Relationships between the Quasi-Stationary Rossby Waves in the Subtropical Jet and the Mass and Heat Transport in the Northern Periphery of the Tibetan High

Terao, Toru

doi:10.2151/jmsj1965.77.6_1271

Cited by 7 publications

(4 citation statements)

References 38 publications

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“…Thus, the upper-tropospheric forcing may serve as an additional mechanism for the southeastward propagation of the low-level temperature perturbation. From a quasi-stationary Rossby wave points of view, the horizontal and vertical structures of the dominant ISO mode in this study are similar to those found in a case study by Terao (1998Terao ( , 1999 and the "silk road pattern, " a dominant mode of interannual variability (Kosaka, 2011;Kosaka et al, 2011) of the quasi-stationary Rossby waves over the Eurasian Continent in the boreal summer. The wave activity flux convergence also suggests that the upper tropospheric Rossby wave packets are the origin of the eastward-propagating ISO mode.…”

Section: Conclusion and Discussionsupporting

confidence: 85%

Intraseasonal Variability of Air Temperature Over East Asia in Boreal Summer

Zhao

Yao

et al. 2017

Front. Earth Sci.

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The intraseasonal oscillation (ISO) of atmospheric temperature at 2 m over East Asia (EA) in boreal summer is investigated through NCEP-NCAR reanalysis data for the period of 1979-2013. It is found that the surface air temperature in EA propagates on a 10-30-day time scale and exhibits a southeastward propagation characteristic. The average zonal and meridional phase speed of the intraseasonal air temperature anomaly is about 2.6 • longitude and 1.7 • latitude per day, respectively. The advection by the mean wind and the advection of the summer mean temperature by the intraseasonal wind primarily contribute to the propagation of the intraseasonal temperature perturbation through the diagnosis of the temperature budget. An upper-tropospheric geopotential positive (negative) height anomaly is closely associated with a low-level warmer (cooler) air temperature anomaly and both anomalies propagate southeastward in a similar way. A wave activity flux analysis reveals that mid-latitude Rossby wave energy also propagates southeastward, consistent with the upper-tropospheric geopotential height propagation. This indicates that in addition to low-level advection mechanism, upper-tropospheric forcing through the hydrostatic relationship is another possible mechanism. A further statistical analysis indicates that heat waves in EA summer are modulated by the southeastward-propagating intraseasonal temperature mode.

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Section: Conclusion and Discussionsupporting

confidence: 85%

Intraseasonal Variability of Air Temperature Over East Asia in Boreal Summer

Zhao

Yao

et al. 2017

Front. Earth Sci.

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“…This high greatly influences the summer climate in East Asia including Japan [4,5,32]. At 150 hPa in the tropopause, we find the center of the Tibetan High (Figure 3a,d) which is a warm, gigantic, anti-cyclonic circulation that covers East Asia from the upper troposphere to the lower stratosphere [12][13][14][15]. The Tibetan High extends to the west of India and can be explained as a Rossby wave response to the heating over India [33,34].…”

Section: North Pacific Subtropical High and Tibetan Highmentioning

confidence: 88%

“…Recently, there has been discussion that the Tibetan High is an important factor in determining summer climate in Japan. This high is a warm, gigantic, anti-cyclonic circula-tion and covers East Asia from the upper troposphere to the lower stratosphere [12][13][14], and greatly influences the summer climate in East Asia [15]. This is characterized by a high-pressure system over the Tibetan Plateau, which is also called the South Asian High [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Effects of the Tibetan High and the North Pacific High on the Occurrence of Hot or Cool Summers in Japan

