The Diurnal Cycle of Clouds in Tropical Cyclones over the Western North Pacific Basin
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- Fukuda Kohei
- Department of Earth Science, Graduate School of Science and Engineering, University of Toyama
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- Yasunaga Kazuaki
- Department of Earth Science, Graduate School of Science and Engineering, University of Toyama
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- Oyama Ryo
- Forecast Division, Forecast Department, Japan Meteorological Agency (JMA) Meteorological Research Institute (MRI)
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- Wada Akiyoshi
- Meteorological Research Institute (MRI)
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- Hamada Atsushi
- Department of Earth Science, Graduate School of Science and Engineering, University of Toyama
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- Fudeyasu Hironori
- Yokohama National University
抄録
<p>This study examined the diurnal cycles of brightness temperature (TB) and upper-level horizontal winds associated with tropical cyclones (TCs) over the western North Pacific basin, making use of data retrieved from geostationary-satellite (Himawari-8) observations that exhibited unprecedented temporal and spatial resolutions. The results of a spectral analysis revealed that diurnal cycles prevail in TB variations over the outer regions of TCs (300-500 km from the storm center). The dominance of the diurnal cycle was also found in variations in the radial wind (Vr) in intensive TCs, although there was no dominant cycle in tangential wind variation. In addition, coherence spectra demonstrated that the diurnal cycles of TB and Vr are significantly coupled in intensive TCs. The migration speed of TB and Vr anomalies exceeded the time-mean Vr, and it was speculated that diurnal cycle signals propagate (i.e., are not advected) toward the outer regions of TCs.</p>
収録刊行物
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- SOLA
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SOLA 16 (0), 109-114, 2020
公益社団法人 日本気象学会
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詳細情報 詳細情報について
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- CRID
- 1390003825199840512
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- NII論文ID
- 130007868918
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- ISSN
- 13496476
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
- KAKEN
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- 抄録ライセンスフラグ
- 使用不可