Observation of jumping cirrus with ground-based cameras, radiosonde, and himawari-8

Takafumi Seguchi, Suginori Iwasaki, Masashi Kamogawa, Tomoki Ushiyama, Hajime Okamoto

研究成果: ジャーナルへの寄稿記事

抄録

In the summer of 2016, 14 cases of jumping cirrus (JC) were observed around the Kanto region in Japan by ground-based, visible-light cameras. The cameras were set at the summit of Mt. Fuji and National Defense Academy (Kanagawa, Japan), and 15-second time-lapse photography was continually taken for the period. The location and spatial scale of the JC were calculated by measurements using the photometry of background stars in the nighttime and the geostationary meteorological satellite Himawari-8 infrared imagery. The environmental conditions of the JC were also investigated using radiosonde and Himawari-8 visible and infrared measurements. Comparing our cases to the JC in the United States of America (USA) reproduced by a three-dimensional, nonhydrostatic cloud model from previous studies, their motions, morphology, spatial and temporal scales showed similarities, although the horizontal scale of the JC and the magnitude of the underlying convection was relatively smaller in our cases. The sounding by the radiosonde in the vicinity of the storms showed that 3 of the 14 cases reached the stratosphere. However, the hydration of the lower stratosphere was not supported by analysis of the brightness temperature difference (BTD) between 6.2 and 10.4 µm measured by Himawari-8. The averaged wind shear across the range of the jumping heights above the anvil was −1.1 m s−1 km−1. The maximum value of the convective available potential energy (CAPE) of the 14 cases was 1384 J kg−1, which is several times smaller than those of the thunderstorm cases observed in the USA in previous numerical JC studies. This indicates that JC occurs from the cumulonimbus anvil top even if the convection is relatively weak. The motion of JC observed by visible-light cameras shows that it can transport moisture above the tops of the anvils of convective clouds regardless of its altitude as cloud ice appears to be sublimated.

元の言語英語
ページ(範囲)615-632
ページ数18
ジャーナルJournal of the Meteorological Society of Japan
97
発行部数3
DOI
出版物ステータス出版済み - 1 1 2019

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cirrus
radiosonde
stratosphere
convection
cumulonimbus
infrared imagery
convective cloud
wind shear
photography
thunderstorm
potential energy
hydration
brightness temperature
environmental conditions
moisture
ice
summer

All Science Journal Classification (ASJC) codes

  • Atmospheric Science

これを引用

Observation of jumping cirrus with ground-based cameras, radiosonde, and himawari-8. / Seguchi, Takafumi; Iwasaki, Suginori; Kamogawa, Masashi; Ushiyama, Tomoki; Okamoto, Hajime.

:: Journal of the Meteorological Society of Japan, 巻 97, 番号 3, 01.01.2019, p. 615-632.

研究成果: ジャーナルへの寄稿記事

Seguchi, Takafumi ; Iwasaki, Suginori ; Kamogawa, Masashi ; Ushiyama, Tomoki ; Okamoto, Hajime. / Observation of jumping cirrus with ground-based cameras, radiosonde, and himawari-8. :: Journal of the Meteorological Society of Japan. 2019 ; 巻 97, 番号 3. pp. 615-632.
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abstract = "In the summer of 2016, 14 cases of jumping cirrus (JC) were observed around the Kanto region in Japan by ground-based, visible-light cameras. The cameras were set at the summit of Mt. Fuji and National Defense Academy (Kanagawa, Japan), and 15-second time-lapse photography was continually taken for the period. The location and spatial scale of the JC were calculated by measurements using the photometry of background stars in the nighttime and the geostationary meteorological satellite Himawari-8 infrared imagery. The environmental conditions of the JC were also investigated using radiosonde and Himawari-8 visible and infrared measurements. Comparing our cases to the JC in the United States of America (USA) reproduced by a three-dimensional, nonhydrostatic cloud model from previous studies, their motions, morphology, spatial and temporal scales showed similarities, although the horizontal scale of the JC and the magnitude of the underlying convection was relatively smaller in our cases. The sounding by the radiosonde in the vicinity of the storms showed that 3 of the 14 cases reached the stratosphere. However, the hydration of the lower stratosphere was not supported by analysis of the brightness temperature difference (BTD) between 6.2 and 10.4 µm measured by Himawari-8. The averaged wind shear across the range of the jumping heights above the anvil was −1.1 m s−1 km−1. The maximum value of the convective available potential energy (CAPE) of the 14 cases was 1384 J kg−1, which is several times smaller than those of the thunderstorm cases observed in the USA in previous numerical JC studies. This indicates that JC occurs from the cumulonimbus anvil top even if the convection is relatively weak. The motion of JC observed by visible-light cameras shows that it can transport moisture above the tops of the anvils of convective clouds regardless of its altitude as cloud ice appears to be sublimated.",
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AU - Okamoto, Hajime

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N2 - In the summer of 2016, 14 cases of jumping cirrus (JC) were observed around the Kanto region in Japan by ground-based, visible-light cameras. The cameras were set at the summit of Mt. Fuji and National Defense Academy (Kanagawa, Japan), and 15-second time-lapse photography was continually taken for the period. The location and spatial scale of the JC were calculated by measurements using the photometry of background stars in the nighttime and the geostationary meteorological satellite Himawari-8 infrared imagery. The environmental conditions of the JC were also investigated using radiosonde and Himawari-8 visible and infrared measurements. Comparing our cases to the JC in the United States of America (USA) reproduced by a three-dimensional, nonhydrostatic cloud model from previous studies, their motions, morphology, spatial and temporal scales showed similarities, although the horizontal scale of the JC and the magnitude of the underlying convection was relatively smaller in our cases. The sounding by the radiosonde in the vicinity of the storms showed that 3 of the 14 cases reached the stratosphere. However, the hydration of the lower stratosphere was not supported by analysis of the brightness temperature difference (BTD) between 6.2 and 10.4 µm measured by Himawari-8. The averaged wind shear across the range of the jumping heights above the anvil was −1.1 m s−1 km−1. The maximum value of the convective available potential energy (CAPE) of the 14 cases was 1384 J kg−1, which is several times smaller than those of the thunderstorm cases observed in the USA in previous numerical JC studies. This indicates that JC occurs from the cumulonimbus anvil top even if the convection is relatively weak. The motion of JC observed by visible-light cameras shows that it can transport moisture above the tops of the anvils of convective clouds regardless of its altitude as cloud ice appears to be sublimated.

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