et al. 2021

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In this study, we investigated the effects of the Tibetan High near the tropopause and the North Pacific High in the troposphere on occurrences of hot or cool summers in Japan. We first classified Japan into six regions and identified hot and cool summer years in these regions from a 38-year sample (1980–2017) based on the monthly air temperature. To investigate the features of circulation fields over Asia during hot and cool summers in Japan, we calculated the composite differences (hot summer years minus cool summer years) of several variables such as geopotential height, which indicated significant high-pressure anomalies in the troposphere and lower stratosphere. These results suggest that both the North Pacific and the Tibetan Highs tend to extend to Japan during hot summer years, while cool summers seem to be associated with the weakening of these highs. We found that extension of the Tibetan High to the Japanese mainland can lead to hot summers in Northern, Eastern, and Western Japan. On the other hand, hot summers in the Southwestern Islands may be due to extension of the Tibetan High to the south. Similarly, the latitudinal direction of extension of the North Pacific High is profoundly connected with the summer climate in respective regions.

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“…Chen indicated that stratospheretroposphere exchange associated with Asian and Mexican monsoons is a two-way process, with tracers entering the extratropical stratosphere and vice versa. Moreover, studies have examined stratosphere-troposphere exchange of mass or water vapor through interaction with mid-latitude synoptic disturbances and with the Tibetan High (e.g., Dethof et al 1999;Terao 1999). Thus some studies of stratosphere-troposphere coupling have focused on the transport of mass or constituents, as well as dynamical processes.…”

Section: Introductionmentioning

confidence: 99%

Connection between the Asian Summer Monsoon and Stratosphere-Troposphere Circulation over the Asian Region

Inoue

Takahashi

2009

Journal of the Meteorological Society of Japan

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We examined the connection between the Asian summer monsoon and stratosphere-troposphere circulation over the Asian region during a 25-year period in boreal summer (June-August) using NCEP/ NCAR reanalysis data. Strong monsoon years (6 years) were extracted from the 25-year sample using the monsoon index of Webster and Yang (1992), and composite maps of selected variables were created.Analyses revealed significant positive geopotential height anomalies over Japan and over Iran around 100 hPa in strong monsoon years. Both stretching and horizontal advection terms were dominant in the vorticity budget of high pressure anomalies over Japan, whereas only horizontal advection term was dominant over Iran. Wave activity flux was calculated for the strong monsoon years. Upward wave fluxes occurred over the Aral Sea and over Mongolia, in association with precipitation in northern India and in the Philippines. These correspondences are likely to show the Rossby wave response to diabatic heating in the Asian monsoon regions. Energy conversion was estimated in both East Asia and Central Asia using an equation for the rate of change of perturbation total energy. In East Asia, barotropic energy conversion was positive in the low-latitude lower troposphere. In midlatitudes, baroclinic energy conversion was positive in the troposphere. These results correspond to northward wave fluxes in the tropical lower troposphere and upward wave fluxes in mid-latitudes. In Central Asia, barotropic energy conversion was more dominant than baroclinic energy conversion in mid-latitudes. Upward fluxes occur in mid-latitudes, whereas northward fluxes do not occur in the tropics, unlike in East Asia. The estimation of the total wavenumber of stationary Rossby waves indicates that precipitation in the Philippines is strongly connected with high pressure anomalies over Japan through internal Rossby waves. In contrast, high pressure anomalies over Iran do not seem to be deeply related to precipitation in India.These results suggest that lower stratospheric high pressure anomalies over Japan are connected with both Rossby waves generated through precipitation in the Philippines and baroclinic energy conversion over Mongolia, whereas high pressure anomalies over Iran are controlled profoundly by internal dynamical processes near the Aral Sea.

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Relationships between the Quasi-Stationary Rossby Waves in the Subtropical Jet and the Mass and Heat Transport in the Northern Periphery of the Tibetan High

Cited by 7 publications

References 38 publications

Intraseasonal Variability of Air Temperature Over East Asia in Boreal Summer

Intraseasonal Variability of Air Temperature Over East Asia in Boreal Summer

Effects of the Tibetan High and the North Pacific High on the Occurrence of Hot or Cool Summers in Japan

Connection between the Asian Summer Monsoon and Stratosphere-Troposphere Circulation over the Asian Region

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