Medium-Scale Travelling Waves in the Extra-Tropical Upper Troposphere

Sato, K.; Eito, Hisaki; Hirota, Isamu

doi:10.2151/jmsj1965.71.4_427

Cited by 20 publications

(32 citation statements)

References 7 publications

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“…In this analysis, we have shown the existence of the medium-scale, eastward-travelling wave over the north Atlantic area, the dynamical character of which is almost the same as that obtained by Sato et al (1993). Therefore we can say that the mediumscale wave is not a peculiar phenomenon limited to the east Asia area but a ubiquitous one in the region where the mid-latitude tropospheric jet stream is intense.…”

Section: Discussionsupporting

confidence: 79%

“…In our previous study (Sato, Eito and Hirota, 1993: hereafter referred to as SEH), we found distinct medium-scale, eastward-traveling waves in the mid-latitude upper troposphere, by using both MU radar wind data and the Japan Spectral Model (JSM) data. The waves appear in a latitude band of 30-40-N in the eastern Asia and western Pacific region in springtime, with a tonal wavelength and wave period of about 2100 km and 26 h, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…An analysis is made, with the aid of ECMWF operational data, of medium-scale, eastward-traveling waves in the mid-latitude upper troposphere over the north Atlantic area as a counterpart of the similar analysis of Sato et al (1993) for the medium-scale waves over Japan.…”

Section: Introductionmentioning

confidence: 99%

“…

AbstractAn analysis is made, with the aid of ECMWF operational data, of medium-scale, eastward-traveling waves in the mid-latitude upper troposphere over the north Atlantic area as a counterpart of the similar analysis of Sato et al (1993) for the medium-scale waves over Japan.It is shown that the waves dominate in wintertime (January and February of 1990) over the north Atlantic centered around 50N, with the typical wavelength of 2400km, a period of 33 hours, and hence an eastward phase velocity of about 20 m s-1.

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mentioning

confidence: 99%

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Medium-Scale Travelling Waves over the North Atlantic

Hirota

Yamada

Sato

1995

Journal of the Meteorological Society of Japan

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An analysis is made, with the aid of ECMWF operational data, of medium-scale, eastward-traveling waves in the mid-latitude upper troposphere over the north Atlantic area as a counterpart of the similar analysis of Sato et al. (1993) for the medium-scale waves over Japan.It is shown that the waves dominate in wintertime (January and February of 1990) over the north Atlantic centered around 50N, with the typical wavelength of 2400km, a period of 33 hours, and hence an eastward phase velocity of about 20 m s-1.

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Section: Discussionsupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…

…”

mentioning

confidence: 99%

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Medium-Scale Travelling Waves over the North Atlantic

Hirota

Yamada

Sato

1995

Journal of the Meteorological Society of Japan

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“…The DEEs are di¤erent from the medium-scale waves that develop in the upper troposphere (Sato et al 1993; see also Section 4.3): the zonal wavelength (@1500 km: double the horizontal scale of an eddy) and the zonal wave velocity (10-15 m s À1 ) of DEEs are smaller than those of medium-scale waves (2000-3000 km and 25 m s À1 , respectively). In addition, the DEEs are confined to the lower troposphere.…”

Section: June 2010mentioning

confidence: 97%

Diurnal Variations in Lower-Tropospheric Wind over Japan Part II: Analysis of Japan Meteorological Agency Mesoscale Analysis Data and Four Global Reanalysis Data Sets

Sakazaki

Fujiwara

2010

Journal of the Meteorological Society of Japan

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Following on from the observation results obtained from Wind profiler Network and Data Acquisition System (WINDAS) data, as reported by Part I of this study, the dynamical processes responsible for the diurnal component in lower-tropospheric winds are examined using Japan Meteorological Agency (JMA) mesoscale analysis data (MANAL) and four global reanalysis data sets (JRA25/JCDAS, ERA-Interim, NCEP1, and NCEP2). Of these data sets, MANAL and JRA25 perform best in reproducing the WINDAS horizontal wind observations, including their diurnal and semidiurnal components. At 1-3 km height, Diurnal Eastward-moving Eddies (DEEs) with a phase speed of 10-15 m s À1 and diameter of @700 km move eastward over the Sea of Japan and over the Pacific throughout the year. The superposition of winds associated with DEEs over return currents controls the diurnal wind component over the main Japanese islands, generating diurnal amplitude maxima in spring and autumn at this height range. Analysis of global reanalysis data confirmed that the diurnal wind at 3-5 km in winter-spring is controlled mainly by medium-scale eastward-traveling waves with amplitude maxima around the tropopause. The diurnal wind at 3-5 km in summer-autumn is caused primarily by the diurnal tide with zonal wavenumbers of a10. For stations located on small islands south of the Japanese mainland, the diurnal wind is controlled mainly by the diurnal tide for the entire lower troposphere throughout the year.

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Influence of the solar cycle on the Polar‐night Jet Oscillation in the Southern Hemisphere

Kuroda¹,

Deushi²

2016

JGR Atmospheres

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The Polar‐night Jet Oscillation (PJO) is the dominant mode of stratospheric variability in the Southern Hemisphere and persists from midwinter to spring. The influence of the 11 year solar cycle on modulation of the PJO from late winter to spring is examined using observations and three 42 year simulations from a chemistry‐climate model. The only variation applied to model boundary conditions was the strength of ultraviolet (UV) radiation. This is set at 2 times larger than observations to enhance the strength of the solar signal. Simulations show a downward propagation of the stratospheric signal into the troposphere from late winter to spring, which tends to be enhanced as UV strength increases. This result is similar to observations but with a 1–2 month lag. The behavior of the PJO with respect to wave‐mean flow interactions is examined using a newly developed momentum budget analysis as well as wave energy analysis. We suggest that UV modulation of the interactions between planetary waves and zonal‐mean flow in the stratosphere, rather than direct diabatic processes as suggested in a previous study, is the source of solar cycle modulation of the PJO.

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Medium-Scale Travelling Waves in the Extra-Tropical Upper Troposphere

Cited by 20 publications

References 7 publications

Medium-Scale Travelling Waves over the North Atlantic

Medium-Scale Travelling Waves over the North Atlantic

Diurnal Variations in Lower-Tropospheric Wind over Japan Part II: Analysis of Japan Meteorological Agency Mesoscale Analysis Data and Four Global Reanalysis Data Sets

Influence of the solar cycle on the Polar‐night Jet Oscillation in the Southern Hemisphere

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