and lower stratosphere, absorption and emission of radiation alter the air temperature at a rate of a few degrees per day. This change of air temperature is generally small compared to the difference between the equatorial regions and the polar regions.

        () Simulating planetary wave propagation to the upper atmosphere during stratospheric warming events at different mountain wave scenarios. Advances in Space Research , () Energy Spectra and Inertia–Gravity Waves in Global Analyses. ERA‐Interim is the latest global atmospheric reanalysis produced by the European Centre for Medium‐Range Weather Forecasts (ECMWF). The ERA‐Interim project was conducted in .


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Spectral aspects of the stratospheric circulation during the IGY by Sidney Teweles Download PDF EPUB FB2

In this study the horizontal component of the meridional circulation at the50 and 30 mb levels in the stratosphere is computed for the IGY period July through June Radiosonde data from approximately stations, well distributed over the northern hemisphere, are used in the analysis of the north-south component of the by: 6.

Abstract. Stratospheric circulation - seasonal variations, kinetic energy budget, wave number analysis, and zone floAuthor: S. Teweles. The mean energy flow in the lower stratosphere and in the troposphere are analyzed and compared with each other, indicating very clearly the baroclinical activness of the troposphere and the passiveness of the lower stratosphere.

The dynamics in the lower stratosphere are discussed. the mean meridional circulation is also by: Atmospheric waves drive stratospheric circulations such as the quasi-biennial and the semiannual oscillations in the tropical stratosphere (Holton and Lindzen ; Dunkerton and Baldwin ; Manzini et al.

) and the Brewer–Dobson circulation [Cohen et al. (), and references therein].The waves transport momentum upward, away from their tropospheric sources, and accelerate the mean Cited by: 2.

The present study describes the analysis of a sudden warming which developed spontaneously during one winter of a month simulation using a three-dimensional, spectral, quasi-geostrophic model. The changes that occurred in the circulation and thermal structure of the winter polar stratosphere during the warming are shown to be in close.

1 Introduction. Sudden stratospheric warmings (SSWs) are marked by a sharp temperature increase of several tens of kelvins in the middle to upper stratosphere (30–50 km) over the course of several days (Butler et al., ).Warmings are commonly classified as “minor” when the zonal‐mean 10‐hPa meridional temperature gradient between 60°N and 90°N reverses, and as.

Brewer-Dobson Circulation and Stratosphere–Troposphere. trend was observed during the second period of – From the spectral analysis, the periodicity cycles of LST time series. Abstract Dynamics of stratospheric vacillations, which were first obtained by Holton and Mass in a highly truncated spectral model, are investigated with an EP flux diagnosis based on the transform.

The wavenumber-frequency spectra of the meridional flux of angular momentum at 20°, 30°, 40°, 50°, 60° and 70°S, at mb, show a definite domain of wave interactions between the zonal and meridional components of the velocity at various latitudes.

In middle latitudes, the spectral band of the meridional flux of angular momentum is oriented from a region of low wavenumbers and low. Abstract. A review of the limited knowledge of the large-scale general circulation of the atmosphere above the mesopause is attempted and some specific suggestions are.

Barnes jr.,Kinetic and Potential Energy between mb and 10 mb during the first six months of the IGY, paper in Studies of the Stratospheric Circulation, Final Rep., Contract No.

AF19(), Planetary Circulations Project, Dept. of Meteor., Mass. Inst. of Techn. (), 8. 1 Introduction. The Brewer‐Dobson circulation (BDC) is a major feature of the Earth's climate system, consisting of the slow overturning motion of the stratosphere, with ascent in the tropics and descent in the extratropics [Holton et al., ; Randel and Jensen, ; Butchart, ].This airflow determines the meridional thermal structure of the stratosphere and impacts the transport and.

During winters when the stratospheric westerlies are enhanced, the NAO tends to be in its positive phase. There is a considerable body of evidence to support the notion that variability in the troposphere can drive variability in the stratosphere, but it also appears that some stratospheric control of the troposphere may also occur.

Spectral Aspects of the Stratospheric Circulation during the IGY Winter circulation has two aspects: (1) warm, barotropic, anticyclonic flow associated with a strengthening and extension of. 1. Introduction [2] During magnetically quiet periods, a daily record of the geomagnetic field on the ground usually shows a regular variation that is primarily composed of 24‐, 12‐, 8‐, and 6‐hour spectral components.

The regular daily variation of the geomagnetic field for each day is called solar regular (S R) variation [Mayaud, ] while the S R variation averaged over a certain. The extreme disruptions of the wintertime stratospheric circulation during sudden stratospheric warmings (SSW) have large effects on tracer concentrations through alterations in transport.

The major stratospheric warming event is evident in September. In addition, during the stratospheric warming period, the model mean temperature shows cooling at mesospheric heights. Figure 3 shows the wavelet power spectrum of the TIMEGCM temperature perturbation at zonal wavenumber 1 near °S latitude.

Peak amplitude at a period of 4‐day. This circulation transports tropical air with tropospheric qualities into the stratosphere, and at higher latitudes, transports air with stratospheric qualities back into the troposphere.

The classic paper describing this is by A. Brewer, and the circulation, known now as the Brewer–Dobson circulation, is shown in Figure 2. Circulation changes in the stratosphere during the dynamically active seasons, such as those described in sectioncan impact on the underlying troposphere via stratosphere‐troposphere dynamical coupling (see, e.g., Gerber et al.

for an overview). During this period of reduced PW activity, enhancement in gravity wave activity is observed during and is not observed during and the mean meridional winds change to more.

Brewer, A, Evidence for a world circulation provided by the measurements of helium and water vapor distributions in the stratosphere. Quart J Roy Met Soc, 75, Briffa, K, Annual climate variability in the holocene: Interpreting the message of ancient trees.In the context of lower stratospheric dynamics, two aspects of the model results shown in Fig.

2 stand out. First, the strongest residual circulation (in the lower stratosphere) is obtained with the HS94 setup that does not have a polar vortex.The mean meridional circulation is computed for the northern hemisphere winter. The equatorward current in the low troposphere has a strength of l-3 mps near 10 to 15 deg lat, and the return.