Abstract
The atmospheric stable boundary layer (SBL) with a low-level jet is simulated experimentally using a thermally stratified wind tunnel. The turbulence structure and flow characteristics are investigated by simultaneous measurements of velocity and temperature fluctuations and by flow visualization. Attention is focused on the effect of strong wind shear due to a low-level jet on stratified boundary layers with strong stability. Occasional bursting of turbulence in the lower portion of the boundary layer can be found in the SBL with strong stability. This bursting originates aloft away from the surface and transports fluid with relatively low velocity and temperature upward and fluid with relatively high velocity and temperature downward. Furthermore, the relationship between the occurrence of turbulence bursting and the local gradient Richardson number (Ri) is investigated. The Ri becomes larger than the critical Ri, Ricr = 0.25, in quiescent periods. On the other hand, the Ri number becomes smaller than Ricr during bursting events.
| Original language | English |
|---|---|
| Pages (from-to) | 349-363 |
| Number of pages | 15 |
| Journal | Boundary-Layer Meteorology |
| Volume | 126 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - Mar 1 2008 |
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All Science Journal Classification (ASJC) codes
- Atmospheric Science
Cite this
Intermittent bursting of turbulence in a stable boundary layer with low-level jet. / Ohya, Yuji; Nakamura, Reina; Uchida, Takanori.
In: Boundary-Layer Meteorology, Vol. 126, No. 3, 01.03.2008, p. 349-363.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Intermittent bursting of turbulence in a stable boundary layer with low-level jet
AU - Ohya, Yuji
AU - Nakamura, Reina
AU - Uchida, Takanori
PY - 2008/3/1
Y1 - 2008/3/1
N2 - The atmospheric stable boundary layer (SBL) with a low-level jet is simulated experimentally using a thermally stratified wind tunnel. The turbulence structure and flow characteristics are investigated by simultaneous measurements of velocity and temperature fluctuations and by flow visualization. Attention is focused on the effect of strong wind shear due to a low-level jet on stratified boundary layers with strong stability. Occasional bursting of turbulence in the lower portion of the boundary layer can be found in the SBL with strong stability. This bursting originates aloft away from the surface and transports fluid with relatively low velocity and temperature upward and fluid with relatively high velocity and temperature downward. Furthermore, the relationship between the occurrence of turbulence bursting and the local gradient Richardson number (Ri) is investigated. The Ri becomes larger than the critical Ri, Ricr = 0.25, in quiescent periods. On the other hand, the Ri number becomes smaller than Ricr during bursting events.
AB - The atmospheric stable boundary layer (SBL) with a low-level jet is simulated experimentally using a thermally stratified wind tunnel. The turbulence structure and flow characteristics are investigated by simultaneous measurements of velocity and temperature fluctuations and by flow visualization. Attention is focused on the effect of strong wind shear due to a low-level jet on stratified boundary layers with strong stability. Occasional bursting of turbulence in the lower portion of the boundary layer can be found in the SBL with strong stability. This bursting originates aloft away from the surface and transports fluid with relatively low velocity and temperature upward and fluid with relatively high velocity and temperature downward. Furthermore, the relationship between the occurrence of turbulence bursting and the local gradient Richardson number (Ri) is investigated. The Ri becomes larger than the critical Ri, Ricr = 0.25, in quiescent periods. On the other hand, the Ri number becomes smaller than Ricr during bursting events.
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U2 - 10.1007/s10546-007-9245-y
DO - 10.1007/s10546-007-9245-y
M3 - Article
AN - SCOPUS:38649124009
VL - 126
SP - 349
EP - 363
JO - Boundary-Layer Meteorology
JF - Boundary-Layer Meteorology
SN - 0006-8314
IS - 3
ER -