Role of Large-Scale Circulation in Triggering Foehns in the Hokuriku District of Japan during Midsummer

Shibata, Yukiko; Kawamura, Ryuichi; Hatsushika, Hiroaki

doi:10.2151/jmsj.2010-304

Cited by 12 publications

(17 citation statements)

References 25 publications

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“…From the typhoon tracks, typhoons are observed to move westward or northwestward along the southern periphery of the anomalous high from day À2 to day 0. Thus, it appears that the locally enhanced high to the northeast of the typhoons can, in turn, play a significant role in inhibiting typhoons' northward migration and in facilitating their further westward movement at their developing stage, which is consistent with the results of Shibata et al [2010]. Figure 3 is the same as Figure 2 but for category OC.…”

Section: Relationship Between Typhoon Activity and North Pacific Subtsupporting

confidence: 60%

“…Thus, it appears that the locally enhanced high to the northeast of the typhoons can, in turn, play a significant role in inhibiting typhoons' northward migration and in facilitating their further westward movement at their developing stage, which is consistent with the results of Shibata et al . [].…”

Section: Relationship Between Typhoon Activity and North Pacific Subtmentioning

confidence: 99%

“…Li and Zhou [, ] also emphasized that the 30–60 day Madden‐Julian oscillation and the 10–20 day quasi‐biweekly oscillation (QBWO) modulate tropical cyclone activity over the western North Pacific Ocean. Another view is that the typhoon‐enhanced western ridge of the North Pacific subtropical high can, in turn, force a typhoon track to shift westward [ Shibata et al ., ].…”

Section: Introductionmentioning

confidence: 99%

“…It is known that tropical cyclones (typhoons) over the western North Pacific Ocean remotely and indirectly affect summer weather in East Asia by enhancing warm and moist advection from lower latitudes [e.g., Kawamura and Ogasawara, 2006;Yamada and Kawamura, 2007;Shibata et al, 2010;Yoshida and Itoh, 2012]. Since such a remote impact is intimately related to the occurrence of extremely heavy rainfall events in the vicinity of Japan [Murata, 2009;Wang et al, 2009] and the Korean Peninsula [Byun and Lee, 2012], further understanding of the remote effects of typhoons is needed.…”

Section: Introductionmentioning

confidence: 99%

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Scale interaction between typhoons and the North Pacific subtropical high and associated remote effects during the Baiu/Meiyu season

Hirata

Kawamura

2014

JGR Atmospheres

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The interaction between typhoons and the North Pacific subtropical high and the associated remote impact on East Asian and North Pacific anomalous weather during the Baiu/Meiyu season have been investigated using the Japanese long-term Reanalysis project data aided by the Japan Meteorological Agency Climate Data Assimilation System. The typhoons that appeared in July have been categorized into two primary tracks, the Hainan Island course (HC) and the Okinawa Island course (OC). A typhoon gives rise to negative absolute vorticity advection along its eastern periphery, which locally reinforces the western ridge of the North Pacific subtropical high, whereas the resultant anomalous high stimulates the westward (northward) migration of the HC (OC) typhoon through its combination with the background flow. A combined effect of the typhoon and its induced anomalous anticyclonic circulation increases the transportation of moisture into the Baiu/Meiyu frontal zone in the vicinity of Japan. Over the East China Sea and the Sea of Japan, northward or northeastward moisture flux is pronounced along the western periphery of the typhoon-induced anticyclonic circulation anomaly in the HC category, triggering heavy rainfall on central Japan's Sea of Japan coast. Similar remote effects also operate in the OC category, which is responsible for the occurrence of extremely heavy rainfall along the Pacific coast of western Japan. When an OC typhoon approaches the Asian jet, it is capable of giving rise to anticyclonic vorticity within the jet, leading to the downstream development of stationary Rossby wave packets via the North Pacific waveguide.

