An Orographic Effect on the Cloud Distribution Around the Central Japan Under the Winter Monsoon Situation

Nishina, Junji

doi:10.4157/grj1984a.57.5_329

Cited by 2 publications

(3 citation statements)

References 10 publications

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“…The daytime surface wind speed also increased during the frost days, confirming active local circulation during fair weather under a high-pressure system. The pressure pattern of the winter monsoon (west high pressure and east low pressure) sometimes causes cloud bands on the Pacific side due to low-level wind convergence behind the central mountain ranges (Nishina, 1984). Evidence gathered in the surface meteorological parameters and weather maps suggests that the prevailing cloudy weather with warmer and moist air intrusion associated with synoptic disturbance is a primary factor in suppressing the development of needle ice during nighttime.…”

Section: Synoptic Weather Conditions Caused Needle Ice Formationmentioning

confidence: 99%

Effects of deforestation and weather on diurnal frost heave processes on the steep mountain slopes in south central Japan

Ueno

Kurobe²,

Imaizumi

et al. 2015

Earth Surf Processes Landf

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Freezing and thawing processes play an important role for the gravitational transport of surface materials on steep mountain slopes in Japan. The effects of deforestation on frost heave activity were observed through the 2012/2013 winter season in Ikawa University Forest, a southern mountainous area in central Japan (1180–1310 m above sea level). During periods without snow cover, needle ice development prevailed at a clear‐cut site, and the downslope sediment movement of upper soil was 10 to 15 cm through the winter season. At a non‐cut site, rise and fall in the ground surface level prevailed on a weekly scale, with no evident downslope movements at the surface; ice lens formation in the soil layer is assumed. Abrupt changes in the radiation budget, such as the strengthening of nighttime radiative cooling and increases in daytime direct insolation, induced frequent development/deformation of needle ice at the clear‐cut site. In snow‐free periods, the day‐to‐day variability in needle ice growth length and in nighttime averaged net radiation showed significant correlations; cloudy weather with warmer and moist air intrusion associated with synoptic disturbances prevented the occurrence of needle ice. Namely, day‐to‐day weather changes directly affected the mass movement of the upper soil after deforestation. Shallow snow cover occurred discontinuously through the winter and is likely an important factor in keeping the soil moisture sufficiently high in the upper soil layer for initiating needle ice during snow‐free periods. We also discuss contributions of coastal extratropical cyclone activities providing both snow cover and cloudy weather in the southern mountain areas of central Japan to the intra‐seasonal variability in frost heave and its indirect effect on soil creep and landslides on the deforested steep slopes. Copyright © 2015 John Wiley & Sons, Ltd.

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Section: Synoptic Weather Conditions Caused Needle Ice Formationmentioning

confidence: 99%

Effects of deforestation and weather on diurnal frost heave processes on the steep mountain slopes in south central Japan

Ueno

Kurobe²,

Imaizumi

et al. 2015

Earth Surf Processes Landf

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“…The position of the convergence line in the lee of the Chubu Mountains should depend on the synoptic wind speed and direction (Kawamura 1966;Nishina 1984). Figure 4 is a scatter diagram of the wind velocity at 850 hPa observed at 09 JST or 21 JST from November through March from 1996 to 2000.…”

Section: Discussionmentioning

confidence: 99%

“…These two wind systems converge over the Pacific Ocean or the Kanto Plain which is located in the lee of the Chubu Mountains. The convergence lines appearing over the Kanto Plain were investigated in previous studies (Kawamura 1966;Nishina 1984). Kawamura (1966) investigated in situ observation wind data and reported that the convergence line called the "Boso Front" appears over the Kanto Plain.…”

Section: Introductionmentioning

confidence: 99%

Precipitable Water Vapor around Orographically Induced Convergence Line

Kawase

Takeuchi

Sato

et al. 2006

SOLA

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During the winter monsoon, a convergence line called the Boso Front often appears in the area between the Kanto Plain and the Izu Islands, Japan. Two typical cases of high-level Precipitable Water Vapor (PWV) are observed along the convergence line in the lee of Chubu Mountains by the aid of latest techniques of Global Positioning System (GPS).Statistic analysis of GPS derived Precipitable Water Vapor (GPS-PWV) indicates that the prevailing wind direction controls the position of the high-level PWV in the lee of Chubu Mountains. A numerical model simulates the behavior of water vapor, namely, the temporal variation of simulated PWV and surface wind, which suggest the reasons for the high PWV near the convergence line. The convergence of surface wind gathers moisture, and trapped moisture by reduced wind velocity may also contribute the high-level PWV.

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An Orographic Effect on the Cloud Distribution Around the Central Japan Under the Winter Monsoon Situation

Cited by 2 publications

References 10 publications

Effects of deforestation and weather on diurnal frost heave processes on the steep mountain slopes in south central Japan

Effects of deforestation and weather on diurnal frost heave processes on the steep mountain slopes in south central Japan

Precipitable Water Vapor around Orographically Induced Convergence Line

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