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

Itsushi Uno; Shinji Wakamatsu; Hiromasa Ueda; Akira Nakamura

doi:10.1016/0957-1272(92)90036-R

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

Itsushi Uno, Shinji Wakamatsu, Hiromasa Ueda, Akira Nakamura

Research output: Contribution to journal › Article › peer-review

20 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	45-57
Number of pages	13
Journal	Atmospheric Environment. Part B, Urban Atmosphere
Volume	26
Issue number	1
DOIs	https://doi.org/10.1016/0957-1272(92)90036-R
Publication status	Published - Mar 1992
Externally published	Yes

All Science Journal Classification (ASJC) codes

Environmental Science(all)
Pollution
Engineering(all)
Earth and Planetary Sciences(all)

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10.1016/0957-1272(92)90036-R

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title = "Observed structure of the nocturnal urban boundary layer and its evolution into a convective mixed layer",

abstract = "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.",

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AU - Wakamatsu, Shinji

AU - Ueda, Hiromasa

AU - Nakamura, Akira

PY - 1992/3

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N2 - 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.

AB - 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.

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