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Section: Relationship Between Typhoon Activity and North Pacific Subtsupporting

confidence: 60%

Section: Relationship Between Typhoon Activity and North Pacific Subtmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Scale interaction between typhoons and the North Pacific subtropical high and associated remote effects during the Baiu/Meiyu season

Hirata

Kawamura

2014

JGR Atmospheres

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“…One factor that makes the environment favorable for the appearance of extremely high temperatures is the foehn phenomenon (e.g., Ogura et al 2004;Shibata et al 2010). Physical parameters that control the occurrence of the foehn events have been investigated.…”

Section: Introductionmentioning

confidence: 99%

Summertime Temperature Extremes over Japan in the Late 21st Century Projected by a High-Resolution Regional Climate Model

Murata¹,

Nakano

Kanada

et al. 2012

Journal of the Meteorological Society of Japan

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Future changes in summertime temperature extremes over Japan are projected by a well-developed regional climate model (RCM) with a spatial resolution of 5 km. The performance of the RCM with respect to temperature in the present climate is evaluated first based on observations. Although the di¤erences in the biases (from observations) of daily temperatures between the RCM and the driving atmospheric general circulation model (AGCM) simulations are not statistically significant, root-mean-square errors (from observations) in daily mean and minimum temperatures reproduced by the RCM are smaller than those by the AGCM with a coarser spatial resolution. These results indicate that RCM with a higher spatial resolution has better performance than the driving AGCM in simulating temperature variability. A test of whether the RCM can capture temperature extremes reveals a good quantitative agreement between simulated and observed values in appearance frequency of extreme high temperature for the daily minimum temperature during July and August. The spatial pattern of the upper tail of the frequency distribution for the daily maximum temperature is also in good agreement with observations, although the model values are underestimated.Projected changes for extremely high daily minimum temperature are relatively large in July on the lee side of the Hidaka Mountains, southeast of Hokkaido. This finding can be explained by the foehn phenomenon: changes in the windward Froude number indicate that atmospheric conditions in the future climate are more favorable for the intensification of foehn. In terms of extremely high daily maximum temperature, the di¤erence between the present-day and future climates during August is relatively large over the Tama area, west of Tokyo. Although the foehn phenomenon is not solely responsible for the projected changes, the phenomenon can explain the projected changes when westerly winds prevail over the Tama area, located on the lee side of the Kanto Mountains.

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Japan's south foehn on the Toyama Plain: Dynamical or thermodynamical mechanisms?

Kusaka

Nishi

Kakinuma

et al. 2021

Intl Journal of Climatology

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Japanese society has recently taken a greater interest in foehn warming because it has caused record-breaking high temperatures and sudden damage to rice crops. This is the first comprehensive climatological study focused on Japan's south foehn, which blows across the Toyama Plain in the Hokuriku region. Climatological analyses, including an objective selforganizing map and subjective analysis of 198 south foehn cases, revealed that $68.2% of the foehns occurred while an extratropical cyclone was passing through the Sea of Japan. Approximately 19.7% of the remaining foehns blew while an anticyclone covered Japan. Only 5.1% of all foehns occurred during a typhoon, but very high temperatures occurred when typhoons were approaching. Foehns were observed in all seasons but tended to blow more often in spring, when there are many migratory anticyclones and cyclones.Most of the foehns begin at night and end or pause during the day. This is due to the removal of the nocturnal stable layer and the development of a local daytime pressure gradient on the lee side. The dynamical mechanism provides the primary explanation for Japan's south foehn. Surprisingly, the foehns with precipitation on windward mountains slopes accounted for only $19.2% of all cases, with $40.0% being typhoon cases. Most of these are likely of multiple type; a pure thermodynamical type of foehn is a rare occurrence. Numerical simulations and back trajectory analyses for 76 selected foehn cases revealed that the majority of the air parcels originated from the south and passed straight over the Hida Highlands, between two mountain ranges, as a hybrid type of gap and foehn winds.

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Role of Large-Scale Circulation in Triggering Foehns in the Hokuriku District of Japan during Midsummer

Cited by 12 publications

References 25 publications

Scale interaction between typhoons and the North Pacific subtropical high and associated remote effects during the Baiu/Meiyu season

Scale interaction between typhoons and the North Pacific subtropical high and associated remote effects during the Baiu/Meiyu season

Summertime Temperature Extremes over Japan in the Late 21st Century Projected by a High-Resolution Regional Climate Model

Japan's south foehn on the Toyama Plain: Dynamical or thermodynamical mechanisms?

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