Observed structure of the nocturnal urban boundary layer and its evolution into a convective mixed layer

Itsushi Uno, Shinji Wakamatsu, Hiromasa Ueda, Akira Nakamura

研究成果: Contribution to journalArticle査読

21 被引用数 (Scopus)

抄録

The turbulence properties of the nocturnal urban boundary layer (UBL) and its transition to the convective mixed layer have been observed over the urban center of Sapporo, Japan. The nocturnal UBL was characterized by an elevated inversion layer and a near-neutral mixed layer below it. The inversion layer varied with time and showed a wavy pattern. Kelvin-Helmholtz instability (billow) was observed within the elevated inversion layer, the horizontal and vertical scales of this billow being evaluated to be of the order of the vertical scale of the elevated inversion layer. The transition from the nocturnal UBL to the convective mixed layer occured rapidly, within 1-1.5 h over the center of the urban area. At this time, the downward transport of sensible heat below the inversion base became important. The normalized turbulence intensities in the convective mixed layer were also examined.

本文言語英語
ページ(範囲)45-57
ページ数13
ジャーナルAtmospheric Environment. Part B, Urban Atmosphere
26
1
DOI
出版ステータス出版済み - 3 1992
外部発表はい

All Science Journal Classification (ASJC) codes

  • 環境科学(全般)
  • 汚染
  • 工学(全般)
  • 地球惑星科学(全般)

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