抄録
The formation mechanism of the nocturnal urban boundary layer (UBL), especially in the winter nighttime, was investigated based on the extensive field observations conducted during November 1984 in Sapporo, Japan. A strong, elevated inversion formed over the Sapporo urban area and the inversion base height was approximately twice the average building height. Velocity fluctuations Σu, Σw and Reynolds stress {Mathematical expression} had nearly uniform profiles within the nocturnal UBL and decreased with height above the UBL. On the other hand, temperature fluctuations Σt, and heat fluxes {Mathematical expression} and {Mathematical expression} had peaks at the inversion base and small values within the nocturnal UBL. The turbulent kinetic energy budget showed that the turbulent transport term and shear generation from urban canopy elements are important in the nocturnal UBL development; the role of the buoyancy term is small. The turbulence data analysis and application of a simple advective model showed that the mechanism of UBL formation may be controlled by the downward transport of sensible heat from the elevated inversion caused by mechanically-generated turbulence.
| 元の言語 | 英語 |
|---|---|
| ページ（範囲） | 59-82 |
| ページ数 | 24 |
| ジャーナル | Boundary-Layer Meteorology |
| 巻 | 45 |
| 発行部数 | 1-2 |
| DOI | |
| 出版物ステータス | 出版済み - 10 1 1988 |
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All Science Journal Classification (ASJC) codes
- Atmospheric Science
これを引用
An observational study of the structure of the nocturnal urban boundary layer. / Uno, I.; Wakamatsu, S.; Ueda, H.; Nakamura, A.
：: Boundary-Layer Meteorology, 巻 45, 番号 1-2, 01.10.1988, p. 59-82.研究成果: ジャーナルへの寄稿 › 記事
}
TY - JOUR
T1 - An observational study of the structure of the nocturnal urban boundary layer
AU - Uno, I.
AU - Wakamatsu, S.
AU - Ueda, H.
AU - Nakamura, A.
PY - 1988/10/1
Y1 - 1988/10/1
N2 - The formation mechanism of the nocturnal urban boundary layer (UBL), especially in the winter nighttime, was investigated based on the extensive field observations conducted during November 1984 in Sapporo, Japan. A strong, elevated inversion formed over the Sapporo urban area and the inversion base height was approximately twice the average building height. Velocity fluctuations Σu, Σw and Reynolds stress {Mathematical expression} had nearly uniform profiles within the nocturnal UBL and decreased with height above the UBL. On the other hand, temperature fluctuations Σt, and heat fluxes {Mathematical expression} and {Mathematical expression} had peaks at the inversion base and small values within the nocturnal UBL. The turbulent kinetic energy budget showed that the turbulent transport term and shear generation from urban canopy elements are important in the nocturnal UBL development; the role of the buoyancy term is small. The turbulence data analysis and application of a simple advective model showed that the mechanism of UBL formation may be controlled by the downward transport of sensible heat from the elevated inversion caused by mechanically-generated turbulence.
AB - The formation mechanism of the nocturnal urban boundary layer (UBL), especially in the winter nighttime, was investigated based on the extensive field observations conducted during November 1984 in Sapporo, Japan. A strong, elevated inversion formed over the Sapporo urban area and the inversion base height was approximately twice the average building height. Velocity fluctuations Σu, Σw and Reynolds stress {Mathematical expression} had nearly uniform profiles within the nocturnal UBL and decreased with height above the UBL. On the other hand, temperature fluctuations Σt, and heat fluxes {Mathematical expression} and {Mathematical expression} had peaks at the inversion base and small values within the nocturnal UBL. The turbulent kinetic energy budget showed that the turbulent transport term and shear generation from urban canopy elements are important in the nocturnal UBL development; the role of the buoyancy term is small. The turbulence data analysis and application of a simple advective model showed that the mechanism of UBL formation may be controlled by the downward transport of sensible heat from the elevated inversion caused by mechanically-generated turbulence.
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U2 - 10.1007/BF00120815
DO - 10.1007/BF00120815
M3 - Article
AN - SCOPUS:0024228604
VL - 45
SP - 59
EP - 82
JO - Boundary-Layer Meteorology
JF - Boundary-Layer Meteorology
SN - 0006-8314
IS - 1-2
ER -